Battery piece assembly and manufacturing method thereof, battery string and photovoltaic power generation system

Abstract

The invention discloses a battery piece assembly and a manufacturing method thereof, a battery string and a photovoltaic power generation system, and the manufacturing method of the battery piece assembly comprises the following steps: arranging a plurality of first electric connection assemblies and a plurality of second electric connection assemblies on a battery piece, the first connecting assembly comprises first connecting lines, the first connecting lines are electrically connected with a plurality of second grid lines of the battery piece respectively, the first connecting lines and the first grid lines are spaced in the Z direction, the second connecting assembly comprises second connecting lines, the first connecting lines and the second connecting lines are arranged at intervals in the X direction, and the second connecting lines are electrically connected with a plurality of first grid lines of the battery piece respectively. And a gap is formed between the second connecting line and the second grid line along the Z direction. According to the manufacturing method of the battery piece assembly, the manufacturing method is simple, and the steps are simplified, so that the production efficiency of the battery piece assembly is improved, and short circuit of the battery piece assembly is avoided.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a cell sheet assembly and a manufacturing method thereof, a cell string and a photovoltaic power generation system. Background Art

[0002] In the development of photovoltaic modules, Perc cells, Topcon cells, HJT cells, etc. were produced one after another. Subsequently, back-contact solar cells (BC cells) were produced. The BC cell has no obstructions such as grid lines and solder strips on the front of the cell, which increases the photocurrent. Among them, the positive grid lines, negative grid lines and solder strips are all on the back of the cell of the BC cell. In the related technology, the preparation method of the battery is complicated and short circuits are prone to occur. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a method for manufacturing a battery cell assembly, which is simple and simplifies the steps, thereby improving the production efficiency of the battery cell assembly and avoiding short circuits in the battery cell assembly.

[0004] The second object of the present invention is to provide a battery cell assembly prepared by the above-mentioned battery cell assembly manufacturing method.

[0005] The third object of the present invention is to provide a battery string using the above-mentioned battery cell assembly.

[0006] A fourth objective of the present invention is to provide a photovoltaic power generation system using the above-mentioned battery string.

[0007] According to a method for manufacturing a battery cell assembly of an embodiment of the first aspect of the present invention, the method comprises the following steps: arranging a plurality of first electrical connection assemblies and a plurality of second electrical connection assemblies on a battery cell: the first electrical connection assemblies comprise first connection lines, the first connection lines are electrically connected to a plurality of second grid lines of the battery cell respectively, the first connection lines are spaced apart from the first grid lines along the Z direction, the second electrical connection assemblies comprise second connection lines, the first connection lines and the second connection lines are spaced apart along the X direction, the second connection lines are electrically connected to a plurality of first grid lines of the battery cell respectively, and the second connection lines are spaced apart from the second grid lines along the Z direction; wherein the plurality of first grid lines, the plurality of second grid lines, the plurality of first electrical connection assemblies and the plurality of second electrical connection assemblies are all arranged on one side surface in the thickness direction of the battery cell, the plurality of first grid lines and the plurality of second grid lines are alternately spaced apart along the Y direction, the first grid lines and the second grid lines have opposite polarities, and the X direction, the Y direction and the Z direction are orthogonal.

[0008] According to the cell assembly of the present invention, by adopting the above-mentioned manufacturing steps, the first connecting wire is separated from the plurality of first grid lines for insulation, and the second connecting wire is separated from the plurality of second grid lines for insulation, so as to avoid short circuit during the manufacturing process of the cell assembly, thereby improving the performance of the cell assembly. In addition, while ensuring that the cell assembly can be used normally, the manufacturing steps are simple and easy to implement, and the use of other structural parts for insulation is avoided, which simplifies the manufacturing steps, thereby reducing the difficulty of producing the cell assembly, and further improving the production yield and efficiency of the cell assembly. In addition, the use of other components is reduced, and the amount of materials used for other components is reduced, thereby reducing the production cost of the cell assembly.

[0009] According to some embodiments of the present invention, the first connecting line includes a plurality of first connecting segments, the first electrical connection assembly also includes a plurality of first connecting parts, the plurality of first connecting segments and the plurality of first connecting parts are electrically connected in sequence, and the plurality of first connecting parts are electrically connected to the plurality of second gate lines respectively; the second connecting line includes a plurality of second connecting segments, the second electrical connection assembly also includes a plurality of second connecting parts, the plurality of second connecting segments and the plurality of second connecting parts are electrically connected in sequence, and the plurality of second connecting parts are electrically connected to the plurality of first gate lines respectively; the provision of the plurality of first electrical connection assemblies and the plurality of second electrical connection assemblies on the battery cell specifically includes: printing the first gate lines and the second gate lines on the surface of the one side in the thickness direction of the battery cell; providing the plurality of second connecting parts on the plurality of first gate lines, and providing the plurality of first connecting parts on the second gate lines, wherein the plurality of first connecting parts of each first electrical connection assembly are opposite to each other along the Y direction, the plurality of second connecting parts of each second electrical connection assembly are opposite to each other along the Y direction, the first connecting segment is connected between two adjacent first connecting parts along the Y direction, and the second connecting segment is connected between two adjacent second connecting parts along the Y direction.

[0010] According to some embodiments of the present invention, the first connecting component is screen printed or vapor deposited on the side of the corresponding second grid line away from the battery cell, and the second connecting component is screen printed or vapor deposited on the side of the corresponding first grid line away from the battery cell.

[0011] According to some embodiments of the present invention, the vapor deposition includes physical vapor deposition or chemical vapor deposition.

[0012] According to some embodiments of the present invention, the first connecting line includes a plurality of first connecting segments, the first electrical connection assembly also includes a plurality of first connecting parts, the plurality of first connecting segments and the plurality of first connecting parts are electrically connected in sequence, and the plurality of first connecting parts are electrically connected to the plurality of second gate lines respectively; the second connecting line includes a plurality of second connecting segments, the second electrical connection assembly also includes a plurality of second connecting parts, the plurality of second connecting segments and the plurality of second connecting parts are electrically connected in sequence, and the plurality of second connecting parts are electrically connected to the plurality of first gate lines respectively; the provision of the plurality of first electrical connection assemblies and the plurality of second electrical connection assemblies on the battery cell specifically includes: synchronously screen printing the first gate line, the second gate line, the first connecting part and the second connecting part on the surface of the one side in the thickness direction of the battery cell; connecting the first connecting segment between two adjacent first connecting parts along the Y direction, and connecting the second connecting segment between two adjacent second connecting parts along the Y direction.

[0013] According to some embodiments of the present invention, after providing a plurality of the first connecting components and a plurality of the second connecting components, the method further includes: providing a first protective layer on the outer circumference of the first connecting component; and / or providing a second protective layer on the outer circumference of the second connecting component.

[0014] According to some embodiments of the present invention, the first protective layer and / or the second protective layer are provided by printing or electroplating.

[0015] According to some embodiments of the present invention, the first connecting section and the first connecting component are formed into an integrated structure through a bonding process; and / or the second connecting section and the second connecting component are formed into an integrated structure through a bonding process.

[0016] According to some embodiments of the present invention, the bonding process includes ultrasonic bonding, thermocompression bonding or thermosonic bonding.

[0017] According to some embodiments of the present invention, connecting the first connecting segment between two adjacent first connecting portions along the Y direction and connecting the second connecting segment between two adjacent second connecting portions along the Y direction specifically includes: using a wire welding machine to respectively connect the two ends of the first connecting segment with the corresponding first connecting portions, and using a wire welding machine to respectively connect the two ends of the second connecting segment with the corresponding second connecting portions.

[0018] According to some embodiments of the present invention, the first connecting line and / or the second connecting line includes a pure metal material, a metal-doped precious metal material, or a metal-doped rare earth metal material.

[0019] According to some embodiments of the present invention, a third protective layer is disposed on an outer circumference of the first connecting line; and / or a fourth protective layer is disposed on an outer circumference of the second connecting line.

[0020] According to some embodiments of the present invention, the third protective layer and / or the fourth protective layer is made of tin, lead or bismuth.

[0021] According to the battery cell assembly of the embodiment of the second aspect of the present invention, the battery cell assembly is manufactured by the manufacturing method of the battery cell assembly of the embodiment of the first aspect of the present invention.

[0022] A battery string according to an embodiment of a third aspect of the present invention comprises a battery cell assembly according to an embodiment of the second aspect of the present invention.

[0023] According to some embodiments of the present invention, the second gate lines between two adjacent battery cells are electrically connected via a plurality of the first electrical connection components, and the first gate lines between two adjacent battery cells are electrically connected via a plurality of the second electrical connection components.

[0024] A photovoltaic power generation system according to a fourth embodiment of the present invention comprises a battery string according to the third embodiment of the present invention.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a schematic diagram of a battery cell assembly according to an embodiment of the present invention; Figure 2 is a schematic diagram of a battery cell assembly according to another embodiment of the present invention; Figure 3 yes Figure 2 sectional view of Figure 4 yes Figure 2 A cross-sectional view of another case; Figure 5 is a schematic diagram of a first interconnection portion of a battery cell assembly according to an embodiment of the present invention; Figure 6 yes Figure 5 A schematic diagram of another situation; Figure 7 is a schematic diagram of a battery string according to an embodiment of the present invention.

[0027] Reference numerals: 100. Battery cell assembly; 1. Battery cell; 11. First layer; 12. Second layer; 13. Third layer; 14, fourth floor; 15, fifth floor; 16, sixth floor; 2. first gate line; 21. first gate line segment; 22. first disconnection port; 3. second gate line; 31. second gate line segment; 32. second disconnection port; 4. first electrical connection component; 41. first connection line; 411. first connection section; 42. first connecting member; 43. first interconnecting portion; 44. first interconnecting member; 5. second electrical connection component; 51. second connection line; 511. second connection section; 52. A second connecting member; 6. The third grid line; 200. Battery string. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 6 A method for manufacturing a battery cell assembly 100 according to an embodiment of the first aspect of the present invention is described.

[0029] The method for manufacturing the battery cell assembly 100 according to the first embodiment of the present invention comprises the following steps: S1. A plurality of first electrical connection components 4 and a plurality of second electrical connection components 5 are arranged on the battery cell 1. The first electrical connection components 4 include first connection wires 41, which are electrically connected to a plurality of second grid lines 3 of the battery cell 1, respectively, and the first connection wires 41 are spaced apart from the first grid lines 2 along the Z direction. The second electrical connection components 5 include second connection wires 51, which are spaced apart from the first grid lines 2 along the X direction (such as Figure 1 The second connecting wires 51 are electrically connected to the plurality of first grid lines 2 of the battery cell 1, and there is a gap between the second connecting wires 51 and the second grid lines 3 along the Z direction. In the description of the present invention, "plurality" means two or more.

[0030] Among them, refer to Figure 1 , a plurality of first grid lines 2, a plurality of second grid lines 3, a plurality of first electrical connection components 4 and a plurality of second electrical connection components 5 are all arranged on one side surface of the battery cell 1 in the thickness direction (i.e., the Z direction, also the front-back direction), and a plurality of first grid lines 2 and a plurality of second grid lines 3 are arranged along the Y direction (i.e., Figure 1 The first grid lines 2 and the second grid lines 3 have opposite polarities, and the X direction, the Y direction and the Z direction are orthogonal.

[0031] For example, in Figure 1 In the example, a plurality of first electrical connection components 4 and a plurality of second electrical connection components 5 are arranged alternately in the left-right direction, a plurality of first connection lines 41 and a plurality of second connection lines 51 are arranged alternately in the left-right direction, and the first electrical connection components 4 and the second electrical connection components 5 are both extended in the up-down direction. A plurality of first gate lines 2 and a plurality of second gate lines 3 are arranged alternately in the up-down direction, and the first gate lines 2 and the second gate lines 3 are both extended in the left-right direction. The opposite polarity of the first gate line 2 and the second gate line 3 can be understood as: when the first gate line 2 is a positive gate line, the second gate line 3 is a negative gate line; when the first gate line 2 is a negative gate line, the second gate line 3 is a positive gate line. The current on the plurality of second gate lines 3 is derived through the first connection line 41, and the current on the first gate line 2 is derived through the second connection line 51. Among them, the first gate line 2 and the second gate line 3 can be auxiliary gate lines, respectively.

