CN212695156U

CN212695156U - Battery module and solar cell

Info

Publication number: CN212695156U
Application number: CN202021029225.7U
Authority: CN
Inventors: 涂中东; 曹国进; 余永林; 朱琛; 吕俊
Original assignee: Taizhou Lerri Solar Technology Co Ltd
Current assignee: Taizhou Longi Solar Technology Co Ltd
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2021-03-12
Anticipated expiration: 2030-06-05

Abstract

The utility model provides a battery pack and solar cell relates to the photovoltaic technology field. The battery pack includes: the battery string is formed by connecting a plurality of battery pieces in series through welding strips; the battery string is electrically connected to the bus bar through the welding strip; the battery strings electrically connected to two sides of the same bus bar are distributed in alignment; a solder strip electrically connected to the bus bar comprising: a first portion electrically connected to the bus bar and a second portion electrically connected to the bus bar of the cell, the first and second portions being collinear or not collinear; along the setting direction of the bus bars, the first parts of the adjacent welding strips which are electrically connected to the same bus bar from two sides are not overlapped. The welding strips connected to two adjacent battery strings on the same bus bar are staggered through the first part, so that the dislocation of the battery strings is replaced, the space waste in the battery assembly is reduced, the attractive effect can be improved, and the process is simple.

Description

Battery module and solar cell

Technical Field

The utility model relates to the field of photovoltaic technology, especially, relate to a battery pack and solar cell.

Background

A plurality of solar cells are connected in series by adopting solder strips to form cell strings, the cell strings are connected by adopting bus bars, and the cell strings are packaged into a cell assembly so as to improve the photoelectric conversion efficiency.

At present, two adjacent battery strings which need to be connected to the same bus bar are staggered by a certain distance, so that the problem of overhigh stress caused by the superposition of welding strips corresponding to the two adjacent battery strings at the middle bus bar is solved.

However, staggering two adjacent cell strings results in wasted space in the cell assembly and detracts from the aesthetics of the cell assembly.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery pack and solar cell aims at solving and staggers two adjacent battery strings, leads to the battery pack inner space extravagant, and influences pleasing to the eye problem.

According to the utility model discloses an aspect provides a battery pack, include: the battery string is formed by connecting a plurality of battery pieces in series through welding strips; the battery string is electrically connected to the bus bar through the welding strip;

the battery strings electrically connected to two sides of the same bus bar are distributed in alignment;

a solder strip electrically connected to the bus bar comprising: a first portion electrically connected to the bus bar and a second portion electrically connected to the bus bar of the cell, the first and second portions being collinear or not collinear;

along the setting direction of the bus bars, the first parts of the adjacent welding strips which are electrically connected to the same bus bar from two sides are not overlapped.

The embodiment of the utility model provides an in, among the battery pack, electric connection is on same busbar, and the battery cluster of busbar both sides aligns and distributes, and in battery pack promptly, the battery cluster does not have staggered space, has reduced the space waste in the battery pack, and can promote pleasing to the eye effect. A solder strip electrically connected to the bus bar comprising: the first part of electric connection on the busbar and the second part of electric connection on the main grid line of battery piece, first part and second part are collinear or not collinear, along the direction that sets up of busbar, from the first part of both sides electric connection adjacent solder strip on same busbar not overlapping, that is to say, the part of solder strip on a busbar that two adjacent battery clusters correspond does not coincide, be equivalent to with the first part of both sides electric connection adjacent solder strip on same busbar not overlapping, replaced battery cluster dislocation, not only avoided the too high problem of stress that the part coincidence of solder strip that two adjacent battery clusters correspond leads to on same busbar, and, the space waste in the battery pack has been reduced, and can promote pleasing to the eye effect. Meanwhile, the process is simple.

According to the second aspect of the present invention, there is also provided a solar cell, wherein the solar cell is divided into n cell pieces along the main grid line; n is more than or equal to 1; the slicing line is perpendicular to the main grid line; each of the battery pieces includes: a plurality of main grid lines arranged in parallel on the light facing surface and/or the backlight surface;

in each battery piece, a target line divides all the main grid lines arranged on the same surface into a first main grid line and a second main grid line; the target line is a central line parallel to the arrangement direction of the main grid line in the surface;

the n battery pieces comprise at least one asymmetric battery piece, the distribution of a first main grid line and a second main grid line of the asymmetric battery piece in a first direction is asymmetric relative to the target line, and the first direction is a direction perpendicular to the main grid lines.

