Solar cell related structure and manufacturing method thereof

Abstract

The present invention discloses a solar cell related structure and a manufacturing method thereof, wherein the lengths of the first fine grid line and the second fine grid line of a battery chip are both extended along the first direction, the first fine grid line and the second fine grid line are alternately arranged along the second direction, the first fine grid line includes a first protruding end and a first shortened end, the second fine grid line includes a second protruding end and a second shortened end, the distance between the first shortened end and the first peripheral side surface is L1, the distance between the first protruding end and the second peripheral side surface is L2, the distance between the second protruding end and the first peripheral side surface is L3, the distance between the second shortened end and the second peripheral side surface is L4, L1>L3>0mm, L4>L2>0mm. The end of the first fine grid line protruding from the second fine grid line can be connected to a circuit connector, and the second fine grid line and the circuit connector can be insulated by space spacing, without the need to set an insulating member, thereby reducing the cost of the battery chip.

Description

Technical Field

[0001] The present invention relates to the technical field of solar power generation, and in particular to a small battery sheet, a double-divided battery sheet, a solar battery series unit, a solar battery parallel unit, a solar battery module and a manufacturing method thereof. 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 and a bi-split battery cell, which have 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 sheet is provided, the battery sheet comprising a first peripheral side surface and a second peripheral side surface, a plurality of first fine grid lines and a plurality of second fine grid lines are arranged on the back side of the battery sheet, the lengths of the first fine grid lines and the second fine grid lines both extend along the first direction, the first fine grid lines and the second fine grid lines are alternately arranged along the second direction, the first fine grid lines comprise a first protruding end and a first shortened end, the second fine grid lines comprise a second protruding end and a second shortened end, the distance between the first shortened end and the first peripheral side surface is L1, the distance between the first protruding end and the second peripheral side surface is L2, the distance between the second protruding end and the first peripheral side surface is L3, the distance between the second shortened end and the second peripheral side surface is L4, L1>L3>0mm, L4>L2>0mm.

[0009] As a preferred solution of the battery chip, the battery chip further includes a third peripheral side surface and a fourth peripheral side surface, the third peripheral side surface and the fourth peripheral side surface are perpendicular to the first peripheral side surface, and the first peripheral side surface and the second peripheral side surface are parallel;

[0010] and / or,

[0011] All ends of the first thin gate lines are aligned, and all ends of the second thin gate lines are aligned.

[0012] In a second aspect, a dual-cell sheet is provided, wherein a cutting portion is provided on the back of the dual-cell sheet, and the dual-cell sheet can be cut into the two aforementioned small battery sheets at the cutting portion, and the two small battery sheets are arranged in the same direction.

[0013] In a third aspect, a solar cell series unit is provided, comprising a series rubber strip and two of the above-mentioned battery chips, wherein the series rubber strip is a conductive 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 the other battery chip, and the first fine grid line on the other battery chip is spaced from the series rubber strip.

[0014] In a fourth aspect, a solar cell parallel unit is provided, comprising a parallel rubber strip and two of the above-mentioned battery chips, wherein the parallel rubber strip is a conductive rubber strip, and the parallel rubber strip is located on the back of the battery chip, and 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.

[0015] In a fifth aspect, a solar cell assembly is provided, the above-mentioned solar cell series unit and / or the above-mentioned solar cell parallel unit.

[0016] As a preferred solution of the solar cell assembly, the two battery chips in the solar cell series unit are arranged along a first direction, or the two battery chips in the solar cell series unit are arranged along a second direction; the first direction is perpendicular to the second direction;

[0017] The two battery chips in the solar cell parallel unit are arranged along the first direction, or the two battery chips in the solar cell parallel unit are arranged along the second direction;

[0018] The distance between the circumferential side surfaces of two adjacent battery chips along the first direction is W1, 0mm≤W1≤1.3mm.

[0019] As a preferred solution of a solar cell assembly, it includes two battery chips 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 battery chips, and the maximum width of the conductive strip is D, 0.5D<L4, 0.5D<L1.