[0032] by Figure 1 and Figure 3 The battery cell assembly 100 shown is used as an example for explanation. The manufacturing method of the battery cell assembly 100 is roughly as follows: The first connecting wires 41 are arranged roughly in a wave shape. Along the extending direction of the first connecting wires 41, the first connecting wires 41 include a plurality of raised portions and a plurality of recessed portions arranged alternately. The plurality of raised portions of the plurality of first connecting wires 41 are spaced apart from the corresponding plurality of first grid lines 2 along the front-to-back direction (that is, the thickness direction of the battery cell 1), that is, the first connecting wires 2 have a certain gap from the surface of the battery cell 1 and are not in direct contact. The plurality of recessed portions of the first connecting wires 41 are electrically connected to the plurality of second grid lines 3, respectively.

[0033] The second connecting wires 51 are arranged roughly in a wave shape. Along the extending direction of the second connecting wires 51, the second connecting wires 51 include a plurality of raised portions and a plurality of recessed portions arranged alternately. The plurality of raised portions of the plurality of second connecting wires 51 are respectively spaced apart from the corresponding plurality of second grid lines 3 along the front-to-back direction (i.e., the thickness direction of the battery cell 1). The second connecting wires 3 have a certain gap with the surface of the battery cell 1 and are not in direct contact. The plurality of recessed portions of the second connecting wires 51 are respectively electrically connected to the plurality of corresponding first grid lines 2.

[0034] Thus, by adopting the above steps, the plurality of first connecting wires 41 are respectively separated from the corresponding plurality of first grid lines 2 for insulation, and the plurality of second connecting wires 51 are respectively separated from the corresponding plurality of second grid lines 3 for insulation, thereby avoiding the occurrence of short circuit in the cell assembly 100 and improving the reliability of the use of the cell 1. In addition, by adopting the above manufacturing method, the manufacturing method is simple and easy to implement, and there is no need to use other structural members (such as insulating glue) to insulate the first connecting wire 41 from the first grid line 2, and there is no need to use other structural members to insulate the second connecting wire 51 from the second grid line 3, which reduces the manufacturing steps of the cell assembly 100, thereby reducing the manufacturing difficulty of the cell assembly 100, and further improving the yield and efficiency of the production of the cell assembly 100. Moreover, the material usage of other structural members is reduced, and the production cost of the cell assembly 100 is reduced. In addition, the first connecting wire 41 and the second connecting wire 51 are arranged in a spaced relationship with the cell 1 in the front-to-back direction, which reduces the shielding of the first connecting wire 41 and the second connecting wire 51 on the cell 1, thereby improving the photoelectric conversion capacity of the cell assembly 100. The battery cell assembly 100 may or may not use other structural members, and may be specifically configured according to actual usage. The first connecting line 41 may be a line or a plurality of line segments connected end to end, and the second connecting line 51 may be a line or a plurality of line segments connected end to end, and may be configured according to actual usage.

[0035] According to the cell assembly 100 of the present invention, by adopting the above-mentioned manufacturing steps, the first connection line 41 is separated from the plurality of first grid lines 2 for insulation, and the second connection line 51 is separated from the plurality of second grid lines 3 for insulation, so as to avoid short circuit during the manufacturing process of the cell assembly 100, thereby improving the performance of the cell assembly 100. In addition, while ensuring that the cell assembly 100 can be used normally, the manufacturing steps are simple and easy to implement, and the use of other structural parts for insulation is avoided, which simplifies the manufacturing steps, thereby reducing the difficulty of producing the cell assembly 100, and further improving the production yield and efficiency of the cell assembly 100. In addition, the use of other components is reduced, and the amount of materials used for other components is reduced, thereby reducing the production cost of the cell assembly 100.

[0036] According to some embodiments of the present invention, referring to Figure 1 and Figure 3The first connecting line 41 includes a plurality of first connecting segments 411, the first electrical connection assembly 4 also includes a plurality of first connecting parts 42, the plurality of first connecting segments 411 and the plurality of first connecting parts 42 are electrically connected in sequence, and the plurality of first connecting parts 42 are electrically connected to the plurality of second gate lines 3, respectively. The second connecting line 51 includes a plurality of second connecting segments 511, the second electrical connection assembly 5 also includes a plurality of second connecting parts 52, the plurality of second connecting segments 511 and the plurality of second connecting parts 52 are electrically connected in sequence, and the plurality of second connecting parts 52 are electrically connected to the plurality of first gate lines 2, respectively.

[0037] Arranging a plurality of first electrical connection components 4 and a plurality of second electrical connection components 5 on the battery cell 1 (i.e., step S1) specifically includes: S11 , printing the first gate line 2 and the second gate line 3 on the surface of the one side in the thickness direction of the battery cell 1 .

[0038] S12, disposing a plurality of second connection components 52 on the plurality of first gate lines 2, and disposing a plurality of first connection components 42 on the second gate lines 3; The multiple first connection components 42 of each first electrical connection component 4 are opposite to each other along the Y direction, and the multiple second connection components 52 of each second electrical connection component 5 are opposite to each other along the Y direction.

[0039] S13, connecting the first connecting section 411 between two adjacent first connecting components 42 along the Y direction, and connecting the second connecting section 511 between two adjacent second connecting components 52 along the Y direction.

[0040] For example, in Figure 1 and Figure 3 In the example, the first connecting part 42 is arranged on the side of the second grid line 3 away from the battery cell 1. The multiple first connecting parts 42 are arranged at intervals in the up-down direction, and the multiple first connecting parts 42 of the first electrical connection assembly 4 are opposite to each other in the up-down direction. The multiple first connecting sections 411 are located between each two adjacent first connecting parts 42, that is, the upper end of the first connecting section 411 is electrically connected to the rear side surface of one of the two adjacent first connecting parts 42 (that is, the side of the first connecting part 42 away from the battery cell 1 body), and the lower end of the first connecting section 411 is electrically connected to the rear side surface of the other of the two adjacent first connecting parts 42, and the multiple first connecting sections 411 are electrically connected to the corresponding multiple first connecting parts 42 in sequence. The part of the first connecting section 411 located between the above-mentioned two adjacent first connecting parts 42 is tilted, and there is a gap between the first connecting section 411 and the above-mentioned one side surface of the battery cell 1 body along the Z direction, and there is a gap between the first connecting section 411 and the corresponding first grid line 2 along the Z direction. This process is repeated successively to connect each first connection segment 411 in the plurality of first connection segments 411 to two corresponding adjacent first connection components 42 .

[0041] The second connecting member 52 is arranged on the side of the first grid line 2 away from the battery cell 1. The plurality of second connecting members 52 are arranged at intervals in the up-down direction, and the plurality of second connecting members 52 of the second electrical connection assembly 5 are opposite in the up-down direction. The plurality of second connecting segments 511 are located between each two adjacent second connecting members 52, that is, the upper end of the second connecting segment 511 is electrically connected to the rear side surface of one of the two adjacent second connecting members 52 (that is, the side surface of the second connecting member 52 away from the battery cell 1 body), and the lower end of the second connecting segment 511 is electrically connected to the rear side surface of the other of the two adjacent second connecting members 52, and the plurality of second connecting segments 511 are electrically connected to the adjacent plurality of second connecting members 52 in sequence. The first electrical connection assembly 4 and the second electrical connection assembly 5 extend in the up-down direction respectively. The portion of the second connecting segment 511 located between the above-mentioned two adjacent second connecting members 52 is tilted, and there is a gap between the second connecting segment 511 and the above-mentioned one side surface of the battery cell 1 body along the Z direction, and there is a gap between the second connecting segment 511 and the corresponding first grid line 2 along the Z direction. However, the present invention is not limited thereto. For example, the end of the first connection segment 411 may be thickened and electrically connected to the first connection component 42, and the end of the second connection segment 511 may be thickened and electrically connected to the second connection component 52. This process is repeated successively to achieve connection between each second connection segment 511 in the plurality of second connection segments 511 and two corresponding adjacent second connection components 52.

[0042] Thus, by adopting the above-mentioned manufacturing method, the plurality of first grid lines 2 and the plurality of second connecting parts 52 on the battery cell 1 are respectively arranged, and the plurality of second grid lines 3 and the plurality of first connecting parts 42 are respectively arranged, so that it is easy to control the production of the plurality of first grid lines 2 and the plurality of second connecting parts 52 respectively, and it is easy to control the production of the plurality of second grid lines 3 and the plurality of first connecting parts 42 respectively, thereby helping to improve the production accuracy of the first grid lines 2, the second grid lines 3, the first connecting parts 42 and the second connecting parts 52, improve the production yield of the battery cell assembly 100, and further improve the use performance of the battery cell assembly 100. In addition, by sequentially electrically connecting the plurality of first connecting segments 411 and the plurality of first connecting parts 42, the first electrical connection assembly 4 can be connected into a long line, which is convenient for the use of the first electrical connection assembly 4. By sequentially electrically connecting the plurality of second connecting segments 511 and the plurality of second connecting parts 52, the second electrical connection assembly 5 can be connected into a long line, which is convenient for the use of the second electrical connection assembly 5. In addition, the first electrical connection assembly 4 is electrically connected in sequence through a plurality of first connection segments 411 and a plurality of first connection components 42, and the current on the plurality of second grid lines 3 can be led out along the first connection line 41 through the plurality of first connection components 42. The second electrical connection assembly 5 is electrically connected in sequence through a plurality of second connection segments 511 and a plurality of second connection components 52, and the current on the plurality of first grid lines 2 can be led out along the second connection line 51 through the plurality of second connection components 52, so as to realize the current on the battery cell 1, thereby ensuring that the battery cell 1 can be used normally for a long time.

[0043] According to some embodiments of the present invention, the first connecting component 42 is screen printed or vapor deposited on the side of the corresponding second grid line 3 away from the battery cell 1, and the second connecting component 52 is screen printed or vapor deposited on the side of the corresponding first grid line 2 away from the battery cell 1.

[0044] Thus, when the first connecting member 42 is screen-printed on the corresponding second grid line 3, and the second connecting member 52 is screen-printed on the corresponding first grid line 2, screen printing is easy to operate and convenient for production, thereby improving the production efficiency of the cell assembly 100. In addition, the equipment cost of screen printing is low, thereby reducing the production cost of the cell assembly 100. When the first connecting member 42 is vapor-deposited on the corresponding second grid line 3, and the second connecting member 52 is vapor-deposited on the corresponding first grid line 2, the vapor deposition control has a high precision, thereby improving the production precision of the first connecting member 42 and the second connecting member 52, thereby improving the yield rate of the cell assembly 100 production, and further improving the use performance of the cell assembly 100.

[0045] According to some embodiments of the present invention, vapor deposition includes physical vapor deposition or chemical vapor deposition. Therefore, when the first connecting component 42 and the second connecting component 52 are respectively formed by physical vapor deposition, the technical process of physical vapor deposition is simple, has no pollution to the environment, and consumes less materials. The formed first connecting component 42 and the second connecting component 52 are uniform and dense, and the formed first connecting component 42 has a strong bonding force with the corresponding second grid line 3, and the formed second connecting component 52 has a strong bonding force with the corresponding first grid line 2, thereby improving the use stability of the battery cell assembly 100, so that the battery cell assembly 100 can be used normally for a long time. When the first connecting component 42 and the second connecting component 52 are respectively formed by chemical vapor deposition, the formed first connecting component 42 and the second connecting component 52 have good uniformity and a high production rate, which is suitable for the rapid preparation of the first connecting component 42 and the second connecting component 52 of a large area, thereby improving the production efficiency of the first connecting component 42 and the second connecting component 52, and improving the production efficiency of the battery cell assembly 100. However, it is not limited to this. For example, the first connecting component 42 and the second connecting component 52 can also be set by plasma enhanced chemical vapor deposition. The deposition temperature of plasma enhanced chemical vapor deposition is low, and the effect on the structure and physical properties of the first gate line 2 and the second gate line 3 is small; the deposition rate is fast; the composition uniformity of the first connecting component 42 and the second connecting component 52 is good; the first connecting component 42 and the second connecting component 52 are dense and have few pinholes; the first connecting component 42 and the second connecting component 52 have strong adhesion, thereby improving the production quality of the first connecting component 42 and the second connecting component 52.

[0046] According to some embodiments of the present invention, referring to Figure 1 The first connecting line 41 includes a plurality of first connecting segments 411, the first electrical connection assembly 4 also includes a plurality of first connecting parts 42, the plurality of first connecting segments 411 and the plurality of first connecting parts 42 are electrically connected in sequence, and the plurality of first connecting parts 42 are electrically connected to the plurality of second gate lines 3, respectively. The second connecting line 51 includes a plurality of second connecting segments 511, the second electrical connection assembly 5 also includes a plurality of second connecting parts 52, the plurality of second connecting segments 511 and the plurality of second connecting parts 52 are electrically connected in sequence, and the plurality of second connecting parts 52 are electrically connected to the plurality of first gate lines 2, respectively.

