Solder strip, battery piece and battery string

Abstract

The utility model relates to the field of photovoltaic cells, in particular to a solder strip, which comprises a solder strip body, a first electrode and a second electrode, and is characterized in that the solder strip body is provided with a connecting part; and the connecting piece is fixedly connected with the connecting part, the connecting piece is conductive, and at least part of the connecting piece has viscosity, so that the welding strip body can be bonded and conducted through the connecting piece. The technical problems that the battery piece processing procedure is tedious and the battery piece processing quality is low are solved, and the technical effects of simplifying the battery piece processing procedure and improving the battery piece processing quality are achieved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic cells, and in particular to a solder ribbon, a cell, and a cell string. Background Art

[0002] As an important part of a solar panel, the solder ribbon is mainly used to connect cells to achieve current collection and transmission. Traditional solder ribbon designs mainly focus on the stability of electrical conductivity and the reliability of welding strength, but there is still room for optimization in improving the overall efficiency of the panel and reducing costs. With the continuous development of photovoltaic technology, the requirements for the performance of the solder ribbon are also increasing. On the one hand, the solder ribbon needs to have excellent electrical conductivity to reduce current loss during transmission; on the other hand, the solder ribbon also needs to have good welding performance to ensure a firm and reliable connection with the cells. In addition, factors such as the material selection, size design, and production process of the solder ribbon will also directly affect the efficiency and cost of the panel.

[0003] In the prior art, the solder ribbon needs to be in one-to-one correspondence and cooperation with the grid lines on the surface of the cell to ensure that current can be smoothly introduced from the grid lines into the solder ribbon, thereby realizing the current collection and output of the entire panel. Although the existing solder ribbon designs can meet the basic connection and transmission requirements, there are still some challenges in the cooperation with the grid lines. For example, the contact area, contact quality, and cooperation accuracy between the solder ribbon and the grid lines directly affect the current transmission efficiency. If the contact is poor or the contact area is too small, it will cause current loss, affect the overall performance of the panel, and at the same time greatly increase the precision requirements for solder ribbon processing, resulting in cumbersome cell processing procedures and low cell processing quality.

[0004] Therefore, the technical problem of the prior art is: cumbersome cell processing procedures and low cell processing quality. Summary of the Utility Model

[0005] The present application provides a solder ribbon, a cell, and a cell string, which solve the technical problems of cumbersome cell processing procedures and low cell processing quality, and achieve the technical effects of simplifying cell processing procedures and improving cell processing quality.

[0006] In a first aspect, a solder ribbon provided by the present application adopts the following technical solution:

[0007] A solder ribbon includes: a solder ribbon body having a connecting portion; and a connecting member fixedly connected to the connecting portion, the connecting member being electrically conductive and at least partially having adhesiveness, so that the solder ribbon body can be bonded and conduct electricity through the connecting member.

[0008] Preferably, the connecting member has a first surface and a second surface. The first surface is fixedly connected to the connecting portion, and the second surface has adhesiveness for bonding to the battery cell body.

[0009] Preferably, the solder ribbon body is a triangular solder ribbon which has three side surfaces, and at least one of the side surfaces is defined as the connecting portion.

[0010] Preferably, the solder ribbon body is a circular solder ribbon, and at least part or all of the arc-shaped side surfaces of the circular solder ribbon are defined as the connecting portion.

[0011] Preferably, at least part or all of the surface of the solder ribbon body is provided with a reflective layer.

[0012] In a second aspect, a battery cell provided by the present application adopts the following technical solution:

[0013] A battery cell includes: a battery cell body; a solder ribbon which is the solder ribbon described above and is bonded to the battery cell body through a connecting member.

[0014] Preferably, the surface of the battery cell body has a conductive film, and the solder ribbon is bonded to the conductive film through a connecting member.

[0015] Preferably, the battery cell body is an HJT battery, an HBC battery, an HTBC battery or a Perovskite battery.

[0016] Preferably, the surface of the battery cell body has grid lines, and the solder ribbon is bonded to the grid lines through a connecting member.

