Solar cell, solar cell series-parallel unit, assembly and manufacturing method thereof

Abstract

The present invention discloses a battery cell, a solar cell series-parallel unit, a component and a manufacturing method thereof. At least two wiring areas are arranged on the back of the battery cell along a first direction, a cutting area is arranged between two adjacent wiring areas, a first fine grid line and a second fine grid line are arranged in the wiring area, a distance between the first shortened end and the wiring edge is L1, a distance between the first protruding end and the wiring edge is L2, a distance between the second protruding end and the wiring edge is L3, a distance between the second shortened end and the wiring edge is L4, L1>L3>0mm, L4>L2>0mm; along the first direction, the first fine grid line in at least one wiring area is aligned with the second fine grid line in another wiring area. The first fine grid line in at least one wiring area is aligned with the second fine grid line in another wiring area, so that the conductive connection between the battery chips obtained after the battery cell is cut can be facilitated, and the difficulty of the assembly process can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of solar power generation, and in particular to a solar cell, a solar cell series unit, a solar cell parallel unit, a solar cell module and a manufacturing method of the solar cell module. Background Art

[0002] Conventional solar cells use a main grid design, and solar cell modules use solder strips and bus bars to complete circuit connections. Because the cells have hard contact and hot welding during the manufacturing process, the risk of hidden cracks is higher; at the same time, the use of bus bars increases the module area, affecting the module cost and power generation efficiency; the main grid design increases the consumption of silver paste, increasing the cost of cells and modules.

[0003] A solar cell module includes a plurality of small battery sheets, on which a main grid line and a plurality of fine grid lines are arranged, wherein the negative main grid line is connected to the negative fine grid line, and the positive main grid line is connected to the positive fine grid line. To avoid contact between the positive and negative electrodes inside the battery sheets, insulating glue needs to be arranged between the negative main grid line and the positive fine grid line, and insulating glue also needs to be arranged between the positive main grid line and the negative fine grid line. The arrangement of the insulating glue not only increases the occupation of the internal space of the solar cell module by the non-power generation structure, but also increases the production steps of the solar cell module, which is not conducive to improving the power generation efficiency of the solar cell module, nor is it conducive to controlling the production cost. Summary of the invention

[0004] An object of an embodiment of the present invention is to provide a battery cell with low cost and low risk of hidden cracks in the battery cells obtained by cutting.

[0005] Another object of the embodiments of the present invention is to provide a solar cell series unit, a solar cell parallel unit and a solar cell assembly, which have good quality and low cost.

[0006] Another object of the embodiments of the present invention is to provide a method for manufacturing a solar cell assembly with high production efficiency.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] In a first aspect, a battery cell is provided, wherein at least two wiring areas are arranged on the back side of the battery cell along a first direction, a cutting position is arranged between two adjacent wiring areas, and the battery cell can be separated into at least two battery small pieces along the straight line where the cutting position is located, a first fine grid line and a second fine grid line are arranged in the wiring area, the first fine grid line and the second fine grid line have opposite polarities, the lengths of the first fine grid line and the second fine grid line both extend along the first direction, and the first fine grid line and the second fine grid line are alternately arranged at intervals along the second direction, the wiring area has two wiring edges, the two wiring edges are arranged at intervals along the first direction, the first fine grid line has a first protruding end and a first shortened end, the second fine grid line has a second shortened end and a second protruding end, the first protruding end and the second shortened end in the same wiring area are close to the same wiring edge, the distance between the first shortened end and the wiring edge is L1, the distance between the first protruding end and the wiring edge is L2, the distance between the second protruding end and the wiring edge is L3, and the distance between the second shortened end and the wiring edge is L4, L1>L3>0mm, L4>L2>0mm;

[0009] Along the first direction, the first thin gate lines in at least one of the wiring regions are aligned with the second thin gate lines in another of the wiring regions.

[0010] As a preferred solution for the battery cell, the battery cell is a two-piece battery cell, and the two-piece battery cell can be separated into two battery small pieces, the two battery small pieces are respectively a first small piece and a second small piece, and the first protrusion on the first small piece is close to the second protrusion on the second small piece.

[0011] As a preferred solution of the battery cell, the battery cell is a four-piece battery cell, and the four-piece battery cell can be separated into four battery small pieces, and the four battery small pieces are respectively a third small piece, a fourth small piece, a fifth small piece and a sixth small piece.

[0012] Along the first direction, the first thin gate line on the third small piece is aligned with the first thin gate line on the fourth small piece, and the first shortened end on the third small piece is close to the first shortened end on the fourth small piece.

[0013] Along the first direction, the first thin grid line of the fourth small piece is aligned with the second thin grid line of the fifth small piece, and the first protruding end of the fourth small piece is close to the second shortened end of the fifth small piece.

[0014] Along the first direction, the second fine gate lines of the fifth small piece are aligned with the second fine gate lines of the sixth small piece, and the second protruding end of the fifth small piece is close to the second protruding end of the sixth small piece.

[0015] In a second aspect, a solar cell series unit is provided, comprising a series rubber strip and at least two battery chips, wherein the battery chips are cut and formed by the above-mentioned battery chips, the series rubber strip is a conductive rubber strip, and two adjacent battery chips are connected by the series rubber strip, the series rubber strip is located on the back of the battery chips, the series rubber strip is connected to the first protruding end on one of the battery chips, and the second fine grid line on one of the battery chips is spaced from the series rubber strip, the series rubber strip is connected to the second protruding end on another battery chip, and the first fine grid line on the other battery chip is spaced from the series rubber strip.

[0016] In a third aspect, a solar cell parallel unit is provided, comprising a parallel rubber strip and at least two battery chips, wherein the battery chips are cut and formed by the above-mentioned battery chips, and the parallel rubber strip is a conductive rubber strip, which connects two adjacent battery chips, and is located on the back of the battery chips. The parallel rubber strip is respectively connected to the first protruding ends on the two battery chips, and the second fine grid lines on the battery chips are spaced from the parallel rubber strip, or the parallel rubber strip is respectively connected to the second protruding ends on the two battery chips, and the first fine grid lines on the battery chips are spaced from the parallel rubber strip.

