CN117577700A - Solar cell related structure and method for manufacturing same - Google Patents
Solar cell related structure and method for manufacturing same Download PDFInfo
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- CN117577700A CN117577700A CN202311658775.3A CN202311658775A CN117577700A CN 117577700 A CN117577700 A CN 117577700A CN 202311658775 A CN202311658775 A CN 202311658775A CN 117577700 A CN117577700 A CN 117577700A
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- battery
- adhesive tape
- solar cell
- peripheral side
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title description 9
- 230000002093 peripheral effect Effects 0.000 claims abstract description 70
- 238000004904 shortening Methods 0.000 claims abstract description 12
- 239000002390 adhesive tape Substances 0.000 claims description 128
- 238000005520 cutting process Methods 0.000 claims description 26
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims 1
- 238000009413 insulation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 12
- 238000010248 power generation Methods 0.000 description 7
- 238000003466 welding Methods 0.000 description 7
- 239000003292 glue Substances 0.000 description 6
- 239000005341 toughened glass Substances 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 239000002313 adhesive film Substances 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/022433—Particular geometry of the grid contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Energy (AREA)
- Manufacturing & Machinery (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a solar cell related structure and a manufacturing method thereof, wherein the lengths of a first thin grid line and a second thin grid line of a cell chip extend along a first direction, the first thin grid line and the second thin grid line are alternately arranged at intervals along a second direction, the first thin grid line comprises a first protruding end and a first shortening end, the second thin grid line comprises a second protruding end and a second shortening end, the distance between the first shortening end and a first peripheral side surface is L1, the distance between the first protruding end and the second peripheral side surface is L2, the distance between the second protruding end and the first peripheral side surface is L3, the distance between the second shortening end and the second peripheral side surface is L4, L1> L3>0mm, and L4> L2>0mm. One end of the first fine grid line protruding out of the second fine grid line can be connected with a circuit connecting piece, insulation can be carried out between the second fine grid line and the circuit connecting piece in a space interval mode, an insulating piece is not needed, and the cost of a battery small piece is reduced.
Description
Technical Field
The invention relates to the technical field of solar power generation, in particular to a battery small piece, a double-divided battery piece, a solar battery serial unit, a solar battery parallel unit, a solar battery assembly and a manufacturing method thereof.
Background
Conventional solar cells employ a primary grid design and solar modules use solder ribbons and bus bars to complete the circuit connection. Because the battery piece has hard contact and thermal welding in the manufacturing process, the hidden cracking risk is higher; meanwhile, the bus bars are used, so that the area of the assembly is increased, and the cost of the assembly and the power generation efficiency are affected; the design of the main grid increases the consumption of silver paste and increases the cost of the battery piece and the assembly.
The solar cell module comprises a plurality of small cell pieces, a main grid line and a plurality of thin grid lines are arranged on the small cell pieces, wherein the negative electrode main grid line is connected with the negative electrode thin grid line, the positive electrode main grid line is connected with the positive electrode thin grid line, insulating glue is required to be arranged between the negative electrode main grid line and the positive electrode thin grid line in order to avoid the contact of the positive electrode and the negative electrode inside the small cell pieces, insulating glue is also required to be arranged between the positive electrode main grid line and the negative electrode thin grid line, the occupation of a non-power generation structure to the internal space of the solar cell module is increased due to the arrangement of the insulating glue, the production steps of the solar cell module are also increased, the power generation efficiency of the solar cell module is not improved, and the control of the production cost is also not facilitated.
Disclosure of Invention
One object of an embodiment of the invention is to: the battery small piece and the double-split battery piece are low in cost, and the risk of hidden cracking of the cut battery small piece is small.
Another object of an embodiment of the invention is to: the solar cell serial unit, the solar cell parallel unit and the solar cell assembly are good in quality and low in cost.
A further object of an embodiment of the invention is that: provided is a method for manufacturing a solar cell module, which has high production efficiency.
In order to achieve the above purpose, the invention adopts the following technical scheme:
in a first aspect, a battery small piece is provided, the battery small piece includes a first peripheral side face and a second peripheral side face, a plurality of first thin grid lines and a plurality of second thin grid lines are arranged on the back face of the battery small piece, the lengths of the first thin grid lines and the second thin grid lines extend along a first direction, the first thin grid lines and the second thin grid lines are alternately arranged at intervals along a second direction, the first thin grid lines include first protruding ends and first shortening ends, the second thin grid lines include second protruding ends and second shortening ends, the distance between the first shortening ends and the first peripheral side face is L1, the distance between the first protruding ends and the second peripheral side face is L2, the distance between the second protruding ends and the first peripheral side face is L3, the distance between the second shortening ends and the second peripheral side face is L4, L1> 0mm, and L4> 0mm.
As a preferred aspect of the battery cell, the battery cell further includes a third peripheral side surface and a fourth peripheral side surface, the third peripheral side surface and the fourth peripheral side surface being perpendicular to the first peripheral side surface, the first peripheral side surface and the second peripheral side surface being parallel;
and/or the number of the groups of groups,
the end parts of all the first thin grid lines are flush, and the end parts of all the second thin grid lines are flush.
