CN114744074A

CN114744074A - Back contact battery string, preparation method thereof, battery assembly and production equipment

Info

Publication number: CN114744074A
Application number: CN202210207812.8A
Authority: CN
Inventors: 王永谦; 张宁; 许文理; 陈刚
Original assignee: Zhejiang Aiko Solar Energy Technology Co Ltd; Guangdong Aiko Technology Co Ltd; Tianjin Aiko Solar Energy Technology Co Ltd; Zhuhai Fushan Aixu Solar Energy Technology Co Ltd
Current assignee: Zhejiang Aiko Solar Energy Technology Co Ltd; Guangdong Aiko Technology Co Ltd; Tianjin Aiko Solar Energy Technology Co Ltd; Zhuhai Fushan Aixu Solar Energy Technology Co Ltd
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-07-12
Anticipated expiration: 2042-03-03
Also published as: CN114744074B

Abstract

The application is applicable to the technical field of solar cells, and provides a back contact cell string, a preparation method thereof, a cell module and production equipment. The preparation method of the back contact battery string comprises the following steps: arranging a plurality of back contact cells by using a sheet swinging mechanism; moving the arranged back contact batteries to a loading station together, wherein the back surfaces of the back contact batteries deviate from a bearing platform of the loading station; placing a plurality of solder strips on a plurality of back contact cells at the same time at a loading station; placing a pressing tool on a plurality of back contact batteries on which a plurality of welding strips are placed at a feeding station; moving the back contact batteries on which the pressing tool and the welding strips are placed to a welding station together; welding a plurality of solder ribbons with a plurality of back contact cells at a welding station; and moving the welded back contact batteries to a stringing-out station together. Therefore, the whole string of back contact battery strings can be placed and moved, and the production efficiency of the back contact battery strings is improved.

Description

Back contact battery string, preparation method thereof, battery assembly and production equipment

Technical Field

The application belongs to the technical field of solar cells, and particularly relates to a back contact cell string, a preparation method of the back contact cell string, a cell module and production equipment.

Background

The solar cell can convert sunlight into electric energy by utilizing the photovoltaic effect of a semiconductor p-n junction, and the solar energy is sustainable clean energy.

The related art generally connects two adjacent solar cells using solder ribbons to form a cell string, and then packages the cell string into a cell module. Therefore, the service life of the solar cell can be prolonged, and the reliability of the solar cell can be improved. However, the related art has low efficiency in manufacturing the battery string.

Therefore, how to improve the preparation efficiency of the back contact battery string becomes a problem to be solved urgently.

Disclosure of Invention

The application provides a back contact battery string, a preparation method thereof, a battery assembly and production equipment, and aims to solve the problem of how to improve the preparation efficiency of the back contact battery string.

The preparation method of the back contact battery string comprises the following steps:

arranging a plurality of back contact cells by using a sheet swinging mechanism;

moving the arranged back contact batteries to a feeding station together, wherein the back surfaces of the back contact batteries deviate from a bearing platform of the feeding station;

collectively placing a plurality of solder strips on a plurality of back contact cells at the loading station;

placing a press on the plurality of back contact cells on which the plurality of solder ribbons are placed at the feeding station;

collectively moving the plurality of back contact batteries on which the pressing tool and the plurality of solder strips are placed to a welding station;

welding a plurality of the solder ribbons with a plurality of the back contact cells at the welding station;

and moving the welded back contact batteries to a stringing-out station together.

The back contact battery string of the embodiment of the application is prepared by any one of the preparation methods of the back contact battery string.

The production equipment comprises a sheet swinging mechanism, a mechanical arm, a bearing platform and a welder, wherein the sheet swinging mechanism is used for arranging a plurality of back contact batteries; the manipulator is used for moving the arranged back contact batteries to a feeding station together, and the back surfaces of the back contact batteries deviate from a bearing platform of the feeding station; the manipulator is used for placing a plurality of welding strips on the back contact batteries together at the feeding station; the manipulator is used for placing a pressing tool on the back contact batteries on which the solder strips are placed at the feeding station; the bearing platform is used for moving the back contact batteries on which the pressing tool and the welding strips are placed to a welding station together; the welder is used for welding a plurality of welding strips with a plurality of back contact batteries at the welding station; the bearing platform is used for moving the welded back contact batteries to a serial station together.

In the back contact battery string, the preparation method thereof, the battery pack and the production equipment, the plurality of back contact batteries are moved together, the plurality of welding strips are placed together, and the plurality of back contact batteries on which the pressing tool and the plurality of welding strips are placed are moved together, so that the production efficiency of the back contact battery string can be improved.

Drawings

Fig. 1, 5, 8, 10, 12, 14 and 20 are schematic flow charts of methods of making back contact battery strings according to various embodiments of the present application;

fig. 2 is a schematic structural diagram of a back contact battery string manufactured by a method for manufacturing a back contact battery string according to an embodiment of the present application;

fig. 3, 4, 6, 7, 9, 11, 13, 15-19, and 21-24 are schematic views of a method for manufacturing a back contact battery string according to an embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Referring to fig. 1, 2 and 3, a method for manufacturing a back contact battery string 100 according to an embodiment of the present disclosure includes:

step S22: arranging a plurality of back contact cells 20 using a sheet swinging mechanism;

step S24: moving the arranged back contact batteries 20 to a feeding station together, wherein the back surfaces of the back contact batteries 20 are deviated from the bearing platform 102 of the feeding station;

step S26: collectively placing a plurality of solder strips 10 on a plurality of back contact cells 20 at a loading station;

step S27: placing a press 40 on the plurality of back contact cells 20 on which the plurality of solder ribbons 10 are placed at a loading station;

step S28: collectively moving the plurality of back contact batteries 20 on which the presser 40 and the plurality of solder ribbons 10 are placed to a soldering station;

step S30: welding a plurality of solder ribbons 10 to a plurality of back contact cells 20 at a welding station;

step S31: the plurality of back contact batteries 20 after welding are collectively moved to the stringing station.

In the method for manufacturing the back contact battery string 100 according to the embodiment of the present invention, the plurality of back contact batteries 20 are collectively moved, the plurality of solder ribbons 10 are collectively placed, and the plurality of back contact batteries 20 on which the presser 40 and the plurality of solder ribbons 10 are placed are collectively moved, so that the production efficiency of the back contact battery string 100 can be improved.

Moreover, the relative positions of the solder strips 10 are fixed during the placement and movement process, so that the high-precision alignment of the solder strips 10 to the back contact battery 20 is ensured.

Note that the solder ribbons 10 are soldered to the main grid of the back contact cells 20.

It is to be understood that "plurality" may refer to all, or a desired portion, of the entire string of battery strings.

Preferably, step S22 includes: arranging all back contact cells 20 required for the entire string of cells using a sheet placement mechanism; step S24 includes: moving all back contact batteries 20 required by the arranged whole string of battery strings to a feeding station; step S26 includes: placing all welding strips 10 required by the whole battery string on a plurality of back contact batteries 20 at a feeding station; step S28 includes: moving all back contact cells 20 of all solder strips 10 required for placing the presser 40 and the entire string of cells to a soldering station; step S30 includes: welding all welding strips 10 required by the whole string of battery strings with all back contact batteries 20 required by the whole string of battery strings at a welding station; step S31 includes: all back contact cells 20 required for the entire welded string are moved together to the string exit station.

Thus, all of the back contact cells 20 required for the entire string of the battery string can be placed at once, all of the bonding tapes 10 required for the entire string of the battery string can be placed at once, all of the holding jigs 40 required for the entire string of the battery string can be placed at once, all of the portions to be bonded required for the entire string of the battery string can be bonded at once, and the bonding efficiency can be improved to the maximum. In addition, in the placing process, the relative positions of all the solder strips 10 required by the whole battery string are fixed, so that the high-precision alignment of the solder strips 10 to the back contact battery 20 is ensured.

In other embodiments, step S22 may include: arranging a portion of the back contact cells 20 using a wobble mechanism; step S24 may include: moving the arranged partial back contact batteries 20 to a feeding station; step S26 may include: collectively placing portions of the solder strips 10 onto a plurality of back contact cells 20 at a loading station; step S28 includes: moving all back contact batteries 20 with the pressing tool 40 and part of the welding strip 10 placed to the welding station; step S30 includes: welding a part of the welding strip 10 and a part of the back contact batteries 20 of the whole battery string at a welding station; step S31 includes: the welded partial back contact cells 20 are collectively moved to the stringing station. Thus, the back contact battery 20 can be placed partially at a time, the bonding tape 10 can be placed partially at a time, the pressing tool 40 can be placed partially at a time, and the portion to be welded can be welded at a time, thereby improving the welding efficiency to a large extent. Moreover, the relative position of the partial solder strips 10 is fixed in the placing process, so that the high-precision alignment of the partial solder strips 10 to the back contact battery 20 is ensured.

Specifically, in step S22, the plurality of back contact batteries 20 may be arranged on the supporting platform 102 by the swinging piece mechanism; alternatively, the plurality of back contact cells 20 may be arranged first, and then the arranged plurality of back contact cells 20 may be placed on the supporting platform 102.

Referring to fig. 2, fig. 3 and fig. 4, alternatively, in step S22, the plurality of back contact cells 20 are arranged by using a swinging piece mechanism, so that the polarities of the corresponding electrodes of two adjacent back contact cells 20 are opposite in the connection direction of the solder strip 10. That is, the polarities of the main gates corresponding to the adjacent two back contact cells 20 are opposite.

It is understood that in the following embodiments shown in fig. 17, 18 and 19, a plurality of back contact cells 20 may be arranged by using a wobble mechanism, so that the polarities of the corresponding electrodes of two adjacent back contact cells 20 are the same in the connection direction of the solder strip 10.

Note that, herein, the scene before fig. 17 corresponds to the back contact battery string 100 shown in fig. 2, and the scene after fig. 17 corresponds to the back contact battery string 100 shown in fig. 17. For convenience of description, the preparation method will be described with reference to a scene diagram by taking the back contact battery string 100 shown in fig. 2 as an example, and then the difference between the preparation method of the back contact battery string 100 shown in fig. 17 and the preparation method of the back contact battery string 100 shown in fig. 2 will be described. To avoid redundancy, the same points of the two methods of manufacturing the back contact battery string 100 are omitted or simply described after fig. 17. It will be appreciated that the same may be referred to one another.

Specifically, the joining direction of the solder ribbon 10 refers to the longitudinal direction of the solder ribbon 10. It is understood that the solder strip 10 connects two adjacent back contact cells 20 along the length direction of the solder strip 10, and the plurality of back contact cells 20 are arranged in sequence along the length direction of the solder strip 10.