[0017] Preferably, the battery cell body is a PERC battery, a TOPCon battery, an IBC battery, a TBC battery, an HPBC battery, an HJT battery, an HBC battery, an HTBC battery, an HTBC battery or a Perovskite battery.

[0018] In a third aspect, a battery string provided by the present application adopts the following technical solution:

[0019] A battery string includes: battery cells which are the battery cells described above, and there are multiple battery cells. Adjacent two battery cells are connected and conducted through a solder ribbon.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] 1. In this application, a sticky and conductive connector is provided on the solder tape. The solder tape can be easily pasted on the battery cell body without complex welding operations, simplifying the connection process with the battery cell. This connection method greatly simplifies the operation steps and reduces the requirements for professional skills. At the same time, the silver consumption required for welding is eliminated. It solves the technical problems of cumbersome battery cell processing procedures and low battery cell processing quality, achieving the technical effects of simplifying the battery cell processing procedures and improving the battery cell processing quality.

[0022] 2. The width design of the connector solves the problem of matching with the grid line width. Even if there is a certain positional deviation between the solder tape and the grid line, it can ensure a good conductive contact area; reduces the risk of connection failure caused by improper welding operations; eliminates the dependence on precise alignment between the solder tape and the grid line, significantly improving the fault tolerance of the solder tape, making the installation process of the solder tape more flexible, and reducing the connection defects or efficiency losses caused by alignment problems.

[0023] 3. The bonding form of the solder tape is not only applicable to battery cells with a conductive film. The solder tape conducts electricity by bonding to the conductive film and the battery cell, eliminating the step of setting grid lines on the battery cell, achieving simplified steps and reduced silver consumption; at the same time, it is also applicable to battery cells with grid lines. The solder tape conducts electricity by bonding to the solder tape and the battery cell; the applicable range is relatively wide.

[0024] 4. The design feature that the solder tape can be selected in various shapes makes the solder tape in this application show extremely high flexibility and versatility in application, providing great convenience and diversity for the manufacture of photovoltaic modules. Solder tapes in various shapes can meet the design requirements of different photovoltaic modules. At the same time, solder tapes in various shapes improve the manufacturing efficiency of photovoltaic modules. The appropriate solder tape shape can be selected according to specific needs, thereby optimizing the production process, reducing unnecessary processing and adjustment steps, which not only reduces the production cost but also improves the production efficiency, making the manufacture of photovoltaic modules more efficient and economical.

[0025] 5. A reflective layer is provided on the surface of the solder tape. The reflective layer can effectively reflect the part of the sunlight that is not directly absorbed by the battery cell. These reflected light rays are captured by the battery cell again, increasing the utilization rate of light energy by the battery, thereby improving the photoelectric conversion efficiency, enabling the battery to make more full use of solar energy resources, and enhancing the overall power generation performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the solder tape described in this application;

[0027] Figure 2 is a schematic diagram of the triangular solder tape described in this application;

[0028] Figure 3 is a schematic diagram of the circular solder tape described in this application;

[0029] Figure 4 It is a schematic diagram of the flat solder ribbon described in this application;

[0030] Figure 5 It is a schematic diagram of the reflective layer of the solder ribbon described in this application;

[0031] Figure 6 It is a schematic diagram of the solar cell described in this application.

[0032] Explanation of reference numerals in the drawings: 100, solder ribbon; 110, solder ribbon body; 120, connecting part; 130, connecting piece; 131, first side; 132, second side; 140, triangular solder ribbon; 141, side; 150, circular solder ribbon; 151, arc-shaped side; 160, flat solder ribbon; 170, reflective layer; 200, solar cell; 210, solar cell body; 211, grid line; 212, conductive film; 300, solar cell string. Detailed implementation manners

[0033] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in this application, unless otherwise specified, both include direct and indirect connection (coupling). In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to this application.

[0034] In this application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0035] The embodiments of this application provide a solder ribbon, a solar cell and a solar cell string, which solve the technical problems of cumbersome processing procedures and low processing quality of solar cells, and achieve the technical effects of simplifying the processing procedures of solar cells and improving the processing quality of solar cells.