In a second aspect, a dual-split battery piece is provided, wherein a cutting part is arranged on the back surface of the dual-split battery piece, and the dual-split battery piece can be cut into two battery small pieces at the cutting part, and the arrangement directions of the two battery small pieces are the same.
In a third aspect, a solar cell serial unit is provided, including a serial adhesive tape and two above-mentioned battery small pieces, the serial adhesive tape is the conductive adhesive tape, the serial adhesive tape is located the back of battery small piece, the serial adhesive tape with one of them battery small piece on the first protruding end is connected, and this one of them battery small piece on the second thin grid line with the serial adhesive tape interval, the serial adhesive tape with another battery small piece on the second protruding end is connected, and this another battery small piece on the first thin grid line with the serial adhesive tape interval.
The fourth aspect provides a solar cell parallel unit, including parallelly connected adhesive tape and two foretell battery cells, parallelly connected adhesive tape is the conducting strip, parallelly connected adhesive tape is located the back of battery cell, parallelly connected adhesive tape respectively with two on the battery cell first protruding end is connected, just on the battery cell second thin grid line with parallelly connected adhesive tape interval, or, parallelly connected adhesive tape respectively with two on the battery cell second protruding end is connected, just on the battery cell first thin grid line with parallelly connected adhesive tape interval.
In a fifth aspect, a solar cell module is provided, wherein the solar cell series unit and/or the solar cell parallel unit are/is provided.
As a preferred scheme of the solar cell module, the two cell small pieces in the solar cell series unit are arranged along a first direction, or the two cell small pieces in the solar cell series unit are arranged along a second direction; the first direction is perpendicular to the second direction;
the two battery small pieces in the solar cell parallel unit are arranged along the first direction, or the two battery small pieces in the solar cell parallel unit are arranged along the second direction;
the distance between the peripheral sides of two adjacent battery chips along the first direction is W1, and W1 is more than or equal to 0mm and less than or equal to 1.3mm.
As a preferred scheme of the solar cell module, the solar cell module comprises two cell small pieces which are arranged along the first direction, the width center of a conductive adhesive tape in the solar cell module is aligned with the splicing edges of the two cell small pieces, and the maximum width of the conductive adhesive tape is D,0.5D is less than L4, and 0.5D is less than L1.
In a sixth aspect, there is provided a method of manufacturing a solar cell module, comprising the steps of:
step 100, cutting along the cutting position of the double-divided battery piece, and separating the double-divided battery piece into the battery small pieces;
step 200, arranging the battery small pieces;
and 300, sticking or forming a conductive adhesive tape on the small battery pieces so as to enable the small battery pieces to be connected in series to form the solar battery serial unit, and enabling the small battery pieces to be connected in parallel to form the solar battery parallel unit.
As a preferred embodiment of the method for manufacturing a solar cell module,
the solar cell series unit comprises the following forming steps: after cutting the double-divided battery pieces, directly splicing the two battery pieces, and then forming the conductive adhesive tape;
the solar cell parallel unit comprises the following forming steps: and after cutting the double-divided battery pieces, rotating one of the battery pieces by 180 degrees so as to enable the first peripheral side face/the second peripheral side face of the two battery pieces to be attached, and then forming the conductive adhesive tape.
The beneficial effects of the invention are as follows: by setting L1> L3>0mm and L4> L2>0mm, the ends of the first fine grid line and the second fine grid line are not flush, when the first protruding end of the first fine grid line of the battery small piece is used for circuit connection, as L4> L2, the second shortened end of the second fine grid line of the battery small piece has enough space to accommodate the circuit connection piece, the second fine grid line of the battery small piece can be insulated with the circuit connection piece in a space interval mode, an insulating piece is not needed to be additionally used, and likewise, when the second protruding end of the second fine grid line of the battery small piece is used for circuit connection, as L1> L3, the first shortened end of the first fine grid line of the battery small piece is accommodated by enough space, the first fine grid line of the battery small piece can be insulated with the circuit connection piece in a space interval mode, an insulating piece is not needed to be additionally used, the first fine grid line and the second fine grid line can be directly connected with the circuit connection piece respectively, thus the battery small piece is not needed to be arranged, the battery small size can be manufactured, the cost of the battery small battery can be reduced, and the battery small size can be manufactured, and the cost of the battery small size can be reduced; by arranging the grid lines on the double-split battery piece to be spaced from the cutting positions, hard contact between the cutter and the grid lines can be avoided, so that the situation that the grid lines press the double-split battery piece in the cutting process to cause hidden cracks on the silicon substrate of the double-split battery piece can be avoided; the conductive adhesive tape is a flexible piece, the hardness of the conductive adhesive tape is far less than that of the battery small piece, and the conductive adhesive tape can not be in hard contact with the battery small piece, so that the problem that the battery small piece is pressed to generate hidden cracks due to hard contact can be avoided.
Drawings
The invention is described in further detail below with reference to the drawings and examples.
Fig. 1 is a schematic view of a dual-split battery sheet according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a cut double-divided battery piece according to an embodiment of the invention.
Fig. 3 is a schematic view of a battery die according to an embodiment of the invention.