Further, the number of back contact cells 20 in a string of cell strings 100 is 2-20. For example 2, 3, 4, 5, 10, 15, 20.

Further, in the example of fig. 2 and fig. 17 hereinafter, the number of the back contact cells 20 in the cell string 100 is 4, and the 4 back contact cells 20 are arranged in order along the length direction of the solder ribbon 10.

Alternatively, before step S24, the robot may be used to correct the positions of the back contact batteries 20 and then collectively place the back contact batteries 20 on the supporting platform 102. So, rectify the position earlier, whole cluster transport again is favorable to improving positioning accuracy and production efficiency.

Referring to fig. 3 and 18, optionally, in step S24, a plurality of back contact batteries 20 are placed on the supporting platform 102 with their back surfaces facing upward. In this manner, having the back side of the back contact cell 20 facing away from the carrier platform 102 facilitates placement of the solder ribbon 10 on the electrode on the back side of the back contact cell 20.

Alternatively, a robot may be used to collectively place the plurality of arranged back contact cells 20 on the carrier platform 102 by vacuum suction. In other words, the robot includes a vacuum chuck that places a plurality of aligned back contact cells 20 onto the load platform 102. As such, the risk of damage and breakage of the back contact cell 20 can be reduced by vacuum adsorption.

Alternatively, the vacuum suction structure of the carrier platform 102 may be utilized to fix the position of the back contact battery 20 on the carrier platform 102. In other words, the load-bearing platform 102 may include vacuum chucking holes. After the plurality of back contact batteries 20 are placed on the supporting platform 102, the vacuum suction holes are opened to suck the plurality of back contact batteries 20 on the supporting platform 102. Therefore, the positions of the back contact batteries 20 fixed on the bearing platform 102 through vacuum adsorption are prevented from moving relatively, and the welding precision is improved.

Further, after step S31, the vacuum suction holes may be closed, and the back contact battery string 100 may be removed from the loading platform 102 by a robot. Further, the back contact battery string 100 may be transported from the carrier platform 102 to a back contact battery string typesetter, such that the back contact battery string typesetter typesets the plurality of back contact battery strings 100, which are then transported to a laminator to form the battery assembly.

Optionally, a scratch-resistant member may be provided at the interface of the load-bearing platform 102 and the back contact battery 20. The scratch-proof member is made of teflon tape or other high-temperature-resistant smooth materials. In this way, the front side of the back contact cell 20 may be prevented from being scratched by the load-bearing platform 102.

Referring to fig. 4, the electrode of the back contact cell 20 includes a plurality of first main grids and a plurality of second main grids, the polarities of the first main grids and the second main grids are opposite, and the plurality of first main grids and the plurality of second main grids are alternately arranged along the width direction of the solder strip 10. That is, in the width direction of the solder strip 10, one second main grid is arranged between two adjacent first main grids, and one first main grid is arranged between two adjacent second main grids. Each first main grid is provided with a plurality of first welding spots 21 which are sequentially arranged along the extending direction of the first main grid; each of the second main gates is provided with a plurality of second pads 22 sequentially arranged along the extending direction of the second main gate.

It can be understood that for two adjacent back contact cells 20, one solder strip 10 connects one column of first solder points 21 of one of the back contact cells 20 and one column of second solder points 22 of the other back contact cell 20. In this manner, one solder strip 10 connects one first main grid of one of the back-contact cells 20 and one second main grid of the other back-contact cell 20.

Further, each of the first main gates has an even number of first pads 21, and each of the second main gates has an even number of second pads 22.

Specifically, in the example of fig. 4, the back surface of the back contact cell 20 sheet is provided with 10 main grids, wherein 5 positive main grids and 5 negative main grids. It is understood that the number of main gates may be other values in other embodiments.

Alternatively, an insulating member may be provided at both sides of the main grid back contacting the back surface of the cell 20. Thus, the solder ribbon 10 is prevented from contacting the opposite electrode to form a short circuit. In particular, the insulating member may have a strip shape, parallel to the main grid. Further, an insulating paste may be printed on both sides of the main grid at the back of the back contact cell 20, and dried to solidify the insulating paste into an insulating member. So, make setting up of insulating cement more accurate.

Alternatively, a conductive member may be provided on the main grid back-contacting the back surface of the battery 20, and the conductive member may be melted by heating. The conductive member is, for example, solder paste. In this way, the main grid is soldered to the solder ribbon 10 by the solder paste.

Alternatively, the weld bead 10 may be a flat weld bead 10. It is understood that in other embodiments, the solder strip 10 may also be a circular solder strip 10.

Specifically, in step S27, one presser 40 may be placed on the plurality of back contact batteries 20 on which the plurality of solder ribbons 10 are placed, or the plurality of pressers 40 may be placed on the plurality of back contact batteries 20 on which the plurality of solder ribbons 10 are placed collectively. In the case where a plurality of the hold-downs 40 are collectively placed on a plurality of the back contact cells 20 on which a plurality of the solder ribbons 10 are placed, all the hold-downs 40 necessary for the entire string of the cells can be collectively placed on a plurality of the back contact cells 20 on which a plurality of the solder ribbons 10 are placed. Therefore, the production efficiency can be improved to the maximum extent.

Specifically, in step S27, the pressing tool 40 may be provided with a plurality of pressing pins, each corresponding to one welding point of the back contact battery 20. Therefore, the pressure intensity of the welding area can be increased through the pressing pin, and the welding effect is better.

Further, the surface of the pressing pin may be covered with an aluminum oxide layer. Thus, insulation may be provided by an alumina layer. Further, the press pin may be an aluminum pin. In this way, the surface of the pressing pin can be covered with an alumina layer by oxidation.

Specifically, in step S27, the number of beams of the hold-down 40 may be the same as the number of welding points of each main grid of the back contact cell 20.

Specifically, the hold-down device 40 includes a plurality of beams, each extending in a direction perpendicular to the length direction of the solder ribbon 10. Therefore, the pressing tool 40 has better effect of pressing the welding strip 10 and the back contact battery 20, and is beneficial to improving the welding precision.

Further, in a state where the presser 40 presses the back contact cell 20 on which the solder ribbon 10 is placed, the solder of the back contact cell 20 is exposed from the gap between the adjacent two beams. Thus, the welding is facilitated, and the presser 40 is prevented from interfering with the welding.

Specifically, in step S30, the plurality of solder ribbons 10 may be heated by at least one of infrared heating, electromagnetic heating, hot air heating, and laser heating to connect the solder ribbons 10 with the plurality of back contact batteries 20. In other words, the welding may be performed using the heater 104, and the heater 104 may operate based on at least one of infrared heating, electromagnetic heating, hot air heating, and laser heating.

Further, in the present embodiment, the heater 104 includes an infrared lamp box, and an infrared welding lamp tube is disposed in the infrared lamp box. In step S30, the infrared lamp box is pressed down a preset distance toward the solder ribbon 10 and the back contact battery 20 to heat the solder ribbon 10, thereby welding the solder ribbon 10 and the back contact battery 20.

It is understood that in other embodiments, the heater 104 may include an electromagnetic heater, a heat gun, a laser heater.

Referring to fig. 5, 6 and 7, optionally, step S26 includes:

step S261: the plurality of solder ribbons 10 to be connected are placed on the electrodes of the plurality of back contact cells 20 using the first clamping portion 31, the second clamping portion 32, and the third clamping portion 33 of the robot arm, the first clamping portion 31, the second clamping portion 32, and the third clamping portion 33 corresponding to the head ends, the tail ends, and the middle portions of the plurality of solder ribbons 10, respectively.

In this way, the head ends, tail ends, and intermediate portions of the plurality of solder strips 10 can be collectively clamped, conveyed, and soldered, so that the accuracy and production efficiency of soldering can be improved, and the production cost can be reduced. In addition, the welding precision is improved, so that the anisotropic fine grid can be designed to be closer to the main grid without causing short circuit, the fine grid can collect current in more areas, the battery efficiency is improved, and the assembly efficiency is improved.

Preferably, the plurality of solder ribbons 10 to be connected are simultaneously placed on the electrodes of the plurality of back contact cells 20 using the first clamping portion 31, the second clamping portion 32, and the third clamping portion 33. Thus, the solder strips 10 are placed simultaneously, which is beneficial to improving the production efficiency. Moreover, in the placing process, the relative positions of the solder strips 10 are fixed, so that the high-precision alignment of the solder strips 10 to the back contact battery 20 is ensured.

More preferably, all of the solder ribbons 10 required for the entire string of cells are simultaneously placed on the electrodes of the plurality of back contact cells 20 using the first, second, and

third clamping portions

31, 32, and 33.

Thus, all the solder strips 10 required by the whole string of battery strings can be placed at the same time, and the production efficiency can be improved to the maximum extent. In addition, in the placing process, the relative positions of all the solder strips 10 required by the whole battery string are fixed, so that the high-precision alignment of the solder strips 10 to the back contact battery 20 is ensured.

Specifically, according to the preparation method of the back contact battery string 100 in the embodiment of the application, the welding precision of the central line of the solder strip 10 and the central point of the main grid of the back contact battery 20 reaches ± 0.2 mm. That is, in the battery string 100 manufactured by the manufacturing method according to the embodiment of the present application, the offset between the center line of the solder ribbon 10 and the center point of the main grid of the back contact battery 20 is less than 0.2 mm.

Specifically, referring to fig. 6 and 7, the solder strip 10 includes a plurality of first solder strips 11 and a plurality of second solder strips 12; the first clamping part 31 comprises a plurality of first clamping jaws 311 and a plurality of second clamping jaws 312, the first clamping jaws 311 and the second clamping jaws 312 are arranged in a staggered mode, the first clamping jaws 311 clamp the head end of the first welding strip 11, and the second clamping jaws 312 clamp the head end of the second welding strip 12; the second clamping portion 32 includes a plurality of third clamping jaws 321 and a plurality of fourth clamping jaws 322, the third clamping jaws 321 and the fourth clamping jaws 322 are staggered, the third clamping jaws 321 clamp the tail end of the first solder strip 11, and the fourth clamping jaws 322 clamp the tail end of the second solder strip 12.

Further, the plurality of first solder strips 11 and the plurality of second solder strips 12 are staggered in the width direction of the solder strip 10. That is, one second weld bead 12 is provided between two adjacent first weld beads 11, and one first weld bead 11 is provided between two adjacent second weld beads 12 in the width direction of the weld bead 10. In this way, the first solder strips 11 and the second solder strips 12 correspond to the first main grid and the second main grid of the back contact battery 20, respectively, and the occurrence of dislocation is avoided.