[0020] In a sixth 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 above-mentioned double-divided battery sheet to separate the double-divided battery sheet into the above-mentioned battery small 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 method for manufacturing a solar cell module,

[0025] The solar cell series connection unit comprises the following forming steps: after cutting the two-divided solar cell sheet, directly splicing the two solar cell sheets, and then forming the conductive adhesive strip;

[0026] The solar cell parallel unit comprises the following molding steps: after cutting the two-divided cell sheets, firstly rotating one of the cell sheets by 180° so that the first side surfaces / second side surfaces of the two cell sheets are attached to each other, and then molding the conductive adhesive strip.

[0027] The beneficial effects of the present invention are as follows: by setting L1>L3>0mm, L4>L2>0mm, the ends of the first fine grid line and the second fine grid line are not flush, and when the first protruding end of the first fine grid line of the battery sheet is used for circuit connection, due to L4>L2, the second shortened end of the second fine grid line of the battery sheet has enough space to accommodate the circuit connector, and the second fine grid line of the battery sheet 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 sheet is used for circuit connection, due to L1>L3, the first shortened end of the first fine grid line of the battery sheet has enough space to accommodate the circuit connector, and the first fine grid line of the battery sheet can be insulated from the circuit connector by means of spatial spacing, without the need for additional insulating parts. An insulating member is additionally used, and the first thin grid line and the second thin grid line can be directly connected to the circuit connector respectively, so that the battery chip does not need to be provided with 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 members and reduce the manufacturing cost of the battery chip; by setting the grid lines on the double-divided battery chip to be spaced apart from the cutting position, the hard contact between the cutter and the grid line can be avoided, thus avoiding the grid line from pressing the double-divided battery chip during the cutting process, causing hidden cracks in the silicon substrate of the double-divided battery chip; the conductive rubber strip is a flexible member, and the hardness of the conductive rubber strip is much smaller than that of the battery chip, and the conductive rubber strip does not have a hard contact with the battery chip, thus avoiding the problem of the battery chip being compressed and cracking 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 Schematic diagram of a dual-cell battery cell according to an embodiment of the present invention.

[0030] Figure 2 It is a schematic diagram of the double-divided battery cell after cutting according to an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram of a battery chip according to an embodiment of the present invention.

[0032] Figure 4 Schematic diagram of a battery string according to an embodiment of the present invention (small battery cells are connected in series).

[0033] Figure 5 for Figure 4 Schematic diagram of the cross-section at 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 cell piece is rotating).

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

[0037] Fig. 9 for Figure 8 Schematic diagram after assembly (the battery cells are arranged along the first direction and connected in parallel).

[0038] Fig.10 This is a schematic diagram of a battery string according to another embodiment of the present invention (the battery cells are arranged along the first direction and connected in parallel).

[0039] Fig.11 It is a schematic diagram of the series connection of multiple battery chips according to an embodiment of the present invention.

[0040] Fig.12 This is a schematic diagram of the battery chips arranged along the second direction and connected in parallel according to an embodiment of the present invention.

[0041] Fig.13 This is a schematic diagram of battery chips arranged along the second direction and connected in parallel according to another embodiment of the present invention.

[0042] Fig.14 It is a schematic diagram of series and parallel connection of multiple battery chips in a solar cell module according to an embodiment of the present invention.

[0043] Fig.15 for Fig.14 Schematic diagram of circuit structure (the first thin gate line is the positive electrode, and the second thin gate line is the negative electrode).

[0044] Fig.16 for Fig.14 An enlarged schematic diagram of point B.

[0045] Fig.17 This is a schematic diagram of battery chips arranged along the second direction and connected in series according to an embodiment of the present invention.

[0046] In the figure:

[0047] 1. Double-divided battery cell; 101. Wiring area; 102. Cutting point; 11. Small battery cell; 111. Main body; 112. First thin grid line; 1121. First protruding end; 1122. First shortened end; 113. Second thin grid line; 1131. Second protruding end; 1132. Second shortened end; 114. First peripheral side; 115. Second peripheral side; 2. Conductive rubber strip; 21. Series rubber strip; 211. First series part; 212. Second series part; 22. Parallel rubber strip; 221. First parallel part; 222. Second parallel part. DETAILED DESCRIPTION

[0048] 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.