The solar cell module has the same or similar beneficial effects as the solar cell.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a partial schematic view of a battery pack according to the prior art;

fig. 2 is a partial schematic view showing another battery pack according to the prior art;

fig. 3 is a schematic partial structural view of a first battery assembly in an embodiment of the present invention;

fig. 4 is a schematic partial structural view of a second battery pack according to an embodiment of the present invention;

fig. 5 is a schematic partial structural view of a third battery pack according to an embodiment of the present invention;

fig. 6 shows a schematic structural diagram of a battery plate in an embodiment of the present invention;

fig. 7 shows a schematic structural diagram of various solder strips in an embodiment of the present invention;

fig. 8 shows a schematic structural diagram of a first solar cell in an embodiment of the present invention;

fig. 9 shows a schematic structural diagram of a second solar cell in an embodiment of the present invention;

fig. 10 shows a schematic structural diagram of a third solar cell in an embodiment of the present invention;

fig. 11 shows a schematic structural diagram of a fourth solar cell in an embodiment of the present invention;

fig. 12 shows a schematic structural diagram of a fifth solar cell in an embodiment of the present invention.

Description of the figure numbering:

10-cell string, 11-bus bar, 20-bus bar, 30-solder strip, 31-first portion of solder strip, 32-second portion of solder strip, 33-connection portion.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the prior art, in the battery assembly, under the condition that the battery strings electrically connected to both sides of the same bus bar are aligned and distributed, along the arrangement direction of the bus bar, the parts of the adjacent welding strips electrically connected to the same bus bar from both sides are overlapped together, so that a local sharp bulge is caused, and the multi-point stress of the cover plate or the back plate in the assembly is easily caused to be too high, thereby causing cracks and the like.

As shown in fig. 1, fig. 1 is a partial structural view illustrating a battery pack according to the related art. Referring to fig. 1, in the case where the battery strings 10 on both sides of the bus bar 20 are aligned, along the arrangement direction of the bus bar 20, portions of adjacent solder ribbons 30 electrically connected to the same bus bar from both sides are overlapped, as shown by the portion outlined by the dashed line frame in fig. 1, and further, a local sharp protrusion is caused, which easily causes an excessive stress on a cover plate or a back plate in the assembly, and causes cracks or the like.

At present, in order to solve the problem that the parts of the adjacent solder strips 30 electrically connected to the same bus bar as shown in fig. 1 overlap to cause local sharp protrusions, which easily causes too high multi-point stress of the cover plate or the back plate in the assembly, and causes cracks, two adjacent battery strings to be connected to the same bus bar are usually staggered by a certain distance, so that the parts of the adjacent solder strips electrically connected to the same bus bar do not overlap. The inventor finds that: staggering two adjacent battery strings can cause space waste in the battery assembly and influence the appearance.

As shown in fig. 2, fig. 2 is a partial structural view illustrating another battery pack according to the related art. Referring to fig. 2, the battery string 10 on the left of the bus bar 20 in fig. 2 is offset downward, and the battery string 10 on the right of the bus bar 20 in fig. 2 is offset upward by a distance w1, where w1 is greater than 0. Therefore, the parts of the adjacent welding strips electrically connected to the same bus bar are not overlapped. However, staggering two adjacent cell strings can lead to wasted space in the cell assembly and affect the appearance.

Begin to describe below battery pack and solar cell of the embodiment of the utility model, the utility model discloses battery pack and solar cell of embodiment can solve stagger two adjacent battery strings, lead to the extravagant space in the battery pack, and influence pleasing to the eye problem.

Fig. 3 shows a schematic partial structure diagram of a first battery assembly in an embodiment of the present invention. Fig. 4 shows a schematic partial structure diagram of a second battery assembly in an embodiment of the present invention. In an embodiment of the present invention, referring to fig. 3 or 4, the battery module includes: at least two battery strings 10, wherein the battery strings 10 are formed by connecting a plurality of battery sheets in series through welding strips 30. The battery string 10 is electrically connected to the bus bar 20 via the solder ribbon 30.

Referring to fig. 3 or 4, the cell strings 10 electrically connected to both sides of the same bus bar 20 are aligned. As shown in fig. 4, the battery string 10 on the left side of the bus bar 20 is flush with the battery string on the right side of the bus bar 20 in fig. 4, and is offset by a distance of 0. In battery pack promptly, the battery cluster does not have staggered space, has reduced the space waste in the battery pack, and can promote pleasing to the eye effect.

Referring to fig. 3, a solder ribbon 30 electrically connected to the bus bar 20 includes: a first portion 31 electrically connected to the bus bar 20 and a second portion 32 electrically connected to the busbar of the cell, the first and second portions being co-linear or non-co-linear. It should be noted that the arrangement positions of the main grid lines on each cell in the cell string correspond to the second portions 32 of the solder strips 30 electrically connected to the main grid lines of the cell. As shown in fig. 3, a solder ribbon 30 is electrically connected to the bus bar 20 in a collinear manner with a first portion 31 and a second portion 32 electrically connected to the busbar of the cell.