Further, the first clamping jaws 311 and the second clamping jaws 312 are staggered in the width direction of the solder strip 10, which means that one second clamping jaw 312 is arranged between two adjacent first clamping jaws 311 and one first clamping jaw 311 is arranged between two adjacent second clamping jaws 312 in the width direction of the solder strip 10. Thus, the first clamping jaw 311 and the second clamping jaw 312 correspond to the first welding strip 11 and the second welding strip 12 respectively, and dislocation is avoided.

Further, the first clamping jaw 311 and the second clamping jaw 312 are flush in the thickness direction of the solder ribbon 10. Therefore, the first clamping jaw 311 and the second clamping jaw 312 can be lifted and clamped synchronously, and the clamping efficiency can be improved.

Further, the head ends of the first and second solder strips 11 and 12 are offset in the longitudinal direction of the solder strip 10. Thus, welding to the bus bar is facilitated.

Further, the first clamping jaw 311 and the second clamping jaw 312 are displaced in the length direction of the solder ribbon 10. Thus, the first clamping jaw 311 and the second clamping jaw 312 are adapted to the dislocation of the head ends of the first welding strip 11 and the second welding strip 12 in the length direction of the welding strip 10, and the head ends of the corresponding welding strips 10 are clamped by the first clamping jaw 311 and the second clamping jaw 312. Meanwhile, a movable space can be provided for the first clamping jaw 311 and the second clamping jaw 312, and mutual interference between the first clamping jaw 311 and the second clamping jaw 312 during synchronous lifting and clamping is avoided. It will be appreciated that the first jaw 311 and the second jaw 312 may also be flush along the length of the weld bead 10. That is, a line connecting the center of the first clamping jaw 311 and the center of the second clamping jaw 312 is perpendicular to the longitudinal direction of the solder ribbon 10.

Please note that the third jaws 321 and the fourth jaws 322 of the second clamping portion 32 are similar to the first jaws 311 and the second jaws 312 of the first clamping portion 31, and the explanation and the description can refer to the foregoing, and are not repeated herein for avoiding redundancy.

Specifically, referring to fig. 6 and 7, the third clamping portion 33 corresponds to the middle portions of the plurality of solder strips 10. Thus, the middle part of the solder strip 10 can be clamped, the middle part collapse caused by only clamping the head end and the tail end of the solder strip 10 is avoided, and the solder strip 10 is prevented from being broken in the clamping or transporting process. Meanwhile, the degree of freedom of the middle portion of the solder strip 10 in the width direction of the solder strip 10 is reduced, which is beneficial to improving the positioning accuracy of the solder strip 10, thereby improving the welding accuracy.

Referring to fig. 7, optionally, a gap is formed between two adjacent back contact cells 20, the number of the third clamping portions 33 is multiple, and each third clamping portion 33 corresponds to one gap. In this way, the clamping of the correspondingly cut solder strip 10 at the gap is facilitated. Like this for even if cut at the space department and also can not drop from third clamping part 33, avoid carrying out the repeated clamp to taking to solder strip 10, be favorable to improving production efficiency. At the same time, this prevents the solder strip 10 from being displaced in the third clamping portion 33 even if it is cut off at the gap, which is advantageous in ensuring the positioning accuracy of the solder strip 10.

Specifically, referring to fig. 7, the third clamping portions 33 corresponding to two adjacent gaps clamp the first solder strip 11 and the second solder strip 12, respectively. Therefore, the part clamped by the third clamping part 33 corresponds to the part of the welding strip 10 which needs to be cut off, so that the cutting of the welding strip 10 is convenient to position, and the production efficiency is improved. Meanwhile, the correspondingly cut solder strip 10 at the gap can be ensured to be clamped by the third clamping part 33, so that the solder strip 10 at the cut part is prevented from dropping or generating displacement.

In the example of fig. 7, in the direction from the first nip 31 to the second nip 32, 4 back contact cells 20 form 3 voids, which are a first void, a second void, and a third void, respectively; the third clamping portion 33 corresponding to the first gap clamps the second solder strip 12 cut off at the first gap, the third clamping portion 33 corresponding to the second gap clamps the first solder strip 11 cut off at the second gap, and the third clamping portion 33 corresponding to the third gap clamps the second solder strip 12 cut off at the third gap.

It is understood that in other embodiments, the third clamping portion 33 can clamp the first solder strip 11 and the second solder strip 12. Thus, even if the solder ribbon 10 does not need to be cut off at the gap, the third clamping portion 33 clamps it. In this way, the solder ribbon 10, which does not need to be cut at the gap, is prevented from collapsing due to an excessively long length, thereby preventing the solder ribbon 10 from being broken. Meanwhile, the degree of freedom of the solder strip 10 in the width direction of the solder strip 10, which does not need to be cut at the gap, is reduced, which is beneficial to improving the positioning accuracy of the solder strip 10, thereby improving the welding accuracy.

Referring to fig. 7, optionally, the distance S1 between two adjacent third clamping portions 33 is greater than the width w of the back contact cell 20.

Note that the distance S1 between the adjacent two third clamping portions 33 is the distance between the center points of the adjacent two third clamping portions 33 in the longitudinal direction of the solder ribbon 10.

In this way, in the case that each third clamping portion 33 corresponds to one gap, the distance S1 between two adjacent third clamping portions 33 is ensured to be large enough, so that the range of the back contact battery 20 shielded by the third clamping portions 33 is ensured to be small, and the third clamping portions 33 can be prevented from interfering with the welding of the solder strip 10 and the back contact battery 20. In addition, a space can be reserved for placing the pressing tool 40, so as to avoid the interference between the third clamping part 33 and the pressing tool 40. It is understood that the first clamping portion 31, the second clamping portion 32 and the third clamping portion 33 may also be withdrawn from the back contact cell 20 after the placement of the hold-down 40 and before the soldering.

Specifically, the distance S1 between the adjacent two third clamping portions 33 is equal to the sum of the width w of the back contact cell 20 and the width d of the void.

Therefore, the distance S1 between two adjacent third clamping parts 33 is fixed, the length of the solder strip 10 between two adjacent third clamping parts 33 is fixed, the solder strip 10 is positioned every other preset length, and the welding precision is improved.

Specifically, the projection of the center of the third clamping portion 33 on the bearing platform 102 is located on the projection of the center line of the gap on the bearing platform 102. So, be convenient for carry out accurate location to third clamping part 33 through the space to carry out accurate location to welding the area 10. Moreover, the third clamping portion 33 can be located in the center of the gap, so that the shielding range of the third clamping portion 33 for the two side back contact cells 20 is close, and the third clamping portion 33 can avoid shielding the one side back contact cell 20 more, so as to avoid the third clamping portion 33 interfering with the welding of the welding strip 10 and the side back contact cell 20.

Referring to fig. 7, optionally, the distance s2 between the first clamping portion 31 and the adjacent third clamping portion 33 is greater than the width w of the back contact cell 20.

Note that the distance s2 between the first clamping portion 31 and the adjacent third clamping portion 33 is the distance between the center point of the jaw of the first clamping portion 31 away from the third clamping portion 33 and the center point of the third clamping portion 33 in the longitudinal direction of the solder strip 10.

For example, in the example of fig. 7, the second clamping jaw 312 is the clamping jaw of the first clamping portion 31 far from the third clamping portion 33, and the distance s2 between the first clamping portion 31 and the adjacent third clamping portion 33 is the distance between the center point of the second clamping jaw 312 and the center point of the third clamping portion 33 in the length direction of the solder ribbon 10.

In this way, in the case where each third clamping portion 33 corresponds to one gap, the distance s2 between the first clamping portion 31 and the adjacent third clamping portion 33 is ensured to be large enough, so that the range in which the back contact cell 20 is exposed between the first clamping portion 31 and the third clamping portion 33 is ensured to be large, and the first clamping portion 31 and the third clamping portion 33 can be prevented from interfering with the welding of the solder strip 10 and the back contact cell 20. In addition, a space can be reserved for placing the pressing tool 40, so as to avoid the interference between the third clamping part 33 and the pressing tool 40. It is understood that the first clamping portion 31, the second clamping portion 32 and the third clamping portion 33 may also be withdrawn from the back contact cell 20 after the placement of the hold-down 40 and before the soldering.

Specifically, the distance s2 between the first clamping portion 31 and the adjacent third clamping portion 33 is equal to the sum of the width w of the back contact cell 20 and the width d of the void.

In this way, the distance s2 between the first clamping portion 31 and the adjacent third clamping portion 33 is fixed, so that the length of the solder strip 10 between the first clamping portion 31 and the adjacent third clamping portion 33 is fixed, the solder strip 10 is positioned every predetermined length, and the welding precision is improved.

Specifically, the projection of the center of the third clamping portion 33 on the carrying platform 102 is located on the projection of the center line of the gap on the carrying platform 102, and the projection of the center of the first clamping portion 31 on the carrying platform 102 is located outside the projection of the back contact battery 20 on the carrying platform 102.

In this way, it is convenient to accurately position the third clamping portion 33 adjacent to the first clamping portion 31 through the gap, thereby accurately positioning the solder strip 10. Moreover, the third clamping portion 33 can be located in the center of the gap, so that the shielding range of the third clamping portion 33 for the two side back contact cells 20 is close, and the third clamping portion 33 can avoid shielding the one side back contact cell 20 more, so as to avoid the third clamping portion 33 interfering with the welding of the welding strip 10 and the side back contact cell 20. At the same time, this may allow the first clamping portion 31 to shield less or even not the back contact cell 20, thereby avoiding the first clamping portion 31 from interfering with the welding of the solder strip 10 and the back contact cell 20.

Referring to fig. 7, optionally, the distance s3 between the second clamping portion 32 and the adjacent third clamping portion 33 is greater than the width w of the back contact cell 20. Specifically, the distance s3 between the second clamping portion 32 and the adjacent third clamping portion 33 is equal to the sum of the width w of the back contact cell 20 and the width d of the void.

Please note that, the distance s3 between the second clamping portion 32 and the adjacent third clamping portion 33 is similar to the distance s2 between the first clamping portion 31 and the adjacent third clamping portion 33, and the explanation and the description can refer to the foregoing, and the description is omitted here for avoiding redundancy.

Referring to fig. 7, 8 and 9, optionally, the solder strip 10 includes a plurality of first solder strips 11 and a plurality of second solder strips 12; of the two adjacent third clamping portions 33, one third clamping portion 33 clamps the first solder strip 11, and the other third clamping portion 33 clamps the second solder strip 12; before step S30, the preparation method further includes:

step S291: the clamped portions of the plurality of first solder strips 11 and the plurality of second solder strips 12 are cut by the cut piece of the third clamping portion 33.