Fig. 4 is a schematic diagram of a battery string (battery cells connected in series) according to an embodiment of the invention.
FIG. 5 is a schematic cross-sectional view at A-A of FIG. 4.
Fig. 6 is a schematic diagram of the circuit structure of fig. 4 (the first thin gate line is the positive electrode, and the second thin gate line is the negative electrode).
Fig. 7 is a schematic view of an assembled state (with the cell rotated) of the solar cell module according to the embodiment of the invention.
Fig. 8 is a schematic view of another assembled state (after the rotation of the battery die) of the solar cell module according to the embodiment of the invention.
Fig. 9 is a schematic view of the assembled battery of fig. 8 (with the battery cells arranged in a first direction and in parallel).
Fig. 10 is a schematic diagram of a battery string (with battery cells arranged in a first direction and connected in parallel) according to another embodiment of the invention.
Fig. 11 is a schematic diagram of a series connection of a plurality of battery cells according to an embodiment of the invention.
Fig. 12 is a schematic diagram showing battery cells arranged in a second direction and connected in parallel according to an embodiment of the invention.
Fig. 13 is a schematic view of battery cells arranged in a second direction and connected in parallel according to another embodiment of the invention.
Fig. 14 is a schematic diagram of series connection and parallel connection among a plurality of battery cells in a solar cell module according to an embodiment of the invention.
Fig. 15 is a schematic diagram of the circuit structure of fig. 14 (the first thin gate line is the positive electrode and the second thin gate line is the negative electrode).
Fig. 16 is an enlarged schematic view at B of fig. 14.
Fig. 17 is a schematic diagram of battery cells arranged in a second direction and connected in series according to an embodiment of the invention.
In the figure:
1. a double-divided battery piece; 101. a wiring region; 102. cutting; 11. a battery tab; 111. a body; 112. a first thin gate line; 1121. a first projection; 1122. a first shortened end; 113. a second thin gate line; 1131. a second projection; 1132. a second shortened end; 114. a first peripheral side surface; 115. a second peripheral side surface; 2. a conductive adhesive tape; 21. connecting adhesive tapes in series; 211. a first series unit, 212, and a second series unit; 22. connecting adhesive tapes in parallel; 221. a first parallel section; 222. and a second parallel connection part.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 3, in the battery small piece 11 provided by the invention, the battery small piece 11 comprises a first peripheral side surface 114 and a second peripheral side surface 115, a plurality of first fine grid lines 112 and second fine grid lines 113 are arranged on the back surface of the battery small piece 11, the back surface of the battery small piece 11 refers to a side surface of the battery small piece 11 far away from the sun in a use state, the battery small piece 11 comprises a body 111, the first fine grid lines 112 and the second fine grid lines 113 are positioned on the back side surface of the body 111, the lengths of the first fine grid lines 112 and the second fine grid lines 113 extend along a first direction, the first fine grid lines 112 and the second fine grid lines 113 are alternately arranged along a second direction, the first direction and the second direction are vertical, the first direction is parallel to the illustrated X direction, the second direction is parallel to the illustrated Y direction, the distance between the end part of the first fine grid lines 112 and the first peripheral side surface 114 is L1, the distance between the end part of the first fine grid lines 112 and the second peripheral side surface 115 is L2, the lengths between the end part of the second fine grid lines 113 and the second peripheral side surface 115 are 0 ml 3 and the end part of the second fine grid lines 114 are 0 ml 3, and L3 and L2> 4 m. In the drawing, the first gate line 112 and the second gate line 113 are distinguished by using hatching having different densities and directions.
By providing L1> L3>0mm and L4> L2>0mm, that is, the ends of the first fine grid line 112 and the second fine grid line 113 are not flush, referring to fig. 4, when the first protruding end 1121 of the first fine grid line 112 of the battery small piece 11 is used for circuit connection, since L4> L2, the second shortened end 1132 of the second fine grid line 113 of the battery small piece 11 has enough space to accommodate a circuit connection member, the second fine grid line 113 of the battery small piece 11 can be insulated from the circuit connection member in a space-apart manner, and an insulating member is not required to be additionally used, and likewise, when the second protruding end 1131 of the second fine grid line 113 of the battery small piece 11 is used for circuit connection, since L1> L3, the first shortened end 1122 of the first fine grid line 112 of the battery small piece 11 has enough space to accommodate the circuit connection member, the first fine grid line 112 of the battery small piece 11 can be insulated from the circuit connection member in a space-apart manner, and no additional insulating member is required, and the second fine grid line 113 of the battery small piece 11 can be directly connected with the battery small piece 11, and the cost of the battery small piece 11 can be reduced.
In the simplified diagram of the battery small pieces 11, only two first thin grid lines 112 and two second thin grid lines 113 are drawn on each battery small piece 11 in the diagram, and in actual products, the number of the first thin grid lines 112 and the second thin grid lines 113 on the battery small piece 11 is not limited by the number of the diagrams, and a plurality of, for example, 50, 100, 200, etc. thin grid lines 112 and 113 on the battery small piece 11 can be provided.