[0036] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] The present application provides a solder ribbon 100, as Figure 1-4 shown, for connecting to the battery cell body 210 to form a battery cell 200, including a solder ribbon body 110 and a connecting member 130. The solder ribbon body 110 serves as the main body of the solder ribbon 100, and the connecting member 130 is used to connect the solder ribbon body 110 and the battery cell 200. It is worth noting that the battery cell 200 has grid lines 211 and / or a conductive film 212, and the connecting member 130 is used to cooperate and connect with the grid lines 211 and / or the conductive film 212 on the battery cell 200, so that the solder ribbon body 110 is connected and conducted with the battery cell 200 through the connecting member 130.

[0038] The solder ribbon body 110, as Figure 1-4 shown, the solder ribbon body 110 serves as the main body of the solder ribbon 100. The solder ribbon body 110 has a connecting portion 120, and the connecting portion 120 is used to arrange the connecting member 130, that is, the connecting portion 120 of the solder ribbon body 110 serves as the area in direct or indirect contact with the battery cell body 210. In one embodiment, the connecting portion 120 is connected to the battery cell body 210 by arranging the connecting member 130. The solder ribbon body 110, as the main part of the solder ribbon 100, is usually made of materials with good electrical conductivity, such as metals or alloys such as copper, nickel, or silver. These materials not only have good electrical conductivity but also have a relatively high melting point and can withstand the high temperature during the welding process. The shape and size of the solder ribbon body 110 are designed according to specific application requirements to ensure the effective contact area and connection strength with the silicon wafer. In one embodiment, the solder ribbon body 110 is rolled and annealed from metal materials such as copper / copper tin alloy / copper tin silver alloy / aluminum / aluminum alloy that meet the requirements of electricity, mechanics, and reliability.

[0039] As Figure 1-4As shown, the shape of the solder ribbon body 110 can be set based on the actual application environment and requirements. Solder ribbon bodies 110 with different shapes can adapt to different connection requirements and working environments, improving connection efficiency, power generation efficiency, and stability. In one embodiment, the solder ribbon body 110 can be a triangular solder ribbon 140. The triangular solder ribbon 140 has three sides 141, and at least one of the sides 141 is defined as a connection portion 120. The connector 130 is disposed on the connection portion 120 and thus connected to the battery cell body 210. Further, two or three of the sides 141 of the triangular solder ribbon 140 can be defined as connection portions 120, that is, connectors 130 are disposed on two or three of the sides 141. In another embodiment, the solder ribbon body 110 is a circular solder ribbon 150. At least a partial arc-shaped side 151 of the circular solder ribbon 150 is positioned as a connection portion 120. The connector 130 is disposed on the connection portion 120 and thus connected to the battery cell body 210. Further, the entire arc-shaped side 151 of the circular solder ribbon 150 can be defined as a connection portion 120, that is, connectors 130 are disposed on the entire arc-shaped side 151 of the circular solder ribbon 150. In other embodiments, the solder ribbon body 110 can also be a flat solder ribbon 160.

[0040] Further, as Figure 5 shown, the solder ribbon body 110 has a reflective layer 170. The reflective layer 170 is disposed on a partial surface or the entire surface of the solder ribbon body 110. The reflective layer 170 is used to reflect light and improve the light utilization rate. Among them, the reflective layer 170 can be set in the form of hanging plating or electroplating, and the reflective layer 170 can be made of metals with high reflectivity such as silver, nickel, and tin.