So, respectively the first strip 11 and the second strip 12 of welding of centre gripping, weld and all cut by the clamping part of taking 10, can be through the centre gripping for cutting the location for cut more accurately.

It will be appreciated that fig. 9 and 7 represent variations of the solder strip 10 before and after it is cut.

Specifically, the first solder strip 11 and the second solder strip 12 may be cut simultaneously; or the first welding strip 11 can be cut first, and then the second welding strip 12 can be cut; or the second welding strip 12 can be cut first, and then the first welding strip 11 can be cut; the first solder strips 11 and the second solder strips 12 can also be cut alternately.

Specifically, the plurality of first solder strips 11 may be cut simultaneously, may be cut in sequence, or may be cut in batches. Similarly, the plurality of second solder strips 12 may be cut simultaneously, sequentially, or in batches.

Preferably, step S161 includes: the clamped portions of the plurality of first solder strips 11 and the plurality of second solder strips 12 are simultaneously cut by the cut piece of the third clamping portion 33. Thus, the welding strip 10 is cut at the same time, which is beneficial to improving the welding efficiency.

More preferably, the clamped portions of all the first solder ribbons 11 and all the second solder ribbons 12 required for the entire string of the battery can be simultaneously cut using the cut piece of the third clamping portion 33.

Therefore, the welding strips 10 can be cut in a whole string, and the welding efficiency is improved. In addition, in the cutting process, the solder strip 10 is always fixed by the first clamping part 31, the second clamping part 32 and the third clamping part 33, and high-precision alignment of the solder strip 10 to the back contact battery 20 is guaranteed.

Specifically, in the example of fig. 8, step S291 is located between step S28 and step S30.

It is understood that in other embodiments, step S291 may be located between step S27 and step S28; step S291 may also be located between step S261 and step S27; step S291 may also precede step S261. The execution sequence of step S261 is not limited as long as it is before step S30.

It is to be understood that, before step S261, i.e., before placing the plurality of solder ribbons 10 to be connected onto the electrodes of the plurality of back contact cells 20, the preparation method may further include: the plurality of solder ribbons 10 are gripped by the first, second, and

third clamping portions

31, 32, and 33. The clamped portions of the plurality of first solder ribbons 11 and the plurality of second solder ribbons 12 may be cut after the plurality of solder ribbons 10 are gripped by the first clamping portion 31, the second clamping portion 32, and the third clamping portion 33, and the cut plurality of solder ribbons 10 to be connected may be placed on the electrodes of the plurality of back contact batteries 20. Therefore, when cutting, the plurality of welding strips 10 are grabbed and fixed, and displacement caused by cutting is avoided, so that the positioning precision of the welding strips 10 can be improved, and the welding precision is improved. Moreover, the cutting is performed before the solder ribbon 10 is placed on the back contact battery 20, so that adverse effects on the back contact battery 20 during cutting are avoided.

Further, the plurality of solder strips 10 may be grasped by the first, second and

third clamping portions

31, 32 and 33 before step S24, i.e., before the plurality of back contact batteries 20 are placed on the loading platform 102; the plurality of solder strips 10 may also be grasped by the first clamping portion 31, the second clamping portion 32, and the third clamping portion 33 at the same time as step S24; it is also possible to grasp the plurality of solder strips 10 with the first clamping portion 31, the second clamping portion 32, and the third clamping portion 33 after step S24. The specific order of execution is not limited herein.

It is understood that, in other embodiments, the clamped portions of the first solder ribbons 11 and the second solder ribbons 12 may be cut while the first clamping portion 31, the second clamping portion 32, and the third clamping portion 33 are used to grasp the solder ribbons 10, and then the cut solder ribbons 10 to be connected may be placed on the electrodes of the back contact batteries 20. So, can reduce to snatch and long when the interval of cutting, be favorable to improving production efficiency.

Specifically, the clamped portion refers to a portion where the solder ribbon 10 is clamped by the third clamping portion 33. The intersection of the projection of the third clamping portion 33 on the carrying platform 102 and the projection of the solder strip 10 on the carrying platform 102 is the projection of the clamped portion on the carrying platform 102.

In particular, the cut piece may be a blanking piece. In other words, the clamped portions of the plurality of first solder ribbons 11 and the plurality of second solder ribbons 12 can be punched out by the punching piece of the third clamping portion 33. Therefore, the cutting surface formed by blanking is smooth and vertical, and the cut is more beautiful. It is understood that in other embodiments, the cutting member may be a scissors, a blade, a laser cutter, or other devices with cutting function.

Specifically, a piece of the welding strip 10 in the clamped portion of the welding strip 10 may be cut off with a cutter. In this way, a space is left between the two cuts of the cut solder strip 10, thereby avoiding short circuit.

Further, the ratio of the length of the cut-off section of the solder strip 10 to the length of the clamped portion is 0.5. In this way, the distance between the two cuts of the cut solder strip 10 is fixed, so that the battery string 100 is more beautiful. Moreover, the distance between the two cuts of the cut solder ribbon 10 is quantified, further avoiding short circuits.

It is understood that in other embodiments, the ratio of the length of the cut-off solder strip 10 to the length of the clamped portion may be 0.2, 0.25, 0.4, 0.6 or other values. And are not limited herein.

Further, a projection of a connecting line between the two cuts of the cut solder strip 10 on the carrying platform 102 intersects with a projection of the gap on the carrying platform 102. Therefore, the welding strip 10 corresponding to the gap is ensured to be cut off, and the cut welding strip 10 can be prevented from crossing the gap to contact the back contact battery 20 on the other side of the gap, so that the adverse effect on the back contact battery 20 on the other side of the gap is avoided.

Further, the center point of the distance between the two cuts of the cut solder strip 10 is located on the projection of the bearing platform 102, and the center line of the gap is located on the projection of the bearing platform 102. In this way, the distance from the two cuts of the cut solder strip 10 to the gap is the same, and the battery string 100 is more beautiful. Moreover, the cutting piece is convenient to position when cutting, and the welding efficiency is improved.

Referring to fig. 7, 10 and 11, optionally, the solder strip 10 includes a plurality of first solder strips 11 and a plurality of second solder strips 12, and the third clamping portion 33 clamps the first solder strips 11 and the second solder strips 12; the third clamping portions 33 include cut pieces, the cut pieces of two adjacent third clamping portions 33 respectively correspond to the first solder strips 11 and the second solder strips 12, and before the step S30, the preparation method further includes:

step S292: cutting the clamped parts of the plurality of first welding strips 11 by using the cutting piece corresponding to the first welding strips 11;

step S293: the clamped portions of the plurality of second solder strips 12 are cut by the cut pieces corresponding to the second solder strips 12.

Thus, the first solder fillet 11 and the second solder fillet 12 are clamped together, and the clamped portion of the solder fillet 10 is selectively cut, so that the number of clamped portions of the solder fillet 10 can be increased, the length of the portion of the solder fillet 10 which is not clamped can be reduced, and the portion which is not clamped is prevented from collapsing and easily breaking. Meanwhile, the degree of freedom of the unclamped part of the solder strip 10 in the width direction of the solder strip 10 is reduced, and the positioning precision of the solder strip 10 is improved, so that the welding precision is improved.

It will be appreciated that fig. 11 and 7 represent variations of the solder strip 10 before and after it is cut.

Specifically, the steps S292 and S293 may be performed simultaneously, in other words, the clamped portions of the plurality of second solder strips 12 may be cut by the cut piece corresponding to the second solder strips 12 while the clamped portions of the plurality of first solder strips 11 are cut by the cut piece corresponding to the first solder strips 11. Therefore, the cutting time can be saved, and the welding efficiency can be improved.

It can be understood that the clamped portions of the first welding strips 11 may be cut by the cutting member corresponding to the first welding strips 11, and then the clamped portions of the second welding strips 12 may be cut by the cutting member corresponding to the second welding strips 12; or the clamped parts of the second solder strips 12 can be cut by using the cut parts corresponding to the second solder strips 12, and then the clamped parts of the first solder strips 11 can be cut by using the cut parts corresponding to the first solder strips 11; it is also possible to alternately cut a portion of the clamped portion of the first solder ribbon 11 with a cut corresponding to the first solder ribbon 11 and cut a portion of the clamped portion of the second solder ribbon 12 with a cut corresponding to the second solder ribbon 12.

Specifically, in the example of fig. 10, step S292 and step S293 are located between step S28 and step S30. It is to be understood that the content of the execution sequence related to the steps S292 and S293 can refer to the foregoing, and is not limited herein as long as it is located before the step S30.

Specifically, the clamped portion refers to a portion where the solder ribbon 10 is clamped by the third clamping portion 33. It can be understood that since the third clamping portion 33 clamps the first solder strip 11 and the second solder strip 12, the projection of the third clamping portion 33 on the carrier platform 102 in fig. 11 intersects with the projection of the first solder strip 11 and the second solder strip 12 on the carrier platform 102. And the area cut in fig. 11 is separated from the area not cut by the broken line in fig. 11 and corresponds to the area covered by the third nip portion 33 in fig. 7. That is, regardless of the example of fig. 9 or the example of fig. 11, the area covered by the third nip portion 33 in fig. 7 is a cut area.

Preferably, step S292 includes: simultaneously cutting the clamped parts of the first welding strips 11 by using the cutting pieces corresponding to the first welding strips 11; step S293 includes: the clamped portions of the plurality of second solder strips 12 are simultaneously cut by the cut pieces corresponding to the second solder strips 12. Thus, the welding strip 10 is cut at the same time, which is beneficial to improving the welding efficiency.

More preferably, the clamped portions of all the first welding strips 11 required for the entire string of the batteries can be simultaneously cut by the cutting member corresponding to the first welding strips 11; the clamped portions of all the second solder strips 12 required for the entire string of batteries are simultaneously cut by the cut pieces corresponding to the second solder strips 12.

Thus, the welding strips 10 can be cut in a whole string at the same time, which is beneficial to improving the welding efficiency. In addition, in the cutting process, the solder strip 10 is always fixed by the first clamping part 31, the second clamping part 32 and the third clamping part 33, and high-precision alignment of the solder strip 10 to the back contact battery 20 is guaranteed.

Referring to fig. 12 and 13, optionally, the robot includes a transportation portion disposed between the first clamping portion 31, the second clamping portion 32 and the third clamping portion 33, and before step S26, the preparation method further includes;

step S251: moving the hold-down 40 from the initial position to the raised position using the transport section;

step S252: grabbing the solder strip 10 with the first, second, and

third clamping portions

31, 32, 33;

step S27 includes;

step S271: the presser 40 is moved from the raised position to the depressed position by the transport section so that the presser 40 presses on the back contact battery 20 on which the solder ribbon 10 is placed.