[0049] 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.

[0050] like Figure 3 As shown, a battery chip 11 provided by the present invention includes a first peripheral side surface 114 and a second peripheral side surface 115. A plurality of first fine grid lines 112 and second fine grid lines 113 are arranged on the back of the battery chip 11. The back of the battery chip 11 refers to a side of the battery chip 11 away from the sun when in use. The battery chip 11 includes a body 111. The first fine grid lines 112 and the second fine grid lines 113 are located on the back side of the body 111. The lengths of the first fine grid lines 112 and the second fine grid lines 113 both extend along the first direction. The first fine grid lines 112 and The second fine grid lines 113 are arranged alternately and spaced along the second direction, the first direction and the second direction are perpendicular, the first direction is parallel to the X direction shown in the figure, the second direction is parallel to the Y direction shown in the figure, the distance between the end of the first fine grid line 112 and the first peripheral side surface 114 is L1, the distance between the end of the first fine grid line 112 and the second peripheral side surface 115 is L2, the distance between the end of the second fine grid line 113 and the first peripheral side surface 114 is L3, the distance between the end of the second fine grid line 113 and the second peripheral side surface 115 is L4, L1>L3>0mm, L4>L2>0mm. In the figure, the first grid lines 112 and the second grid lines 113 are distinguished by using profile lines with different densities and directions.

[0051] By setting L1>L3>0mm, L4>L2>0mm, that is, the ends of the first fine gate line 112 and the second fine gate line 113 are not flush, referring to Figure 4When the first protruding end 1121 of the first fine grid line 112 of the battery chip 11 is used for circuit connection, since L4>L2, the second shortened end 1132 of the second fine grid line 113 of the battery chip 11 has enough space to accommodate the circuit connector, and the second fine grid line 113 of the battery chip 11 can be insulated from the circuit connector by means of space interval, without the need for additional insulating parts. Similarly, when the second protruding end 1131 of the second fine grid line 113 of the battery chip 11 is used for circuit connection, since L1>L3, the first shortened end 1122 of the first fine grid line 112 of the battery chip 11 has enough space to accommodate the circuit connector. The first fine grid line 112 of the battery chip 11 can be insulated from the circuit connector by means of space intervals, without the need for additional insulating components, and the first fine grid line 112 and the second fine grid line 113 can be directly connected to the circuit connector, respectively. In this way, the battery chip 11 of this embodiment does not need to be provided with a main grid line structure. Compared with the traditional battery chip 11, the battery chip 11 of this embodiment no longer has a main grid line structure, which can save the amount of grid line silver paste and reduce the manufacturing cost of the battery chip 11. The structural design of the battery chip 11 can reduce the use of insulating components and reduce the manufacturing cost of the battery chip 11.

[0052] The figure is a simplified diagram of the battery chip 11. Only two first fine grid lines 112 and two second fine grid lines 113 are drawn on each battery chip 11 in the figure. In actual products, the number of first fine grid lines 112 and second fine grid lines 113 on the battery chip 11 is not limited by the number shown in the figure. A plurality of first fine grid lines 112 and second fine grid lines 113 on the battery chip 11 can be set, for example, 50, 100, 200, etc.

[0053] In this embodiment, the battery chip 11 further includes a third peripheral side surface and a fourth peripheral side surface, the third peripheral side surface and the fourth peripheral side surface are perpendicular to the first peripheral side surface 114, the first peripheral side surface 114 and the second peripheral side surface 115 are parallel, that is, in this embodiment, the first direction and the second direction are perpendicular, and the battery chip 11 is rectangular. By providing rectangular battery chips 11, the battery chips 11 can be arranged in an array, so that the battery chips 11 are arranged in an orderly manner, and when arranging the battery chips 11, the peripheral side surfaces of two adjacent battery chips 11 can be closely attached, thereby minimizing the spacing between the battery chips 11, and also facilitating the circuit connection between the circuit connector and the fine grid lines on the battery chip 11.

