Battery string and photovoltaic module

Abstract

The present application provides a battery string and a photovoltaic module. The battery string comprises battery cells and conductive members. Each battery cell comprises a first connecting member and a plurality of first fine grid electrodes which are arranged on a first surface of the battery cell; the first connecting member is arranged close to the edge of the battery cell and is electrically connected to at least one first fine grid electrode; and the side edge of the first connecting member is provided with a first protruding portion connected to the first connecting member, and the first protruding portion protrudes from the first connecting member towards the edge of the battery cell in a first direction. Each conductive member extends in the first direction and is connected to the corresponding first connecting member; and the conductive member is provided with an extension end, the extension end is the part of the conductive member extending out of the side edge of the first connecting member close to the battery cell, and the length of the extension end in the first direction is greater than that of the first protruding portion in the first direction. The first protruding portions isolate the conductive members from the battery cells, to prevent the fine grid electrodes near a pad from breaking due to a high welding temperature, thereby reducing damage to the battery cells caused by the high welding temperature.

Description

Battery strings and photovoltaic modules Technical Field

[0001] This application relates to the field of photovoltaic technology, and more specifically, to battery strings and photovoltaic modules. Background Technology

[0002] The electrodes of a solar cell play a crucial role in collecting and transporting electrons. When assembling photovoltaic modules using multiple solar cells, solder ribbons are often used to connect the electrodes of adjacent cells. Solar cell electrodes consist of main grids and fine grids of different polarities, which are alternated and spaced apart. During the soldering process, the solder ribbon tip can easily come into accidental contact with an electrode of opposite polarity, causing a short circuit. It can also easily come into contact with the cell during soldering, and the high temperature during soldering can cause the fine grids near the solder pads to break off. These issues result in low reliability of the solder ribbon connection and reduced assembly quality of the photovoltaic module.

[0003] Improving the success rate of solder strip connection and preventing the breakage of the fine grid around the solder pads during the soldering process are technical problems that need to be solved. Summary of the Invention

[0004] The battery string and photovoltaic module provided in this application can solve at least one of the above-mentioned technical problems.

[0005] This application provides an embodiment of a battery string that is implemented as follows:

[0006] A battery string includes battery cells, an insulator, and a conductive element. The battery cells include a plurality of first fine grid electrodes, a plurality of second fine grid electrodes, and a first connector on a first surface. The first and second fine grid electrodes have opposite polarities and are alternately spaced along a first direction. The first connector is disposed near the edge of the battery cell and is electrically connected to at least one of the first fine grid electrodes. The insulator is disposed between the first connector and the edge of the battery cell and covers at least a portion of one of the second fine grid electrodes. The conductive element extends along the first direction and connects to the first connector, and has an extension end. The extension end is a portion of the conductive element extending beyond the side of the first connector near the edge of the battery cell, and the extension end is at least partially disposed on the insulator. The thickness of the insulator is h1, and the thickness of the conductive element is h2, wherein h1 / h2 ≥ 10%. The battery string of this application uses an insulating component to isolate the extension end of the conductive component from the electrode structure, reducing the risk of the extension end coming into contact with the electrode of the opposite polarity. Furthermore, by constraining the dimensional relationship between the thickness of the insulating component and the thickness of the conductive component, it ensures that even if the conductive component has burrs due to the manufacturing process, the burrs will not puncture the insulating component, further reducing the risk of short circuits and significantly improving the connection safety and success rate of the conductive component.

[0007] Embodiments of this application also provide a battery string, including battery cells and conductive elements. The battery cell includes a first connector and a plurality of first fine grid electrodes on its first surface; the first connector is disposed near the edge of the battery cell and is electrically connected to at least one of the first fine grid electrodes; a first protrusion connected to the first connector is provided on the side of the first connector, the first protrusion protruding from the first connector along a first direction toward the edge of the battery cell. The conductive element extends along the first direction and connects to the first connector, and has an extension end; the extension end is the portion of the conductive element extending out of the side of the first connector near the edge of the battery cell, and the length of the extension end along the first direction is greater than the length of the first protrusion along the first direction. The first protrusion can isolate the conductive element from the battery cell during the welding process between the first connector and the conductive element, reducing the problem of battery cell damage due to high welding temperatures, and improving the assembly quality of the photovoltaic module. Furthermore, the first protrusion can also be used to connect the first fine grid electrodes and the first connector, ensuring the electrical connection between the first connector and the first fine grid electrodes while reducing the manufacturing precision requirements of the first connector. The first protrusion can also increase the electrical contact area between the conductive component and the first connector, thereby improving the connection reliability between the conductive component and the first connector.