[0017] In a fourth aspect, a solar cell assembly is provided, comprising the above-mentioned solar cell series connection unit and / or the above-mentioned solar cell parallel connection unit.

[0018] As a preferred solution of the solar cell assembly, along the first direction, the distance between the circumferential side surfaces of two adjacent cell pieces is W1, 0mm≤W1≤1.3mm.

[0019] As a preferred solution of a solar cell assembly, it includes two small battery pieces arranged along the first direction, the width center of the conductive strip in the solar cell assembly is aligned with the splicing edges of the two small battery pieces, and the maximum width of the conductive strip is D, 0.5D<L4, 0.5D<L1.

[0020] In a fifth aspect, a method for manufacturing a solar cell assembly is provided, comprising the following steps:

[0021] Step 100, cutting along the cutting position of the battery sheet to separate the battery sheet into a plurality of small battery sheets;

[0022] Step 200, arranging the battery chips;

[0023] Step 300: Paste or mold conductive adhesive strips on the battery chips to connect the battery chips in series to form the above-mentioned solar cell series unit, and connect the battery chips in parallel to form the above-mentioned solar cell parallel unit.

[0024] As a preferred solution of the method for manufacturing a solar cell assembly, the separation of the cell sheet into a plurality of cell small sheets in step 100 is specifically as follows:

[0025] Separating the battery sheet into a first small sheet and a second small sheet; and / or,

[0026] The battery cell is separated into a third small piece, a fourth small piece, a fifth small piece and a sixth small piece.

[0027] The beneficial effects of the present invention are as follows: by setting L1, L2, L3 and L4 to be greater than 0mm, that is, setting the ends of the first fine grid line and the second fine grid line to be spaced from the cutting position, it is possible to avoid hard contact between the cutter and the grid line, thus preventing the grid line from pressing the battery cell during the cutting process, thereby causing hidden cracks in the silicon substrate of the battery cell; by setting L1>L3>0mm, L4>L2>0mm, that is, 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 cell is used for circuit connection, due to L4>L2, the second shortened end of the second fine grid line of the battery cell has enough space to accommodate the circuit connector, and the second fine grid line of the battery cell can be insulated from the circuit connector by means of spatial spacing, without the need for additional insulating parts, and similarly, when the second protruding end of the second fine grid line of the battery cell is used for circuit connection, due to L1>L3, the first shortened end of the first fine grid line of the battery cell has enough space to accommodate the circuit connector. The space is used to accommodate the circuit connector, the first fine grid line of the battery chip can be insulated from the circuit connector by means of spatial spacing, and no additional insulating component is needed, and the first fine grid line and the second fine grid line can be directly connected to the circuit connector respectively. In this way, the battery chip does not need to set up a main grid line structure, which can save the amount of grid line silver paste and reduce the manufacturing cost of the battery chip, and the structural design of the battery chip can reduce the use of insulating components and reduce the manufacturing cost of the battery chip; by arranging the first fine grid line in at least one wiring area along the first direction and the second fine grid line in another wiring area to be aligned, this can facilitate the conductive connection between the battery chips obtained after the battery chips are cut, and reduce the difficulty of the assembly process; the conductive adhesive strip is a flexible part, and the hardness of the conductive adhesive strip is much smaller than the hardness of the battery chip, and the conductive adhesive strip will not have a hard contact with the battery chip, which can avoid the problem of hidden cracks caused by pressure on the battery chip due to hard contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0029] Figure 1 This is a schematic diagram of a two-cell battery according to an embodiment of the present invention.

[0030] Figure 2 for Figure 1 Schematic diagram of the wiring area, the first fine grid line and the second fine grid line on the entire bisection battery.

[0031] Figure 3 for Figure 1 Schematic diagram of the two-cell battery after cutting.

[0032] Figure 4 for Figure 1 Schematic diagram of connecting the first small piece and the second small piece obtained by cutting the whole piece of the two-part battery in series.

[0033] Figure 5 for Figure 4 Enlarged schematic diagram of AA.

[0034] Figure 6 for Figure 4 Schematic diagram of circuit structure (the first thin gate line is the positive electrode, and the second thin gate line is the negative electrode).

[0035] Figure 7 It is a schematic diagram of an assembled state of a solar cell assembly according to an embodiment of the present invention (the second small piece is rotating).

[0036] Figure 8 This is a schematic diagram of another assembly state of the solar cell assembly according to the embodiment of the present invention (after the second small piece is rotated).

[0037] Fig. 9 Schematic diagram of a solar cell parallel unit according to an embodiment of the present invention Figure 1 ( Figure 8 Schematic diagram after assembly).

[0038] Fig.10 Schematic diagram of a solar cell parallel unit according to an embodiment of the present invention Figure 2 .

[0039] Fig.11 Schematic diagram of a solar cell parallel unit according to an embodiment of the present invention Figure 3 .

[0040] Fig.12 Schematic diagram of a solar cell parallel unit according to an embodiment of the present invention Figure 4 .

[0041] Fig.13 Schematic diagram of a solar cell series unit according to an embodiment of the present invention Figure 5 .

[0042] Fig.14The solar cell assembly according to the embodiment of the present invention is schematically shown in FIG. Figure 1 .

[0043] Fig.15 This is a schematic diagram of the wiring area, the first fine grid line and the second fine grid line of the entire two-divided battery according to another embodiment of the present invention.

[0044] Fig.16 for Fig.15 Schematic diagram of the parallel connection of the first small piece and the second small piece obtained by cutting the whole piece of the two-part battery.

[0045] Fig.17 This is a schematic diagram of a four-part battery cell according to an embodiment of the present invention.

[0046] Fig.18 for Fig.17 Schematic diagram of the wiring area, the first fine grid line and the second fine grid line on the entire four-divided battery.

[0047] Fig.19 for Fig.17 Schematic diagram of the four-piece battery after cutting.

[0048] Fig. 20 This is a schematic diagram of the third small piece and the fourth small piece being connected in parallel according to an embodiment of the present invention.