[0054] Reference Figure 2 and Figure 3, L1=L4, L3=L2, that is, the distance between the end of the first fine grid line 112 and the first peripheral side surface 114 is equal to the distance between the end of the second fine grid line 113 and the second peripheral side surface 115, and the distance between the end of the second fine grid line 113 and the first peripheral side surface 114 is equal to the distance between the end of the first fine grid line 112 and the second peripheral side surface 115. By setting L1=L4, L3=L2, the two ends of the first fine grid line 112 and the second fine grid line 113 on the battery chip 11 are at the same distance from the edge of the battery chip 11, which can facilitate the subsequent connection between the first fine grid line 112 and the second fine grid line 113 on the battery chip 11 and the circuit connector.

[0055] Furthermore, on each battery chip 11, the ends of all the first thin grid lines 112 are aligned, and the ends of all the second thin grid lines 113 are aligned. On each battery chip 11, the ends of all the first thin grid lines 112 are aligned, and the ends of all the second thin grid lines 113 are aligned, which can facilitate the subsequent connection between the battery chip 11 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.

[0056] like Figure 1 and Figure 2 As shown, the present invention provides a dual-divided battery cell 1, the back side of the dual-divided battery cell 1 has two wiring areas 101 arranged along a first direction (the first direction is parallel to the X direction shown in the figure), the wiring forms in the two wiring areas 101 are consistent, and a cutting point 102 is arranged between the two wiring areas 101. In this embodiment, the cutting point 102 is a straight line, and the two wiring areas 101 are spaced apart from the cutting point 102. The dual-divided battery cell 1 can be cut into two battery chips 11 in the above-mentioned embodiments, and the arrangement directions of the two battery chips 11 are the same. By setting the two wiring areas 101 on the dual-divided battery cell 1 to be spaced apart from the cutting position 102, hard contact between the cutter and the gate line can be avoided, so that the gate line can be prevented from pressing the dual-divided battery cell 1 during the cutting process, causing hidden cracks in the silicon substrate of the dual-divided battery cell 1; by setting the wiring forms in the two wiring areas 101 to be consistent, that is, the first fine gate line 112 in one wiring area 101 and the first fine gate line 112 in the other wiring area are located on the same straight line, and the second fine gate line 113 in one wiring area 101 and the second fine gate line 113 in the other wiring area 101 are located on the same straight line, this can reduce the manufacturing difficulty of the dual-divided battery cell 1, thereby reducing costs.

[0057] Reference Figure 4 , Figure 5 , Figure 6 and Fig.17The present embodiment further provides a solar cell series unit, comprising a series adhesive strip 21 and a battery chip 11 in any of the above embodiments, wherein the series adhesive strip 21 is a conductive adhesive strip 2, and the series adhesive strip 21 is located on the back of the battery chip 11, the series adhesive strip 21 is connected to the first protruding end 1121 of one of the battery chips 11, and the second fine grid line 113 on the battery chip 11 is spaced from the series adhesive strip 21, and the series adhesive strip 21 is connected to the second protruding end 1131 on another battery chip 11, and the first fine grid line 112 on the battery chip 11 is spaced from the series adhesive strip 21.

[0058] It should be noted that the battery chips 11 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 , the two battery chips 11 are arranged along the first direction, referring to Fig.17 , the two battery chips 11 are arranged along the second direction.

[0059] The conductive adhesive strip 2 (series adhesive strip 21) in this embodiment is the circuit connector mentioned in the above embodiment. By setting the conductive adhesive strip 2, the conductive adhesive strip 2 can make the battery chips 11 electrically conductive, so as to realize the collection of current; the conductive adhesive strip 2 is a flexible member, and the hardness of the conductive adhesive strip 2 is much smaller than the hardness of the battery chip 11. The conductive adhesive strip 2 does not have a hard contact with the battery chip 11, so that the problem of hidden cracks in the battery chip 11 caused by pressure due to hard contact can be avoided; because the conductive adhesive strip 2 is sticky, it can be directly pasted on the battery chip 11, and 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 11 caused by the welding process; because the conductive adhesive strip 2 is sticky, it can be directly pasted on the battery chip 11. Therefore, when arranging the battery chips 11, there is no need to reserve space for placing the bus bar and welding, so that the battery chips 11 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 11 are arranged 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 2 is used for circuit connection, and the gram weight of the conductive adhesive strip 2 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 2, the thin grid lines that do not need to be connected in the battery chip 11 can be insulated from the conductive adhesive strip 2 by means of spatial spacing, so as to avoid short circuits in the battery chip 11. The conductive adhesive strip 2 is set on the back side of the main body 111, and the back side of the main body 111 directly supports the conductive adhesive strip 2. On the one hand, the difficulty of laying the adhesive can be reduced. On the other hand, the conductive adhesive strip 2 does not need to be set between the battery chips 11, so that the battery chips 11 can be arranged more closely and the distance between the battery chips 11 can be reduced.