First portions of adjacent solder strips electrically connected to the same bus bar from both sides do not overlap in the arrangement direction of the bus bars. That is, the part of the solder strip that two adjacent battery strings correspond on a busbar does not coincide, is equivalent to with the first part of both sides electric connection adjacent solder strip on same busbar not overlap, has replaced the battery string dislocation, has not only avoided the too high problem of stress that the part coincidence of the solder strip that two adjacent battery strings correspond leads to on same busbar, moreover, has reduced the space waste in the battery pack, and can promote pleasing to the eye effect.

Referring to fig. 3, along the setting direction of the bus bar 20, the first portions 31 of the adjacent upper and lower solder strips 30 electrically connected to the same bus bar 20 from both sides are not overlapped, so that the problem of overhigh stress caused by the overlapping of the portions of the solder strips corresponding to the two adjacent battery strings on the same bus bar is avoided, the space required for staggering the battery strings is shared, the waste of the space in the battery assembly is reduced, and the attractive effect can be improved. Meanwhile, the process is simple.

The embodiment of the utility model provides an in, electric connection is in the battery cluster of same busbar both sides and is distributed by the alignment, along the setting direction of busbar, from the not overlap of the first part in both sides electric connection adjacent welding area on same busbar, can improve the utilization ratio 0.1% in battery pack space, and battery pack is more pleasing to the eye.

Optionally, along the arrangement direction of the bus bars, the distance between the first portions of the adjacent solder strips electrically connected to the same bus bar from both sides may be greater than or equal to the width of the solder strip, so that it can be ensured that the first portions of the adjacent solder strips on the same bus bar are not overlapped completely or are not overlapped completely.

For example, referring to fig. 5, fig. 5 is a schematic view of a partial structure of a third battery assembly in an embodiment of the present invention. Referring to fig. 5, a first portion 31 of a solder ribbon 30 electrically connected to the bus bar 20 and a second portion 32 electrically connected to the bus bars of the cell are not collinear. The distance d2 between the first portions 31 of adjacent solder strips 30 electrically connected from both sides to the same bus bar along the direction of bus bar placement is greater than or equal to the width of the solder strip 30, ensuring that the first portions of adjacent solder strips on the same bus bar do not overlap at all or do not overlap at all.

Alternatively, in the case where the first portion and the second portion are not collinear, the first portion and the second portion are connected by a connecting portion in the solder ribbon. Namely, in one solder strip: the first portion electrically connected to the bus bar and the second portion electrically connected to the bus bar of the cell are not collinear. That is, in one solder strip: the first part of electric connection on the busbar and the second part of electric connection on the main grid line of battery piece have the dislocation, and the dislocation part passes through the connecting portion to be connected, has shared from this and has needed the staggered space of battery cluster, has reduced the space waste in the battery pack, and can promote pleasing to the eye effect.

For example, referring to fig. 5, in the battery module, in one solder ribbon 30: the first portion 31 electrically connected to the bus bar 20 and the second portion 32 electrically connected to the bus bar of the cell are not collinear, and the first portion 31 and the second portion 32 are connected by a connection portion 33.

Optionally, in a direction parallel to the bus bar arrangement direction, the length of the connecting portion may be 0 to 20mm, which can ensure that the first portions of the adjacent solder strips on the same bus bar are completely misaligned or completely misaligned.

It should be noted that the arrangement position of the main grid lines on each cell in the cell string is not particularly limited. The arrangement position of the main grid line on the cell slice is opposite to the second part of the welding strip which is electrically connected to the main grid line of the cell slice.

For example, referring to fig. 6, fig. 6 is a schematic structural diagram of a battery cell in an embodiment of the present invention. The cell segments shown in fig. 6 can be used in series via a solder ribbon having a first portion electrically connected to the bus bar and a second portion electrically connected to the bus bar of the cell segment that are not collinear, resulting in a cell assembly as shown in fig. 5. A plurality of main grid lines 11 are arranged in parallel on the light facing surface and/or the backlight surface of the battery piece 1. The bus bar line may include a first electrode bus bar line and a second electrode bus bar line, wherein the first electrode bus bar line and the second electrode bus bar line have opposite polarities. The target line L1, which is located on the same surface and parallel to the arrangement direction of the main grid lines 11, divides all the main grid lines on the surface of the cell 1 into: a first main gate line to the left of L1 and a second main gate line to the right of L1. The first main gate line located to the left of the target line L1 and the second main gate line located to the right of the target line L1 are symmetrical with respect to the target line L1, that is, the main gate lines are not shifted to the left or right in a direction perpendicular to the main gate lines 11.