[0047] Arranging a plurality of first electrical connection components 4 and a plurality of second electrical connection components 5 on the battery cell 1 (i.e., step S1) specifically includes: S11′, synchronously screen-printing the first gate line 2, the second gate line 3, the first connecting component 42 and the second connecting component 52 on the one side surface in the thickness direction of the battery cell 1; S12′, connecting the first connecting section 411 between two first connecting portions adjacent to each other along the Y direction, and connecting the second connecting section 511 between two second connecting portions adjacent to each other along the Y direction.

[0048] Thus, by adopting the above-mentioned preparation method, the first grid lines 2, the second grid lines 3, the first connecting parts 42 and the second connecting parts 52 on the battery cell 1 are produced simultaneously, which further reduces the production steps of the battery cell assembly 100, thereby further improving the production efficiency of the battery cell assembly 100. Among them, the materials of the plurality of first grid lines 2 and the plurality of second connecting parts 52 are the same, and the materials of the plurality of second grid lines 3 and the plurality of first connecting parts 42 are the same, so as to realize the simultaneous production of the first grid lines 2 and the second connecting parts 52, and realize the simultaneous production of the first grid lines 2 and the first connecting parts 42. It should be noted that before the first grid lines 2 and the second grid lines 3 are provided on the battery cell 1, the battery cell 1 needs to be textured and passivated.

[0049] According to some embodiments of the present invention, after providing a plurality of first connecting components 42 and a plurality of second connecting components 52 (ie, step S12 or step S11′), the method further includes: A first protective layer (not shown) is provided on the outer circumference of the first connecting member 42 ; and / or a second protective layer (not shown) is provided on the outer circumference of the second connecting member 52 .

[0050] For example, the first protective layer and the second protective layer may be provided in the following cases: First, the first protective layer is provided on the outer peripheral surface of the first connecting component 42. Second, the second protective layer is provided on the outer peripheral surface of the second connecting component 52. Third, the first protective layer is provided on the outer peripheral surface of the first connecting component 42. At the same time, the second protective layer is provided on the outer peripheral surface of the second connecting component 52.

[0051] With such a configuration, when the bonding ability between the first connecting section 411 and the first connecting component 42 is poor, the bonding ability between the first connecting section 411 and the first connecting component 42 can be enhanced by the first protective layer on the outer peripheral surface of the first connecting component 42, so that bonding is easy or the bonding effect is better. In addition, when the bonding ability between the second connecting section 511 and the second connecting component 52 is poor, the bonding ability between the second connecting section 511 and the second connecting component 52 can be enhanced by the second protective layer on the outer peripheral surface of the second connecting component 52, so that bonding is easy or the bonding effect is better. In addition, the first protective layer on the outer peripheral surface of the first connecting component 42 can protect the first connecting component 42, and the second protective layer on the outer peripheral surface of the second connecting component 52 can protect the second connecting component 52, thereby avoiding corrosion and extending the service life. It should be noted that the material of the first protective layer and the second protective layer can be tin, lead or bismuth, so as to improve the physical or chemical properties such as strength and corrosion resistance of the first electrical connection component 4 and the second electrical connection component 5. But not limited to this, for example, the outer peripheral surface of the first connecting component 42 can form multiple first protective layers, and the outer peripheral surface of the second connecting component 52 can form multiple second protective layers. The number of first protective layers and second protective layers can be specifically set according to actual usage.

[0052] According to some embodiments of the present invention, the first protective layer and / or the second protective layer are provided by printing or electroplating. For example, the provision of the first protective layer and the second protective layer includes the following situations: First, the first protective layer is provided by printing or electroplating. Second, the second protective layer is provided by printing or electroplating. Third, the first protective layer is provided by printing or electroplating. At the same time, the second protective layer is provided by printing or electroplating.

[0053] In this way, when the first protective layer and the second protective layer are set by printing, the printing setting process is simple and low in cost, and easy to operate, thereby improving the production efficiency of the first protective layer and the second protective layer, and reducing the production cost of the first protective layer and the second protective layer, thereby improving the production efficiency of the battery cell assembly 100 and reducing the production cost of the battery cell assembly 100. When the first protective layer and the second protective layer are set by electroplating, a dense first protective layer is formed on the outer peripheral surface of the first connecting component 42, and a dense second protective layer is formed on the outer peripheral surface of the second connecting component 52, which improves the adhesion of the first protective layer and the second protective layer, avoids the first protective layer and the second protective layer from falling off, thereby extending the service life of the first protective layer and the second protective layer. In addition, the corrosion resistance and wear resistance of the first protective layer and the second protective layer are also improved. In addition, electroplating also has the advantages of low cost, easy operation and high production efficiency. But not limited to this, for example, electroforming can also be used, which is a special electroplating, so that the precision of the first protective layer and the second protective layer is high, thereby improving the yield of the first protective layer and the second protective layer, and improving the precision of the production of the battery cell assembly 100.

[0054] According to some embodiments of the present invention, the first connecting section 411 and the first connecting component 42 are integrated into an integral structure through a bonding process; and / or the second connecting section 511 and the second connecting component 52 are integrated into an integral structure through a bonding process.

[0055] For example, the first electrical connection component 4 and the second electrical connection component 5 are arranged in the following cases: First, the first connection section 411 and the first connection component 42 are integrated into an integral structure by a bonding process. Second, the second connection section 511 and the second connection component 52 are integrated into an integral structure by a bonding process. Third, the first connection section 411 and the first connection component 42 are integrated into an integral structure by a bonding process, and the second connection section 511 and the second connection component 52 are integrated into an integral structure by a bonding process.

[0056] Thus, the end of the first connection segment 411 is prevented from falling off from the first connection component 42, and the end of the second connection segment 511 is prevented from falling off from the second connection component 52, thereby enhancing the use stability of the first electrical connection component 4 and the second electrical connection component 5, and improving the use stability of the battery cell assembly 100. In addition, the difficulty of forming the first electrical connection component 4 and the second electrical connection component 5 is reduced, and the production efficiency of the first electrical connection component 4 and the second electrical connection component 5 is improved.

[0057] According to some embodiments of the present invention, the bonding process includes ultrasonic bonding, thermocompression bonding or thermoacoustic bonding. As a result, the solder joints of ultrasonic bonding are small, and the required temperature is low, and basically no voids and cold solder joints occur, which improves the connection effect. Thermocompression bonding has high reliability in bonding strength, low requirements on the smoothness of the bonding surface, simple process and easy production. Thermoacoustic bonding can bond devices that cannot withstand high temperatures, and bonding can be achieved at low temperatures and low pressures, which is easy to control. Among them, the first electrical connection component 4 and the second electrical connection component 5 are applicable to the entire cell 1 or half of the cell 1. The cell assembly 100 can be a back-contact cell assembly 100, and the back-contact cell assembly 100 has a small warpage, which can avoid cracks during the lamination process of the cell assembly 100, and can use thinner silicon wafers, which also improves the reliability of the use of photovoltaic modules.

[0058] According to some embodiments of the present invention, connecting the first connecting segment 411 between two adjacent first connecting components 42 along the Y direction, and connecting the second connecting segment 511 between two adjacent second connecting components 52 along the Y direction (i.e., step S13 or step S12′) specifically includes: A wire welding machine (not shown) is used to connect the two ends of the first connecting section 411 to the corresponding first connecting component 42 , and a wire welding machine is used to connect the two ends of the second connecting section 511 to the corresponding second connecting component 52 .

[0059] For example, the detailed steps of step S13 or step S12′ are as follows: When the first connecting segment 411 is connected to two adjacent first connecting parts 42, first, the first connecting wire 41 is fed into the channel of the wedge tool of the welding machine. Then, the wedge tool of the welding machine is moved in the direction close to the battery cell 1, so that one end of the first connecting wire 41 contacts the rear surface of the first first connecting part 42, and the wedge tool applies pressure and starts ultrasonic or thermal ultrasonic waves to bond one end of the first connecting wire 41 to the first first connecting part 42 to achieve electrical connection. Subsequently, the wedge tool is moved in the direction away from the battery cell 1, and the first connecting wire 41 is continued to be led out. The wedge tool moves downward (the first connecting wire segment 411 forms a crescent shape) or moves upward and then downward (the first connecting wire segment 411 forms a fishtail shape) to form the first connecting wire 41 into the required ring shape. Next, when the wedge tool moves to a position opposite to the second first connecting part 42 along the thickness direction of the battery cell 1, the wedge tool is moved in the direction close to the second first connecting part 42, and pressure is applied to the first connecting wire 41, and the second bonding is completed on the rear surface of the second first connecting part 42.

[0060] After the second bonding, the wedge-shaped tool disconnects the first connection line 41 to form the first first connection segment 411. After the end of the disconnected first connection line 41 moves downward for a distance, the end of the first connection line 41 is bonded to the rear side of the second first connection component 42, the wedge-shaped tool moves downward to lead out the first connection line 41, the first connection line 41 is bonded to the third first connection component 42, and the first connection line 41 is disconnected after bonding to form the second first connection segment 411, and this is repeated in sequence.

[0061] When the second connecting segment 511 is connected to two adjacent second connecting components 52, first, the second connecting wire 51 is fed into the channel of the wedge-shaped tool of the welding machine. Then, the wedge-shaped tool of the welding machine is moved in the direction close to the battery cell 1, so that one end of the second connecting wire 51 contacts the rear surface of the first second connecting component 52, and the wedge-shaped tool applies pressure and starts ultrasonic or thermal ultrasonic waves to bond one end of the second connecting wire 51 to the first second connecting component 52 to achieve electrical connection. Subsequently, the wedge-shaped tool is moved in the direction away from the battery cell 1, and the second connecting wire 51 is continued to be led out. The wedge-shaped tool moves downward (such as the first connecting wire segment 411 forms a crescent shape) or moves upward and then downward (such as the first connecting wire segment 411 forms a fishtail shape), so that the second connecting wire 51 forms the required ring shape. Next, when the wedge-shaped tool moves to a position opposite to the second second connecting component 52 along the thickness direction of the battery cell 1 , the wedge-shaped tool is moved toward the second second connecting component 52 to apply pressure to the second connecting wire 51 to complete the second bonding on the rear surface of the second second connecting component 52 .

[0062] After the second bonding, the wedge-shaped tool disconnects the second connection line 51 to form the first second connection segment 511. After the end of the disconnected second connection line 51 moves downward for a distance, the end of the second connection line 51 is bonded to the rear side of the second second connection component 52, the wedge-shaped tool moves downward to lead out the second connection line 51, the second connection line 51 is bonded to the third second connection component 52, and the second connection line 51 is disconnected after bonding to form the second second connection segment 511, and this is repeated in sequence.

[0063] It should be noted that the first connecting wire 41 or the second connecting wire 51 can be disconnected by the method of clamp tearing or table tearing. Therefore, by adopting the above method, the end of the first connecting wire 41 and the surface of the first connecting part 42 are plastically deformed to form a strong connection, thereby improving the connection strength between the first connecting wire 41 and the first connecting part 42. The end of the second connecting wire 51 and the surface of the second connecting part 52 are plastically deformed to form a strong connection, thereby improving the connection strength between the second connecting wire 51 and the second connecting part 52. In addition, the axis of the channel of the wedge-shaped tool is aligned with the center line of the first bonding to ensure the smooth lead-out of the first connecting wire 41 or the second connecting wire 51.

[0064] According to some embodiments of the present invention, the first connecting wire 41 and / or the second connecting wire 52 includes a pure metal material, a metal-doped precious metal material, or a metal-doped rare earth metal material.

[0065] Thus, when the first connection line 41 and / or the second connection line 2 include pure metal materials, the pure metal materials may be Au, Al, Cu, Ag or Ni. Au, Al, Cu, Ag or Ni has good electrical conductivity, bonding, tendency to form intermetallic compounds (IMC) and Kirkendall effect, corrosion resistance, hardness, thermal expansion coefficient and other properties, which helps to improve the bonding performance between the first connection section 411 and the first connection component 42, and also improves the bonding performance between the second connection section 511 and the second connection component 52, thereby improving the connection accuracy between the first connection section 411 and the first connection component 42, and improving the connection accuracy between the second connection section 511 and the second connection component 52. Among them, the high-precision connection is due to the plastic deformation of the first connection section 411 and the mechanical interlocking between the first connection component 42, the plastic deformation of the second connection section 511 and the mechanical interlocking between the second connection component 52, and rarely forms intermetallic compounds. For example, the first connecting segment 411 and the second connecting segment 511 are copper pieces, respectively, the first connecting component 42 and the second connecting component 52 are silver pieces, respectively, and the third grid line 6 and the fourth grid line are silver pieces.