[0060] Reference Fig. 9 , Fig.10 , Fig.12 and Fig.13 This embodiment also provides a solar cell parallel unit, including a parallel adhesive strip 22 and a battery chip 11 in any of the above embodiments, the parallel adhesive strip 22 is a conductive adhesive strip 2, and the parallel adhesive strip 22 is located on the back of the battery chip 11, referring to Fig. 9 and Fig.12In one embodiment, the first fine grid lines 112 of the two battery chips 11 are connected, the parallel adhesive strips 22 are respectively connected to the first protruding ends 1121 on the two battery chips 11, and the second fine grid lines 113 on the battery chips 11 are spaced from the parallel adhesive strips 22. Fig.10 and Fig.13 In another embodiment, the second fine grid lines 113 of the two battery chips 11 are connected, the parallel adhesive strips 22 are respectively connected to the second protruding ends 1131 on the two battery chips 11, and the first fine grid lines 112 on the battery chips 11 are spaced apart from the parallel adhesive strips 22.

[0061] The conductive adhesive strip 2 (parallel adhesive strip 22) in this embodiment is the circuit connector mentioned in the above embodiment. By setting the conductive adhesive strip 2, the conductive adhesive strip 2 can make the battery chips 11 electrically connected, so as to realize the collection of current; the conductive adhesive strip 2 is a flexible member, and the hardness of the conductive adhesive strip 2 is much smaller than the hardness of the battery chip 11. The conductive adhesive strip 2 will not have a hard contact with the battery chip 11, so that the problem of hidden cracks in the battery chip 11 caused by hard contact can be avoided; because the conductive adhesive strip 2 is sticky, it can be directly pasted on the battery chip 11, and 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 11 caused by the welding process; because the conductive adhesive strip 2 is sticky, it can be directly pasted on the battery chip 11. Therefore, when arranging the battery chips 11, there is no need to reserve space for placing the bus bar and welding, so that the battery chips 11 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; because the battery chips 11 can be 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 2 is used for circuit connection, and the gram weight of the conductive adhesive strip 2 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 2 to be spaced, the thin grid lines that do not need to be connected in the battery chip 11 can be insulated from the conductive adhesive strip 2 by means of spatial spacing, so as to avoid short circuits in the battery chip 11; the conductive adhesive strip 2 is set on the back side of the main body 111, and the back side of the main body 111 directly supports the conductive adhesive strip 2. On the one hand, the difficulty of laying glue can be reduced, and on the other hand, the conductive adhesive strip 2 does not need to be set between the battery chips 11, so that the battery chips 11 can be arranged more tightly and the distance between the battery chips 11 can be reduced.

[0062] It should be noted that the battery chips 11 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 and Fig.10 , the two battery chips 11 can be arranged along the first direction, referring to Fig.12 and Fig.13 , the two battery chips 11 can be arranged along the second direction.

[0063] Reference Fig.14 and Fig.15 This embodiment also provides a solar cell assembly, which includes the above-mentioned solar cell series connection unit and solar cell parallel connection unit. Of course, referring to Fig.11 The solar cell module may only include the solar cell series unit but not the solar cell parallel unit, or the solar cell module 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 battery pieces 11 can be arranged more closely, the size of the shell and other parts of the solar cell module can also 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 also reduce the overall size and weight of the solar cell module accordingly, which can reduce the transportation cost of the solar cell module.