The battery string formed by the battery pieces shown in fig. 6 is electrically connected to the bus bar through the welding strips with the first part and the second part being non-collinear, so that the battery assembly shown in fig. 5 is obtained, and the first part electrically connected to the bus bar and the second part electrically connected to the main grid lines of the battery pieces are staggered, so that the staggered space of the battery string is shared, the waste of the space in the battery assembly is reduced, and the attractive effect can be improved. And the first part and the second part in the welding strip are only required to be adjusted to be not collinear, so that the process is simple.

In one solder strip: in the case where the first portion electrically connected to the bus bar and the second portion electrically connected to the bus bar of the battery cell are not collinear, the first portion and the second portion in one solder ribbon may be connected by a connection portion.

Optionally, the connecting portion has a line segment or a bent shape. The line or bend may be shaped to form an angle of 90 ° with the first or second portion, or any other suitable angle. In the embodiment of the present invention, this is not particularly limited.

Fig. 7 shows a schematic structural diagram of various solder strips in an embodiment of the present invention. As seen in fig. 7, from left to right, first and second portions of the first and second solder strips may be located at opposite ends, respectively, the first and second portions being parallel. The connecting part between the first part and the second part is a line segment. From left to right, in the first solder strip, the line segment forms an angle of 90 ° with the first portion or the second portion. From left to right in the second solder strip, the angle between the line segment and the first portion or the second portion is greater than 90 °. In fig. 7, from left to right, the third to sixth solder strips have a bent shape at the joint between the first portion and the second portion.

Optionally, under the condition that the first portion and the second portion are collinear, the bus bars of the two battery pieces on two sides, which are electrically connected to the same bus bar, are staggered in the bus bar direction. Namely, in one solder strip: under the condition that electric connection does not have the dislocation with the second part of electric connection on the main grid line of battery piece on the first part on the busbar, the main grid line of both sides battery piece of electric connection on same busbar distributes along staggering in the busbar direction, be equivalent to the dislocation of the main grid line of the battery piece of electric connection in same busbar both sides, the battery cluster dislocation has been replaced, the too high problem of stress that the partial coincidence of the welding strip that has not only avoided two adjacent battery clusters to correspond leads to on same busbar, and furthermore, the space waste in the battery pack has been reduced, and can promote pleasing to the eye effect.

For example, referring to FIG. 3, in one solder strip 30: in the case that the first portion 31 electrically connected to the bus bar 20 and the second portion 32 electrically connected to the main grid line of the battery piece are partially collinear, the second portion electrically connected to the main grid line of the battery piece coincides with the position projection of the main grid line on the battery piece, that is, the position of the main grid line on the battery piece can be represented by the second portion 32 electrically connected to the main grid line of the battery piece in 1 solder strip 30. In fig. 3, the bus bars of the two battery pieces electrically connected to the same bus bar 20 are staggered along the bus bar 20 by a distance d 1.

Optionally, the main grid lines of the battery pieces on two sides electrically connected to the same bus bar 20 are distributed in a staggered manner in the direction along the bus bar 20, and the staggered distance d1 may be greater than or equal to the width of the solder strip 30, so that it can be ensured that the first portions of the adjacent solder strips on the same bus bar are completely misaligned or completely misaligned.

The embodiment of the present invention provides a solar cell, which is divided into n cell pieces along the direction of the main grid line, wherein n is greater than or equal to 1. In the case where n is 1, that is, the solar cell is not divided into individual pieces and is used as a cell piece. In the case that n is larger than 1, the solar cell is divided into a plurality of cell pieces. The slicing line is perpendicular to the main grid line.

For example, referring to fig. 8, fig. 8 shows a schematic structural diagram of a first solar cell in an embodiment of the present invention. The solar cell is not sliced.

Referring to fig. 8, each of the battery cells includes: and a plurality of main grid lines 11 arranged in parallel on the light facing surface and/or the backlight surface. The embodiment of the present invention is not limited to this embodiment. The bus bar line may include a first electrode bus bar line and a second electrode bus bar line, wherein the first electrode bus bar line and the second electrode bus bar line have opposite polarities. All the main grid lines arranged on the same surface are all the main grid lines arranged on the light facing surface or are all the main grid lines arranged on the backlight surface. The target line L1 is a center line parallel to the direction in which the bus bars are arranged on the same surface. For example, referring to fig. 8, if the backlight surface of the battery piece is characterized in fig. 8, the broken line indicated by L1 may be a center line parallel to the direction in which the bus bar 11 is disposed on the backlight surface of the battery piece. In each cell, the target line divides all the main gate lines arranged on the same surface into a first main gate line and a second main gate line, that is, all the main gate lines on the same side of the target line are first main gate lines, and all the main gate lines on the other side of the target line are second main gate lines. As shown in fig. 8, a target line L1 parallel to the arrangement direction of the grid lines 11 on the backlight surface of the battery slice divides all the grid lines on the backlight surface of the battery slice into: a first main gate line to the left of L1 and a second main gate line to the right of L1.