[0066] In addition, when the first connecting wire 411 and / or the second connecting wire 511 include metal-doped precious metal materials or metal-doped rare earth metal materials, the corrosion resistance and mechanical strength of the first connecting wire 411 and the second connecting wire 511 are improved, and the first connecting wire 411 and the second connecting wire 511 are prevented from being broken or damaged, thereby extending the service life of the first electrical connection component 4 and the second electrical connection component 5. It should be noted that the second connecting component 42 and / or the second connecting component 52 also include pure metal materials, metal-doped precious metal materials or metal-doped rare earth metal materials.

[0067] According to some embodiments of the present invention, the outer circumference of the first connecting wire 41 is provided with a third protective layer (not shown); and / or, the outer circumference of the second connecting wire 52 is provided with a fourth protective layer (not shown). For example, the configuration of the first electrical connection component 4 and the second electrical connection component 5 includes the following situations: First, the outer circumference of the first connecting wire 41 is provided with a third protective layer. Second, the outer circumference of the second connecting wire 51 is provided with a fourth protective layer. Third, the outer circumference of the first connecting wire 41 is provided with a third protective layer. At the same time, the outer circumference of the second connecting wire 51 is provided with a fourth protective layer.

[0068] With such a configuration, when the bonding ability between the first connecting section 411 and the first connecting component 42 is poor, a third protective layer can be provided on the outer peripheral surface of the first connecting line 41 to strengthen the bonding ability between the first connecting section 411 and the first connecting component 42, making it easier to bond or achieving a better bonding effect. In addition, when the bonding ability between the second connecting line and the second connecting component 52 is poor, a fourth protective layer can be provided on the outer peripheral surface of the second connecting section 511 to strengthen the bonding ability between the second connecting section 511 and the second connecting component 52, making it easier to bond or achieving a better bonding effect. In addition, the third protective layer on the outer peripheral surface of the first connecting line 41 can protect the first connecting line 41, and the fourth protective layer on the outer peripheral surface of the second connecting line 51 can protect the first connecting line 41, thereby avoiding corrosion and extending the service life.

[0069] According to some embodiments of the present invention, the third protective layer and / or the fourth protective layer are made of tin, lead or bismuth. For example, the third protective layer and the fourth protective layer are provided in the following cases: First, the third protective layer is made of tin, lead or bismuth. Second, the fourth protective layer is made of tin, lead or bismuth. Third, the third protective layer is made of tin, lead or bismuth. At the same time, the fourth protective layer is made of tin, lead or bismuth. As a result, tin, lead or bismuth respectively have good corrosion resistance, thereby improving the corrosion resistance of the third protective layer and the fourth protective layer, and further improving the physical or chemical properties such as strength and corrosion resistance of the first electrical connection component 4 and the second electrical connection component 5.

[0070] According to some embodiments of the present invention, the maximum width of the first connecting segment 411 is d1, wherein d1 satisfies: 0.01 mm ≤ d1 ≤ 0.2 mm. For example, when the maximum width of the first connecting segment 411 is greater than 0.2 mm, the width of the first connecting segment 411 is relatively large, which increases the material usage of the first connecting segment 411, increases the production cost of the first connecting segment 411, and thus increases the production cost of the cell assembly 100. When the maximum width of the first connecting segment 411 is less than 0.01 mm, the width of the first connecting segment 411 is relatively small, which increases the resistance of the first connecting segment 411, reduces the conductivity of the first connecting segment 411, and thus reduces the photoelectric conversion capacity of the cell assembly 100.

[0071] Therefore, by setting the maximum width d1 of the first connecting segment 411 to satisfy: 0.01mm≤d1≤0.2mm, the maximum width of the first connecting segment 411 is reasonably set, the material usage of the first connecting segment 411 is reduced, the production cost of the first connecting segment 411 is reduced, and thus the production cost of the cell assembly 100 is reduced. In addition, the resistance of the first connecting segment 411 is reduced, and the conductivity of the first connecting segment 411 is improved, thereby improving the photoelectric conversion capacity of the cell assembly 100, and further improving the performance of the cell assembly 100.

[0072] According to other embodiments of the present invention, the maximum width of the second connecting segment 511 is d2, wherein d2 satisfies: 0.01 mm ≤ d2 ≤ 0.2 mm. For example, when the maximum width of the second connecting segment 511 is greater than 0.2 mm, the width of the second connecting segment 511 is relatively large, which increases the material usage of the second connecting segment 511, increases the production cost of the second connecting segment 511, and thus increases the production cost of the cell assembly 100. When the maximum width of the second connecting segment 511 is less than 0.01 mm, the width of the second connecting segment 511 is relatively small, which increases the resistance of the second connecting segment 511, reduces the conductivity of the second connecting segment 511, and thus reduces the photoelectric conversion capacity of the cell assembly 100.

[0073] Therefore, by setting the maximum width d2 of the second connecting segment 511 to satisfy: 0.01mm≤d2≤0.2mm, the maximum width of the second connecting segment 511 is reasonably set, the material usage of the second connecting segment 511 is reduced, the production cost of the second connecting segment 511 is reduced, and thus the production cost of the cell assembly 100 is reduced. In addition, the resistance of the second connecting segment 511 is reduced, and the conductivity of the second connecting segment 511 is improved, thereby improving the photoelectric conversion capacity of the cell assembly 100, and further improving the performance of the cell assembly 100.

[0074] According to some further embodiments of the present invention, the maximum width of the first connecting segment 411 is d1, and the maximum width of the second connecting segment 511 is d2, wherein d1 and d2 respectively satisfy: 0.01mm≤d1≤0.2mm, 0.01mm≤d2≤0.2mm. Thus, the maximum width of the first connecting segment 411 and the maximum width of the second connecting segment 511 are reasonably set, which reduces the material usage of the first connecting segment 411 and the second connecting segment 511, reduces the production cost of the first connecting segment 411 and the second connecting segment 511, and thus reduces the production cost of the cell assembly 100. In addition, the resistance of the first connecting segment 411 and the resistance of the second connecting segment 511 are reduced, and the conductivity of the first connecting segment 411 and the second connecting segment 511 is improved, thereby improving the photoelectric conversion capacity of the cell assembly 100, and further improving the performance of the cell assembly 100.

[0075] Further, the cross-sectional shape of the first connecting segment 411 includes a circle, an ellipse, a polygon or a wedge; and / or, the cross-sectional shape of the second connecting segment 511 includes a circle, an ellipse, a polygon or a wedge. For example, the configuration of the first connecting segment 411 and the second connecting segment 511 includes the following situations: the cross-sectional shape of the first connecting segment 411 includes a circle, an ellipse, a polygon or a wedge. Second, the cross-sectional shape of the second connecting segment 511 includes a circle, an ellipse, a polygon or a wedge. Third, the cross-sectional shape of the first connecting segment 411 includes a circle, an ellipse, a polygon or a wedge. At the same time, the cross-sectional shape of the second connecting segment 511 includes a circle, an ellipse, a polygon or a wedge.

[0076] Thus, when the cross-sectional shape of the first connecting segment 411 and the cross-sectional shape of the second connecting segment 511 are respectively circular or elliptical, the structures of the first connecting segment 411 and the second connecting segment 511 are simple, easy to form and process, thereby improving the production efficiency of the first connecting segment 411 and the second connecting segment 511. When the cross-sectional shape of the first connecting segment 411 and the cross-sectional shape of the second connecting segment 511 are respectively polygonal or wedge-shaped, during the electrical connection (e.g., bonding) of the first connecting segment 411 and the first connecting component 42, the contact area between the end of the first connecting segment 411 and the first connecting component 42 is increased, which is convenient for connection. During the electrical connection (e.g., bonding) of the second connecting segment 511 and the second connecting component 52, the contact area between the end of the second connecting segment 511 and the second connecting component 52 is increased, which is convenient for connection. It should be noted that when the cross-sectional shape of the first connecting segment 411 is circular, the maximum width of the first connecting segment 411 is the diameter of the first connecting segment 411. When the cross-sectional shape of the second connecting segment 511 is circular, the maximum width of the second connecting segment 511 is the diameter of the second connecting segment 511. When the cross-sectional shapes of the first connecting segment 411 and the second connecting segment 511 are polygonal respectively, they may be any shapes such as rectangle, triangle, rhombus or trapezoid.

[0077] According to some embodiments of the present invention, the parameter Figure 3 and Figure 4 , the angle between one end of the first connecting segment 411 and one side surface of the battery cell 1 is an acute angle, the angle between the other end of the first connecting segment 411 and one side surface of the battery cell 1 is an acute angle, or the angle between the other end of the first connecting segment 411 and one side surface of the battery cell 1 is an obtuse angle.

[0078] For example, the angle between the lower end of the first connecting segment 411 and one side surface of the battery cell 1 is an obtuse angle, and the angle between the upper end of the first connecting segment 411 and one side surface of the battery cell 1 is an acute angle. Figure 3 In the example of , the angle between the lower end of the first connecting segment 411 and the side surface of the battery cell 1 is an acute angle, and the angle between the upper end of the first connecting segment 411 and the side surface of the battery cell 1 is an obtuse angle (for example, the first connecting segment 411 is in a fishtail shape). Or, Figure 4 In the example, the angle between the lower end of the first connecting segment 411 and the side surface of the battery cell 1 is an acute angle, and the angle between the upper end of the first connecting segment 411 and the side surface of the battery cell 1 is an acute angle (for example, the first connecting segment 411 is a crescent shape).

[0079] Such arrangement effectively ensures that there is a gap between the first connecting segment 411 and the battery cell 1, that is, effectively ensures that there is a gap between the first connecting segment 411 and the first grid line 2 in the front-to-back direction, thereby effectively avoiding a short circuit in the battery cell assembly 100. In addition, the flexibility of the arrangement of the first connecting segment 411 is improved, which is convenient for flexible arrangement according to actual use conditions, and improves the applicability of the battery cell assembly 100.

[0080] According to other embodiments of the present invention, the angle between one end of the second connecting segment 511 and one side surface of the battery cell 1 is an acute angle, the angle between the other end of the second connecting segment 511 and one side surface of the battery cell 1 is an acute angle, or the angle between the other end of the second connecting segment 511 and one side surface of the battery cell 1 is an obtuse angle.

[0081] For example, the angle between the lower end of the second connecting segment 511 and one side surface of the battery cell 1 is an obtuse angle, and the angle between the upper end of the second connecting segment 511 and one side surface of the battery cell 1 is an acute angle. Or, the angle between the lower end of the second connecting segment 511 and one side surface of the battery cell 1 is an acute angle, and the angle between the upper end of the second connecting segment 511 and one side surface of the battery cell 1 is an obtuse angle. Or, the angle between the lower end of the second connecting segment 511 and one side surface of the battery cell 1 is an acute angle, and the angle between the upper end of the second connecting segment 511 and one side surface of the battery cell 1 is an acute angle.

[0082] Such arrangement effectively ensures that there is a gap between the second connecting segment 511 and the battery cell 1, that is, effectively ensures that there is a gap between the second connecting segment 511 and the second grid line 3 in the front-to-back direction, thereby effectively avoiding a short circuit in the battery cell assembly 100. In addition, the flexibility of the arrangement of the second connecting segment 511 is improved, which is convenient for flexible arrangement according to actual use conditions, thereby improving the applicability of the battery cell assembly 100.

[0083] According to some further embodiments of the present invention, the angle between one end of the first connecting segment 411 and one side surface of the battery cell 1 is an acute angle, the angle between the other end of the first connecting segment 411 and one side surface of the battery cell 1 is an acute angle, or the angle between the other end of the first connecting segment 411 and one side surface of the battery cell 1 is an obtuse angle. At the same time, the angle between one end of the second connecting segment 511 and one side surface of the battery cell 1 is an acute angle, the angle between the other end of the second connecting segment 511 and one side surface of the battery cell 1 is an acute angle, or the angle between the other end of the second connecting segment 511 and one side surface of the battery cell 1 is an obtuse angle. Thus, it is effectively ensured that there is a gap between the first connecting segment 411 and the battery cell 1, that is, it is effectively ensured that there is a gap between the first connecting segment 411 and the first grid line 2 along the front-to-back direction, and it is effectively ensured that there is a gap between the second connecting segment 511 and the battery cell 1, that is, it is effectively ensured that there is a gap between the second connecting segment 511 and the second grid line 3 along the front-to-back direction, thereby effectively avoiding a short circuit in the battery cell assembly 100. In addition, the flexibility of setting the first connecting section 411 and the second connecting section 511 is improved, which facilitates flexible setting according to actual use conditions, thereby improving the applicability of the battery cell assembly 100.