[0049] Fig.21 This is a schematic diagram of the fifth small piece and the sixth small piece connected in parallel according to an embodiment of the present invention.

[0050] Fig. 22 This is a schematic diagram of the third small piece and the fifth small piece connected in series according to an embodiment of the present invention.

[0051] Fig.23 This is a schematic diagram of the fourth small piece and the sixth small piece connected in series according to an embodiment of the present invention.

[0052] Fig.24 This is a schematic diagram of the third small piece, the fourth small piece, the fifth small piece and the sixth small piece connected in series according to an embodiment of the present invention.

[0053] Fig.25 This is a schematic diagram of the third small piece and the sixth small piece connected in series according to an embodiment of the present invention.

[0054] Fig.26 This is a schematic diagram of the fourth small piece and the fifth small piece connected in series according to an embodiment of the present invention.

[0055] Fig. 27 The solar cell assembly according to the embodiment of the present invention is schematically shown in FIG. Figure 2 .

[0056] Fig.28 for Fig. 27 An enlarged schematic diagram of point B.

[0057] In the figure:

[0058] 100, battery cell; 200, two-cell battery cell; 300, four-cell battery cell; 400, small battery cell; 500, first side view; 600, second side view; a, first small cell; b, second small cell; c, third small cell; d, fourth small cell; e, fifth small cell; f, sixth small cell;

[0059] 1. First thin grid line; 11. First protruding end; 12. First shortened end; 2. Second thin grid line; 21. Second protruding end; 22. Second shortened end; 3. Conductive rubber strip; 31. Series rubber strip; 32. Parallel rubber strip; 4. Wiring area; 41. Wiring edge; 401. First area; 402. Second area; 403. Third area; 404. Fourth area; 405. Fifth area; 406. Sixth area; 5. Cutting place; 51. First place; 52. Second place; 53. Third place. DETAILED DESCRIPTION

[0060] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0061] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] like Figures 1 to 3 , Fig.15 , Figures 17 to 19As shown, a battery cell 100 provided by the present invention has at least two wiring areas 4 arranged on the back side of the battery cell 100 along a first direction, a cutting portion 5 is arranged between two adjacent wiring areas 4, and the battery cell 100 can be separated into at least two battery small pieces 400 along the straight line where the cutting portion 5 is located, and a first fine grid line 1 and a second fine grid line 2 are arranged in the wiring area 4, the polarities of the first fine grid line 1 and the second fine grid line 2 are opposite, the lengths of the first fine grid line 1 and the second fine grid line 2 are both extended along the first direction, and the first fine grid line 1 and the second fine grid line 2 are alternately arranged along the second direction, wherein the first direction and the second direction are perpendicular, the first direction is a straight line direction parallel to the illustrated X direction, and the second direction is a straight line direction parallel to the illustrated Y direction, and the wiring area 4 has two wiring edges 41 , two wiring edges 41 are arranged at intervals along the first direction, the first fine gate line 1 has a first protruding end 11 and a first shortened end 12, the second fine gate line 2 has a second shortened end 22 and a second protruding end 21, the first protruding end 11 and the second shortened end 22 in the same wiring area 4 are close to the same wiring edge 41, the distance between the first shortened end 12 and the wiring edge 41 is L1, the distance between the first protruding end 11 and the wiring edge 41 is L2, the distance between the second protruding end 21 and the wiring edge 41 is L3, and the distance between the second shortened end 22 and the wiring edge 41 is L4, L1>L3>0mm, L4>L2>0mm; along the first direction, the first fine gate line 1 in at least one wiring area 4 is aligned with the second fine gate line 2 in another wiring area 4. In the figure, the first fine gate line 1 is distinguished from the second fine gate line 2 by using a cross-section line.

[0063] By setting L1, L2, L3 and L4 to be greater than 0 mm, that is, setting the ends of the first fine grid line 1 and the second fine grid line 2 to be spaced from the cutting position 5, it is possible to avoid hard contact between the cutter and the grid line, so that the grid line can be prevented from pressing the battery cell 100 during the cutting process, resulting in hidden cracks in the silicon substrate of the battery cell 100; by setting L1>L3>0 mm, L4>L2>0 mm, that is, the ends of the first fine grid line 1 and the second fine grid line 2 are not flush, refer to Figure 4When the first protruding end 11 of the first fine grid line 1 of the battery chip 400 is used for circuit connection, due to L4>L2, the second shortened end 22 of the second fine grid line 2 of the battery chip 400 has enough space to accommodate the circuit connector, and the second fine grid line 2 of the battery chip 400 can be insulated from the circuit connector by means of space spacing, without the need for additional insulating parts. Similarly, when the second protruding end 21 of the second fine grid line 2 of the battery chip 400 is used for circuit connection, due to L1>L3, the first shortened end 12 of the first fine grid line 1 of the battery chip 400 has enough space to accommodate the circuit connector, and the first fine grid line 1 of the battery chip 400 can be insulated from the circuit connector by means of space spacing, without the need for additional insulating parts, and the first fine grid line 1 and the second The fine grid lines 2 can be directly connected to the circuit connectors respectively. In this way, the battery chip 400 of this embodiment does not need to be provided with a main grid line structure. Compared with the traditional battery chip 400 and the battery cell 100, the present embodiment no longer provides a main grid line structure, which can save the amount of grid line silver paste and reduce the manufacturing cost of the battery chip 400 and the battery cell 100. In addition, the structural design of the battery chip 400 and the battery cell 100 can reduce the use of insulating parts and reduce the manufacturing cost of the battery chip 400 and the battery cell 100. By arranging the first fine grid line 1 in at least one wiring area 4 along the first direction and the second fine grid line 2 in another wiring area 4 to be aligned, it can facilitate the conductive connection between the battery chips 400 obtained after the battery cell 100 is cut, thereby reducing the difficulty of the assembly process.

[0064] In this embodiment, the cutting position 5 is a straight line. Figure 1 and Fig.17 The battery cell 100 has a first peripheral side surface 500 and a second peripheral side surface 600, and the first peripheral side surface 500 and the second peripheral side surface 600 are arranged at intervals along the first direction.