Therefore, before grabbing the solder strip 10, the pressing tool 40 is lifted, so that the pressing tool 40 can be prevented from interfering with grabbing of the solder strip 10. Moreover, after the plurality of solder strips 10 are placed on the electrodes of the plurality of back contact cells 20, the pressing tool 40 is pressed down to press the plurality of back contact cells 20 and the plurality of solder strips 10 together, so that the plurality of back contact cells 20 and the plurality of solder strips 10 do not move during welding, and the welding precision is improved.

Specifically, the initial position refers to a position where the presser 40 is not contacted by the transport portion. The initial position can be on the conveyer belt, and after the tamp 40 is used, the transport portion can place the tamp 40 on the conveyer belt to flow back to the initial position and enter the next round for use.

Specifically, the elevated position refers to a position higher than the initial position. That is, the transport section lifts the plurality of holding-downs 40 from the initial positions. When the hold-down tool 40 is in the raised position, the first clamping portion 31, the second clamping portion 32 and the third clamping portion 33 are not interfered to grab the solder strip 10, and the back contact battery 20 on which the solder strip 10 is placed is also pressed conveniently after the solder strip 10 is placed on the back contact battery 20.

Specifically, the pressed-down position refers to a position where the presser 40 presses the back contact battery 20 on which the solder ribbon 10 is placed.

In particular, the transport portion comprises suction cups and/or clamps. Further, the suction cup comprises a vacuum cup and/or a magnetic cup. So, provide the multiple realization form of transport portion, can select according to the demand of actual production, be favorable to adapting to multiple production scenario.

Specifically, the phrase "the robot includes a transport portion provided between the first clamping portion 31, the second clamping portion 32, and the third clamping portion 33" means that a transport portion is provided between the first clamping portion 31 and the third clamping portion 33 adjacent to the first clamping portion 31 in the length direction of the solder strip 10 for transporting the presser 40 between the first clamping portion 31 and the third clamping portion 33 adjacent to the first clamping portion 31; a transportation part is arranged between the second clamping part 32 and a third clamping part 33 adjacent to the second clamping part 32 and is used for transporting the pressing tool 40 to a position between the second clamping part 32 and the third clamping part 33 adjacent to the second clamping part 32; a transport portion is provided between two adjacent third clamping portions 33 for transporting the presser 40 to between two adjacent third clamping portions 33.

In other words, in the longitudinal direction of the solder strip 10, the pressing tool 40 is provided between the first clamping portion 31 and the third clamping portion 33 adjacent to the first clamping portion 31, and is a first pressing tool; a pressing tool 40 is arranged between the second clamping part 32 and a third clamping part 33 adjacent to the second clamping part 32, and is a second pressing tool; a pressing device 40 is arranged between two adjacent third clamping portions 33, and is a third pressing device.

It is understood that at least two hold-downs 40 of the first hold-down device, the second hold-down device, and the plurality of third hold-down devices may be connected to form a single piece of hold-down device 40. Therefore, one piece of pressing tool 40 can be transported together, and the efficiency and the positioning accuracy of the pressing tool 40 are improved.

Further, the first presser, the second presser and the plurality of third pressers are all connected to form a one-piece presser 40. Thus, the efficiency and the positioning accuracy of the presser 40 can be maximized.

It is understood that in other embodiments, the hold-down device 40 may be disposed at one or more of the following three regions along the length of the solder strip 10. The first region is a region between the first clamping portion 31 and the third clamping portion 33 adjacent to the first clamping portion 31. The second region is a region between the second nip portion 32 and a third nip portion 33 adjacent to the second nip portion 32. The third region is a region between two adjacent third clamping portions 33.

Preferably, step S251 includes: simultaneously moving the plurality of hold-downs 40 from the initial positions to the raised positions using the transport section; step S252 includes: simultaneously grasping the plurality of solder strips 10 with the first, second, and

third clamping portions

31, 32, and 33; step S271 includes: the plurality of pressers 40 are simultaneously moved from the raised position to the depressed position by the transport section so that the pressers 40 simultaneously press on the back contact cells 20 on which the solder ribbons 10 are placed.

So, snatch simultaneously and place a plurality of tamps 40, snatch a plurality of solder strips 10 simultaneously, be favorable to improving welding efficiency. In addition, in the process of placing the pressing tool 40, all the solder strips 10 required by the whole string of battery strings are always clamped by the first clamping part 31, the second clamping part 32 and the third clamping part 33, and the relative positions are always fixed, so that the high-precision alignment of the solder strips 10 to the back contact battery 20 is ensured.

More preferably, all of the hold-downs 40 required for the entire string of batteries can be moved simultaneously from the initial position to the raised position using the transport section; simultaneously grabbing all solder strips 10 required for the whole string of battery strings by using the first clamping part 31, the second clamping part 32 and the third clamping part 33; all the hold-downs 40 required for the entire string of cells are moved simultaneously from the raised position to the depressed position by the transport section so that all the hold-downs 40 required for the entire string of cells are pressed simultaneously against the back contact cell 20 on which the solder ribbon 10 is placed.

So, can snatch simultaneously and place whole required whole tamp 40 of cluster battery cluster, snatch whole required whole solder strips of cluster battery cluster simultaneously, be favorable to improving welding efficiency. Moreover, in the process of placing the pressing tool 40, all the solder strips 10 required by the whole string of battery strings are always clamped by the first clamping part 31, the second clamping part 32 and the third clamping part 33, and the relative positions are always fixed, so that the high-precision alignment of the solder strips 10 to the back contact batteries 20 is ensured.

It is understood that in other embodiments, the first, second, and

third clamping portions

31, 32, 33 may be used to grasp a strip 10, a plurality of strips 10, a length of strip 10, or a plurality of strips 10.

Referring to fig. 4, 14 and 15, optionally, before step S22, the preparation method includes:

step S21: dicing the back contact cell slices to form at least two back contact cells 20;

step S22 includes:

step S221: every other back contact cell 20, one back contact cell 20 is rotated one hundred and eighty degrees by the wobble plate mechanism.

Therefore, the back contact battery piece is divided into a plurality of back contact batteries 20, and the plurality of back contact batteries 20 are arranged by using the piece swinging mechanism, so that the solder strips can be conveniently placed in the subsequent process.

Specifically, in the example of fig. 15, one second main grid is arranged between two adjacent first main grids in the whole area of the back contact cell, and one first main grid is arranged between two adjacent second main grids. Each first main grid is provided with a plurality of first welding spots 21 which are sequentially arranged along the extending direction of the first main grid; each of the second main gates is provided with a plurality of second pads 22 sequentially arranged along the extending direction of the second main gate.

It will be appreciated that the back contact cell sheet of fig. 15 is broken along the dashed line in fig. 15 to provide two back contact cells 20, and that by rotating the second back contact cell 20 one hundred eighty degrees, the two back contact cells 20 can be arranged in the configuration shown in fig. 4. In this way, the arrangement of the plurality of back contact cells 20 is adapted to the corresponding manufacturing method of the back contact cell string 100 shown in fig. 2.

In other embodiments, no rotation may be performed.

Specifically, in the example of fig. 16, in the first region of the back contact cell, one second main grid is arranged between two adjacent first main grids, and one first main grid is arranged between two adjacent second main grids. Each first main grid is provided with a plurality of first welding spots 21 which are sequentially arranged along the extending direction of the first main grid; each of the second main gates is provided with a plurality of second pads 22 sequentially arranged along the extending direction of the second main gate. In a second area of the back contact battery piece, a second main grid is arranged between two adjacent first main grids, and a first main grid is arranged between two adjacent second main grids. Each first main grid is provided with a plurality of first welding spots 21 which are sequentially arranged along the extending direction of the first main grid; each of the second main gates is provided with a plurality of second pads 22 sequentially arranged along the extending direction of the second main gate. However, in the extending direction of the main grid, the polarities of the main grids corresponding to the first area and the second area are opposite.

It will be appreciated that the back contact cell sheet of fig. 16 is broken along the dashed line in fig. 16 to provide two back contact cells 20, which can be arranged in the configuration shown in fig. 4 without rotating the back contact cells 20 one hundred eighty degrees. In this way, the arrangement of the plurality of back contact batteries 20 is adapted to the corresponding manufacturing method of the back contact battery string 100 shown in fig. 2.

From the above, it can be appreciated that whether the scribed back contact cell 20 needs to be rotated depends on the electrode design and the cell string design. For the electrode design of fig. 15 and the cell string design of fig. 2, every other back contact cell 20 is required to rotate one back contact cell 20 one hundred eighty degrees using a wobble plate mechanism; whereas for the electrode design of fig. 16 and the cell string design of fig. 2, every other back contact cell 20 is not required, with one back contact cell 20 rotated one hundred eighty degrees using a wobble plate mechanism.

Note that the foregoing explains and explains the method of manufacturing the battery string shown in fig. 2. Next, a method of manufacturing the battery string shown in fig. 17 is explained and explained. To avoid redundancy, the same points of the two methods of manufacturing the back contact battery string 100 will be omitted or simply described, and the differences will be described in detail. It is to be understood that the same may be referred to one another.

Referring to fig. 17, 18 and 19, it can be appreciated that for the electrode design of fig. 15 and the battery string design of fig. 17, every other back contact cell 20 is not required, and that a wobble plate mechanism is used to rotate one back contact cell 20 one hundred eighty degrees; whereas for the electrode design of fig. 16 and the cell string design of fig. 17, every other back contact cell 20 is required, one back contact cell 20 is rotated one hundred eighty degrees using a wobble plate mechanism.

Referring to fig. 19, 20 and 21, optionally, before step S24, the preparation method includes:

step S23: the insulating strip 50 is placed on the space between the adjacent two back contact cells 20.

Thus, the insulation strip 50 can prevent short circuit, which is beneficial to improving the reliability of the battery string. Meanwhile, the insulating strips 50 can fix the sheet spacing, which is beneficial to improving the welding precision.

Preferably, a plurality of insulating strips 50 are collectively placed on the space between the adjacent two back contact cells 20. Thus, the plurality of insulating strips 50 can be collectively placed, and the welding efficiency can be improved. Moreover, in the placing process, the relative positions of the plurality of insulating strips 50 are fixed, so that high-precision alignment of the insulating strips 50 to the back contact battery 20 is ensured.