[0084] It should be noted that when the angle between one end of the first connecting segment 411 and one side surface of the battery cell 1 is an acute angle, the angle between the other end of the first connecting segment 411 and one side surface of the battery cell 1 is an acute angle, the angle between one end of the second connecting segment 511 and one side surface of the battery cell 1 is an acute angle, and the angle between the other end of the second connecting segment 511 and one side surface of the battery cell 1 is an acute angle, during the manufacturing process, the required orthographic projection area of ​​the first connecting component 42 and the orthographic projection area of ​​the second connecting component 52 are smaller, and no protective gas is required at room temperature.

[0085] When the angle between one end of the first connecting segment 411 and one side surface of the battery cell 1 is acute, the angle between the other end of the first connecting segment 411 and one side surface of the battery cell 1 is obtuse, the angle between one end of the second connecting segment 511 and one side surface of the battery cell 1 is acute, and the angle between the other end of the second connecting segment 511 and one side surface of the battery cell 1 is obtuse, during the manufacturing process, the required orthographic projection area of ​​the first connecting component 42 and the orthographic projection area of ​​the second connecting component 52 are large, and high temperature and protective gas are required, but the operation is simple. Different shapes are formed according to the different materials of the first connecting wire 41 and the second connecting wire 51.

[0086] According to some embodiments of the present invention, referring to Figure 3 and Figure 4, the maximum distance between the first connecting section 411 and the above-mentioned one side surface of the battery cell 1 is h1, wherein h1 satisfies: 0.02mm≤h1≤5mm. For example, when the maximum distance between the first connecting section 411 and the rear side surface of the battery cell 1 is greater than 5mm, the maximum distance between the first connecting section 411 and the rear side surface of the battery cell 1 is large. During the manufacturing process of the battery cell assembly 100, after the battery cell assembly 100 is laminated, the first connecting section 411 is squeezed and easily deviates and contacts the first grid line segment 21 to cause a short circuit, thereby affecting the normal use of the battery cell assembly 100. When the maximum distance between the first connecting section 411 and the rear side surface of the battery cell 1 is less than 0.02mm, the distance between the first connecting section 411 and the rear side surface of the battery cell 1 is small, and the first connecting section 411 is easy to contact the rear side surface of the battery cell 1, reducing the anti-short circuit performance of the battery cell assembly 100.

[0087] Thus, by setting the maximum distance h1 between the first connecting section 411 and the above-mentioned one side surface of the battery cell 1 to satisfy: 0.02mm≤h1≤5mm, the distance between the first connecting section 411 and the battery cell 1 is set reasonably, so that in the process of manufacturing the battery cell assembly 100, after the battery cell assembly 100 is laminated, the first connecting section 411 is prevented from being offset and contacting the first grid line segment 21 after being squeezed, thereby preventing the battery cell assembly 100 from short circuiting and extending the service life of the battery cell assembly 100. In addition, the first connecting section 411 is prevented from contacting the rear side of the battery cell 1, thereby improving the anti-short circuit performance of the battery cell assembly 100. Among them, the maximum distances between the multiple first connecting sections 411 and the battery cell 1 can be equal or unequal. For example, in the process of producing the battery cell assembly 100, due to the error caused by the processing accuracy, the maximum distances between the multiple first connecting sections 411 and the battery cell 1 can be non-equidistant, that is, the height of the highest point of each first connecting section 411 along the front-to-back direction can be different.

[0088] According to some other embodiments of the present invention, the maximum distance between the second connecting section 511 and the above-mentioned one side surface of the battery cell 1 is h2, wherein h2 satisfies: 0.02mm≤h2≤5mm. For example, when the maximum distance between the second connecting section 511 and the rear side surface of the battery cell 1 is greater than 5mm, the maximum distance between the second connecting section 511 and the rear side surface of the battery cell 1 is large. During the manufacturing process of the battery cell assembly 100, after the battery cell assembly 100 is laminated, the second connecting section 511 is squeezed and easily deviates and contacts the second grid line segment 31, resulting in a short circuit, thereby affecting the normal use of the battery cell assembly 100. When the maximum distance between the second connecting section 511 and the rear side surface of the battery cell 1 is less than 0.02mm, the distance between the second connecting section 511 and the rear side surface of the battery cell 1 is small, and the second connecting section 511 is easy to contact the rear side surface of the battery cell 1, reducing the anti-short circuit performance of the battery cell assembly 100.

[0089] Thus, by setting the maximum distance h2 between the second connecting section 511 and the above-mentioned one side surface of the battery cell 1 to satisfy: 0.02mm≤h2≤5mm, the distance between the second connecting section 511 and the battery cell 1 is set reasonably, so that in the process of manufacturing the battery cell assembly 100, after the battery cell assembly 100 is laminated, the second connecting section 511 is prevented from being offset and contacting the second grid line segment 31 after being squeezed, thereby preventing the battery cell assembly 100 from short-circuiting and extending the service life of the battery cell assembly 100. In addition, the second connecting section 511 is prevented from contacting the rear side of the battery cell 1, thereby improving the anti-short circuit performance of the battery cell assembly 100. Among them, the maximum distances between the multiple second connecting sections 511 and the battery cell 1 can be equal or unequal. For example, in the process of producing the battery cell assembly 100, due to errors caused by the processing technology or processing accuracy, the maximum distances between the multiple second connecting sections 511 and the battery cell 1 can be non-equidistant, that is, the height of the highest point of each second connecting section 511 along the front-to-back direction can be different.

[0090] According to some further embodiments of the present invention, the maximum distance between the first connecting section 411 and the side surface of the battery cell 1 is h1, and the maximum distance between the second connecting section 511 and the side surface of the battery cell 1 is h2, wherein h1 and h2 respectively satisfy: 0.02mm≤h1≤5mm, 0.02mm≤h2≤5mm. Thus, the distances between the first connecting section 411 and the second connecting line 5 and the rear side surface of the battery cell 1 are reasonably set, which avoids the first connecting section 411 and the second connecting section 511 from being offset and short-circuited during the lamination process, thereby extending the service life of the battery cell assembly 100. In addition, it also avoids the first connecting section 411 and the second connecting section 511 from contacting the rear side surface of the battery cell 1, thereby improving the anti-short-circuit performance of the battery cell assembly 100.

[0091] Further, refer to Figure 3 and Figure 4 , h1 further satisfies: 0.05mm≤h1≤0.3mm; and / or, h2 further satisfies: 0.05mm≤h2≤0.3mm. For example, the settings of h1 and h2 include the following situations: First, h1 further satisfies: 0.05mm≤h1≤0.3mm. Second, h2 further satisfies: 0.05mm≤h2≤0.3mm. Third, h1 and h2 further satisfy: 0.05mm≤h1≤0.3mm, 0.05mm≤h2≤0.3mm, respectively.

[0092] When h1 is greater than 0.3 mm, the maximum distance between the first connecting segment 411 and the above-mentioned one side surface of the battery cell 1 is increased, thereby increasing the length of the first connecting segment 411, increasing the material usage of the first connecting segment 411, increasing the production cost of the first connecting segment 411, and increasing the production cost of the battery cell assembly 100. When h1 is less than 0.05 mm, the maximum distance between the first connecting segment 411 and the above-mentioned one side surface of the battery cell 1 is reduced. The distance is small, and it is difficult to control during the production process, which increases the difficulty of producing the first connecting segment 411, thereby increasing the difficulty of producing the battery cell assembly 100.

[0093] When h2 is greater than 0.3 mm, the maximum distance between the second connecting segment 511 and the above-mentioned one side surface of the battery cell 1 is increased, thereby increasing the length of the second connecting segment 511, increasing the material usage of the second connecting segment 511, increasing the production cost of the second connecting segment 511, and increasing the production cost of the battery cell assembly 100. When h2 is less than 0.05 mm, the maximum distance between the second connecting segment 511 and the above-mentioned one side surface of the battery cell 1 is reduced. The distance is small, and it is difficult to control during the production process, which increases the difficulty of producing the second connecting segment 511, thereby increasing the difficulty of producing the battery cell assembly 100.

[0094] Therefore, by setting h1 and h2 to further satisfy: 0.05mm≤h1≤0.3mm, 0.05mm≤h2≤0.3mm, under the condition of ensuring short circuit prevention, the maximum distance between the first connecting section 411 and the above-mentioned one side surface of the battery cell 1 and the maximum distance between the second connecting section 511 and the above-mentioned one side surface of the battery cell 1 are reasonably set, thereby shortening the length of the first connecting section 411 and the second connecting section 511, reducing the material consumption of the first connecting section 411 and the second connecting section 511, and reducing the production cost of the battery cell assembly 100. In addition, in the production process, it is easy to control the distance between the first connecting section 411 and the battery cell 1, and the distance between the second connecting section 511 and the battery cell 1, thereby reducing the production difficulty of the first connecting section 411 and the second connecting section 511, reducing the production difficulty of the battery cell assembly 100, and improving the production efficiency of the battery cell assembly 100.

[0095] According to some embodiments of the present invention, referring to Figure 5 and Figure 6, a first interconnection portion 43 is formed at the connection between the first connection segment 411 and the first connection component 42, the orthographic projection area of ​​the first interconnection portion 43 on the first connection component 42 is s1, the cross-sectional area of ​​the first connection segment 411 is s2, and the orthographic projection area of ​​the first connection component 42 on the battery cell 1 is s3, wherein s1, s2 and s3 satisfy: s2<s1≤s3. For example, during the bonding process of the first connection segment 411 and the first connection component 42, the end of the first connection segment 411 connected to the first connection component 42 melts, and the first interconnection portion 43 is formed after the melting and solidification. Thus, the connection area between the first connection segment 411 and the first connection component 42 is increased by the first interconnection portion 43, thereby strengthening the connection strength between the first connection segment 411 and the first connection component 42, preventing the first connection segment 411 from falling off the first connection component 42, and improving the use stability of the first electrical connection assembly 4. In addition, it is prevented that the first interconnection portion 43 overflows the first connection component 42, which reduces the aesthetics of the battery cell assembly 100. Moreover, it is also convenient for one end of the two first connecting segments 411 to form the first interconnecting parts 43 on the same first connecting component 42, thereby effectively ensuring that multiple first connecting segments 411 and multiple first connecting components 42 can be connected in sequence. It should be noted that the two different first interconnecting parts 43 on the same first connecting component 42 can overlap or not overlap, and can be specifically set according to actual use. The two ends of the first connecting segment 411 respectively form the first interconnecting parts 43 with the connection points of the two adjacent first connecting components 42, but it is not limited to this.

[0096] According to other embodiments of the present invention, a second interconnection portion (not shown) is formed at the connection between the second connection segment 511 and the second connection component 52, the orthographic projection area of ​​the second interconnection portion on the second connection component 52 is s4, the cross-sectional area of ​​the second connection segment 511 is s5, and the orthographic projection area of ​​the second connection component 52 on the battery cell 1 is s6, wherein s4, s5 and s6 satisfy: s5<s4≤s6. For example, during the bonding and welding process of the second connection segment 511 and the second connection component 52, the end portion of the second connection segment 511 connected to the second connection component 52 melts, and the second interconnection portion is formed after the melt solidifies.

[0097] Thus, the connection area between the second connection section 511 and the second connection component 52 is increased by the second interconnection part, thereby strengthening the connection strength between the second connection section 511 and the second connection component 52, preventing the second connection section 511 from falling off the second connection component 52, and improving the use stability of the second electrical connection assembly 5. In addition, the second interconnection part is prevented from overflowing the second connection component 52, which reduces the aesthetics of the battery cell assembly 100. Moreover, it is also convenient for one end of the two second connection sections 511 to form a second interconnection part on the same second connection component 52, thereby effectively ensuring that multiple second connection sections 511 and multiple second connection components 52 can be connected in sequence. It should be noted that the two different second interconnections on the same second connection component 52 may overlap or not overlap, and can be specifically set according to the actual use situation. The two ends of the second connection section 511 respectively form a second interconnection part with the connection of two adjacent second connection components 52, but it is not limited to this.