[0065] It should be noted that the wiring edge 41 mentioned in this embodiment is a virtual concept and not a physical structure. However, there is a corresponding relationship between the virtual concept of the wiring edge 41 and the physical structure of the battery cell 100. Figure 1 and Figure 2 , Figure 2 The two wiring areas 4 in the figure are marked as the first area 401 and the second area 402 from top to bottom, and the wiring edge 41 on the upper side of the first area 401 corresponds to Figure 1 The first peripheral side surface 500 of the middle battery cell 100 and the wiring edge 41 on the lower side of the first area 401 correspond to Figure 2 The cutting point 5 in the second area 402 corresponds to the wiring edge 41 on the upper side of the second area 402. Figure 2 The cutting point 5 in the second region 402 corresponds to the wiring edge 41 on the lower side. Figure 1 The second side surface 600 of the middle battery cell 100; another example is given for illustration: Fig.17 and Fig.18 , Fig.18 The four wiring areas 4 in the figure are marked as the third area 403, the fourth area 404, the fifth area 405 and the sixth area 406 from top to bottom. Fig.18 The three cutting locations 5 are marked as the first location 51, the second location 52 and the third location 53 from top to bottom, and the wiring edge 41 on the upper side of the third area 403 corresponds to Fig.17 On the first side surface 500 of the middle battery cell 100, the lower wiring edge 41 of the third area 403 corresponds to the first location 51, the upper wiring edge 41 of the fourth area 404 corresponds to the first location 51, the lower wiring edge 41 of the fourth area 404 corresponds to the second location 52, the upper wiring edge 41 of the fifth area 405 corresponds to the second location 52, the lower wiring edge 41 of the fifth area 405 corresponds to the third location 53, the upper wiring edge 41 of the sixth area 406 corresponds to the third location 53, and the lower wiring edge 41 of the sixth area 406 corresponds to Fig.17 The second peripheral side 600 of the battery cell 100.

[0066] The figure is a simplified diagram of a battery cell 100 and a battery chip 400. In the figure, only two first fine grid lines 1 and two second fine grid lines 2 are drawn on each wiring area 4 and each battery chip 400. In actual products, the number of first fine grid lines 1 and second fine grid lines 2 on each wiring area 4 and each battery chip 400 is not limited by the number shown in the figure. A plurality of first fine grid lines 1 and second fine grid lines 2 can be set on the battery chip 400, for example, 50, 100, 200, etc.

[0067] In this embodiment, the first direction is perpendicular to the second direction, and the battery chip 400 is rectangular. By providing rectangular battery chips 400, the battery chips 400 can be arranged in an array, so that the battery chips 400 are arranged in an orderly manner, and when the battery chips 400 are arranged, the peripheral side surfaces of two adjacent battery chips 400 can be close to each other or close to each other with a small gap, thereby minimizing the spacing between the battery chips 400, and also facilitating the circuit connection between the circuit connector and the fine grid lines on the battery chips 400.

[0068] Reference Figure 2 , Figure 3 , Fig.17 and Fig.18 , L1=L4, L3=L2. By setting L1=L4, L3=L2, the two ends of the first fine grid line 1 and the second fine grid line 2 on the battery chip 400 are at equal distances from the wiring edge 41 of the wiring area 4, which can facilitate the subsequent connection between the first fine grid line 1 and the second fine grid line 2 on the battery chip 400 and the circuit connector.

[0069] Furthermore, on each battery chip 400, the ends of all the first thin grid lines 1 are aligned, and the ends of all the second thin grid lines 2 are aligned. On each battery chip 400, the ends of all the first thin grid lines 1 are aligned, and the ends of all the second thin grid lines 2 are aligned, which can facilitate the subsequent connection between the battery chip 400 and the circuit connector, so that the circuit connector can be connected to each thin grid line, thereby realizing the conduction of the circuit and the collection of current.

[0070] Reference Figures 1 to 4 In one embodiment, the battery cell 100 is a two-piece battery cell 200, and the two-piece battery cell 200 can be separated into two battery small pieces 400, and the two battery small pieces 400 are respectively a first small piece a and a second small piece b, and the first protruding end 11 on the first small piece a is close to the second protruding end 21 on the second small piece b. By setting the first protruding end 11 on the first small piece a close to the second protruding end 21 on the second small piece b, when the first small piece a and the second small piece b are connected in series, it is not necessary to rotate the first small piece a or the second small piece b, thereby reducing the steps of the assembly operation, improving the efficiency of the assembly, and helping to reduce costs.

[0071] Reference Fig.15 and Fig.16 In another embodiment, on the battery cell, the first protruding end 11 in one wiring area 4 is close to the second shortened end 22 in another wiring area 4. When the two battery pieces 400 cut from the two-piece battery 200 of this embodiment are connected in parallel, the battery pieces 400 can be translated without rotation, which can also reduce the steps of the assembly operation, improve the efficiency of the assembly, and help reduce costs.

[0072] Reference Figures 17 to 22 In another embodiment, the battery cell 100 is a four-part battery cell 300, and the four-part battery cell 300 can be separated into four battery chips 400, and the four battery chips 400 are respectively a third chip c, a fourth chip d, a fifth chip e and a sixth chip f. Along the first direction, the first fine grid line 1 on the third chip c is aligned with the first fine grid line 1 on the fourth chip d, and the first shortened end 12 on the third chip c is close to the first shortened end 12 on the fourth chip d. Along the first direction, the first fine grid line 1 on the fourth chip d is aligned with the second fine grid line 2 on the fifth chip e, and the first protruding end 11 of the fourth chip d is close to the second shortened end 22 of the fifth chip e. Along the first direction, the second fine grid line 2 on the fifth chip e is aligned with the second fine grid line 2 on the sixth chip f, and the second protruding end 21 on the fifth chip e is close to the second protruding end 21 on the sixth chip f. By setting the third chip c, the fourth chip d, the fifth chip e and the sixth chip f, refer to Fig. 20 and Fig.21When the battery pieces 400 need to be connected in parallel, the battery pieces 400 can be directly translated, for example, the third piece c and the fourth piece d are directly moved in parallel, and the fifth piece e and the sixth piece f are directly moved in parallel, referring to Fig. 22 and Fig.23 When it is necessary to connect the battery pieces 400 in series, the third piece c and the fifth piece e are directly moved in series, and the fourth piece d and the sixth piece f are directly moved in series. For another example, the third piece c, the fourth piece d, the fifth piece e and the sixth piece f can be directly moved, and the battery pieces 400 are connected in series in pairs. There is no need to rotate the battery piece 400, which reduces the assembly steps and helps to reduce costs.