[0064] Further, see Fig.16, along the first direction, the distance between the lateral sides of two adjacent battery chips 11 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 11 can be fitted or spaced, and the maximum spacing distance between two adjacent battery chips 11 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 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. Of course, along the second direction, the distance between the peripheral sides of two adjacent battery chips 11 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 chips 11 are close to each other. For example, along the second direction, there is a gap of 0.5mm between the circumferential sides of two adjacent battery pieces 11. For example, when W1=0mm and W2=0mm, along the first direction, the circumferential sides of two adjacent battery pieces 11 are in contact with each other, and along the second direction, the circumferential sides of two adjacent battery pieces 11 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 sides of two adjacent battery pieces 11, and along the second direction, there is a gap of 0.8mm between the circumferential sides of two adjacent battery pieces 11.

[0065] It should be noted that when the conductive strip 2 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 11. When the conductive glue is directly coated on the surface of the battery pieces to solidify the conductive strip 2, the values ​​of W1 and W2 are both 0 mm, that is, the battery pieces 11 need to be fitted together.

[0066] Preferably, the peripheral side surfaces of two adjacent battery chips 11 are bonded. Since the ends of the first fine grid line 112 and the second fine grid line 113 are spaced from the edge of the battery chip 11, when the two battery chips 11 are tightly bonded, the fine grid lines on the two battery chips 11 will not directly contact each other, and will not cause a short circuit problem between the battery chips 11. Therefore, the peripheral side surfaces of two adjacent battery chips 11 can be bonded to reduce the spacing between the battery chips 11.

[0067] Further, see Figure 4 The solar cell assembly includes battery chips 11 arranged in a first direction and connected in series, wherein a first peripheral side surface 114 of one battery chip 11 is attached to a second peripheral side surface 115 of an adjacent battery chip 11, so that a first protruding end 1121 on one battery chip 11 is adjacent to a second protruding end 1131 on another battery chip 11.

[0068] Reference Fig. 9 The solar cell assembly also includes battery chips 11 arranged in parallel along a first direction, and the first peripheral side surfaces 114 of the two battery chips 11 are attached to each other so that the second protruding ends 1131 of the second fine grid lines 113 on the two battery chips 11 are adjacent to each other, or the second peripheral side surfaces 115 of the two battery chips 11 are positioned opposite to each other so that the first protruding ends 1121 of the two battery chips 11 are adjacent to each other.

[0069] Reference Fig.10 The solar cell assembly also includes battery chips 11 arranged in a second direction and connected in series, wherein a first peripheral side surface 114 of one battery chip 11 is flush with a second peripheral side surface 115 of another battery chip 11, so that all first fine grid lines 112 and second fine grid lines 113 on the two battery chips 11 are located on the same straight line.

[0070] Reference Fig.12 and Fig.13 The solar cell assembly also includes battery chips 11 arranged in parallel along the second direction, and the first peripheral side surfaces 114 of the two battery chips 11 are aligned so that all the second protruding ends 1131 on the two battery chips 11 are located on the same straight line, or the second peripheral side surfaces 115 of the two battery chips 11 are aligned so that all the first protruding ends 1121 on the two battery chips 11 are located on the same straight line.

[0071] In this embodiment, the battery chips 11 formed by cutting the double-divided battery sheet 1 are completely identical, that is, the arrangement of the first fine grid lines 112 and the second fine grid lines 113 on each battery chip 11 is the same. Therefore, this arrangement can facilitate the series and parallel connection between the battery chips 11.

[0072] Furthermore, the series rubber strip 21 includes a first series portion 211 and a second series portion 212, and the first series portion 211 and the second series portion 212 are respectively connected to the fine grid lines on the two battery chips 11. Of course, the parallel rubber strip 22 may also include a first parallel portion 221 and a second parallel portion 222, and the first parallel portion 221 and the second parallel portion 222 are respectively connected to the fine grid lines on the two battery chips 11. In this embodiment, the series rubber strip 21 and the parallel rubber strip 22 are integrally formed. By arranging the series rubber strip 21 and the parallel rubber strip 22 to be integrally formed, on the one hand, the electrical connection stability between the two battery chips 11 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 first series portion 211 and the second series portion 212 of the series adhesive strip 21 may be independent, and the two are bonded together by their own adhesion. Of course, the parallel adhesive strip 22 may also have a first parallel portion 221 and a second parallel portion 222, and the first parallel portion 221 and the second parallel portion 222 are respectively bonded to two battery chips 11. The first parallel portion 221 and the second parallel portion 222 may be independent, and the two are bonded together by their own adhesion.