The distribution of the first and second main grid lines in a first direction is asymmetrical relative to the target line, and the first direction is a direction perpendicular to the main grid lines. That is, the asymmetric cell, all the main gate lines on the same side of the target line, and all the main gate lines on the other side of the target line are asymmetric in the direction perpendicular to the main gate lines.

As shown in fig. 8, the first main gate line located to the left of the target line L1 and the second main gate line located to the right of the target line L1 are asymmetrical with respect to the target line L1 in a direction perpendicular to the main gate line 11, that is, the main gate lines are shifted to the left or right in the direction perpendicular to the main gate line 11. As shown in fig. 8, a first distance d3 is between the first main gate line closest to the target line L1 and the target line L1, and a second distance d4 is between the second main gate line closest to the target line and the target line L1. The first distance d3 is not equal to the second distance d 4.

The embodiment of the utility model provides an in, lie in same surface in the asymmetric battery piece, with the parallel target line of direction that sets up of main grid line, will set up all main grid lines that will set up in same surface and divide into first main grid line and second main grid line, in the direction perpendicular with main grid line, about above-mentioned target line asymmetry, promptly, set up in the asymmetric battery piece in the main grid line of same surface and not about this target line mirror symmetry. In the battery cluster, weld the area setting on main gridlines, and then the connection that this asymmetric battery piece formed from this is on same busbar, along the welding area in the battery cluster of the both sides of busbar also stagger the above-mentioned asymmetric staggered distance that corresponds from this, shared the space that need stagger the battery cluster from this, reduced the space waste in the battery pack, and can promote pleasing to the eye effect. Meanwhile, the problem of overhigh stress caused by the partial overlapping of the welding strips corresponding to the two adjacent battery strings on the same bus bar is also avoided.

Optionally, a first distance is formed between the first main gate line closest to the target line and the target line, and a second distance is formed between the second main gate line closest to the target line and the target line. The first distance is different from the second distance. The minimum value of the first distance and the second distance can be larger than or equal to the width of a solder strip for subsequently connecting adjacent solar cells in series, and further, the solder strips on two sides of the bus bar of the cell string formed by the asymmetric cell are not overlapped completely or not overlapped completely.

For example, referring to fig. 8, a first distance d3 is between a first main gate line closest to the target line L1 and the target line L1, and a second distance d4 is between a second main gate line closest to the target line and the target line L1. The first distance d3 is not equal to the second distance d 4. The minimum value of the first distance d3 and the second distance d4 is larger than or equal to the width of the solder strip for connecting the adjacent solar cells in series. When the battery piece forming assembly is used, the battery pieces on one side of the bus bar are rotated by 180 degrees, grid lines of the battery pieces on two sides of the bus bar can be staggered, and welding strips are prevented from being overlapped during welding.

Optionally, n is an even number, that is, in the case of an even number of cell slices obtained after the solar cell is sliced, the solar cell without slicing includes an odd number of slicing lines. The slicing line may be a position where the solar cell is subsequently sliced. For example, referring to fig. 9, fig. 9 shows a schematic structural diagram of a second solar cell in an embodiment of the present invention. The solar cell in fig. 9 includes 1 splitting line L2, and the solar cell shown in fig. 9 is split along the splitting line L2 to obtain 2 cells. For another example, referring to fig. 10, fig. 10 shows a schematic structural diagram of a third solar cell in an embodiment of the present invention. The solar cell shown in fig. 10 includes 3 splitting lines L2, and for the solar cell shown in fig. 10, 4 cell pieces are obtained after splitting along the 3 splitting lines L2.

And the central slicing line positioned in the odd slicing lines divides the silicon substrate of the solar cell which is not sliced into a first part and a second part, and the central slicing line is the slicing line positioned in the middle of the odd slicing lines. For example, referring to fig. 9, there is only one slicing line L2, the one slicing line L2 is a central slicing line, and the one slicing line L2 divides the silicon substrate of the solar cell that is not sliced into a first portion located above the slicing line L2 and a second portion located below the slicing line L2, and the first portion and the second portion are symmetrical with respect to the one slicing line L2. For example, referring to fig. 10, there are 3 slicing lines L2, and the slicing line L2 located at the center of the 3 slicing lines L2 is a central slicing line, and the central slicing line divides the silicon substrate of the solar cell that is not sliced into a first portion located above the central slicing line and a second portion located below the central slicing line, and the first portion and the second portion are symmetrical about the central slicing line.