[0073] Of course, in other embodiments, six wiring areas 4, eight wiring areas 4, etc. can be set on the battery cell 100, and the corresponding battery cell 100 is a six-part battery cell, an eight-part battery cell, etc. The six-part battery cell can be separated into six small battery cells 400, the eight-part battery cell can be separated into eight small battery cells 400, and so on. There is no limit to the number of wiring areas 4 on the battery cell 100.

[0074] Reference Figures 4 to 6 , Fig.13 , Figure 22 to Figure 24 A solar cell series unit comprises a series adhesive strip 31 and at least two battery chips 400, wherein the battery chips 400 are cut and formed by the battery chips 100 in any of the above embodiments, the series adhesive strip 31 is a conductive adhesive strip 3, and two adjacent battery chips 400 are connected by the series adhesive strip 31, and the series adhesive strip 31 is located on the back of the battery chips 400, and the series adhesive strip 31 is connected to the first protruding end 11 on one of the battery chips 400, and the second fine grid line 2 on one of the battery chips 400 is spaced from the series adhesive strip 31, and the series adhesive strip 31 is connected to the second protruding end 21 on another battery chip 400, and the first fine grid line 1 on the other battery chip 400 is spaced from the series adhesive strip 31.

[0075] It should be noted that the battery pieces 400 in the solar cell series unit can be arranged along the first direction or along the second direction, and there are many arrangements. Figure 4 , Fig. 22 and Fig.23 , two battery chips 400 are arranged along the first direction, referring to Fig.13 , Fig.25 and Fig.26 , the two battery pieces 400 are arranged along the second direction.

[0076] The conductive rubber strip 3 (series rubber strip 31) in this embodiment is the circuit connector mentioned in the above embodiment. By setting the conductive rubber strip 3, the conductive rubber strip 3 can make the battery chips 400 electrically connected, so as to realize the collection of current; the conductive rubber strip 3 is a flexible member, and the hardness of the conductive rubber strip 3 is much smaller than the hardness of the battery chip 400. The conductive rubber strip 3 does not have a hard contact with the battery chip 400, so that the problem of hidden cracks caused by hard contact on the battery chip 400 can be avoided; because the conductive rubber strip 3 is sticky, it can be directly pasted on the battery chip The conductive adhesive strip 3 is adhesive and can be directly pasted on the battery sheet 400. Therefore, when arranging the battery sheets 400, there is no need to reserve space for placing the busbars and welding them, so that the battery sheets 400 can be arranged more closely, which is beneficial to reducing the area of ​​the solar cell module and improving the power generation efficiency of the solar cell module. The solar cell modules can be arranged more closely, so the size of the shell and other parts of the solar cell module can be reduced accordingly, which can reduce the production cost of the solar cell module. The reduction in the size of the shell and other parts of the solar cell module can reduce the overall size and weight of the solar cell module accordingly, which can reduce the transportation cost of the solar cell module. The conductive adhesive strip 3 is used for circuit connection, and the gram weight of the conductive adhesive strip 3 is much lower than the gram weight of the bus bar in the prior art. Therefore, the weight of the solar cell module can also be reduced. By setting the thin grid lines that do not need to be connected to the conductive adhesive strip 3, the thin grid lines that do not need to be connected in the battery chip 400 can be insulated from the conductive adhesive strip 3 by space spacing, so as to avoid short circuit in the battery chip 400. The conductive adhesive strip 3 is set on the back side of the battery chip 400, and the back of the battery chip 400 directly supports the conductive adhesive strip 3. On the one hand, the difficulty of laying the adhesive can be reduced. On the other hand, the conductive adhesive strip 3 does not need to be set between the battery chips 400, so that the battery chips 400 can be arranged more closely and the distance between the battery chips 400 can be reduced.

[0077] It should be noted that the first thin gate line 1 and the second thin gate line 2 have opposite polarities. For example, the first thin gate line 1 is a positive electrode and the second thin gate line 2 is a negative electrode. Figure 6 for Figure 4 Circuit connection diagram.

[0078] Reference Figures 9 to 12 , Fig.16 , Fig. 20 and Fig.21The present embodiment also provides a solar cell parallel unit, including a parallel adhesive strip 32 and at least two battery chips 400, wherein the battery chips 400 are formed by cutting the battery chips 100, and the parallel adhesive strip 32 is a conductive adhesive strip 3, which connects two adjacent battery chips 400, and the parallel adhesive strip 32 is located on the back of the battery chip 400, referring to Fig. 20 In one embodiment, the parallel adhesive strips 32 are respectively connected to the first protruding ends 11 on the two battery chips 400, and the second fine grid lines 2 on the battery chips 400 are spaced apart from the parallel adhesive strips 32. Fig.21 In another embodiment, the parallel adhesive strips 32 are respectively connected to the second protruding ends 21 on the two battery chips 400 , and the first fine grid lines 1 on the battery chips 400 are spaced apart from the parallel adhesive strips 32 .