[0073] Preferably, the center of the conductive adhesive strip 2 is aligned with the splicing edge of the two battery chips 11. By aligning the center of the conductive adhesive strip 2 with the splicing edge of the two battery chips 11, that is, the bonding area of ​​the conductive adhesive strip 2 and the two battery chips 11 is consistent, so that the bonding stability of the conductive adhesive strip 2 and each battery chip 11 can be guaranteed to the greatest extent, and peeling between the conductive adhesive strip 2 and the battery chip 11 can be avoided.

[0074] Reference Figure 4 , the two battery chips 11 are arranged along the first direction, the width center of the conductive rubber strip 2 is aligned with the splicing edge of the two battery chips 11, and the maximum width of the conductive rubber strip 2 is D, 0.5D<L4, and 0.5D<L1. By setting 0.5D<L4 and 0.5D<L1, the conductive rubber strip 2 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.

[0075] 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.

[0076] Reference Figures 1 to 14 This embodiment also provides a method for manufacturing a solar cell assembly, which is used to manufacture the solar cell assembly in any of the above embodiments. First, it is necessary to provide a double-split cell sheet 1 in any of the above embodiments, comprising the following steps:

[0077] Step 100, cutting along the cutting position 102 of the double-divided battery sheet 1 to separate the double-divided battery sheet 1 into battery small sheets 11;

[0078] Step 200, arranging the battery chips 11;

[0079] Step 300 , forming a conductive adhesive strip 2 on the battery chips 11 , so that the battery chips 11 are connected in series to form the above-mentioned solar cell series unit, and the battery chips 11 are connected in parallel to form the above-mentioned solar cell parallel unit.

[0080] By arranging the battery chips 11 first and then forming the conductive rubber strip 2 , the forming of the conductive rubber strip 2 can be facilitated and the production efficiency can be improved.

[0081] In this embodiment, in the battery series unit and the battery parallel unit, two battery cells 11 arranged along the first direction are separated from the same two-divided battery cell 1 .

[0082] Reference Figures 7 to 9 When two battery pieces 11 separated from the same double-divided battery sheet 1 are connected in parallel, after cutting the double-divided battery sheet 1, one of the battery pieces 11 is first rotated 180° so that the first peripheral side surfaces 114 of the two battery pieces 11 are attached to the first peripheral side surfaces 114 of the other battery piece 11, or the second peripheral side surfaces 115 of the two battery pieces 11 are attached, and then the conductive adhesive strip 2 is formed.

[0083] When two battery small pieces 11 separated from the same double-divided battery sheet 1 are connected in series, after the double-divided battery sheet 1 is cut, the two battery small pieces 11 are directly spliced ​​together, and then the conductive adhesive strip 2 is formed.

[0084] Reference Fig.11 When the four battery pieces 11 formed by separating two bipartitioned battery sheets 1 are connected in series, in one embodiment, before cutting the bipartitioned battery sheets 1, one of the bipartitioned battery sheets 1 is first rotated 180°, and then the bipartitioned battery sheets 1 are cut, and then the battery pieces 11 are directly spliced. In another embodiment, the bipartitioned battery sheets 1 can be cut first, and then the two battery pieces 11 belonging to the same bipartitioned battery sheet 1 are each rotated 180°, and then the battery pieces 11 are spliced.

[0085] The rotation of the battery pieces 11 needs to be selected according to the actual connection method between the battery pieces 11 .

[0086] The conductive strip 2 can be formed by curing conductive glue or by cutting conductive tape. In one embodiment, the conductive strip 2 is formed by curing conductive glue. Then, the conductive glue can be applied to a preset position on the battery chip 11, and the conductive strip 2 is formed after the conductive glue is cured. In another embodiment, the conductive tape can be cut into shape first, and then the conductive tape can be pasted at a preset position on the battery chip 11 to form the conductive strip 2.