The main grid lines of the battery pieces on the same side of the central splitting line are distributed in an aligned mode in a first direction perpendicular to the main grid lines. That is, of the bus bars located in the first portion of the silicon substrate, bus bars adjacent in a direction parallel to the dividing line are aligned. And the main grid lines positioned in the second part of the silicon substrate are aligned and distributed in the direction parallel to the slicing lines. For example, referring to fig. 10, the main grid lines of the first part of 2 battery pieces above the central dividing line are aligned and distributed in the direction indicated by the dividing line L2 as outlined by the dashed line. Of the main grid lines of the second part of 2 battery pieces located below the central slicing line, as outlined by the dashed line frame, the adjacent main grid lines are aligned and distributed in the direction indicated by the slicing line L2.

The main grid lines of the battery pieces positioned on two sides of the central piece dividing line are distributed in a staggered mode in a first direction parallel to the piece dividing line. Namely, the main grid lines in the first part of the silicon substrate and the main grid lines in the second part of the silicon substrate are distributed in a staggered manner in the direction parallel to the slicing lines. It should be noted that the staggered distribution distance can also be greater than or equal to the width of the subsequent welding strip for serially connecting the adjacent battery pieces, and then the battery pieces in the even number of battery pieces are connected to the same bus bar, and the welding strips in the battery strings along the two sides of the bus bar are staggered by the staggered distribution distance corresponding to the staggered distribution, so that the space required for staggering the battery strings is shared, the problem of overhigh stress caused by the partial overlapping of the welding strips corresponding to the two adjacent battery strings on the same bus bar is solved, the space waste in the battery assembly is reduced, and the attractive effect can be improved.

For example, referring to fig. 9, the main grid lines of the battery pieces located on both sides of the splitting line L2 are distributed in a staggered manner in the first direction parallel to the splitting line, and the distance of the staggered distribution is d 5. For example, referring to fig. 10, the main grid lines of the battery pieces located at both sides of the central splitting line are staggered in two adjacent main grid lines 11 in the first direction parallel to the splitting line L2, and the staggered distribution distance is d 5.

Optionally, n is an even number, that is, in the solar cell, in the case of an even number of cell slices obtained after the solar cell is sliced, a staggered distance in which the main grid lines of the cell slices located at both sides of the central slicing line are staggered in the first direction may be greater than or equal to a width of a solder strip subsequently used for serially connecting adjacent solar cell slices, and then the solder strips located at both sides of the bus bar of the cell string formed by the asymmetric cell slices are completely misaligned or completely misaligned.

For example, referring to fig. 9 or 10, the two adjacent main grid lines 11 of the cell sheets located at both sides of the central slicing line are staggered in the first direction parallel to the slicing line L2, the staggered distribution distance is d5, and d5 is greater than or equal to the width of the solder strip for connecting the adjacent solar cell sheets in series.

Optionally, in a case where n is an even number, that is, in a case where the solar cell is divided into an even number of cells, the solar cell that is not divided includes an odd number of dividing lines. The slicing line may be a position where the solar cell is subsequently sliced. The solar cell without the sheet can also comprise: the main grid lines of two adjacent battery pieces are distributed in a staggered mode in the first direction, and the main grid lines of two secondary adjacent battery pieces are distributed in an aligned mode in the first direction; and 1 battery piece is clamped between two next adjacent battery pieces, and the first direction is vertical to the main grid line and parallel to the splitting line. And then by the connection that the battery piece in the above-mentioned even number battery piece formed on same busbar, the solder strip in the battery cluster of both sides along the busbar also staggers the above-mentioned staggered distance that distributes correspondingly that staggers from this, has shared the space that needs to stagger the battery cluster from this, has not only avoided the too high problem of stress that the part coincidence of the solder strip that two adjacent battery clusters correspond on same busbar leads to, has reduced the space waste in the battery pack, and can promote pleasing to the eye effect.

For example, referring to fig. 11, fig. 11 shows a schematic structural diagram of a fourth solar cell in an embodiment of the present invention. The solar cell shown in fig. 11 includes 3 splitting lines L2, and is split into 4 cell pieces. From top to bottom, the main grid lines of the two battery slices located at two sides of the first slicing line L2 are distributed in a staggered manner in the first direction. From top to bottom, the main grid lines of the two battery pieces located at two sides of the second splitting line L2 are distributed in a staggered manner in the first direction. From top to bottom, the main grid lines of the two battery pieces located at two sides of the third splitting line L2 are distributed in a staggered manner in the first direction.

And 1 battery piece is clamped between two next adjacent battery pieces. For example, in fig. 11, from top to bottom, the first cell and the third cell may be two next-adjacent cells, sandwiching the second cell. From top to bottom, second battery piece and fourth battery piece can be two adjacent battery pieces next time, and the centre presss from both sides and holds the third battery piece.