[0079] The conductive rubber strip 3 (parallel rubber strip 32) in this embodiment is the circuit connector mentioned in the above embodiment. By setting the conductive rubber strip 3, the conductive rubber strip 3 can make the battery chips 400 electrically connected, so as to realize the collection of current; the conductive rubber strip 3 is a flexible part, and the hardness of the conductive rubber strip 3 is much smaller than the hardness of the battery chip 400. The conductive rubber strip 3 does not have a hard contact with the battery chip 400, so that the problem of hidden cracks in the battery chip 400 caused by hard contact can be avoided; because the conductive rubber strip 3 is sticky, it can be directly pasted on the battery chip 40 0, no welding process is required, on the one hand, it is convenient to operate and can improve the efficiency of assembly, on the other hand, it can avoid the problem of hidden cracks in the battery chip 400 caused by the welding process; because the conductive adhesive strip 3 is sticky, it can be directly pasted on the battery chip 400, therefore, when arranging the battery chips 400, there is no need to reserve space for placing the bus bar and welding, so that the battery chips 400 can be arranged more closely, which is conducive to reducing the area of ​​the solar cell module and improving the power generation efficiency of the solar cell module; because the battery chips 400 can be arranged The arrangement is tighter, so the size of the shell and other parts of the solar cell module can be reduced accordingly, which can reduce the production cost of the solar cell module, and the reduction in the size of the shell and other parts of the solar cell module can make the overall size and weight of the solar cell module also reduced accordingly, which can reduce the transportation cost of the solar cell module; the conductive adhesive strip 3 is used for circuit connection, and the gram weight of the conductive adhesive strip 3 is much lower than the gram weight of the bus bar in the prior art, so the weight of the solar cell module can also be reduced; by setting the thin grid lines that do not need to be connected and the conductive adhesive strip 3 to be spaced, the thin grid lines that do not need to be connected in the battery chip 400 can be insulated from the conductive adhesive strip 3 by space spacing, so as to avoid short circuit in the battery chip 400; the conductive adhesive strip 3 is set on the back side of the battery chip 400, and the back of the battery chip 400 directly supports the conductive adhesive strip 3. On the one hand, it can reduce the difficulty of laying glue, and on the other hand, the conductive adhesive strip 3 does not need to be set between the battery chips 400, so that the battery chips 4001 can be arranged more tightly and the distance between the battery chips 400 can be reduced.

[0080] It should be noted that the battery chips 400 in the solar cell parallel unit can be arranged along the first direction or along the second direction, and there are many arrangements. Fig. 9 , Fig.10 , Fig. 20 and Fig.21 , the two battery chips 400 can be arranged along the first direction, referring to Fig.11 and Fig.12 , two battery chips 400 can be arranged along the second direction.

[0081] Reference Fig.14 and Fig. 27 The present invention also provides a solar cell assembly, comprising the above-mentioned solar cell series unit and the above-mentioned solar cell parallel unit. Figure 4 and Fig.24 The solar cell assembly may only include the solar cell series unit but not the solar cell parallel unit, or the solar cell assembly may only include the solar cell parallel unit but not the solar cell series unit. Since the solar cell series unit and the solar cell parallel unit cell pieces 400 can be arranged more closely, the size of the shell and other parts of the solar cell assembly can be reduced accordingly, which can reduce the production cost of the solar cell assembly. The reduction in the size of the shell and other parts of the solar cell assembly can also reduce the overall size and weight of the solar cell assembly accordingly, which can reduce the transportation cost of the solar cell assembly.

[0082] Further, see Fig.28, along the first direction, the distance between the circumferential sides of two adjacent battery chips 400 is W1, 0mm≤W1≤1.3mm, illustratively, W1 can 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, along the first direction, the two adjacent battery chips 400 can be fitted or spaced, and the maximum spacing distance between the two adjacent battery chips 400 is 1.3mm, realizing a small spacing setting; it can be understood that the distance between the battery chips of a conventional solar cell is between 1.5mm and 2mm, while in the solar cell module of this embodiment, in the first direction, the distance between the two adjacent battery chips 400 can be shortened to 0mm~1.3mm, which is much smaller than that of a conventional solar cell. Therefore, the structure of the solar cell module of this embodiment can reduce the area of ​​the battery module and improve the power generation efficiency. Along the second direction, the distance between the peripheral sides of two adjacent battery pieces 400 is W2, 0mm≤W2≤1.3mm, W2 can 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. It should be noted that the values ​​of W1 and W2 can be different or the same. For example, when W1=0mm and W2=0.5mm, along the first direction, the peripheral sides of two adjacent battery pieces 400 are in contact with each other. Along the second direction, there is a gap of 0.5mm between the circumferential side surfaces of two adjacent battery pieces 400. For example, when W1=0mm and W2=0mm, along the first direction, the circumferential side surfaces of two adjacent battery pieces 400 are in contact with each other, and along the second direction, the circumferential side surfaces of two adjacent battery pieces 400 are also in contact with each other. For example, when W1=0.6mm and W2=0.8mm, along the first direction, there is a gap of 0.6mm between the circumferential side surfaces of two adjacent battery pieces 400, and along the second direction, there is a gap of 0.8mm between the circumferential side surfaces of two adjacent battery pieces 400.

[0083] It should be noted that when the conductive strip 3 is cut and formed by conductive tape, the values ​​of W1 and W2 can be greater than 0 mm, that is, there can be gaps between the battery pieces 400. When the conductive glue is directly coated on the surface of the battery piece 400 to solidify and form the conductive strip 3, the values ​​of W1 and W2 are both 0 mm, that is, the battery pieces 400 need to be fitted together.

[0084] Preferably, the peripheral side surfaces of two adjacent battery chips 400 are bonded. Since the ends of the first fine grid line 1 and the second fine grid line 2 are spaced from the edge of the battery chip 400, when the two battery chips 400 are tightly bonded, the fine grid lines on the two battery chips 400 will not directly contact each other, and will not cause a short circuit problem between the battery chips 400. Therefore, the peripheral side surfaces of two adjacent battery chips 400 can be bonded to reduce the spacing between the battery chips 400.