[0098] Further, the orthographic projection shape of the first interconnection part 43 on the first connecting part 42 is circular, oblong or polygonal. The orthographic projection shape of the second interconnection part on the second connecting part 52 is circular, oblong or polygonal. Thus, when the cross-sectional shape of the first interconnection part 43 and the cross-sectional shape of the second interconnection part are circular, the cross-sectional area shape of the first interconnection part 43 is adapted to the cross-sectional shape of the first connecting section 411 as circular or elliptical, and the cross-sectional area shape of the second interconnection part is adapted to the cross-sectional shape of the second connecting section 511 as circular or elliptical, which is easy to produce. When the cross-sectional shape of the first interconnection part 43 and the cross-sectional shape of the second interconnection part are oblong or polygonal, the cross-sectional area shape of the first interconnection part 43 is adapted to the cross-sectional shape of the first connecting section 411 as polygonal or wedge-shaped, and the cross-sectional area shape of the second interconnection part is adapted to the cross-sectional shape of the second connecting section 511 as polygonal or wedge-shaped, which is easy to produce. It should be noted that the shape of the first interconnection part 43 and the shape of the second interconnection part can be spherical or wedge-shaped, but are not limited thereto.

[0099] According to some embodiments of the present invention, referring to Figure 1 The first gate line 2 includes a plurality of first gate line segments 21 arranged at intervals along the X direction, the first connecting segment 411 is located between two adjacent first gate line segments 21 of the plurality of first gate lines 2, and the first connecting segment 411 is spaced apart from the ends of the two adjacent first gate line segments 21. The second gate line 3 includes a plurality of second gate line segments 31 arranged at intervals along the X direction, the second connecting segment 511 is located between two adjacent second gate line segments 31 of the plurality of second gate lines 3, and the second connecting segment 511 is spaced apart from the ends of the two adjacent second gate line segments 31.

[0100] For example, in Figure 1In the example, a plurality of first gate line segments 21 are arranged at intervals along the left-right direction, and a plurality of second gate line segments 31 are arranged at intervals along the left-right direction. A plurality of first connecting segments 411 are respectively spaced apart from the ends of the corresponding plurality of first gate line segments 21, that is, a plurality of first connecting segments 411 are respectively insulated from the corresponding plurality of first gate lines 2. A plurality of second connecting segments 511 are respectively spaced apart from the ends of the corresponding plurality of second gate line segments 31, that is, a plurality of second connecting segments 511 are respectively insulated from the corresponding plurality of second gate lines 3. Among them, the first connecting segment 411 of the first electrical connection component 4 is located between two adjacent first gate line segments 21 and is spaced apart from the two adjacent first gate line segments 21. The second connecting segment 511 of the second electrical connection component 5 is located between two adjacent second gate line segments 31 and is spaced apart from the two adjacent second gate line segments 31.

[0101] Such arrangement reduces the amount of material (e.g., silver paste) used for the first grid line 2 and the second grid line 3, thereby reducing the printing cost of the first grid line 2 and the second grid line 3, and further reducing the production cost of the cell assembly 100. In addition, the first grid line segment 21 and the second grid line segment 31 have a simple structure and are easy to produce, thereby improving the production cost of the cell assembly 100. In addition, by providing a plurality of first grid line segments 21 and second grid line segments 31, the free end of the first grid line segment 21 and the first connecting segment 411 can be separated, so that the first grid line segment 21 is further insulated from the first connecting segment 411. The free end of the second grid line segment 31 is separated from the second connecting segment 511, so that the second grid line segment 31 is further insulated from the second connecting segment 511, further avoiding the occurrence of a short circuit, and improving the reliability of the cell assembly 100. It should be noted that compared with the welding strip in the traditional technology, the width of the first connecting section 411 and the second connecting section 511 is smaller, thereby further increasing the distance between the first connecting section 411 and the first gate line 2, and further increasing the distance between the second connecting section 511 and the second gate line 3, thereby effectively avoiding the occurrence of short circuits and further improving the performance of the battery cell assembly 100.

[0102] Or, under the condition of ensuring that short circuit is avoided, the width of the first connecting segment 411 is small, which can reduce the distance between the ends of the two first grid line segments 21 adjacent to the first connecting segment 411, extend the length of the first grid line segment 21, and improve the current collection capability of the first grid line 2. The width of the second connecting segment 511 is small, which can reduce the distance between the ends of the two second grid line segments 31 adjacent to the second connecting segment 511, extend the length of the second grid line segment 31, and improve the current collection capability of the second grid line 3, thereby improving the photoelectric conversion capability of the cell assembly 100.

[0103] According to some embodiments of the present invention, referring to Figure 1A first disconnection opening 22 is defined between two adjacent first gate line segments 21, and a plurality of first disconnection openings 22 of a plurality of first gate lines 2 are disposed along the Y direction (ie Figure 1 The first connecting member 42 is disposed on the second grid line segment 31, and the first connecting member 42 is opposite to the first disconnection opening 22 along the Y direction. A second disconnection opening 32 is defined between two adjacent second grid line segments 31, and a plurality of second disconnection openings 32 of a plurality of second grid lines 3 are opposite to each other along the Y direction, and a plurality of first disconnection openings 22 and a plurality of second disconnection openings 32 are arranged alternately along the Y direction. The second connecting member 52 is disposed on the first grid line segment 21, and the second connecting member 52 is opposite to the second disconnection opening 32 along the Y direction.

[0104] For example, in Figure 1 In the example, the plurality of first openings 22 of each first gate line 2 are arranged along the X direction (ie Figure 1 The plurality of first disconnected openings 22 of the plurality of first grid lines 2 are arranged in a plurality of rows relatively to each other up and down, and the plurality of rows of the first disconnected openings 22 are arranged in a plurality of rows along the X direction. The plurality of second disconnected openings 32 of each second grid line 3 are arranged in a plurality of rows relatively to each other up and down, and the plurality of rows of the second disconnected openings 32 and the plurality of rows of the first disconnected openings 22 are arranged alternately along the X direction.

[0105] In the case where there is no main busbar on the cell assembly 100, the first connecting component 42 is arranged on the side of the second busbar 3 away from the cell 1, the first connecting component 42 is opposite to the first disconnection opening 22 in the vertical direction, and the first connecting segment 411 is opposite to the first disconnection opening 22 in the thickness direction (i.e., the front-back direction) of the cell assembly 100. The second connecting component 52 is arranged on the side of the first busbar 2 away from the cell 1, the second connecting component 52 is opposite to the second disconnection opening 32 in the vertical direction, and the second connecting segment 511 is opposite to the second disconnection opening 32 in the thickness direction of the cell assembly 100. Among them, the currents on the multiple first busbars 2 on the cell 1 are converged to the multiple second connecting segments 511 through the multiple second connecting components 52, and the currents on the multiple second busbars 3 are converged to the multiple first connecting segments 411 through the multiple first connecting components 42.

[0106] Therefore, by setting the first disconnection opening 22 and the second disconnection opening 32, the multiple first connection segments 411 are separated from the multiple first grid lines 2 by being opposite to the corresponding multiple first disconnection openings 22 along the thickness direction of the battery cell assembly 100, and the multiple second connection segments 511 are separated from the multiple second grid lines 3 by being opposite to the corresponding multiple second disconnection openings 32 along the thickness direction of the battery cell assembly 100. There is no need to adopt other structures to achieve insulation, which is beneficial to the connection between the battery cell assembly 100 and the first connection segments 411 and the second connection segments 511, and also simplifies the production process of the battery cell assembly 100, improves production efficiency and reduces costs.

[0107] According to some embodiments of the present invention, referring to Figure 1 , the distance between the first connecting segment 411 and the end of the adjacent first gate line segment 21 is L1, wherein L1 satisfies: 0.15mm≤L1≤1.6mm; and / or, the distance between the second connecting segment 511 and the end of the adjacent second gate line segment 31 is L2, wherein L2 satisfies: 0.15mm≤L2≤1.6mm.

[0108] In the case where there is no main grid line on the battery cell assembly 100, the settings of the first connecting segment 411 and the second connecting segment 511 include the following situations: First, the distance between the first connecting segment 411 and the end of the adjacent first grid line segment 21 is L1, where L1 satisfies: 0.15mm≤L1≤1.6mm. Second, the distance between the second connecting segment 511 and the end of the adjacent second grid line segment 31 is L2, where L2 satisfies: 0.15mm≤L2≤1.6mm. Third, the distance between the first connecting segment 411 and the end of the adjacent first grid line segment 21 is L1, and the distance between the second connecting segment 511 and the end of the adjacent second grid line segment 31 is L2, where L1 and L2 respectively satisfy: 0.15mm≤L1≤1.6mm, 0.15mm≤L2≤1.6mm.

[0109] When the distance between the first connecting segment 411 and the end of the adjacent first grid line segment 21 is less than 0.15 mm, the distance between the first connecting segment 411 and the end of the adjacent first grid line segment 21 is small, and the first connecting segment 411 is easy to contact with the first grid line segment 21, so that the battery cell assembly 100 is prone to short circuit, which is not conducive to the normal use of the battery cell assembly 100. In addition, it also increases the difficulty of assembling the first connecting segment 411 and the battery cell 1, and reduces the assembly efficiency of the battery cell assembly 100. When the distance between the first connecting segment 411 and the end of the adjacent first grid line segment 21 is greater than 1.6 mm, the distance between the first connecting segment 411 and the end of the adjacent first grid line segment 21 is large, shortening the length of the first grid line segment 21, that is, shortening the length of the first grid line 2, reducing the occupied area of ​​the first grid line 2 on the battery cell 1, thereby reducing the utilization of the surface of the battery cell 1, and then reducing the use efficiency of the battery cell assembly 100.

[0110] When the distance between the second connecting segment 511 and the end of the adjacent second grid line segment 31 is less than 0.15 mm, the distance between the second connecting segment 511 and the end of the adjacent second grid line segment 31 is small, and the second connecting segment 511 is easy to contact with the second grid line segment 31, so that the battery cell assembly 100 is prone to short circuit, which is not conducive to the normal use of the battery cell assembly 100. In addition, it also increases the difficulty of assembling the second connecting segment 511 and the battery cell 1, and reduces the assembly efficiency of the battery cell assembly 100. When the distance between the second connecting segment 511 and the end of the adjacent second grid line segment 31 is greater than 1.6 mm, the distance between the second connecting segment 511 and the end of the adjacent second grid line segment 31 is large, shortening the length of the second grid line segment 31, that is, shortening the length of the second grid line 3, reducing the area occupied by the second grid line 3 on the battery cell 1, thereby reducing the utilization of the surface of the battery cell 1, and then reducing the use efficiency of the battery cell assembly 100.

[0111] Thus, by setting the distance L1 between the first connecting segment 411 and the end of the adjacent first grid line segment 21, and the distance L2 between the second connecting segment 511 and the end of the adjacent second grid line segment 31 to respectively satisfy: 0.15mm≤L1≤1.6mm, 0.15mm≤L2≤1.6mm, the distance between the first connecting segment 411 and the end of the adjacent first grid line segment 21, and the distance between the second connecting segment 511 and the end of the adjacent second grid line segment 31 are reasonably set, thereby avoiding the first connecting segment 411 from contacting the first grid line segment 21, and also avoiding the second connecting segment 511 from contacting the second grid line segment 31, thereby avoiding the short circuit of the battery cell assembly 100, thereby extending the service life of the battery cell assembly 100. In addition, while reducing the material usage of the first grid line 2 and the second grid line 3, the occupied area of ​​the first grid line 2 and the second grid line 3 is guaranteed, which is more conducive to the use of the battery cell assembly 100. In addition, the difficulty of assembling the battery cell 1 and the first connecting section 411 and the second connecting section 511 is reduced, thereby improving the assembly efficiency of the battery cell assembly 100 .

[0112] According to some embodiments of the present invention, referring to Figure 1 , along the Y direction, both sides of the first connecting component 42 protrude from the two side edges of the second gate line 3 respectively; and / or, along the Y direction, both sides of the second connecting component 52 protrude from the two side edges of the first gate line 2 respectively.

[0113] For example, in Figure 1 In the example, the first connecting component 42 and the second connecting component 52 are arranged in the following cases: First, along the Y direction, the two sides of the first connecting component 42 protrude from the two side edges of the second grid line 3. Second, along the Y direction, the two sides of the second connecting component 52 protrude from the two side edges of the first grid line 2. Third, along the Y direction, the two sides of the first connecting component 42 protrude from the two side edges of the second grid line 3. At the same time, along the Y direction, the two sides of the second connecting component 52 protrude from the two side edges of the first grid line 2.