[0041] The connector 130, such as Figure 2-4As shown, the connector 130 is used to connect the solder strip body 110 and the battery cell body 210 . The connector 130 is arranged on the connecting portion 120 of the welding strip body 110. Further, the connector 130 is fixedly connected to the connecting portion 120 of the welding strip body 110. The connector 130 can be arranged in a strip shape or a point shape parallel to and corresponding to the welding strip body 110; wherein the connector 130 is conductive and at least partially adhesive, so that the welding strip body 110 can be adhered to the battery cell body 210 through the connector 130 and conduct with the battery cell body 210; further, the connector 130 can be set to be entirely adhesive or only have one side in contact with the battery cell body 210, thereby achieving adhesion of the connector 130 to the battery cell body 210; in one embodiment, the connector 130 has a first surface 131 and a second surface 132, the first surface 131 is fixedly connected to the connecting portion 120 of the welding strip body 110, the second surface 132 is adhesive, and the second surface 132 is used to connect the battery cell body 210. Furthermore, the connector 130 has both viscosity and conductivity, and the connector 130 can be made of a polymer composite material containing conductive materials such as copper powder / silver powder / tin powder / tin-copper alloy powder / tin-copper-silver alloy powder / graphite / graphene, including polymers such as resin.

[0042] Furthermore, regarding the layout and connection of the welding ribbon 100, the welding ribbon 100 first needs to be laid out on the surface of the battery cell body 210 according to a preset position and pressed tightly, and the connector 130 is softened by heating methods such as hot air, infrared, and electromagnetic induction, so as to achieve a firm bond between the connector 130 and the battery cell body 210.

[0043] The present application provides a battery cell 200, such as Figure 2-4 6, including a cell body 210 and a soldering strip 100, wherein the soldering strip 100 is the above-mentioned soldering strip 100. The cell body 210 has a conductive film 212, which is generally a TCO transparent conductive film, and the conductive film 212 is a structure that is provided by part of the cell 200 itself. The soldering strip body 110 can be conveniently bonded to the conductive film 212 of the cell body 210 through the connector 130, thereby realizing the conduction between the soldering strip 100 and the cell body 210. It is worth noting that when the cell body 210 has a conductive film 212, the cell body 210 can omit the setting of the gate line 211, and the silicon substrate of the cell body 210 can achieve conduction with the soldering strip body 110 through the conductive film 212 and the connector 130. In one embodiment, the cell body 210 having a transparent conductive film 212 can be a HJT cell, an HBC cell, a HTBC cell or a Perovskite cell.

[0044] The present application also provides a battery cell 200, such as Figure 2-4, as shown in Figures 6, it includes a battery cell body 210 and a solder ribbon 100, and the solder ribbon 100 is the above-mentioned solder ribbon 100. The battery cell body 210 has grid lines 211. The solder ribbon body 110 can be conveniently bonded to the grid lines 211 of the battery cell body 210 through a connector 130, realizing the conduction between the solder ribbon 100 and the battery cell body 210. This not only simplifies the manufacturing process, improves production efficiency, but also increases the error tolerance rate of the layout of the solder ribbon 100, reducing the production difficulty and cost. The battery cell body 210 can be, including but not limited to, PERC cells, TOPCon cells, IBC cells, TBC cells, HPBC cells, HJT cells, HBC cells, HTBC cells, or Perovskite cells. It is worth noting that among them, HJT cells, HBC cells, HTBC cells, or Perovskite cells have a conductive film. Even in the case of having a conductive film, grid lines 211 can still be provided on the battery cell body, and then connectors can be bonded on the grid lines 211, rather than only using the above-mentioned method of bonding the solder ribbon to the conductive film for conduction.

[0045] The solder ribbon body 110 is bonded to the grid lines 211 of the battery cell body 210 through a connector 130. Among them, the width of the connector 130 is greater than or equal to the width of the grid lines 211. There is no need to ensure the precise one-to-one correspondence between the connector 130 and the grid lines 211, enabling the solder ribbon 100 to have a certain error tolerance rate during layout and improving the processing efficiency of the solder ribbon 100. By ensuring that the width of the connector 130 is greater than or equal to the width of the grid lines 211, even if there is a certain positional deviation when the solder ribbon 100 is laid out, it can be ensured that the connector 130 can completely cover the grid lines 211 to achieve effective connection. This design greatly improves the processing efficiency of the solder ribbon 100, reduces the production cost, and at the same time ensures the performance and stability of the battery cell 200. It can be understood that when the width of the solder ribbon 100 is equal to the width of the grid lines 211, the solder ribbon 100 just covers and bonds to the grid lines 211; when the width of the solder ribbon 100 is greater than the width of the grid lines 211, while the solder ribbon 100 is bonded to the grid lines 211, the area of the solder ribbon 100 exceeding the grid lines 211 covers and bonds to the battery cell 200.