[0085] In this embodiment, the conductive rubber strip 3 (the series rubber strip 31 and / or the parallel rubber strip 32) is integrally formed. By providing the conductive rubber strip 3 (the series rubber strip 31 and / or the parallel rubber strip 32) as an integrally formed device, on the one hand, the electrical connection stability between the two battery chips 400 can be improved, and on the other hand, the number of rubber strips can be reduced, and the workload of cutting or coating the rubber strips can be reduced, thereby reducing the production cost. In other embodiments, the series rubber strip 31 includes a first series portion and a second series portion, and the first series portion and the second series portion are respectively connected to the fine grid lines on the two battery chips 400. The first series portion and the second series portion of the series rubber strip 31 can be independent, and the two are bonded by their own viscosity. Of course, the parallel rubber strip 32 can also include a first parallel portion and a second parallel portion, and the first parallel portion and the second parallel portion are respectively bonded to the two battery chips 400. The first parallel portion and the second parallel portion can be independent, and the two are bonded by their own viscosity.

[0086] Preferably, the center of the conductive adhesive strip 3 is aligned with the splicing edge of the two battery chips 400. By aligning the center of the conductive adhesive strip 3 with the splicing edge of the two battery chips 400, that is, the bonding area of ​​the conductive adhesive strip 3 and the two battery chips 400 is consistent, so that the bonding stability of the conductive adhesive strip 3 and each battery chip 400 can be guaranteed to the greatest extent, and peeling between the conductive adhesive strip 3 and the battery chip 400 can be avoided.

[0087] Reference Figure 4 and Fig. 20 , the two battery chips 400 are arranged along the first direction, the width center of the conductive rubber strip 3 is aligned with the splicing edge of the two battery chips 400, and the maximum width of the conductive rubber strip 3 is D, 0.5D<L4, and 0.5D<L1. By setting 0.5D<L4 and 0.5D<L1, the conductive rubber strip 3 can be spaced from the thin grid lines that do not need to be connected to avoid contact between the two and causing a short circuit.

[0088] In this embodiment, the solar cell assembly further includes tempered glass, an adhesive film and a back plate. The solar cell series unit and the solar cell parallel unit are both located in the adhesive film, and the adhesive film is located between the tempered glass and the back plate.

[0089] This embodiment also provides a method for manufacturing a solar cell assembly, comprising the following steps:

[0090] Step 100, cutting along the cutting position 5 of the battery cell 100 in any of the above embodiments to separate the battery cell 100 into a plurality of battery small pieces 400;

[0091] Step 200, arranging battery chips 400;

[0092] Step 300, pasting or molding conductive adhesive strips 3 on the battery pieces 400, so that the battery pieces 400 are connected in series to form a solar cell series unit in any of the above embodiments, and the battery pieces 400 are connected in parallel to form a solar cell parallel unit in any of the above embodiments.

[0093] By arranging the battery chips 400 first and then forming the conductive rubber strip 3 , the forming of the conductive rubber strip 3 can be facilitated and the production efficiency can be improved.

[0094] In one embodiment, a two-cell battery sheet 200 in any of the above embodiments is provided, and the steps include:

[0095] Cutting along the cutting position 5 of the bipartition battery whole sheet 200 to separate the bipartition battery whole sheet 200 into a first small sheet a and a second small sheet b;

[0096] The first small piece a and the second small piece b are translated so that the first small piece a and the second small piece b are arranged along the first direction, and the first protruding end 11 of the first small piece a is close to the second protruding end 21 of the second small piece b;

[0097] A series connection adhesive strip 31 is formed on the first small piece a and the second small piece b, so that the first small piece a and the second small piece b are connected in series to form a solar cell series connection unit.

[0098] Reference Fig.14 The two battery chips 400 arranged along the first direction are formed by cutting the same two-part battery chip 200. In the process of assembling the whole solar cell chip, the battery chip 400 can be directly translated according to the position requirements of the battery chip 400 without the need to rotate the battery chip 400, which reduces the assembly steps and helps to reduce costs.

[0099] It should be noted that Figures 7 to 9 The rotating battery slice 400 shown in the figure is connected in parallel, which is only an example of an assembly operation. In this embodiment, the solar cell assembly includes a plurality of battery slices 400, and the plurality of battery slices 400 are cut from a plurality of bisection battery slices 200. For example, the bisection battery slice 200 can be Figure 1 The two-cell whole 200 shown may also be Fig.15The two-piece battery wafer 200 shown can avoid rotation by performing position translation on the battery chips 400 obtained by cutting different two-piece battery wafers 200.

[0100] In another embodiment, a four-part battery cell 300 in any of the above embodiments is provided, and the steps include:

[0101] Cutting is performed along the cutting position 5 of the four-part battery whole piece 300 to separate the four-part battery whole piece 300 into a third small piece c, a fourth small piece d, a fifth small piece e and a sixth small piece f;

[0102] The third small piece c, the fourth small piece d, the fifth small piece e and the sixth small piece f are translated so that the third small piece c and the fourth small piece d are arranged along the first direction, the fifth small piece e and the sixth small piece f are arranged along the first direction, and the third small piece c and the sixth small piece f are arranged along the second direction;

[0103] A parallel rubber strip 32 is formed on the third small piece c and the fourth small piece d, so that the third small piece c and the fourth small piece d are connected in parallel to form a solar cell parallel unit; a parallel rubber strip 32 is formed on the fifth small piece e and the sixth small piece f, so that the fifth small piece e and the sixth small piece f are connected in parallel to form a solar cell parallel unit; a series rubber strip 31 is formed on the third small piece c and the sixth small piece f, so that the third small piece c and the sixth small piece f are connected in series to form a solar cell series unit.

[0104] Reference Fig. 27 The four battery pieces 400 arranged along the first direction are formed by cutting the same four-part battery whole piece 300. In the process of assembling the whole solar cell sheet, the battery piece 400 can be directly translated according to the position requirements of the battery piece 400 without the need to rotate the battery piece 400 additionally, thereby reducing the assembly steps and helping to reduce costs.

[0105] The conductive strip 3 can be formed by curing conductive glue or by cutting conductive tape. In one embodiment, the conductive strip 3 is formed by curing conductive glue. Then, the conductive glue can be applied to a preset position on the battery chip 400, and the conductive strip 3 is formed after the conductive glue is cured. In another embodiment, the conductive tape can be cut and formed first, and then the conductive tape can be pasted at a preset position on the battery chip 400 to form the conductive strip 3.