More preferably, all of the insulating strips 50 required for the entire string of cells are placed together at the corresponding gap. Thus, all the insulating strips 50 required for the entire string of battery strings can be placed together, and the welding efficiency can be improved to the maximum extent. In addition, in the placing process, the relative positions of all the insulation strips 50 required by the whole string of battery strings are fixed, so that the high-precision alignment of the insulation strips 50 to the back contact batteries 20 is ensured.

Optionally, the insulation strip 50 includes a first adhesive layer, and before step S24, the preparation method includes: the carrier platform 102 is heated to a predetermined temperature to cause the first adhesive layer to adhere the insulating strip 50 and the back contact cells 20.

In this way, the first adhesive layer on the surface of the insulating strip 50 is melted by heat, so that the insulating strip 50 is bonded to the back contact cell 20.

Further, the first adhesive layer is an adhesive film. In this manner, it can be melted by heat to bond the insulating strip 50 to the back contact cell 20.

Further, the preset temperature is 90-100 ℃. For example, 90 deg.C, 92 deg.C, 95 deg.C, 97 deg.C, 99 deg.C, 100 deg.C. In this manner, the insulating strip 50 is secured to the back contact cell 20.

Optionally, the width of the insulating strip 50 is 2mm-8 mm. For example, 2mm, 4mm, 5mm, 7mm, 8 mm. The width of the gap is 0.2mm-1 mm. For example, 0.2mm, 0.3mm, 0.5mm, 0.8mm, 1 mm. Therefore, the width of the insulating strip 50 is larger than the gap, the gap can be covered, the battery string is more attractive, and glare between the gaps is prevented from hurting human eyes.

Preferably, the width of the gap is 0.5mm and the width of the insulating strip 50 is 5 mm.

Optionally, the insulating strip 50 is the same color as the battery assembly. Thus, the assembly is more attractive. Further, the insulating strip 50 is black or white in color.

Optionally, the insulating strip 50 is PET. Thus, PET has moderate mechanical properties, can support the gap between two adjacent back contact cells 20 when welding, laminating or carrying the cell string, and is low in cost.

Alternatively, the insulating strip 50 may be continuous. Thus, insulation is ensured. It is understood that the insulating strip 50 may also be discontinuous. Therefore, materials are saved as much as possible under the condition of ensuring insulation, and the cost is reduced.

Optionally, the insulating strip 50 is rectangular. In this way, the shape of the gap is adapted to avoid interference with the back contact cell 20.

Optionally, the width of the insulating strip 50 is smaller than the distance between two adjacent welding points of two adjacent back contact cells 20. In this way, the insulating strip 50 is prevented from interfering with the welding.

Note that the back contact battery string 100 shown in fig. 2 may also be provided with an insulating strip 50, and the explanation, explanation and illustration refer to the part of the insulating strip 50, and are not repeated herein to avoid redundancy.

Referring to fig. 20 and 21, optionally, one side of the insulating strip 50 is provided with a first adhesive layer, the other side of the insulating strip 50 is provided with a second adhesive layer and a conductive strip 60 in sequence, the width of the conductive strip 60 is smaller than the width of the insulating strip 50, and the insulating strip 50 is placed on the gap between two adjacent back-contact cells 20, including:

a first adhesive layer is placed on adjacent two back contact cells 20.

In this manner, the insulating strip 50 and the back contact cell 20 are connected by the first adhesive layer, and the conductive strip 60 and the insulating strip 50 are connected by the second adhesive layer. Furthermore, the conductive strips 60 are located on the side of the insulating layer facing away from the back contact cell 20, which avoids short circuits. Also, the conductive bars 60 can reduce the mismatch of the on-chip current of the back contact battery 20, and improve the output power of the battery string.

It can be understood that the conductive bars 60 make the flow direction of current in the back contact battery string 100 shown in fig. 17 zigzag. When the electrode arrangement of the back contact cell before slicing is the same as that in fig. 15, the back contact cell 20 after slicing does not need to be rotated by one hundred and eighty degrees, and the adaptability to the shape of the back contact cell can be improved.

Optionally, the conductive strips 60 are each rectangular. In this way, the shape of the gap is adapted to avoid interference with the back contact cell 20.

Optionally, the width of the conductive strip 60 is smaller than the width of the insulating strip 50, and the width of the conductive strip 60 is smaller than the distance between two adjacent welding points of two adjacent back contact batteries 20. In this way, the conductive strip 60 is prevented from interfering with the soldering.

Alternatively, the conductive strip 60 may be a tin-plated copper strip. In other words, the conductive strip 60 includes a copper substrate and a tin layer coated on the copper substrate. Therefore, the conductive effect is better.

Specifically, the thickness of the conductive strip 60 may be 0.05mm-0.15 mm. For example, 0.05mm, 0.07mm, 0.1mm, 0.12mm, 0.14mm, 0.15 mm. In this way, the thickness of the conductive strip 60 is in a suitable range,

it is understood that in other embodiments, the conductive strip 60 may also include an aluminum substrate and a tin layer coated on the aluminum substrate; or, the conductive strip 60 is an aluminum strip; alternatively, the conductive strips 60 are solder strips. The specific form of the conductive strip 60 is not limited herein.

Alternatively, the conductive strip 60, the second adhesive layer and the insulating strip 50 may be joined together by means of heat pressing. Therefore, the insulating strip 50 is connected with the conductive strip 60, the conductive strip 60 can be placed at the same time when the insulating strip 50 is placed, and the production efficiency can be improved.

Referring to fig. 17, for the first back-contact cell 20 in a back-contact cell string 100, the positive electrode bonding strip connected by the positive grid lines is welded to the positive bus bar, and the negative electrode bonding strip connected by the negative grid lines is welded to the conductive strip 60 between the first back-contact cell 20 and the second back-contact cell 20. For the second back contact cell 20 in a string, the positive strap connected by the positive grid lines is soldered to the conductive strap 60 connected by the negative strap of the first back contact cell 20, and the negative strap connected by the negative grid lines is soldered to the conductive strap 60 between the second back contact cell 20 and the third back contact cell 20. Thus, welding of a whole string of battery strings is completed. It is to be understood that in the example of fig. 17, the flow direction of the current is zigzag; whereas in the example of fig. 2 the flow direction of the current is I-shaped.

Alternatively, referring to fig. 19, in step S22, the plurality of back contact cells 20 are arranged by using a swinging piece mechanism, so that the polarities of the corresponding electrodes of two adjacent back contact cells 20 are the same in the connection direction of the solder ribbon 10. That is, the polarities of the main gates corresponding to the adjacent two back contact cells 20 are the same. In this way, the arrangement of the back contact cells 20 is adapted to the back contact cell string of fig. 17.

Alternatively, referring to fig. 20, step S23 is located between step S22 and step S24. In other words, the plurality of back contact cells 20 are arranged, the insulating strip 50 is placed, and the arranged plurality of back contact cells 20 are moved to the loading platform 102 of the loading station. Thus, in the process of carrying a plurality of back contact batteries 20, the insulating strips 50 support the sheet spacing, which is beneficial to reducing the relative movement of the plurality of back contact batteries 20, thereby improving the production precision.

It is understood that, in other embodiments, the step S23 can be located between the step S24 and the step S26. In other words, the arranged back contact batteries 20 are moved to the loading platform 102 of the loading station, the insulating strip 50 is placed, and the solder strip 10 is placed.

Referring to fig. 22 and 23, the plurality of solder ribbons 10 are gripped by the first clamping portion 31, the second clamping portion 32 and the third clamping portion 33, and the plurality of solder ribbons 10 are placed on the electrodes of the plurality of back contact batteries 20. The first clamping portion 31, the second clamping portion 32, and the third clamping portion 33 correspond to the leading end, the trailing end, and the intermediate portion of the plurality of solder strips 10, respectively.

Referring to fig. 22, a gap is formed between two adjacent back contact cells 20, the number of the third clamping portions 33 is multiple, and each third clamping portion 33 corresponds to one gap. The solder strip 10 includes a plurality of first solder strips 11 and a plurality of second solder strips 12, and each of the third clamping portions 33 clamps the first solder strips 11 and the second solder strips 12. Each of the third clamping portions 33 includes a first cut piece corresponding to the first solder fillet 11 and a second cut piece corresponding to the second solder fillet 12, and the preparation method further includes, before step S30:

cutting the clamped portions of the plurality of first welding strips 11 on one side of the conductive strip 60 by using the first cutting member corresponding to the first welding strips 11;

the clamped portions of the plurality of second solder strips 12 are cut on the other side of the conductive strip 60 by the second cutting member corresponding to the second solder strips 12.

So, the first strip 11 and the second strip 12 that welds of centre gripping in the lump cuts first strip 11 and the second strip 12 that welds respectively in the both sides of busbar 60 for the first cut that welds strip 11 and the second strip 12 that welds is located busbar 60's both sides respectively, thereby makes the flow direction of electric current be the Z style of calligraphy, guarantees to weld the opposite sex main grid of the length direction dislocation in area and can communicate.

In the example of fig. 22 and 23, the first solder fillet 11 is cut on the side of the conductive strip 60 away from the first clamping portion 31, and the second solder fillet 12 is cut on the side of the conductive strip 60 close to the first clamping portion 31.

Specifically, the third clamping portion 33 may continuously cover the cut areas of the first and second solder strips 11 and 12, as shown in fig. 22. Thus, each third clamping part 33 can form a whole, can integrally move and position, and is simpler to control and more accurate to position.

It is understood that in other embodiments, the third clamping portion 33 may also cover the cut areas of the first solder strip 11 and the second solder strip 12, respectively, similar to fig. 6. So, can be through the centre gripping for cutting the location for cut more accurately.

Specifically, referring to fig. 23, after each solder strip 10 is cut, two cuts are formed, and the two cuts of each solder strip 10 are located on one side of the conductive strip 60. In this way, it is ensured that one cut of each solder strip 10 corresponds to one solder strip 10 connected to the conductive strip 60, and a gap is formed between the other cut of each solder strip 10 and the conductive strip 60, so that the connection is impossible.

It will be appreciated that after each solder strip 10 is severed, two cuts are made, corresponding to the two severed solder strips 10. For two conductive strips 60 corresponding to two adjacent spaces, one end of each solder strip 10 intersects one conductive strip 60, and the other end forms a gap with the other conductive strip 60. The end of each solder cut strip 10 intersecting the conductive strip 60 may pass through the conductive strip 60 and the insulating strip 50 as shown in fig. 23, or may pass through only the conductive strip 60 and be located within the insulating strip 50, or may be located within the conductive strip 60. The end of each solder cut strip 10 that forms a gap with the conductive strip 60 can be outside the area of the insulating strip 50 as shown in fig. 23, or can be within the area of the insulating strip 50 and outside the area of the conductive strip 60.