[0046] It should be explained that the battery cell body 210 refers to a silicon wafer that has been processed and is to be assembled with a solder ribbon or has a conductive film.

[0047] This application also provides a battery string 300, which has the above-mentioned battery cells 200. There are multiple battery cells 200 arranged in sequence, and adjacent two battery cells 200 are connected and conducted through a solder ribbon, thereby forming a battery string 300.

[0048] Working principle / steps:

[0049] The stable connection with the solar cell 200 is achieved through the solder ribbon body 110 and the connecting member 130. The solder ribbon body 110, as the main part of the solder ribbon 100, is made of a metal material with good electrical conductivity to ensure its good electrical conductivity. The solder ribbon body 110 can be designed in various shapes, such as the triangular solder ribbon 140 or the circular solder ribbon 150, to adapt to different connection requirements and working environments. The connecting member 130 is the key connecting part between the solder ribbon body 110 and the solar cell body 210. The connecting member 130 is fixedly connected to the connecting part 120 of the solder ribbon body 110 and has electrical conductivity and adhesiveness. The connecting member 130 can be made of a polymer composite material containing a conductive material, which not only ensures the electrical conductivity but also has a certain adhesiveness, enabling the solder ribbon 100 to be easily adhered to the grid line 211 of the solar cell body 210. During the connection process of the solder ribbon 100 and the solar cell body 210, first, the solder ribbon 100 needs to be laid on the surface of the solar cell body 210 according to the preset position and pressed tightly. Then, heating methods such as hot air, infrared, and electromagnetic induction are used to soften the connecting member 130, thereby achieving a firm adhesion between the connecting member 130 and the solar cell body 210. Since the width of the connecting member 130 is greater than or equal to the width of the grid line 211, there is no need to ensure the precise one-to-one correspondence between the connecting member 130 and the grid line 211, which greatly increases the error tolerance rate of the layout of the solder ribbon 100 and improves the processing efficiency. At the same time, this design also ensures the stable connection and conduction between the solder ribbon 100 and the solar cell body 210, enabling the solar cell 200 to function properly and convert light energy into electrical energy. When sunlight shines on the solar cell 200, the solar cell 200 absorbs the light energy and converts it into electrical energy. Due to the stable connection between the solder ribbon 100 and the solar cell 200, the electrical energy can be smoothly transmitted from the solar cell 200 to the solder ribbon 100, and then the output and utilization of the electrical energy are realized.

[0050] Technical effects:

[0051] 1. In this application, a connecting member 130 with adhesiveness and electrical conductivity is provided on the solder ribbon 100. The solder ribbon 100 can be easily pasted on the solar cell body 210 without complex welding operations, simplifying the connection process with the solar cell 200. This connection method greatly simplifies the operation steps and reduces the requirements for professional skills; at the same time, the silver consumption required for welding is eliminated. It solves the technical problems of the cumbersome processing procedures of the solar cell 200 and the low processing quality of the solar cell 200, and achieves the technical effects of simplifying the processing procedures of the solar cell 200 and improving the processing quality of the solar cell 200.

[0052] 2. The width design of the connector 130 solves the problem of matching with the width of the grid line 211. Even if there is a certain positional deviation between the solder tape 100 and the grid line 211, it can ensure a good conductive contact area, reduce the risk of connection failure caused by improper welding operations, eliminate the dependence on precise alignment between the solder tape 100 and the grid line 211, significantly improve the fault tolerance of the solder tape 100, make the installation process of the solder tape 100 more flexible, and reduce the poor connection or efficiency loss caused by alignment problems.