[0114] In the case where there is no main grid line on the cell assembly 100, the upper side of the first connecting component 42 protrudes from the upper side of the second grid line 3, and the lower side of the second connecting component 52 protrudes from the lower side of the second grid line 3, that is, the width of the first connecting component 42 is greater than the width of the second grid line 3. The upper side of the second connecting component 52 protrudes from the upper side of the first grid line 2, and the lower side of the second connecting component 52 protrudes from the lower side of the first grid line 2, that is, the width of the second connecting component 52 is greater than the width of the first grid line 2.

[0115] With such arrangement, the first connection member 42 and the second grid line 3 are in full contact along the up-down direction, which increases the contact area between the first connection member 42 and the second grid line 3, improves the current collection capacity of the first electrical connection component 4, and thus improves the photoelectric conversion capacity of the cell assembly 100. In addition, the second connection member 52 and the first grid line 2 are in full contact along the up-down direction, which increases the contact area between the second connection member 52 and the first grid line 2, improves the current collection capacity of the second electrical connection component 5, and thus improves the photoelectric conversion capacity of the cell assembly 100. It should be noted that, in the process of preparing the cell assembly 100, after arranging the plurality of first grid lines 2 and the plurality of second grid lines 3 on the cell 1, the plurality of first connection members 42 and the plurality of second connection members 52 are respectively printed on the rear side of the cell 1, and then the plurality of first connection segments 411 are respectively connected to the plurality of adjacent two first connection members 42, and the plurality of second connection segments 511 are respectively connected to the plurality of adjacent two second connection members 52.

[0116] According to some embodiments of the present invention, when the first gate line 2 and the first connecting component 42 are separately provided, and the second gate line 3 and the second connecting component 52 are separately provided, before providing the first connecting component 42 and the second connecting component 52, the method further includes: A plurality of third grid lines 6 and a plurality of fourth grid lines (not shown) are provided on the battery cell 1. The plurality of third grid lines 6 and the plurality of fourth grid lines are alternately arranged along the X direction. The third grid lines 6 are electrically connected to the plurality of second grid lines 3 respectively, and the fourth grid lines are electrically connected to the plurality of first grid lines 2 respectively.

[0117] The third gate line 6 is disposed between two adjacent first gate line segments 21 of the plurality of first gate lines 2, and the third gate line 6 is spaced apart from the ends of the two adjacent first gate line segments 21. The fourth gate line is disposed between two adjacent second gate line segments 31 of the plurality of second gate lines 3, and the fourth gate line is spaced apart from the ends of the two adjacent second gate line segments 31. A plurality of first connecting components 42 are spaced apart on a side of the third gate line 6 away from the battery cell 1, and a plurality of second connecting components 52 are spaced apart on a side of the fourth gate line away from the battery cell 1.

[0118] For example, a plurality of third grid lines 6 are separated from the free ends of the corresponding plurality of first grid line segments 21 to achieve insulation, and a plurality of third grid lines 6 are electrically connected to a plurality of second grid lines 3 (for example, they can be electrically connected by screen printing or welding). A plurality of fourth grid lines are separated from the free ends of the corresponding plurality of second grid line segments 31 to achieve insulation, and a plurality of fourth grid lines are electrically connected to a plurality of first grid lines 2 (for example, they can be electrically connected by screen printing or welding). It should be noted that the first connecting component 42 is electrically connected to the third grid line 6 by screen printing, welding or bonding. The second connecting component 52 is electrically connected to the fourth grid line by screen printing, welding or bonding. It should be noted that the third grid line 6 and the fourth grid line are respectively main grid lines, wherein the polarity of the third grid line 6 is the same as the polarity of the second grid line 3, and the polarity of the fourth grid line is the same as the polarity of the first grid line 2.

[0119] With such arrangement, the current on the cell assembly 100 can be collected through the third grid line 6, and then the current on the cell assembly 100 is collected through the first connecting component 42 and the first connecting segment 411. The current on the cell assembly 100 can be collected through the fourth grid line, and then the current on the cell assembly 100 is collected through the second connecting component 52 and the second connecting segment 511. Moreover, the current on the second grid line 3 can also be introduced to the first connecting component 42 through the third grid line 6, and the current on the first grid line 2 can also be introduced to the second connecting component 52 through the fourth grid line, thereby improving the current collection capability of the cell assembly 100, and avoiding short circuit of the cell assembly 100, so that the cell assembly 100 can be used normally for a long time. It should be noted that, during the preparation of the battery cell assembly 100, after a plurality of first grid lines 2, a plurality of second grid lines 3, a plurality of third grid lines 6 and a plurality of fourth grid lines are arranged on the battery cell 1, a plurality of first connecting components 42 and a plurality of second connecting components 52 are respectively printed on a side of the plurality of third grid lines 6 and the plurality of fourth grid lines away from the battery cell 1, and then a plurality of first connecting segments 411 are respectively connected to a plurality of adjacent two first connecting components 42 in turn, and a plurality of second connecting segments 511 are respectively connected to a plurality of adjacent two second connecting components 52 in turn.

[0120] Optionally, a portion of the plurality of third grid lines 6 and a portion of the plurality of fourth grid lines are respectively embedded in the rear side of the cell 1. This arrangement increases the contact area between the third grid lines 6 and the cell 1, and increases the contact area between the fourth grid lines and the cell 1, thereby improving the ability of the third grid lines 6 and the fourth grid lines to collect electrons, and further improving the photoelectric conversion ability of the cell assembly 100.

[0121] According to some embodiments of the present invention, referring to Figure 2A first disconnection opening 22 is defined between two adjacent first gate line segments 21, and multiple first disconnection openings 22 of multiple first gate lines 2 are respectively opposite to each other along the Y direction. The first connecting component 42 is located on the third gate line 6 at the first disconnection opening 22, or the first connecting component 42 is located at the connection between the third gate line 6 and the second gate line 3; and / or, the second connecting component 52 is located on the fourth gate line at the second disconnection opening 32, or the second connecting component 52 is located at the electrical connection between the fourth gate line and the first gate line 2.

[0122] For example, in Figure 2 In the example of , the arrangement of the first connecting component 42 and the second connecting component 52 includes the following situations: First, the first connecting component 42 is located on the third gate line 6 at the first disconnection port 22, or the first connecting component 42 is located at the connection between the third gate line 6 and the second gate line 3. Second, the second connecting component 52 is located on the fourth gate line at the second disconnection port 32, or the second connecting component 52 is located at the electrical connection between the fourth gate line and the first gate line 2. Third, the first connecting component 42 is located on the third gate line 6 at the first disconnection port 22, or the first connecting component 42 is located at the connection between the third gate line 6 and the second gate line 3. At the same time, the second connecting component 52 is located on the fourth gate line at the second disconnection port 32, or the second connecting component 52 is located at the electrical connection between the fourth gate line and the first gate line 2.

[0123] Thus, when the first connecting member 42 is located on the third grid line 6 at the first disconnection port 22, the first connecting member 42 is separated from the first grid line segment 21 to achieve insulation. When the first connecting member 42 is located at the connection between the third grid line 6 and the second grid line 3, it is easy to arrange the first connecting member 42, so that it is easy to process. Wherein, in both cases, the current can be introduced into the first connecting member 42 through the third grid line 6, so that the battery cell assembly 100 can be used normally for a long time. In addition, when the second connecting member 52 is located on the fourth grid line at the second disconnection port 32, the second connecting member 52 is separated from the second grid line segment 31 to achieve insulation. When the second connecting member 52 is located at the connection between the fourth grid line and the first grid line 2, it is easy to arrange the second connecting member 52, so that it is easy to process. Wherein, in both cases, the current can be introduced into the second connecting member 52 through the fourth grid line, so that the battery cell assembly 100 can be used normally for a long time.

[0124] In addition, when multiple first connecting components 42 are arranged on the same third grid line 6, they can be arranged at equal intervals or unequal intervals. When multiple second connecting components 52 are arranged on the same fourth grid line, they can be arranged at equal intervals or unequal intervals. The distance between two adjacent first connecting components 42 and the distance between two adjacent second connecting components 52 arranged in the up and down directions can be equal or unequal, that is, multiple first connecting components 42 and multiple second connecting components 52 in the left and right directions can be on the same horizontal line or on different horizontal lines, so that the number and arrangement of multiple first connecting components 42 and multiple second connecting components 52 can be specific to actual usage, thereby improving the flexibility of the arrangement of multiple first connecting components 42 and multiple second connecting components 52 and improving the adaptability of the battery cell assembly 100.

[0125] Optionally, when both ends of the first connecting segment 411 are respectively connected to two adjacent first connecting components 42, the connection between the upper end of the first connecting segment 411 (i.e., the head of the first connecting segment 411) and the corresponding first connecting component 42 forms a first interconnecting portion 43, and the connection between the lower end of the first connecting segment 411 (i.e., the tail of the first connecting segment 411) and the corresponding first connecting component 42 forms a first interconnecting member 44 (i.e., Figure 6 As shown). When the two ends of the second connecting section 511 are connected to the two adjacent second connecting parts 52, the above-mentioned upper end of the second connecting section 511 (i.e., the head of the second connecting section 511) and the connection of the corresponding second connecting part 52 form a second interconnecting part, and the above-mentioned lower end of the second connecting section 511 (i.e., the tail of the second connecting section 511) and the connection of the corresponding second connecting part 52 form a second interconnecting member (not shown in the figure). The first interconnecting member 44 and the second interconnecting member can be point structures respectively. As a result, the structure of the first interconnecting member 44 and the second interconnecting member is simple and easy to form, which improves the production efficiency of the first electrical connection assembly 4 and the second electrical connection assembly 5, and improves the production efficiency of the battery cell assembly 100. It should be noted that the first interconnecting portion 43 and the first interconnecting member 44 on the same first connecting part 42 are spaced apart along the Y direction, and the second interconnecting portion and the second interconnecting member on the same second connecting part 52 are spaced apart along the Y direction, but it is not limited to this.

[0126] Among them, Figure 6 As shown, when the first interconnecting portion 43 and the second interconnecting portion are spherical, the maximum width of the first connecting segment 41 is d1, the maximum width of the second connecting segment 51 is d2, the diameter of the first interconnecting portion 43 is d3, and the diameter of the second interconnecting portion is d4, wherein d1, d2, d3 and d4 respectively satisfy: 2.5≤d3 / d1≤5, 2.5≤d4 / d2≤5.

[0127] For example, when d3 / d1 is less than 2.5, the diameter of the first interconnection 43 is small, which reduces the contact area between the first interconnection 43 and the first connection component 42, thereby reducing the connection stability between the first interconnection 43 and the first connection component 42. When d3 / d1 is greater than 5, the diameter of the first interconnection 43 is large, which increases the material usage of the first interconnection 43 and increases the production cost of the first electrical connection assembly 4.

[0128] When d4 / d2 is less than 2.5, the diameter of the second interconnection is small, which reduces the contact area between the second interconnection and the second connection component 52, thereby reducing the connection stability between the second interconnection and the second connection component 52. When d4 / d2 is greater than 5, the diameter of the second interconnection is large, which increases the material usage of the second interconnection and increases the production cost of the second electrical connection assembly 5.

[0129] Therefore, by setting d1, d2, d3 and d4 to respectively satisfy: 2.5≤d3 / d1≤5, 2.5≤d4 / d2≤5, the ratio of the diameter d3 of the first interconnecting portion 43 to the maximum width d1 of the first connecting segment 41 is reasonably set, and the ratio of the diameter d4 of the second interconnecting portion to the maximum width d2 of the second connecting segment 51 is reasonably set. The diameter of the first interconnecting portion 43 and the diameter of the second interconnecting portion are relatively large, which increases the contact area between the first interconnecting portion 43 and the first connecting component 42, improves the connection stability between the first interconnecting portion 43 and the first connecting component 42, that is, improves the connection stability between the first connecting segment 411 and the first connecting component 42, and also increases the contact area between the second interconnecting portion and the second connecting component 52, improves the connection stability between the second interconnecting portion and the second connecting component 52, that is, improves the connection stability between the second connecting segment 511 and the second connecting component 52, thereby improving the use stability of the first electrical connection assembly 4 and the second electrical connection assembly 5, which is beneficial to the long-term normal use of the battery cell assembly 100. In addition, the material usage of the first interconnection part 43 and the second interconnection part is reduced, thereby reducing the material usage of the first electrical connection component 4 and the second electrical connection component 5, reducing the production cost of the first electrical connection component 4 and the second electrical connection component 5, and further reducing the production cost of the battery cell assembly 100. Figure 5 As shown, when the first interconnection portion 43 and the second interconnection portion are wedge-shaped respectively, the maximum width of the first connecting segment 41 is d1, the maximum width of the second connecting segment 51 is d2, the width of the first interconnection portion 43 along the X direction is d5, and the width of the second interconnection portion along the X direction is d6, wherein d1, d2, d5 and d6 respectively satisfy: 2μm≤d5-d1≤10μm, 2μm≤d6-d2≤10μm.