In the present embodiment, the battery cell 11 further includes a third peripheral side surface and a fourth peripheral side surface, which are perpendicular to the first peripheral side surface 114, and the first peripheral side surface 114 and the second peripheral side surface 115 are parallel, that is, in the present embodiment, the first direction and the second direction are perpendicular, and the battery cell 11 has a rectangular shape. Through setting up the battery cell 11 of rectangle, can array arrangement battery cell 11 for battery cell 11 is orderly arranged, and when arranging battery cell 11, the week side of two adjacent battery cells 11 can advance to hug closely, and the interval between the minimum reduction battery cell 11 also makes things convenient for circuit connection of circuit connection spare and battery cell 11 on the circuit connection of thin bars line simultaneously.
Referring to fig. 2 and 3, l1=l4, l3=l2, that is, the distance between the end of the first thin gate line 112 and the first peripheral side surface 114 is equal to the distance between the end of the second thin gate line 113 and the second peripheral side surface 115, and the distance between the end of the second thin gate line 113 and the first peripheral side surface 114 is equal to the distance between the end of the first thin gate line 112 and the second peripheral side surface 115. By setting l1=l4 and l3=l2, the two end portions of the first thin grid line 112 and the second thin grid line 113 on the battery small piece 11 are correspondingly equal to the edge distance of the battery small piece 11, so that connection between the follow-up parts of the first thin grid line 112 and the second thin grid line 113 on the battery small piece 11 and the circuit connecting piece can be facilitated.
Further, on each battery cell 11, all the first thin grid lines 112 are flush with each other in end, and all the second thin grid lines 113 are flush with each other in end. On each small battery piece 11, the end parts of all the first fine grid lines 112 are flush, and the end parts of all the second fine grid lines 113 are flush, so that the subsequent connection between the small battery pieces 11 and the circuit connecting piece can be facilitated, the circuit connecting piece can be connected with each fine grid line, and the conduction of a circuit and the collection of current are realized.
As shown in fig. 1 and fig. 2, the back side of the double-split battery piece 1 provided by the invention is provided with two wiring areas 101 arranged along a first direction (the first direction is parallel to the X direction in the drawing), the wiring forms in the two wiring areas 101 are consistent, a cutting part 102 is arranged between the two wiring areas 101, in this embodiment, the cutting part 102 is a straight line, the two wiring areas 101 are spaced from the cutting part 102, the double-split battery piece 1 can be cut into two battery small pieces 11 in the above embodiment, and the arrangement directions of the two battery small pieces 11 are the same. By arranging the two wiring areas 101 on the double-split battery piece 1 to be spaced from the cutting part 102, hard contact between a cutter and a grid line can be avoided, so that the grid line can be prevented from pressing the double-split battery piece 1 in the cutting process, and hidden cracks are prevented from occurring on the silicon substrate of the double-split battery piece 1; by providing the wiring patterns in the two wiring areas 101 to be identical, that is, the first thin-gate line 112 in one of the wiring areas 101 and the first thin-gate line 112 in the other wiring area are positioned on the same straight line, the second thin-gate line 113 in one of the wiring areas 101 and the second thin-gate line 113 in the other wiring area 101 are positioned on the same straight line, the manufacturing difficulty of the double-split battery piece 1 can be reduced, and the cost can be reduced.
Referring to fig. 4, 5, 6 and 17, the present embodiment further provides a solar cell serial unit, which includes a serial adhesive tape 21 and the cell tabs 11 in any of the foregoing embodiments, where the serial adhesive tape 21 is a conductive adhesive tape 2, the serial adhesive tape 21 is located on the back of the cell tabs 11, the serial adhesive tape 21 is connected with the first protruding end 1121 of one of the cell tabs 11, the second thin grid line 113 on the cell tab 11 is spaced from the serial adhesive tape 21, the serial adhesive tape 21 is connected with the second protruding end 1131 on the other cell tab 11, and the first thin grid line 112 on the cell tab 11 is spaced from the serial adhesive tape 21.
It should be noted that, the small battery pieces 11 in the solar battery serial units may be arranged along the first direction or the second direction, and there are various arrangements. Referring to fig. 4, two battery cells 11 are arranged in a first direction, and referring to fig. 17, two battery cells 11 are arranged in a second direction.