Referring to fig. 11, from top to bottom, the main grid lines 11 of the first cell and the third cell of the two next adjacent cells are aligned and distributed in a direction parallel to the slicing line L2. From top to bottom, the main grid lines 11 of the second cell and the fourth cell of the two next adjacent cells are aligned and distributed in the direction parallel to the slicing line L2.

Similarly, n is an even number, that is, in the case of an even number of cell slices obtained after the solar cell is sliced, in the solar cell, the staggered distance of the main grid lines of two adjacent cell slices staggered and distributed in the first direction may be greater than or equal to the width of the solder strips for subsequently connecting the adjacent solar cell slices in series, and further, the solder strips on both sides of the bus bar of the cell string formed by the asymmetric cell slices are completely misaligned or completely misaligned.

For example, referring to fig. 11, the main grid lines of two adjacent solar cells are staggered in the first direction by a staggered distance d5, and d5 is greater than or equal to the width of a solder strip subsequently used for connecting the adjacent solar cells in series.

Optionally, n is an even number, that is, in the case of an even number of cells obtained after the solar cell is divided, the layout of the main grid lines of all the cells is centrosymmetric with respect to the center point of the solar cell. Furthermore, after part of the battery pieces are rotated by 180 degrees, the battery pieces can be completely consistent with the adjacent battery pieces, and the manufacturing process is simple.

For example, referring to the solar cells shown in fig. 9, 10, and 11, the layout of the bus bars 11 of all the cells is centrosymmetric with respect to the center point of the solar cell.

Optionally, n is greater than 1, and n is an odd number, that is, after the solar cell is diced, odd number of cells greater than 1 are obtained. In the solar cell which is not sliced, all the main grid lines arranged on the same surface are centrosymmetric about the center point of the surface of the solar cell. And then by the connection that the battery piece in the above-mentioned odd number battery piece formed on same busbar, the solder strip in the battery cluster of both sides along the busbar also staggers the above-mentioned staggered distance that distributes correspondingly that staggers from this, shared the space that needs to stagger the battery cluster from this, not only avoided the too high problem of stress that the part coincidence of the solder strip that two adjacent battery clusters correspond on same busbar leads to, reduced the space waste in the battery pack, and can promote pleasing to the eye effect.

Optionally, n is greater than 1, and n is an odd number, in the odd number of cells, the arrangement of the main grid lines of the middle cell in the first direction is symmetrical with respect to the target line. The cell sheet positioned in the middle is the most central cell sheet in odd number of cell sheets in the solar cell. The arrangement of the main grid lines of the middle cell in a first direction perpendicular to the main grid lines is symmetrical about a target line of the cell. The target lines of the cells are: and the central line is parallel to the arrangement direction of the main grid lines in the surface of the main grid lines of the battery piece. And then by the connection that the battery piece in the above-mentioned odd number battery piece formed on same busbar, the solder strip in the battery cluster of both sides along the busbar also staggers the above-mentioned staggered distance that distributes correspondingly that staggers from this, shared the space that needs to stagger the battery cluster from this, not only avoided the too high problem of stress that the part coincidence of the solder strip that two adjacent battery clusters correspond on same busbar leads to, reduced the space waste in the battery pack, and can promote pleasing to the eye effect.

For example, referring to fig. 12, fig. 12 shows a schematic structural diagram of a fifth solar cell in an embodiment of the present invention. The solar cell shown in fig. 12 includes 2 splitting lines L2, and 3 cells are obtained by splitting the solar cell shown in fig. 12 along 2 splitting lines L2.

Referring to fig. 12, among the 3 battery pieces, the second battery piece from top to bottom is the battery piece located in the middle. The arrangement of the main grid lines of the middle cell in the first direction parallel to the splitting line is symmetrical about the target line of the second cell.

For example, when n is greater than 1 and is an odd number, the grid lines of the cell at the edge and the grid lines of the cell at the middle are distributed in a staggered manner in the first direction in the n cells. The edge is divided into two battery pieces respectively positioned at two ends. The battery piece in the middle is: the battery piece in the middle of odd number battery piece, and then the connection that forms by the battery piece in the above-mentioned odd number battery piece is on same busbar, the solder strip in the battery cluster along the both sides of busbar also staggers the above-mentioned staggered distance that staggers the distribution and correspond from this, the space that needs to stagger the battery cluster has been shared from this, the problem of the too high stress that has not only avoided the part coincidence of the solder strip that two adjacent battery clusters correspond on same busbar to lead to has reduced the space waste in the battery pack, and can promote pleasing to the eye effect.

For example, referring to fig. 12, from top to bottom, the first cell piece and the third cell piece may be cell pieces located at the edges. The second cell piece may be a cell piece located in the middle. The main grid lines of the first cell piece and the main grid lines of the second cell piece are distributed in a staggered mode in a first direction parallel to the slicing line L2. The main grid lines of the third cell piece and the main grid lines of the second cell piece are distributed in a staggered mode in the first direction parallel to the slicing line L2.