[0008] Embodiments of this application also provide a photovoltaic module, including a plurality of battery strings as described in the above embodiments, wherein the plurality of battery strings are connected in parallel or in series. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 is a partial structural diagram of the battery string according to the first embodiment of this application.

[0011] Figure 2 is a partial cross-sectional view of the battery string shown in Figure 1.

[0012] Figure 3 is a partial cross-sectional view of the battery string in the second embodiment.

[0013] Figure 4 is a partial structural diagram of the battery string in the second embodiment.

[0014] Figure 5 is a partial structural diagram of the battery string in the third embodiment.

[0015] Figure 6 is a partial structural diagram of the battery string in the fourth embodiment.

[0016] Figure 7 is a partial structural diagram of the battery string in the fifth embodiment.

[0017] Figure 8 is a partial structural diagram of the battery string in the sixth embodiment.

[0018] Key component symbols: Battery string 100, Battery cell 10, First side 11, Second side 12, Corner 13, First electrode 20, First main grid electrode 21, First fine grid electrode 22, First connector 30, First protrusion 31, Bonding layer 32, Connecting wire 33, Insulator 40, Conductive component 50, Extension end 51, Protrusion 52, Second electrode 60, Second main grid electrode 61, Second fine grid electrode 62, Bent end 63, Second connector 70, First direction A, Second direction B

[0019] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0020] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0021] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] Some embodiments of this application are described in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0024] Referring to Figures 1 and 2, this embodiment provides a battery string 100, including a battery cell 10, an insulating member 40, and a conductive member 50. Figure 1 is a partial structural schematic diagram of the battery string 100, and Figure 2 is a cross-sectional view of the battery string 100 along the extension direction of the conductive member 50. The battery cell 10 includes a first electrode 20, a second electrode 60, and a first connector 30 on its first surface. The first electrode 20 and the second electrode 60 have opposite electrode polarities. The first electrode 20 includes a plurality of first fine grid electrodes 22, and the second electrode 60 includes a plurality of second fine grid electrodes 62. The first fine grid electrodes 22 and the second fine grid electrodes 62 have opposite electrode polarities, and the first fine grid electrodes 22 and the second fine grid electrodes 62 are alternately spaced along a first direction A. The first connector 30 is disposed near the edge of the battery cell 10 and is electrically connected to at least one of the first fine grid electrodes 22. The insulating member 40 is disposed between the first connector 30 and the edge of the battery cell 10 and covers at least a portion of one of the second fine grid electrodes 62. The conductive element 50 extends along a first direction A and connects to the first connector 30. The conductive element 50 has an extension end 51, which is the portion of the conductive element 50 extending out of the side of the first connector 30 near the edge of the battery cell 10. The extension end 51 is at least partially disposed on the insulating element 40. The thickness of the insulating element 40 is h1, and the thickness of the conductive element 50 is h2, wherein h1 / h2 ≥ 10%.

[0025] In one embodiment of this application, the cell 10 in the battery string 100 can be a back-contact solar cell, with the first surface of the cell 10 being a back-light surface to reduce the shading of the front surface of the cell 10 by the electrodes, thereby improving the energy conversion efficiency of the cell 10. Correspondingly, structures such as the insulating component 40 and the conductive component 50 can also be disposed on the back-light surface of the cell 10. In other embodiments, the first surface of the cell 10 can also be a light-facing surface, as long as the design requirements are met; this application is not limited to this.

[0026] We found that the thicker the conductive component 50, the longer the burr length after cutting, and the greater the risk of short circuits when it connects to the solar cell. For example, when the conductive component is 350 micrometers thick, the burr length is approximately 20-35 micrometers. During lamination, at least a portion of the burr will be pressed into the insulating component 40. Therefore, it is safer to design the insulating component with a thickness greater than or equal to 35 micrometers. When the conductive component is 200 micrometers thick, the burr length is approximately 10-20 micrometers. During lamination, at least a portion of the burr will be pressed into the insulating component 40. Therefore, it is safer to design the insulating component with a thickness greater than or equal to 20 micrometers. The battery string 100 of this application isolates the extension end 51 of the conductive element 50 from the electrode structure through the insulating element 40, reducing the risk of the extension end 51 coming into contact with the electrode of opposite polarity. Furthermore, by constraining the dimensional relationship between the thickness of the insulating element 40 and the thickness of the conductive element 50, it ensures that even if the conductive element 50 has burrs due to the manufacturing process, the burrs will not pierce the insulating element 40, further reducing the risk of short circuit and significantly improving the connection safety and success rate of the conductive element 50.