[0130] In this way, the difference between the width d5 ​​of the first interconnection part 43 and the maximum width d1 of the first connection section 41 is reasonably set, and the difference between the width d6 of the second interconnection part and the maximum width d2 of the second connection section 51 is reasonably set, so that the width of the first interconnection part 43 and the width of the second interconnection part are larger, the contact area between the first interconnection part 43 and the first connection part 42 is increased, and the connection stability between the first interconnection part 43 and the first connection part 42 is improved, that is, the connection stability between the first connection section 411 and the first connection part 42 is improved, and the contact area between the second interconnection part and the second connection part 52 is increased, and the connection stability between the second interconnection part and the second connection part 52 is improved, that is, the connection stability between the second connection section 511 and the second connection part 52 is improved, so as to facilitate the long-term normal use of the battery cell assembly 100. In addition, the material consumption of the first interconnection part 43 and the second interconnection part is reduced, thereby reducing the material consumption of the first electrical connection assembly 4 and the second electrical connection assembly 5, reducing the production cost of the first electrical connection assembly 4 and the second electrical connection assembly 5, and further reducing the production cost of the battery cell assembly 100. It should be noted that the length of the first connecting component 42 is greater than the length of the first interconnecting portion 43, wherein the length of the first interconnecting portion 43 and the length of the first connecting component 42 refer to the length along the Y direction, that is, the direction in which the first electrical connection component 4 extends. The length of the second connecting component 52 is greater than the length of the second interconnecting portion, wherein the length of the second interconnecting portion and the length of the second connecting component 52 refer to the length along the Y direction, that is, the direction in which the second electrical connection component 5 extends.

[0131] According to some optional embodiments of the present invention, referring to Figure 3 and Figure 4 The cell 1 includes a first layer 11, a second layer 12, a third layer 13, a fourth layer 14, a fifth layer 15 and a sixth layer 16 which are arranged in sequence along the thickness direction of the cell assembly 100. The first layer 11 is located on the front side of the cell 1 (i.e., the light-receiving side of the cell 1), and the sixth layer 16 is located on the rear side of the battery body (i.e., the backlight side of the cell 1). The first grid line 2, the second grid line 3, the third grid line 6, the fourth grid line, the first connecting component 42 and the second connecting component 52 are all arranged on the side of the sixth layer 16 away from the fifth layer 15. The first layer 11 is SiN x The second layer 12 is SiO2, the third layer 13 is n+FSF, the fourth layer 14 is n-type Si, the fifth layer 15 is the Poly region and the Gap region, and the sixth layer 16 is SiN x Among them, the sixth layer 16 is an insulating layer, the third layer 13 is a positive surface field, and the second layer 12 and the first layer 11 are passivation regions. With such a configuration, the cell 1 has a simple structure and is easy to process, thereby improving the production efficiency of the cell assembly 100. In addition, the production requirements of the back contact cell assembly 100 are also met.

[0132] According to the battery cell assembly 100 of the second embodiment of the present invention, the battery cell assembly 100 is manufactured by the manufacturing method of the battery cell assembly 100 of the first embodiment of the present invention.

[0133] The battery cell assembly 100 according to the present invention is manufactured by the above manufacturing method, which improves the production efficiency of the battery cell assembly 100 and avoids short circuit of the battery cell assembly 100, thereby extending the service life of the battery cell assembly 100.

[0134] According to the battery string 200 of the third embodiment of the present invention, Figure 7 , including a battery cell assembly 100 according to the above-mentioned second aspect of the embodiment of the present invention.

[0135] For example, in Figure 7 In the example, the battery string 200 includes a plurality of battery cell assemblies 100, and the plurality of battery cell assemblies 100 are electrically connected to each other through a plurality of first electrical connection assemblies 4 and a plurality of second electrical connection assemblies 5. The first battery cell assembly 100 and the second battery cell assembly 100 are arranged at intervals in the up-down direction, and are electrically connected through a plurality of first electrical connection assemblies 4 and a plurality of second electrical connection assemblies 5. In this way, the current on the plurality of battery cell assemblies 100 can be collected through the plurality of first electrical connection assemblies 4 and the plurality of second electrical connection assemblies 5, thereby improving the current collection capacity of the battery string 200. In addition, short circuits in the battery string 200 are avoided, thereby extending the service life of the battery string 200. In addition, the processing technology of the battery string 200 is simplified, and the battery string 200 is easy to produce, thereby improving the production efficiency of the battery string 200. According to some embodiments of the present invention, referring to Figure 7 , the second grid lines between two adjacent battery cells 1 are electrically connected through a plurality of first electrical connection components, and the first grid lines between two adjacent battery cells 1 are electrically connected through a plurality of second electrical connection components. Figure 7 In the example, the same first electrical connection component 4 is electrically connected to the plurality of second grid lines 3 on the plurality of battery cell assemblies 100 that are opposite to each other in the vertical direction, and the same second electrical connection component 5 is electrically connected to the plurality of first grid lines 2 on the plurality of battery cell assemblies 100 that are opposite to each other in the vertical direction. Wherein, in the case of the third grid line 6 and the fourth grid line, the same first electrical connection component 4 is electrically connected to the third grid lines 6 on the plurality of battery cell assemblies 100 that are opposite to each other in the vertical direction, and the same second electrical connection component 5 is electrically connected to the fourth grid lines on the plurality of battery cell assemblies 100 that are opposite to each other in the vertical direction. With such a configuration, the first electrical connection component 4 can collect the current on the plurality of second grid lines 3 and / or the third grid line 6, and the second electrical connection component 5 can collect the current on the plurality of first grid lines 2 and / or the fourth grid line, so that the battery string 200 can be used normally for a long time.

[0136] A photovoltaic power generation system (not shown) according to an embodiment of a fourth aspect of the present invention comprises a battery string 200 according to an embodiment of the third aspect of the present invention.

[0137] According to the photovoltaic power generation system of the present invention, by adopting the above-mentioned battery string 200, short circuit of the photovoltaic power generation system is avoided, and the production difficulty of the photovoltaic power generation system is reduced, thereby improving the production efficiency of the photovoltaic power generation system.

[0138] Other structures and operations of the cell assembly 100, the cell string 200 and the photovoltaic power generation system according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0139] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0140] In the description of the present invention, the reference terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" mean 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 exemplary expressions of the above terms do not necessarily refer to the same embodiment or example.

[0141] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for manufacturing a battery cell assembly, characterized in that: The following steps are involved: A plurality of first electrical connection components and a plurality of second electrical connection components are arranged on the battery sheet: the first electrical connection components include first connection lines, the first connection lines are electrically connected to a plurality of second grid lines of the battery sheet respectively, and the first connection lines are spaced apart from the first grid lines along the Z direction; the second electrical connection components include second connection lines, the first connection lines and the second connection lines are spaced apart from each other along the X direction, the second connection lines are electrically connected to a plurality of first grid lines of the battery sheet respectively, and the second connection lines are spaced apart from each other along the Z direction; Among them, multiple first gate lines, multiple second gate lines, multiple first electrical connection components and multiple second electrical connection components are all arranged on one side surface of the battery cell in the thickness direction, multiple first gate lines and multiple second gate lines are alternately arranged along the Y direction, the polarities of the first gate lines and the second gate lines are opposite, and the X direction, the Y direction and the Z direction are orthogonal.

2. The method for manufacturing a battery cell assembly according to claim 1, characterized in that: The first connecting line includes a plurality of first connecting segments, the first electrical connection assembly also includes a plurality of first connecting components, the plurality of first connecting segments and the plurality of first connecting components are electrically connected in sequence, and the plurality of first connecting components are electrically connected to the plurality of second gate lines respectively; The second connecting line includes a plurality of second connecting segments, the second electrical connection assembly also includes a plurality of second connecting components, the plurality of second connecting segments and the plurality of second connecting components are electrically connected in sequence, and the plurality of second connecting components are electrically connected to the plurality of first gate lines respectively; The method of providing a plurality of first electrical connection components and a plurality of second electrical connection components on the battery sheet specifically includes: Printing the first gate line and the second gate line on the one side surface of the battery cell in the thickness direction; A plurality of the second connecting components are arranged on a plurality of the first gate lines, and a plurality of the first connecting components are arranged on the second gate lines, wherein the plurality of the first connecting components of each of the first electrical connection components are opposite to each other along the Y direction, and the plurality of the second connecting components of each of the second electrical connection components are opposite to each other along the Y direction, The first connecting section is connected between two adjacent first connecting components along the Y direction, and the second connecting section is connected between two adjacent second connecting components along the Y direction.

3. The method for manufacturing a battery cell assembly according to claim 2, characterized in that: The first connecting component is screen-printed or vapor-deposited on the side of the corresponding second gate line away from the battery cell, and the second connecting component is screen-printed or vapor-deposited on the side of the corresponding first gate line away from the battery cell.

4. The method for manufacturing a battery cell assembly according to claim 3, characterized in that: The vapor deposition includes physical vapor deposition or chemical vapor deposition.

5. The method for manufacturing a battery cell assembly according to claim 1, characterized in that: The first connecting line includes a plurality of first connecting segments, the first electrical connection assembly also includes a plurality of first connecting components, the plurality of first connecting segments and the plurality of first connecting components are electrically connected in sequence, and the plurality of first connecting components are electrically connected to the plurality of second gate lines respectively; The second connecting line includes a plurality of second connecting segments, the second electrical connection assembly also includes a plurality of second connecting components, the plurality of second connecting segments and the plurality of second connecting components are electrically connected in sequence, and the plurality of second connecting components are electrically connected to the plurality of first gate lines respectively; The method of providing a plurality of first electrical connection components and a plurality of second electrical connection components on the battery sheet specifically includes: Synchronously screen-printing the first gate line, the second gate line, the first connecting component and the second connecting component on the one side surface in the thickness direction of the battery cell; The first connecting section is connected between two adjacent first connecting portions along the Y direction, and the second connecting section is connected between two adjacent second connecting portions along the Y direction.

6. The method for manufacturing a battery cell assembly according to any one of claims 2 to 5, characterized in that: After providing a plurality of the first connecting components and a plurality of the second connecting components, the method further includes: A first protective layer is provided on the outer peripheral surface of the first connecting member; and / or, A second protective layer is provided on the outer peripheral surface of the second connecting component.

7. The method for manufacturing a battery cell assembly according to claim 6, characterized in that: The first protective layer and / or the second protective layer are provided by printing or electroplating.

8. The method for manufacturing a battery cell assembly according to any one of claims 2 to 5, characterized in that: The first connecting section and the first connecting component are bonded into an integrated structure; and / or, The second connecting section and the second connecting component are bonded into an integrated structure.

9. The method for manufacturing a battery cell assembly according to claim 8, characterized in that: The bonding process includes ultrasonic bonding, thermocompression bonding or thermosonic bonding.

10. The method for manufacturing a battery cell assembly according to any one of claims 2 to 5, characterized in that: The step of connecting the first connecting section between two adjacent first connecting components along the Y direction and connecting the second connecting section between two adjacent second connecting components along the Y direction specifically includes: A wire welding machine is used to connect the two ends of the first connecting section to the corresponding first connecting components respectively, and a wire welding machine is used to connect the two ends of the second connecting section to the corresponding second connecting components respectively.

11. The method for manufacturing a battery cell assembly according to claim 1, characterized in that: The first connecting line and / or the second connecting line includes a pure metal material, a metal-doped precious metal material, or a metal-doped rare earth metal material.

12. The method for manufacturing a battery cell assembly according to claim 1, characterized in that: The outer peripheral surface of the first connecting line is provided with a third protective layer; and / or, A fourth protective layer is provided on the outer peripheral surface of the second connecting line.

13. The method for manufacturing a battery cell assembly according to claim 12, characterized in that: The third protective layer and / or the fourth protective layer are made of tin, lead or bismuth.

14. A battery cell assembly, characterized in that: The battery cell assembly is manufactured by the manufacturing method of the battery cell assembly according to any one of claims 1-13.

15. A battery string, characterized in that: Comprising the battery cell assembly according to claim 14.

16. The battery string according to claim 15, characterized in that: The second gate lines between two adjacent battery cells are electrically connected via a plurality of the first electrical connection components, and the first gate lines between two adjacent battery cells are electrically connected via a plurality of the second electrical connection components.

17. A photovoltaic power generation system, characterized in that: Comprising the battery string according to claim 16.

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