Optionally, when n is greater than 1 and is an odd number, the staggered distance between the main grid line of the cell piece located at the edge and the main grid line of the cell piece located in the middle in the first direction in staggered distribution may also be greater than or equal to the width of the solder strip subsequently used for connecting adjacent cell pieces in series, and then the solder strips located at the bus bar of the cell pieces in the odd number of cell pieces form a cell string, which is completely misaligned or completely misaligned.

For example, referring to fig. 12, the main grid lines of the first cell and the main grid lines of the second cell are distributed in a staggered manner in a first direction parallel to the slicing line L2, and the staggered distance d5 is greater than or equal to the width of the solder strips for connecting the adjacent cells in series. It should be noted that the embodiment of the present invention provides a solar cell's main grid line and the second portion electric connection of solder strip, the first portion and the busbar electric connection of solder strip, and the above-mentioned first portion and the above-mentioned second portion can be collinear.

The embodiment of the utility model provides an in, lie in same surface in the asymmetric battery piece, with the parallel target line of direction that sets up of main grid line, will set up all main grid lines that will set up in same surface and divide into first main grid line and second main grid line, in the direction perpendicular with main grid line, about above-mentioned target line asymmetry, promptly, set up in the asymmetric battery piece in the main grid line of same surface and not about this target line mirror symmetry. It should be noted that, for the solar cell according to the embodiment of the present invention, the main grid lines of two adjacent cells may be staggered in the first direction perpendicular to the main grid lines by rotating the cells by 180 degrees or adjusting the arrangement sequence of the cells, and the solder strips in the cell strings are disposed on the main grid lines, so that the cells are connected to the same bus bar, and the solder strips in the cell strings along the two sides of the bus bar are staggered by the staggered distance corresponding to the staggered distribution, thereby sharing the space where the cell strings need to be staggered, which not only avoids the problem of too high stress caused by the partial overlapping of the solder strips corresponding to two adjacent cell strings on the same bus bar, reduces the space waste in the cell module, and can improve the aesthetic effect. The embodiment of the utility model provides an in, battery pack and solar cell's part can the cross reference, and can reach the same or similar beneficial effect, avoids the repetition, and here is no longer repeated.

The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, and all of them fall within the protection scope of the present invention.

Claims

1. A battery assembly, comprising: the battery string is formed by connecting a plurality of battery pieces in series through welding strips; the battery string is electrically connected to the bus bar through the welding strip;

2. The battery assembly of claim 1, wherein the first portion and the second portion of the solder ribbon are connected by a connecting portion in a case where the first portion and the second portion are not collinear.

3. The battery assembly of claim 2, wherein the connecting portion has a shape of a line segment or a bend.

4. The battery pack according to claim 1, wherein, in the case where the first portion and the second portion are collinear, the bus bars of the two side battery pieces electrically connected to the same bus bar are staggered in the bus bar direction.

5. The solar cell is characterized in that the solar cell is divided into n cell pieces along the direction of a main grid line; n is more than or equal to 1; the slicing line is perpendicular to the main grid line; each of the battery pieces includes: a plurality of main grid lines arranged in parallel on the light facing surface and/or the backlight surface;

6. The solar cell according to claim 5, wherein the main grid lines of two adjacent cells are staggered in the first direction by rotating the cells by 180 ° or adjusting the arrangement sequence of the cells.

7. The solar cell of claim 6, wherein in the case where n is an even number, an odd number of scribe lines are included in the solar cell;

a central slicing line located in the odd-numbered slicing lines, dividing the silicon substrate of the solar cell into a first portion and a second portion;

in the solar cell, main grid lines of all the cells positioned on the same side of the central splitting line are distributed in a first direction in an aligned mode;

in the solar cell, the main grid lines of the cell pieces positioned on two sides of the central piece line are distributed in a staggered mode in the first direction.

8. The solar cell according to claim 6, wherein in the case that n is an even number, the main grid lines of two adjacent cell pieces are distributed in a staggered manner in the first direction; the main grid lines of two secondary adjacent battery pieces are distributed in a first direction in an aligned mode; and 1 battery piece is clamped between the two next adjacent battery pieces.

9. The solar cell of claim 7 or 8, wherein the arrangement of the busbar lines of all the cells is centrosymmetric about the center point of the solar cell.

10. The solar cell according to claim 5 or 6, wherein in the case where n is greater than 1 and is an odd number, all the bus bars disposed on the same surface in the solar cell are centrosymmetric with respect to a center point of the surface of the solar cell.

11. The solar cell of claim 10, wherein the arrangement of the busbar of the middle cell in the first direction is symmetrical with respect to the target line thereof among the odd number of cells.