[0027] In one embodiment of this application, the battery cell 10 can be considered as a gridless (OBB) battery cell, where the entire battery cell lacks a traditional grid structure. In other embodiments, as shown in Figures 1 to 4, the battery cell 10 can also be a conventional battery cell with a grid structure. The first electrode 20 may further include a first grid electrode 21, and a first fine grid electrode 22 connected to the first grid electrode 21. The second electrode 60 may further include a second grid electrode 61, and a second fine grid electrode 62 connected to the second grid electrode 61. The first grid electrode 21 and the second grid electrode 61 are arranged parallel to and spaced apart along a second direction B, where the first direction A intersects the second direction B. The second fine grid electrode 62 is spaced apart from the first connector 30 to avoid electrical connection between the second fine grid electrode 62 and the first fine grid electrode 22, which could cause an internal short circuit in the battery string 100.

[0028] In one embodiment, the number of first main gate electrodes 21 and second main gate electrodes 61 can also be multiple. Multiple second main gate electrodes 61 and multiple first main gate electrodes 21 are staggered and spaced apart in the second direction B. Multiple first fine gate electrodes 22 and multiple second fine gate electrodes 62 are arranged at intervals between the first main gate electrodes 21 and the second main gate electrodes 61 along the first direction A.

[0029] In one embodiment of this application, the first connector 30 may be a pad structure disposed on the surface of the battery cell 10, and the conductive element 50 may be a metal solder strip, which is soldered to the first connector 30. The conductive element 50 in the form of a solder strip may cover one or more first fine grid electrodes 22 to achieve electrical connection with the first fine grid electrodes 22. The insulating element 40 may be, but is not limited to, insulating adhesive. The extension end 51 is a strip-shaped area between the end of the conductive element 50 and the outer side of the first connector 30 (the side near the edge of the battery cell). The extension end 51 overlaps the upper surface of the insulating element 40, and the insulating element 40 isolates the extension end 51 of the conductive element 50 from the electrodes to prevent short circuits. In the first direction A, the length of the insulating element 40 is greater than the length of the extension end 51. In the second direction B, the width of the insulating element 40 is greater than the width of the first connector 30. Thus, even if the extension end 51 shakes or shifts during installation, it will not easily come into contact with the electrodes on the surface of the battery cell 10 within the surface area of ​​the insulating component 40, thereby improving the safety of the battery string 100. In one embodiment, as shown in Figures 2 and 3, the upper surface of the first connector 30 is also provided with a bonding layer 32. The bonding layer 32 is conductive and can connect the first connector 30 and the conductive component 50 during the welding process. Optionally, the material of the bonding layer 32 can be solder, conductive adhesive, or low-temperature solder, etc.

[0030] In some embodiments, the thickness h2 of the conductive component 50 is 150μm-350μm, and the thickness h1 of the insulating component 40 is 30μm-100μm. A greater thickness of the insulating component 40 results in higher safety performance. A greater thickness of the conductive component 50 results in lower resistance. However, excessive thickness of both the insulating component 40 and the conductive component 50 can affect installation performance and increase product costs. This application embodiment further constrains the dimensional range of the conductive component 50 and the insulating component 40, thereby reducing the resistance of the conductive component 50 while maintaining connection safety and keeping economic costs within an acceptable range.

[0031] In some embodiments, as shown in FIG2, the side of the extension end 51 located on the insulating member 40 has a protrusion 52 (spiked barb). The protrusion 52 is partially inserted into the insulating member 40, and the depth of insertion of the protrusion 52 into the insulating member 40 is less than the thickness of the insulating member 40, so as to prevent the protrusion 52 from contacting the electrode of opposite polarity below the insulating member 40 and short-circuiting. The protrusion 52 and the main body of the conductive member 50 are integrally formed. The protrusion 52 can be formed on the outer edge of the extension end 51 when the conductive member 50 is cut or trimmed. When the conductive member 50 is welded together with the first connector 30, the extension end 51 can be positioned on the surface of the insulating member 40 by the protrusion 52, thereby constraining the degree of freedom of the extension end 51 and preventing the extension end 51 from shaking and accidentally contacting the electrode of opposite polarity.

[0032] The insulating component 40 is mainly used to cover the second fine gate electrode 62 that intersects with the extension end 51, thereby isolating the extension end 51 from the second fine gate electrode 62 and reducing short circuits.

[0033] In some embodiments, along the first direction A, a first protrusion 31 is provided on the side of the first connector 30, which is connected to the first connector 30. The first protrusion 31 is electrically connected to at least one first fine grid electrode 22, and the first protrusion 31 is spaced apart from the second fine grid electrode 62. The conductive member 50 covers the first protrusion 31. When the conductive member 50 is welded to the first connector 30, the first protrusion 31 can isolate the battery cell 10 at the edge of the first connector 30 from contact with the conductive member 50, so that the battery cell 10 is protected from the heat of welding, preventing the fine grid near the solder pad from breaking, and reducing the damage to the battery cell 10 during the welding process. The first protrusion 31 can also increase the electrical contact area between the first connector 30 and the conductive member 50, improving the connection reliability between the conductive member 50 and the first connector 30.