The specific position of the end of each solder cut strip 10 intersecting the conductive strip 60 is not limited as long as it can be connected to the conductive strip 60. The specific position of the end of each solder cut strip 10 that forms a gap with the conductive strip 60 is not limited as long as the solder cut strip is not connected to the conductive strip 60.

For further explanation and explanation of the cropping, reference is made to the above description, and further explanation is omitted here to avoid redundancy.

Referring to fig. 24, a press 40 is placed on a plurality of back contact cells 20 on which a plurality of solder ribbons 10 are placed. For the explanation and explanation of this part, reference is made to the foregoing description, and redundant description is omitted here.

Referring to fig. 2 and 17, a back contact battery string 100 according to an embodiment of the present disclosure is manufactured by using any one of the methods for manufacturing the back contact battery string 100.

The battery pack of the embodiment of the present application includes the back contact battery string 100 described above.

In the battery string and the battery pack according to the embodiment of the present invention, since the plurality of back contact batteries 20 are collectively moved, the plurality of solder ribbons 10 are collectively placed, and the plurality of back contact batteries 20 on which the presser 40 and the plurality of solder ribbons 10 are placed are collectively moved, the production efficiency of the back contact battery string 100 can be improved.

For the explanation and explanation of the back contact battery string 100 and the battery assembly, reference is made to the foregoing description, and the description is omitted here for the sake of avoiding redundancy.

The production equipment comprises a sheet swinging mechanism, a mechanical arm, a bearing platform 102 and a welder, wherein the sheet swinging mechanism is used for arranging a plurality of back contact batteries 20; the manipulator is used for moving the arranged back contact batteries 20 to the feeding station together, and the back surfaces of the back contact batteries 20 deviate from the bearing platform 102 of the feeding station; the manipulator is used for collectively placing a plurality of solder strips 10 on a plurality of back contact batteries 20 at a loading station; the manipulator is used for placing the pressing tool 40 on the back contact batteries 20 on which the solder strips 10 are placed at the loading station; the carrying platform 102 is used for moving the back contact batteries 20 on which the pressing tool 40 and the solder strips 10 are placed to a welding station together; the welder is used for welding the plurality of solder strips 10 with the plurality of back contact cells 20 at a welding station; the carrying platform 102 is used for moving the plurality of back contact batteries 20 after welding to the stringing station together.

In the production apparatus of the embodiment of the present application, since the plurality of back contact batteries 20 are collectively moved, the plurality of solder ribbons 10 are collectively placed, and the plurality of back contact batteries 20 on which the presser 40 and the plurality of solder ribbons 10 are placed are collectively moved, the production efficiency of the back contact battery string 100 can be improved.

For explanation and explanation of the production apparatus, reference is made to the foregoing description, and redundant description is omitted here.

Preferably, the tab mechanism is used to align all of the back contact cells 20 required for a full string of cells; the manipulator is used for moving all back contact batteries 20 required by the arranged whole battery string to the feeding station; the manipulator is used for placing all welding strips 10 required by the whole string of battery strings on the back contact batteries 20 at the loading station; the carrying platform 102 is used for moving all back contact batteries 20 of all welding strips 10 required by the pressing tool 40 and the whole string of batteries to a welding station; the welder is used for welding all welding strips 10 required by the whole string of battery strings with all back contact batteries 20 required by the whole string of battery strings at a welding station; the carrying platform 102 is used for moving all back contact batteries 20 required by the whole welded battery string to the string outlet station together.

Optionally, the production equipment comprises a dicing mechanism, wherein the dicing mechanism is used for dicing the back contact cells 20 to form at least two back contact cells 20; the wobble plate mechanism is used to rotate every other back contact cell 20 one hundred eighty degrees for one back contact cell 20.

Optionally, a robot is used to place the insulating strip 50 on the space between two adjacent back contact cells 20.

Optionally, the insulating strip 50 includes a first adhesive layer, and the support platform 102 is configured to be heated to a predetermined temperature such that the first adhesive layer adheres the insulating strip 50 and the back contact cell 20.

Optionally, the preset temperature is 90 ℃ to 100 ℃.

Optionally, the width of the insulating strip 50 is 2mm-8 mm.

Optionally, the insulating strip 50 is PET.

Optionally, one side of the insulating strip 50 is provided with a first adhesive layer, the other side of the insulating strip 50 is sequentially provided with a second adhesive layer and a conductive strip 60, the width of the conductive strip 60 is smaller than that of the insulating strip 50, and the manipulator places the first adhesive layer on two adjacent back contact batteries 20.

Optionally, the insulating strip 50 is continuous or intermittent.

Optionally, a vacuum suction structure of the carrier platform 102 is used to fix the position of the back contact battery 20 on the carrier platform 102.

Alternatively, the first clamping portion 31, the second clamping portion 32 and the third clamping portion 33 of the robot hand place the plurality of solder strips 10 to be connected onto the electrodes of the plurality of back contact cells 20, and the first clamping portion 31, the second clamping portion 32 and the third clamping portion 33 correspond to the head end, the tail end and the middle portion of the plurality of solder strips 10, respectively.

Optionally, the solder strip 10 comprises a plurality of first solder strips 11 and a plurality of second solder strips 12; the first clamping part 31 comprises a plurality of first clamping jaws 311 and a plurality of second clamping jaws 312, the first clamping jaws 311 and the second clamping jaws 312 are arranged in a staggered mode, the first clamping jaws 311 are used for clamping the head end of the first welding strip 11, and the second clamping jaws 312 are used for clamping the head end of the second welding strip 12; the second clamping portion 32 includes a plurality of third clamping jaws 321 and a plurality of fourth clamping jaws 322, the third clamping jaws 321 and the fourth clamping jaws 322 are staggered, the third clamping jaws 321 are used for clamping the tail end of the first solder strip 11, and the fourth clamping jaws 322 are used for clamping the tail end of the second solder strip 12.

Alternatively, a gap is formed between two adjacent back contact cells 20, the number of the third clamping parts 33 is multiple, and each third clamping part 33 corresponds to one gap.

Alternatively, the distance between two adjacent third clamping portions 33 is greater than the width of the back contact cell 20; specifically, the distance between two adjacent third clamping portions 33 is equal to the sum of the width of the back contact cell 20 and the width of the gap;

and/or the distance between the first clamping part 31 and the adjacent third clamping part 33 is larger than the width of the back contact cell 20; specifically, the distance between the first clamping portion 31 and the adjacent third clamping portion 33 is equal to the sum of the width of the back contact cell 20 and the width of the gap;

and/or the distance between the second clamping portion 32 and the adjacent third clamping portion 33 is greater than the width of the back contact cell 20; specifically, the distance between the second clamping portion 32 and the adjacent third clamping portion 33 is equal to the sum of the width of the back contact cell 20 and the width of the void.

Optionally, the solder strip 10 comprises a plurality of first solder strips 11 and a plurality of second solder strips 12; of the two adjacent third clamping portions 33, one third clamping portion 33 is used for clamping the first solder strip 11, and the other third clamping portion 33 is used for clamping the second solder strip 12; the cutting piece of the third clamping portion 33 is used for cutting clamped portions of the plurality of first solder strips 11 and the plurality of second solder strips 12;

or, the solder strip 10 includes a plurality of first solder strips 11 and a plurality of second solder strips 12, and the third clamping portion 33 clamps the first solder strips 11 and the second solder strips 12; the third clamping parts 33 comprise cut pieces, the cut pieces of two adjacent third clamping parts 33 respectively correspond to the first welding strips 11 and the second welding strips 12, and the cut pieces corresponding to the first welding strips 11 are used for cutting clamped parts of a plurality of first welding strips 11; the cut piece corresponding to the second weld beads 12 is used to cut the clamped portions of the plurality of second weld beads 12.

Optionally, the manipulator comprises a transport section provided between the first 31, second 32 and third 33 gripping sections for moving the hold-down 40 from the initial position to the raised position; the first clamping part 31, the second clamping part 32 and the third clamping part 33 are used for grabbing the welding strip 10; the transport section is used to move the presser 40 from the raised position to the depressed position so that the presser 40 presses on the back contact battery 20 on which the solder ribbon 10 is placed.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims

1. A method of making a back contact battery string, comprising:

placing a press on the plurality of back contact cells on which the plurality of solder ribbons are placed at the loading station;

welding a plurality of said solder ribbons with a plurality of said back contact cells at said welding station;

and moving the welded back contact batteries to a string outlet station together.

2. The method of claim 1, wherein arranging a plurality of back contact cells using a tab arrangement comprises:

arranging all back contact batteries required by the whole string of battery strings by using a sheet arranging mechanism;

moving a plurality of back contact batteries arranged to an unloading station together, comprising:

all back contact batteries required by the arranged whole battery string are moved to a feeding station;

collectively placing a plurality of solder ribbons onto a plurality of back contact cells at the loading station, comprising:

placing all of the solder strips required for a complete string of cells onto a plurality of back contact cells at the loading station;

collectively moving the plurality of back contact batteries on which the presser and the plurality of solder ribbons are placed to a soldering station, including:

moving all the back contact batteries of all the welding strips required by the pressing tool and the whole string of battery strings to a welding station;

welding a plurality of the solder ribbons with a plurality of the back contact cells at the welding station, comprising:

welding all the welding strips required by the whole string of battery strings and all the back contact batteries required by the whole string of battery strings at the welding station;

moving a plurality of back contact batteries after welding to a cluster station in unison, including:

and moving all the back contact batteries required by the whole welded battery string to a string outlet station.

3. The method of manufacturing a back contact battery string according to claim 1, wherein prior to the step of arranging a plurality of back contact batteries using a tab mechanism, the method of manufacturing comprises:

dicing back contact cell slices to form at least two back contact cells;

arranging a plurality of back contact cells using a tab mechanism, comprising:

and rotating one back contact battery by one hundred and eighty degrees by the swinging piece mechanism every other back contact battery.

4. The method for preparing a back contact battery string according to claim 1, wherein before the step of collectively moving the arranged plurality of back contact batteries to a loading station, the method comprises:

and placing an insulating strip on the gap between two adjacent back contact batteries.

5. The method of claim 4, wherein the insulating strip comprises a first adhesive layer, and the method comprises, before the step of collectively moving the arranged plurality of back-contact cells to the feeding station:

and heating the bearing platform to a preset temperature so that the first adhesive layer adheres the insulating strip and the back contact battery.

6. The method of manufacturing a back contact battery string according to claim 5, wherein the preset temperature is 90 ℃ to 100 ℃.

7. The method of manufacturing a back contact battery string according to claim 4, wherein the width of the insulating strip is 2mm to 8 mm.