[0106] In this embodiment, during assembly, the tempered glass of the solar cell assembly is first inverted, and then the battery pieces 400 are arranged on the tempered glass. After the arrangement is completed, a conductive adhesive strip 3 is formed on the battery pieces 400 to connect the battery pieces 400. Then, the blank of the adhesive film and the back plate are stacked in sequence on the battery pieces 400, and the back plate is pressed under high temperature conditions so that the blank of the adhesive film is melted by the heat, wrapping the battery pieces 400 and filling the gap between the tempered glass and the back plate. After cooling, it solidifies to form an adhesive film, and finally the entire assembly is flipped 180°.

[0107] In the description herein, it should be understood that the terms "upper", "lower", "left", "right", etc., and the like, are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0108] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0109] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0110] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A battery cell, characterized in that: At least two wiring areas are arranged along the first direction on the back side of the battery sheet, a cutting position is arranged between two adjacent wiring areas, and the battery sheet can be separated into at least two small battery sheets along the straight line where the cutting position is located, a first fine grid line and a second fine grid line are arranged in the wiring area, the first fine grid line and the second fine grid line have opposite polarities, the lengths of the first fine grid line and the second fine grid line both extend along the first direction, and the first fine grid line and the second fine grid line are alternately arranged along the second direction, the wiring area has two wiring edges, the two wiring edges are arranged at intervals along the first direction, the first fine grid line has a first protruding end and a first shortened end, the second fine grid line has a second shortened end and a second protruding end, the first protruding end and the second shortened end in the same wiring area are close to the same wiring edge, the distance between the first shortened end and the wiring edge is L1, the distance between the first protruding end and the wiring edge is L2, the distance between the second protruding end and the wiring edge is L3, and the distance between the second shortened end and the wiring edge is L4, L1>L3>0mm, L4>L2>0mm; Along the first direction, the first fine gate line in at least one of the wiring regions is aligned with the second fine gate line in another of the wiring regions; When the first protruding end and the second protruding end are used for circuit connection, both the second shortened end and the first shortened end have enough space to accommodate a circuit connector, and no additional insulating member is needed.

2. The battery cell according to claim 1, characterized in that: The battery sheet is a two-piece battery sheet, and the two-piece battery sheet can be separated into two battery small pieces, the two battery small pieces are respectively a first small piece and a second small piece, and a first protruding end on the first small piece is close to a second protruding end on the second small piece.

3. The battery cell according to claim 1, characterized in that: The battery cell is a four-piece battery cell, and the four-piece battery cell can be separated into four battery small pieces, and the four battery small pieces are respectively a third small piece, a fourth small piece, a fifth small piece and a sixth small piece. Along the first direction, the first fine grid line on the third small piece is aligned with the first fine grid line on the fourth small piece, and the first shortened end on the third small piece is close to the first shortened end on the fourth small piece. Along the first direction, the first thin grid line of the fourth small piece is aligned with the second thin grid line of the fifth small piece, and the first protruding end of the fourth small piece is close to the second shortened end of the fifth small piece. Along the first direction, the second fine gate lines of the fifth small piece are aligned with the second fine gate lines of the sixth small piece, and the second protruding end of the fifth small piece is close to the second protruding end of the sixth small piece.

4. A solar cell series unit, characterized in that: It comprises a series rubber strip and at least two battery chips, wherein the battery chips are cut and formed by the battery chips according to any one of claims 1 to 3, the series rubber strip is a conductive rubber strip, two adjacent battery chips are connected by the series rubber strip, the series rubber strip is located on the back of the battery chips, the series rubber strip is connected to the first protruding end on one of the battery chips, and the second fine grid line on one of the battery chips is spaced from the series rubber strip, the series rubber strip is connected to the second protruding end on another battery chip, and the first fine grid line on the other battery chip is spaced from the series rubber strip.

5. A solar cell parallel unit, characterized in that: It comprises parallel adhesive strips and at least two battery chips, wherein the battery chips are cut and formed by the battery chips according to any one of claims 1 to 3, wherein the parallel adhesive strips are conductive adhesive strips, wherein the parallel adhesive strips connect two adjacent battery chips, wherein the parallel adhesive strips are located on the back of the battery chips, wherein the parallel adhesive strips are respectively connected to the first protruding ends on the two battery chips, and the second fine grid lines on the battery chips are spaced apart from the parallel adhesive strips, or wherein the parallel adhesive strips are respectively connected to the second protruding ends on the two battery chips, and the first fine grid lines on the battery chips are spaced apart from the parallel adhesive strips.

6. A solar cell module, characterized in that: It comprises the solar cell series connection unit as claimed in claim 4 and / or the solar cell parallel connection unit as claimed in claim 5.

7. The solar cell assembly according to claim 6, characterized in that: Along the first direction, the distance between the circumferential side surfaces of two adjacent battery chips is W1, 0mm≤W1≤1.3mm.

8. The solar cell assembly according to claim 6, characterized in that: It comprises two battery chips arranged along a first direction, the width center of the conductive adhesive strip in the solar cell assembly is aligned with the splicing edges of the two battery chips, and the maximum width of the conductive adhesive strip is D, 0.5D<L4, 0.5D<L1.

9. A method for manufacturing a solar cell module, characterized in that: The following steps are involved: Step 100, cutting along the cutting position of the battery sheet according to any one of claims 1 to 3 to separate the battery sheet into a plurality of small battery sheets; Step 200, arranging the battery chips; Step 300 , pasting or molding conductive adhesive strips on the battery chips to connect the battery chips in series to form a solar cell series unit as claimed in claim 4 , and to connect the battery chips in parallel to form a solar cell parallel unit as claimed in claim 5 .

10. The method for manufacturing a solar cell module according to claim 9, characterized in that: The step 100 of separating the battery cell into a plurality of battery small cells is specifically as follows: Separating the battery sheet into a first small sheet and a second small sheet; and / or, The battery cell is separated into a third small piece, a fourth small piece, a fifth small piece and a sixth small piece.

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