The conductive adhesive tape 2 (the serial adhesive tape 21) in the embodiment is the circuit connecting piece mentioned in the embodiment, and by arranging the conductive adhesive tape 2, the conductive adhesive tape 2 can form electric conduction between the small battery pieces 11, so as to realize current collection; the conductive adhesive tape 2 is a flexible piece, the hardness of the conductive adhesive tape 2 is far less than that of the battery small piece 11, and the conductive adhesive tape 2 cannot generate hard contact with the battery small piece 11, so that the problem of hidden cracking caused by the compression of the battery small piece 11 due to the hard contact can be avoided; the conductive adhesive tape 2 has viscosity, can be directly adhered to the battery small piece 11, does not need a welding procedure, is convenient to operate, can improve the assembly efficiency on one hand, and can avoid the problem that the battery small piece 11 is hidden and cracked due to the welding procedure on the other hand; because the conductive adhesive tape 2 has viscosity and can be directly adhered to the small battery pieces 11, when the small battery pieces 11 are arranged, a reserved space is not required for placing bus bars and welding, so that the small battery pieces 11 can be arranged more tightly, the area of a solar battery assembly is reduced, and the power generation efficiency of the solar battery assembly is improved; because the small battery pieces 11 can be arranged more tightly, the sizes of parts such as the shell of the solar battery assembly can be correspondingly reduced, so that the production cost of the solar battery assembly can be reduced, and the sizes of the parts such as the shell of the solar battery assembly can be reduced, so that the overall size and weight of the solar battery assembly can be correspondingly reduced, and the transportation cost of the solar battery assembly can be reduced; the conductive adhesive tape 2 is used for circuit connection, the gram weight of the conductive adhesive tape 2 is far lower than that of a bus bar in the prior art, so that the weight of the solar cell module can be reduced; by arranging the thin grid lines which do not need to be connected with the conductive adhesive tape 2 at intervals, the thin grid lines which do not need to be connected with the conductive adhesive tape 2 in the battery small piece 11 can be insulated at intervals in a space interval mode, so that short circuit in the battery small piece 11 is avoided; the conductive adhesive tape 2 is arranged on the back side surface of the body 111, and the back surface of the body 111 is directly provided with the conductive adhesive tape 2, so that on one hand, the adhesive distribution difficulty can be reduced, and on the other hand, the conductive adhesive tape 2 is not required to be arranged between the small battery pieces 11, so that the small battery pieces 11 can be arranged more tightly, and the distance between the small battery pieces 11 is reduced.
Referring to fig. 9, 10, 12 and 13, the present embodiment further provides a solar cell parallel unit, including a parallel adhesive tape 22 and the cell tabs 11 in any of the foregoing embodiments, where the parallel adhesive tape 22 is a conductive adhesive tape 2, the parallel adhesive tape 22 is located on the back surface of the cell tab 11, referring to fig. 9 and 12, in one embodiment, the parallel adhesive tape 22 is connected to the first thin grid lines 112 on the two cell tabs 11, the parallel adhesive tape 22 is respectively connected to the first protruding ends 1121 on the two cell tabs 11, and the second thin grid lines 113 on the cell tabs 11 are spaced from the parallel adhesive tape 22, referring to fig. 10 and 13, in another embodiment, the parallel adhesive tape 22 is respectively connected to the second protruding ends 1131 on the two cell tabs 11, and the first thin grid lines 112 on the cell tabs 11 are spaced from the parallel adhesive tape 22.
The conductive adhesive tape 2 (parallel adhesive tape 22) in the embodiment is the circuit connecting piece mentioned in the embodiment, and by arranging the conductive adhesive tape 2, the conductive adhesive tape 2 can form electric conduction between the small battery pieces 11, so as to realize current collection; the conductive adhesive tape 2 is a flexible piece, the hardness of the conductive adhesive tape 2 is far less than that of the battery small piece 11, and the conductive adhesive tape 2 cannot generate hard contact with the battery small piece 11, so that the problem of hidden cracking of the battery small piece 11 caused by hard contact can be avoided; the conductive adhesive tape 2 has viscosity, can be directly adhered to the battery small piece 11, does not need a welding procedure, is convenient to operate, can improve the assembly efficiency on one hand, and can avoid the problem that the battery small piece 11 is hidden and cracked due to the welding procedure on the other hand; because the conductive adhesive tape 2 has viscosity and can be directly adhered to the small battery pieces 11, when the small battery pieces 11 are arranged, a reserved space is not required for placing bus bars and welding, so that the small battery pieces 11 can be arranged more tightly, the area of a solar battery assembly is reduced, and the power generation efficiency of the solar battery assembly is improved; because the small battery pieces 11 can be arranged more tightly, the sizes of parts such as the shell of the solar battery assembly can be correspondingly reduced, so that the production cost of the solar battery assembly can be reduced, and the sizes of the parts such as the shell of the solar battery assembly can be reduced, so that the overall size and weight of the solar battery assembly can be correspondingly reduced, and the transportation cost of the solar battery assembly can be reduced; the conductive adhesive tape 2 is used for circuit connection, the gram weight of the conductive adhesive tape 2 is far lower than that of a bus bar in the prior art, so that the weight of the solar cell module can be reduced; by arranging the thin grid lines which do not need to be connected with the conductive adhesive tape 2 at intervals, the thin grid lines which do not need to be connected with the conductive adhesive tape 2 in the battery small piece 11 can be insulated at intervals in a space interval mode, so that short circuit in the battery small piece 11 is avoided; the conductive adhesive tape 2 is arranged on the back side surface of the body 111, and the back surface of the body 111 is directly provided with the conductive adhesive tape 2, so that on one hand, the adhesive distribution difficulty can be reduced, and on the other hand, the conductive adhesive tape 2 is not required to be arranged between the small battery pieces 11, so that the small battery pieces 11 can be arranged more tightly, and the distance between the small battery pieces 11 is reduced.
It should be noted that, the small battery pieces 11 in the solar cell parallel unit may be arranged along the first direction or the second direction, and there are various arrangements. Referring to fig. 9 and 10, two battery cells 11 may be arranged in a first direction, and referring to fig. 12 and 13, two battery cells 11 may be arranged in a second direction.