8. The method of manufacturing a back contact battery string according to claim 4, wherein the insulating strip is PET.

9. The method for preparing the back contact battery string according to claim 4, wherein one surface of the insulating strip is provided with a first adhesive layer, the other surface of the insulating strip is sequentially provided with a second adhesive layer and a conductive strip, the width of the conductive strip is smaller than that of the insulating strip, and the insulating strip is placed in a gap between two adjacent back contact batteries, and the method comprises the following steps:

and placing the first adhesive layer on two adjacent back contact cells.

10. The method of manufacturing a back contact battery string according to claim 4 or 9, wherein the insulating strip is continuous or discontinuous.

11. The method of manufacturing a back contact cell string according to claim 1, wherein after the step of arranging the plurality of back contact cells using a wobble plate mechanism, the method of manufacturing comprises:

and fixing the position of the back contact battery on the bearing platform by utilizing a vacuum adsorption structure of the bearing platform.

12. The method for preparing a back contact battery string according to claim 1 or 2, wherein collectively placing a plurality of solder ribbons on a plurality of back contact batteries at the feeding station comprises:

the first clamping part, the second clamping part and the third clamping part of the manipulator are utilized to place a plurality of solder strips to be connected on the electrodes of the back contact battery, and the first clamping part, the second clamping part and the third clamping part respectively correspond to a plurality of head ends, tail ends and middle parts of the solder strips.

13. The method of making a back contact battery string as recited in claim 12, wherein the solder ribbon comprises a plurality of first solder ribbons and a plurality of second solder ribbons;

the first clamping part comprises a plurality of first clamping jaws and a plurality of second clamping jaws, the first clamping jaws and the second clamping jaws are arranged in a staggered mode, the first clamping jaws clamp the head end of the first welding strip, and the second clamping jaws clamp the head end of the second welding strip;

the second clamping part comprises a plurality of third clamping jaws and a plurality of fourth clamping jaws, the third clamping jaws and the fourth clamping jaws are arranged in a staggered mode, the third clamping jaws clamp the tail end of the first welding strip, and the fourth clamping jaws clamp the tail end of the second welding strip.

14. The method of manufacturing a back contact cell string according to claim 12, wherein a gap is formed between two adjacent back contact cells, the number of the third clamping portions is plural, and each third clamping portion corresponds to one gap.

15. The method of manufacturing a back contact cell string according to claim 14, wherein a distance between adjacent two of the third clamping portions is greater than a width of the back contact cell; specifically, the distance between two adjacent third clamping parts is equal to the sum of the width of the back contact cell and the width of the gap;

and/or the distance between the first clamping part and the adjacent third clamping part is larger than the width of the back contact cell; specifically, the distance between the first clamping part and the adjacent third clamping part is equal to the sum of the width of the back contact cell and the width of the gap;

and/or the distance between the second clamping part and the adjacent third clamping part is larger than the width of the back contact battery; specifically, the distance between the second clamping portion and the adjacent third clamping portion is equal to the sum of the width of the back contact cell and the width of the gap.

16. The method of making a back contact battery string as recited in claim 14, wherein the solder ribbon comprises a plurality of first solder ribbons and a plurality of second solder ribbons; in two adjacent third clamping parts, one third clamping part clamps the first welding strip, and the other third clamping part clamps the second welding strip; prior to the step of welding a plurality of the solder ribbons to a plurality of the back contact cells at the welding station, the method of making further comprises:

cutting clamped portions of the plurality of first welding strips and the plurality of second welding strips by using the cutting piece of the third clamping portion;

or, the welding strip comprises a plurality of first welding strips and a plurality of second welding strips, and the third clamping part clamps the first welding strips and the second welding strips; the third clamping portions comprise cut pieces, the cut pieces of two adjacent third clamping portions respectively correspond to the first welding strips and the second welding strips, and before the step of welding the plurality of welding strips and the plurality of back contact batteries at the welding station, the preparation method further comprises the following steps of:

cutting a plurality of clamped parts of the first welding strips by using the cutting piece corresponding to the first welding strips;

and cutting the clamped parts of the second welding strips by using the cutting piece corresponding to the second welding strips.

17. The method of manufacturing a back contact cell string according to claim 12, wherein the robot arm includes a transport section provided between the first clamping section, the second clamping section, and the third clamping section, and the method further includes, before the step of collectively placing the plurality of solder ribbons on the plurality of back contact cells at the loading station;

moving a hold-down from an initial position to a raised position with the transport;

grabbing the plurality of solder strips by the first clamping part, the second clamping part and the third clamping part;

placing a press on the plurality of back contact cells on which the plurality of solder ribbons are placed at the loading station, including;

moving the presser from the raised position to a depressed position with the transport section to press the presser against the plurality of back contact cells on which the plurality of solder ribbons are placed.

18. A back contact battery string prepared by the method for preparing a back contact battery string according to any one of claims 1 to 17.

19. A battery assembly comprising the back contact battery string of claim 18.

20. The production equipment is characterized by comprising a sheet swinging mechanism, a mechanical arm, a bearing platform and a welder, wherein the sheet swinging mechanism is used for arranging a plurality of back contact batteries; the manipulator is used for moving the arranged back contact batteries to a feeding station together, and the back surfaces of the back contact batteries deviate from a bearing platform of the feeding station; the manipulator is used for placing a plurality of welding strips on the back contact batteries together at the feeding station; the manipulator is used for placing a pressing tool on the back contact batteries on which the welding strips are placed at the feeding station; the bearing platform is used for moving the back contact batteries on which the pressing tool and the welding strips are placed to a welding station together; the welder is used for welding a plurality of welding strips with a plurality of back contact batteries at the welding station; the bearing platform is used for moving the welded back contact batteries to a serial station together.

21. The manufacturing facility of claim 20, wherein the wobble plate mechanism is configured to align all of the back contact cells required for a complete string of cells; the manipulator is used for moving all back contact batteries required by the arranged whole battery string to a feeding station; the manipulator is used for placing all the welding strips required by the whole battery string on the back contact batteries together at the feeding station; the bearing platform is used for moving all the back contact batteries of all the welding strips required by the pressing tool and the whole string of batteries to a welding station; the welder is used for welding all the welding strips required by the whole string of battery strings with all the back contact batteries required by the whole string of battery strings at the welding station; the bearing platform is used for moving all back contact batteries required by the whole welded battery string to a string outlet station.

22. The production apparatus of claim 20, comprising a dicing mechanism for dicing back-contact cells to form at least two of the back-contact cells; the swing piece mechanism is used for rotating one back contact battery by one hundred and eighty degrees every other back contact battery.

23. The manufacturing apparatus of claim 20, wherein said robot is configured to place an insulating strip over a gap between two adjacent back contact cells.

24. The manufacturing apparatus of claim 23, wherein the insulating strip includes a first adhesive layer, and the carrier platform is configured to be heated to a predetermined temperature to cause the first adhesive layer to adhere the insulating strip to the back contact cells.

25. The production facility according to claim 24, wherein the preset temperature is 90-100 ℃.

26. The production apparatus as claimed in claim 23, wherein the width of the insulating strip is 2mm to 8 mm.

27. The production apparatus of claim 23, wherein the insulating strip is PET.

28. The production equipment as claimed in claim 23, wherein one side of the insulating strip is provided with a first adhesive layer, the other side of the insulating strip is sequentially provided with a second adhesive layer and a conductive strip, the width of the conductive strip is smaller than that of the insulating strip, and the manipulator places the first adhesive layer on two adjacent back contact cells.

29. The production apparatus as claimed in claim 23 or 28, wherein the insulating strip is continuous or discontinuous.

30. The manufacturing apparatus of claim 20, wherein the vacuum suction structure of the carrier platform is configured to fix the position of the back contact cell on the carrier platform.

31. The production apparatus as claimed in claim 20 or 21, wherein a first clamping portion, a second clamping portion and a third clamping portion of the robot hand place a plurality of the solder ribbons to be connected onto the electrodes of a plurality of the back contact cells, the first clamping portion, the second clamping portion and the third clamping portion respectively corresponding to a head end, a tail end and a middle portion of the plurality of the solder ribbons.

32. The production equipment of claim 31, wherein the solder strips include a plurality of first solder strips and a plurality of second solder strips; the first clamping part comprises a plurality of first clamping jaws and a plurality of second clamping jaws, the first clamping jaws and the second clamping jaws are arranged in a staggered mode, the first clamping jaws are used for clamping the head end of the first welding strip, and the second clamping jaws are used for clamping the head end of the second welding strip; the second clamping part comprises a plurality of third clamping jaws and a plurality of fourth clamping jaws, the third clamping jaws and the fourth clamping jaws are arranged in a staggered mode, the third clamping jaws are used for clamping the tail end of the first welding strip, and the fourth clamping jaws are used for clamping the tail end of the second welding strip.

33. The manufacturing apparatus of claim 31, wherein a gap is formed between two adjacent back contact cells, and the number of the third clamping portions is plural, and each third clamping portion corresponds to one gap.

34. The production apparatus according to claim 33, wherein a distance between adjacent two of the third clamping portions is larger than a width of the back contact cell; specifically, the distance between two adjacent third clamping parts is equal to the sum of the width of the back contact cell and the width of the gap;

and/or the distance between the second clamping part and the adjacent third clamping part is larger than the width of the back contact cell; specifically, the distance between the second clamping portion and the adjacent third clamping portion is equal to the sum of the width of the back contact cell and the width of the gap.

35. The production equipment of claim 33, wherein the solder strips include a plurality of first solder strips and a plurality of second solder strips; one of the two adjacent third clamping parts is used for clamping the first welding strip, and the other third clamping part is used for clamping the second welding strip; the cutting piece of the third clamping part is used for cutting clamped parts of the first welding strips and the second welding strips;

or, the welding strip comprises a plurality of first welding strips and a plurality of second welding strips, and the third clamping part clamps the first welding strips and the second welding strips; the third clamping parts comprise cutting pieces, the cutting pieces of two adjacent third clamping parts respectively correspond to the first welding strips and the second welding strips, and the cutting pieces corresponding to the first welding strips are used for cutting clamped parts of a plurality of first welding strips; and cutting the clamped parts of the second welding strips by using the cutting pieces corresponding to the second welding strips.

36. The production facility of claim 31 wherein the robot includes a transport section disposed between the first, second and third clamping sections for moving the hold-down from an initial position to a raised position; the first clamping part, the second clamping part and the third clamping part are used for grabbing the plurality of welding strips; the transportation part is used for moving the pressing tools from the lifting position to the pressing position so that the pressing tools press the back contact batteries on which the solder strips are placed.