[0087] In this embodiment, during assembly, the tempered glass of the solar cell assembly is first inverted, and then the battery chips 11 are arranged on the tempered glass. After the arrangement is completed, the conductive adhesive strip 2 is formed on the battery chips 11 to connect the battery chips 11. Then, the adhesive film blank and the back plate are stacked in sequence on the battery chips 11, and the back plate is pressed under high temperature conditions so that the adhesive film blank is melted by heat, wraps the battery chips 11 and fills 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°.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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 chip, comprising a first peripheral side surface and a second peripheral side surface, a plurality of first fine grid lines and a plurality of second fine grid lines are arranged on the back of the battery chip, the lengths of the first fine grid lines and the second fine grid lines are both extended along a first direction, and the first fine grid lines and the second fine grid lines are alternately arranged along a second direction, characterized in that: The first fine gate line includes a first protruding end and a first shortened end, the second fine gate line includes a second protruding end and a second shortened end, the distance between the first shortened end and the first peripheral side surface is L1, the distance between the first protruding end and the second peripheral side surface is L2, the distance between the second protruding end and the first peripheral side surface is L3, and the distance between the second shortened end and the second peripheral side surface is L4, L1>L3>0mm, L4>L2>0mm; the first fine gate line is a positive electrode, and the second fine gate line is a negative electrode.

2. The battery chip according to claim 1, characterized in that: The battery chip further includes a third peripheral side surface and a fourth peripheral side surface, wherein the third peripheral side surface and the fourth peripheral side surface are perpendicular to the first peripheral side surface, and the first peripheral side surface and the second peripheral side surface are parallel; and / or, All ends of the first thin gate lines are aligned, and all ends of the second thin gate lines are aligned.

3. A dual-cell battery, characterized in that: The back side of the dual-cell sheet has a cutting portion, and the dual-cell sheet can be cut into two battery chips as claimed in claim 1 or 2 at the cutting portion, and the two battery chips are arranged in the same direction.

4. A solar cell series unit, characterized in that: It comprises a series adhesive strip and two battery chips as described in claim 1 or 2, wherein the series adhesive strip is a conductive adhesive strip, the series adhesive strip is located on the back of the battery chips, the series adhesive 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 adhesive strip, the series adhesive strip is connected to the second protruding end on the other battery chip, and the first fine grid line on the other battery chip is spaced from the series adhesive strip.

5. A solar cell parallel unit, characterized in that: It includes a parallel rubber strip and two battery chips as described in claim 1 or 2, wherein the parallel rubber strip is a conductive rubber strip, the parallel rubber strip is located on the back of the battery chip, the parallel rubber strip is respectively connected to the first protruding ends of the two battery chips, and the second fine grid lines on the battery chips are spaced apart from the parallel rubber strip, or the parallel rubber strip is respectively connected to the second protruding ends of the two battery chips, and the first fine grid lines on the battery chips are spaced apart from the parallel rubber strip.

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: The two battery chips in the solar cell series unit are arranged along a first direction, or the two battery chips in the solar cell series unit are arranged along a second direction; the first direction is perpendicular to the second direction; The two battery chips in the solar cell parallel unit are arranged along the first direction, or the two battery chips in the solar cell parallel unit are arranged along the second direction; The distance between the circumferential side surfaces of two adjacent battery chips along the first direction is W1, 0mm≤W1≤1.3mm.

8. The solar cell assembly according to claim 7, characterized in that: It comprises two battery chips arranged along the 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 double-divided battery sheet as claimed in claim 3 to separate the double-divided battery sheet into battery small sheets as claimed in claim 1 or 2; 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 the solar cell series unit of claim 4 , and to connect the battery chips in parallel to form the solar cell parallel unit of claim 5 .

10. The method for manufacturing a solar cell module according to claim 9, characterized in that: The solar cell series connection unit comprises the following forming steps: after cutting the two-divided solar cell sheet, directly splicing the two solar cell sheets, and then forming the conductive adhesive strip; The solar cell parallel unit comprises the following molding steps: after cutting the two-divided cell sheets, firstly rotating one of the cell sheets by 180° so that the first side surfaces / second side surfaces of the two cell sheets are attached to each other, and then molding the conductive adhesive strip.

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