Referring to fig. 14 and 15, the present embodiment also provides a solar cell module, where the solar cell module includes the solar cell serial unit and the solar cell parallel unit described above, and of course, referring to fig. 11, the solar cell module may include only the solar cell serial unit and not include the solar cell parallel unit, or the solar cell module may include only the solar cell parallel unit and not include the solar cell serial unit. Because the solar cell serial units and the solar cell parallel unit cell tabs 11 can be arranged more tightly, the sizes of parts such as the shell of the solar cell module can be correspondingly reduced, so that the production cost of the solar cell module can be reduced, and the sizes of parts such as the shell of the solar cell module can be reduced, so that the overall size and weight of the solar cell module can be correspondingly reduced, and the transportation cost of the solar cell module can be reduced.
Further, referring to fig. 16, in the first direction, the distance between the peripheral sides of two adjacent battery cells 11 is W1,0 mm+.w1+.1.3 mm, and as an example, W1 may be 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, that is, in the first direction, the adjacent two battery cells 11 may be attached to each other, or may be spaced apart, and the maximum spacing distance between the adjacent two battery cells 11 is 1.3mm, so as to realize a small-pitch arrangement; it can be understood that the distance between the battery cells of the conventional solar cell is between 1.5mm and 2mm, and the distance between the two adjacent battery cells 400 in the first direction of the solar cell module of the embodiment can be shortened to be between 0mm and 1.3mm, which is far smaller than that of the conventional solar cell, so that the structure of the solar cell module of the embodiment can reduce the area of the battery module and improve the power generation efficiency. Of course, in the second direction, the distance between the peripheral sides of two adjacent battery small pieces 11 may be W2,0 mm+.w2+.1.3 mm, W2 may be 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, where the values of W1 and W2 may be different, or may be the same, for example, when w1=0 mm, w2=0.5 mm is present between the peripheral sides of two adjacent battery small pieces 11 in the first direction, and when w1=0 mm, w2=0.8 mm is present between the peripheral sides of two adjacent battery small pieces 11 in the second direction, and when w1=0.8 mm is present between the peripheral sides of two adjacent battery small pieces in the second direction.
It should be noted that, when the conductive adhesive tape 2 is cut and formed by using a conductive adhesive tape, the values of W1 and W2 may be greater than 0mm, that is, a gap may exist between the small battery pieces 11, and when the conductive adhesive tape 2 is directly coated on the surface of the small battery pieces to cure and form the conductive adhesive tape 2, the values of W1 and W2 are both 0mm, that is, the small battery pieces 11 need to be attached.
Preferably, the peripheral sides of two adjacent battery cells 11 are bonded. Since the ends of the first thin grid line 112 and the second thin grid line 113 are spaced from the edges of the battery cells 11, when the two battery cells 11 are closely attached, the thin grid lines on the two battery cells 11 are not in direct contact with each other, and the short circuit problem between the battery cells 11 is not caused, so that the peripheral sides of the two adjacent battery cells 11 can be attached, and the space between the battery cells 11 is reduced.
Further, referring to fig. 4, the solar cell assembly includes the battery cells 11 arranged in a first direction and connected in series, wherein a first peripheral side 114 of one battery cell 11 is attached to a second peripheral side 115 of an adjacent battery cell 11 such that a first protruding end 1121 on one battery cell 11 is adjacent to a second protruding end 1131 on the other battery cell 11.
Referring to fig. 9, the solar cell assembly further includes the battery cells 11 arranged in parallel along the first direction, and the first peripheral sides 114 of the two battery cells 11 are attached such that the second protruding ends 1131 of the second fine grid lines 113 on the two battery cells 11 are adjacent to each other, or the second peripheral sides 115 of the two battery cells 11 are positioned opposite to each other such that the first protruding ends 1121 of the two battery cells 11 are adjacent to each other.
Referring to fig. 10, the solar cell assembly further includes the battery cells 11 arranged in the second direction and connected in series, wherein the first peripheral side 114 of one battery cell 11 is flush with the second peripheral side 115 of the other battery cell 11, so that all the first thin-grid lines 112 and the second thin-grid lines 113 on both battery cells 11 are positioned on the same line.
Referring to fig. 12 and 13, the solar cell assembly further includes the battery cells 11 arranged in parallel in the second direction, and the first peripheral sides 114 of the two battery cells 11 are aligned such that all the second protruding ends 1131 of the two battery cells 11 are positioned on the same line, or the second peripheral sides 115 of the two battery cells 11 are aligned such that all the first protruding ends 1121 of the two battery cells 11 are positioned on the same line.
In the present embodiment, the cut battery cells 11 of the double-divided battery cell 1 are identical, that is, the arrangement of the first fine grid line 112 and the second fine grid line 113 on each battery cell 11 is identical, so that the arrangement can facilitate the series connection and the parallel connection between the battery cells 11.