[0053] 3. The bonding form of the solder tape 100 is not only applicable to the cell 200 with the conductive film 212. The solder tape 100 is electrically connected to the cell 200 by bonding to the conductive film 212, eliminating the step of setting the grid line 211 on the cell 200, achieving simplified steps and reduced silver consumption. At the same time, it is also applicable to the cell 200 with the grid line 211. The solder tape 100 is electrically connected to the cell 200 by bonding to the solder tape 100. The applicable range is relatively wide.

[0054] 4. The design feature that the solder tape 100 can select various shapes makes the solder tape 100 in this application show extremely high flexibility and versatility in application, providing great convenience and diversity for the manufacture of photovoltaic modules. The solder tapes 100 with various shapes can meet the design requirements of different photovoltaic modules. At the same time, the solder tapes 100 with various shapes improve the manufacturing efficiency of photovoltaic modules. The appropriate shape of the solder tape 100 can be selected according to specific requirements, thereby optimizing the production process, reducing unnecessary processing and adjustment steps. This not only reduces the production cost, but also improves the production efficiency, making the manufacture of photovoltaic modules more efficient and economical.

[0055] A reflective layer 170 is provided on the surface of the solder tape 100. The reflective layer 170 can effectively reflect the part of the sunlight that is not directly absorbed by the cell 200. These reflected light rays are captured by the cell 200 again, increasing the utilization rate of light energy by the cell, thereby improving the photoelectric conversion efficiency, enabling the cell to make more full use of solar energy resources, and enhancing the overall power generation performance of the cell.

[0056] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0057] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A welding strip, characterized in that: include: A welding strip body (110), wherein the welding strip body (110) has a connecting portion (120); A connecting member (130) is fixedly connected to the connecting portion (120), the connecting member (130) is electrically conductive, and at least part of the connecting member (130) is adhesive, so that the welding strip body (110) can be bonded to the battery cell through the connecting member (130) and conduct electricity.

2. The welding strip according to claim 1, characterized in that: The connecting member (130) has a first surface (131) and a second surface (132), the first surface (131) is fixedly connected to the connecting portion (120), the second surface (132) is adhesive, and the second surface (132) is used to bond to the battery cell body (210).

3. The welding strip according to claim 1, characterized in that: The welding strip body (110) is a triangular welding strip (140), and the triangular welding strip (140) has three side surfaces (141), wherein at least one side surface (141) is defined as a connecting portion (120).

4. The welding strip according to claim 1, characterized in that: The welding strip body (110) is a circular welding strip (150), and at least part or all of the arc-shaped side surfaces (151) of the circular welding strip (150) are defined as the connecting portion (120).

5. The welding strip according to claim 3 or 4, characterized in that: At least a portion of the surface of the welding strip body (110) or the entirety thereof is provided with a reflective layer (170).

6. A battery cell, characterized in that: include: Battery cell body (210); A welding strip (100), wherein the welding strip (100) is the welding strip (100) according to any one of claims 1 to 5, and the welding strip (100) is bonded to the battery cell body (210) through a connecting piece (130).

7. The battery cell according to claim 6, characterized in that: The surface of the battery cell body (210) is provided with a conductive film (212), and the welding strip (100) is bonded to the conductive film (212) via a connecting piece (130).

8. The battery cell according to claim 7, characterized in that: The battery cell body (210) is a HJT battery, an HBC battery, a HTBC battery or a Perovskite battery.

9. The battery cell according to claim 6, characterized in that: The surface of the battery cell body (210) is provided with a grid line (211), and the welding strip (100) is bonded to the grid line (211) via a connecting piece (130).

10. The battery cell according to claim 9, characterized in that: The cell body (210) is a PERC cell, a TOPCon cell, an IBC cell, a TBC cell, an HPBC cell, an HJT cell, an HBC cell, an HTBC cell or a Perovskite cell.

11. The battery cell according to claim 9 or 10, characterized in that: The width of the connecting member (130) is greater than or equal to the width of the gate line (211).

12. A battery string, characterized in that: include: A battery cell (200), wherein the battery cell (200) is the battery cell (200) according to any one of claims 6 to 10, and there are a plurality of battery cells (200), and two adjacent battery cells (200) are connected and conducted via a welding strip.

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