Further, the series adhesive tape 21 includes a first series portion 211 and a second series portion 212, the first series portion 211 and the second series portion 212 are connected with the thin grid lines on the two battery small pieces 11 respectively, of course, the parallel adhesive tape 22 may also include a first parallel portion 221 and a second parallel portion 222, the first parallel portion 221 and the second parallel portion 222 are connected with the thin grid lines on the two battery small pieces 11 respectively, in this embodiment, the series adhesive tape 21 and the parallel adhesive tape 22 are integrally formed, and by providing the series adhesive tape 21 and the parallel adhesive tape 22 to be integrally formed, on one hand, the electrical connection stability between the two battery small pieces 11 can be improved, on the other hand, the number of adhesive tapes can be reduced, the workload of cutting or coating the adhesive tape can be reduced, and further the production cost can be reduced. In other embodiments, the first serial portion 211 and the second serial portion 212 of the serial adhesive tape 21 may be independent, and both may be adhered by self-adhesion, however, the parallel adhesive tape 22 may also have a first parallel portion 221 and a second parallel portion 222, where the first parallel portion 221 and the second parallel portion 222 are adhered to the two battery small pieces 11, and the first parallel portion 221 and the second parallel portion 222 may be independent, and both may be adhered by self-adhesion.
Preferably, the center of the conductive adhesive strip 2 is aligned with the spliced edges of the two battery cells 11. Through setting up the center of conducting strip 2 and the concatenation edge alignment of two battery cells 11, that is to say, conducting strip 2 is unanimous with the bonding area of two battery cells 11, can guarantee the bonding stability of conducting strip 2 and each battery cell 11 to the maximum extent like this, avoids appearing peeling off between conducting strip 2 and the battery cell 11.
Referring to fig. 4, two battery cells 11 are arranged in a first direction, the width center of the conductive adhesive tape 2 is aligned with the splicing edge of the two battery cells 11, the maximum width of the conductive adhesive tape 2 is D,0.5D < L4, and 0.5D < L1. By setting 0.5D < L4 and 0.5D < L1, the conducting adhesive tape 2 can be separated from the thin grid line which is not required to be connected, and the short circuit caused by the contact of the conducting adhesive tape 2 and the thin grid line is avoided.
In this embodiment, the solar cell module further includes tempered glass, a glue film and a back plate, the solar cell serial unit and the solar cell parallel unit are both located in the glue film, and the glue film is located between the tempered glass and the back plate.
Referring to fig. 1 to 14, the present embodiment also provides a method for manufacturing a solar cell module, for manufacturing the solar cell module in any of the above embodiments, first, it is necessary to provide the double-divided cell sheet 1 in any of the above embodiments, including the steps of:
step 100, cutting along a cutting part 102 of the double-divided battery piece 1, and separating the double-divided battery piece 1 into battery small pieces 11;
step 200, arranging the battery small pieces 11;
step 300, forming the conductive adhesive tape 2 on the small battery pieces 11, so that the solar battery serial units are formed between the small battery pieces 11 in series, and the solar battery parallel units are formed between the small battery pieces 11 in parallel.
Through setting up the battery die 11 of arranging earlier, the shaping of shaping conductive adhesive tape 2 again, can make things convenient for the shaping of conductive adhesive tape 2, promotes production efficiency.
In the present embodiment, in the battery serial unit and the battery parallel unit, two battery tabs 11 arranged in the first direction are formed separately from the same bicell sheet 1.
Referring to fig. 7 to 9, when two battery cells 11 formed by separating the same double-divided battery cell 1 are connected in parallel, after cutting the double-divided battery cell 1, one of the battery cells 11 is rotated 180 ° so that the first peripheral side 114 of the two battery cells 11 is bonded to the first peripheral side 114 of the other battery cell 11 or the second peripheral side 115 of the two battery cells 11 is bonded, and then the conductive adhesive tape 2 is molded.
When two battery small pieces 11 formed by separating the same double-split battery piece 1 are connected in series, the two battery small pieces 11 are directly spliced after the double-split battery piece 1 is cut, and then the conductive adhesive tape 2 is formed.
Referring to fig. 11, when four battery cells 11 formed by separating two bicells 1 are all connected in series, in one embodiment, before cutting the bicells 1, one of the bicells 1 is rotated 180 °, then the bicells 1 is cut, and then the battery cells 11 are directly spliced. In another embodiment, the double-divided battery piece 1 may be cut first, then the two battery pieces 11 belonging to the same double-divided battery piece 1 are rotated 180 ° respectively, and then the battery pieces 11 are spliced.
The rotation of the battery cells 11 needs to be selected according to the connection manner between the actual battery cells 11.
The conductive adhesive tape 2 can be formed by curing conductive adhesive tape or cutting conductive adhesive tape, in one embodiment, the conductive adhesive tape 2 is formed by curing conductive adhesive tape, then the conductive adhesive tape 2 can be formed by coating conductive adhesive tape on the preset position of the small battery piece 11 after curing conductive adhesive tape, in another embodiment, the conductive adhesive tape can be cut and formed first, and then the conductive adhesive tape 2 is stuck on the preset position of the small battery piece 11.
In this embodiment, during assembly, the toughened glass of the solar cell module is inverted, then the battery small pieces 11 are arranged on the toughened glass, after the arrangement is completed, the conductive adhesive tape 2 is formed on the battery small pieces 11, so that the battery small pieces 11 are connected, then the blank and the backboard for placing the adhesive film are sequentially laminated on the battery small pieces 11, and the backboard is pressed under the high temperature condition, so that the blank of the adhesive film is heated and melted, the battery small pieces 11 are wrapped and filled in the gap between the toughened glass and the backboard, after cooling, the adhesive film is formed by solidification, and finally the whole module is turned over by 180 degrees.
In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the operation, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for providing a special meaning.
In the description herein, reference to the term "one embodiment," "an example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (10)
1. The battery small piece comprises a first peripheral side face and a second peripheral side face, a plurality of first thin grid lines and a plurality of second thin grid lines are arranged on the back face of the battery small piece, the lengths of the first thin grid lines and the second thin grid lines extend in a first direction, the first thin grid lines and the second thin grid lines are alternately arranged at intervals in a second direction, and the battery small piece is characterized in that the first thin grid lines comprise first protruding ends and first shortening ends, the second thin grid lines comprise second protruding ends and second shortening ends, the distance between the first shortening ends and the first peripheral side face is L1, the distance between the first protruding ends and the second peripheral side face is L2, the distance between the second protruding ends and the first peripheral side face is L3, the distance between the second shortening ends and the second peripheral side face is L4, L1> 0mm, and L4> 0mm.
2. The battery die of claim 1 further comprising a third peripheral side surface and a fourth peripheral side surface, the third peripheral side surface and the fourth peripheral side surface being perpendicular to the first peripheral side surface, the first peripheral side surface and the second peripheral side surface being parallel;
and/or the number of the groups of groups,
the end parts of all the first thin grid lines are flush, and the end parts of all the second thin grid lines are flush.
3. A double-divided battery piece, characterized in that a cutting part is arranged on the back surface of the double-divided battery piece, the double-divided battery piece can be cut into two battery small pieces according to claim 1 or 2 at the cutting part, and the arrangement directions of the two battery small pieces are the same.
4. A solar cell tandem unit, comprising a tandem adhesive tape and two cell tabs according to claim 1 or 2, wherein the tandem adhesive tape is a conductive adhesive tape, the tandem adhesive tape is positioned on the back of the cell tabs, the tandem adhesive tape is connected with a first protruding end on one of the cell tabs, a second thin grid line on the one of the cell tabs is spaced from the tandem adhesive tape, the tandem adhesive tape is connected with a second protruding end on the other of the cell tabs, and a first thin grid line on the other of the cell tabs is spaced from the tandem adhesive tape.
5. The parallel unit for the solar cells is characterized by comprising a parallel adhesive tape and two cell small pieces according to claim 1 or 2, wherein the parallel adhesive tape is a conductive adhesive tape, the parallel adhesive tape is positioned on the back of the cell small pieces, the parallel adhesive tape is respectively connected with the first protruding ends on the two cell small pieces, the second thin grid lines on the cell small pieces are separated from the parallel adhesive tape, or the parallel adhesive tape is respectively connected with the second protruding ends on the two cell small pieces, and the first thin grid lines on the cell small pieces are separated from the parallel adhesive tape.
6. A solar cell module comprising the solar cell series unit of claim 4 and/or the solar cell parallel unit of claim 5.
7. The solar cell assembly of claim 6, wherein two cell dice within the solar cell series unit are arranged along a first direction or two cell dice within the solar cell series unit are arranged along a second direction; the first direction is perpendicular to the second direction;
the two battery small pieces in the solar cell parallel unit are arranged along the first direction, or the two battery small pieces in the solar cell parallel unit are arranged along the second direction;
the distance between the peripheral sides of two adjacent battery chips along the first direction is W1, and W1 is more than or equal to 0mm and less than or equal to 1.3mm.
8. The solar cell module of claim 7, comprising two of the cell dies arranged in the first direction, wherein a center of a width of a conductive adhesive strip in the solar cell module is aligned with a splice edge of the two cell dies, and wherein the conductive adhesive strip has a maximum width D of 0.5D < L4 and 0.5D < L1.
9. A method of manufacturing a solar cell module, comprising the steps of:
step 100, cutting along the cutting part of the double-divided battery piece according to claim 3, and separating the double-divided battery piece into the battery small pieces according to claim 1 or 2;
step 200, arranging the battery small pieces;
step 300, a conductive adhesive tape is adhered or molded on the small battery pieces, so that the solar battery serial units of claim 4 are formed between the small battery pieces in series, and the solar battery parallel units of claim 5 are formed between the small battery pieces in parallel.
10. The method of manufacturing a solar cell module according to claim 9, wherein the solar cell series unit comprises the following molding steps: after cutting the double-divided battery pieces, directly splicing the two battery pieces, and then forming the conductive adhesive tape;
the solar cell parallel unit comprises the following forming steps: and after cutting the double-divided battery pieces, rotating one of the battery pieces by 180 degrees so as to enable the first peripheral side face/the second peripheral side face of the two battery pieces to be attached, and then forming the conductive adhesive tape.
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| CN202311658775.3A CN117577700A (en) | 2023-12-05 | 2023-12-05 | Solar cell related structure and method for manufacturing same |
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