[0034] In Figures 1 to 4, the first protrusion 31 is directly connected to the first connector 30, and the first protrusion 31 is directly electrically connected to the first fine grid electrode 22 of the same polarity closest to the first connector 30. In other embodiments, as shown in Figure 5, unlike Figure 1, the first protrusion 31 is electrically connected to at least one of the first fine grid electrodes 22 via a connecting line 33. The number of first protrusions 31 can be one, two, or more, arranged along the second direction B, for example, at least two first protrusions 31 spaced apart, with the distance between adjacent first protrusions 31 being less than the dimension of the conductive member 50 along the second direction B, so that the conductive member 50 can cover multiple first protrusions 31. Each first protrusion 31 is connected to a corresponding connecting line 33. Replacing large first protrusions 31 with smaller first protrusions 31 reduces the area occupied by a single first protrusion 31 on the battery cell 10, adapting to different installation requirements.

[0035] In one embodiment of this application, along the first direction A, the conductive element 50 extends from opposite sides of the first connector 30, and two first protrusions 31 are also respectively disposed on opposite sides of the first connector 30 to contact and support the portion of the conductive element 50 extending from the side of the first connector 30. Further, along the first direction A, a first fine gate electrode 22 is connected to each opposite side of the first connector 30. When the first connector 30 experiences positional deviation due to manufacturing process influences, the provision of the first protrusions 31 ensures the electrical connection between the first fine gate electrode 22 and the first connector 30, while preventing the first fine gate electrode 22 closest to the side of the first connector 30 from being soldered off.

[0036] In one embodiment of this application, along the first direction A, the length L1 of the first protrusion 31 is less than the distance between the adjacent first fine grid electrode 22 and the second fine grid electrode 62, so that when the first protrusion 31 is connected to the first fine grid electrode 22, it maintains a spacing with the second fine grid electrode 62, so as to avoid the first protrusion 31 contacting the second fine grid electrode 62 and reduce the risk of internal short circuit in the battery string 100.

[0037] In some embodiments, as shown in Figures 1, 2, 5, and 6, along the first direction A, the length L1 of the first protrusion 31 can be greater than the distance between the insulating member 40 and the side of the first connector 30, and the insulating member 40 can cover part of the first protrusion 31. This allows the insulating member 40 to fully cover the second fine gate electrode 62 adjacent to the first connector 30, reducing the problem of the second fine gate electrode 62 being exposed below the extension end 51 due to manufacturing process errors.

[0038] In other embodiments, as shown in Figures 3 and 4, the length L1 of the first protrusion 31 may be less than the distance between the side of the insulating member 40 and the first connecting member 30, so that the first protrusion 31 and the insulating member 40 are spaced apart, thereby reducing the risk of the insulating member 40 being damaged by high temperature during the welding process.

[0039] The extension end 51 of the conductive element 50 is essential for welding. The extension end 51 is used to press the end of the solder strip (i.e., the extension end 51) of the outermost pressure pin during serial welding, facilitating welding while ensuring certain welding tolerances and preventing welding defects caused by the vertical expansion and contraction of the conductive element 50. In some embodiments, the distance L2 by which the extension end 51 extends beyond the side of the first connector 30 (excluding the first protrusion) is 2mm-5mm. By constraining the size of the extension end 51 extending beyond the first connector 30, excessive freedom due to excessive length is avoided, reducing the problem of short circuits caused by the extension end 51 deviating from the insulating element 40. Further, as shown in Figures 1 and 2, along the first direction A, the extension end 51 intersects at least two second fine grid electrodes 62. This allows the size of the extension end 51 to be controlled within a reasonable range, reducing the problem of the pressure fixture being unable to press the extension end 51 during welding due to excessive length, thus improving welding yield.

[0040] As shown in Figures 2 and 3, in some embodiments, the extension end 51 is positioned away from the upper surface of the battery cell 10, which is higher than the conductive element 50 at the first connector 30, so as to identify the electrical connection area on the conductive element 50, which is beneficial for subsequent quality inspection.

[0041] Referring to Figure 4, in other embodiments, the battery string 100 may further include a second connector 70, which is connected to the second main grid electrode 61, and the first fine grid electrode 22 is spaced apart from the second connector 70. The second connector 70 may also be a pad structure for soldering metal solder strips or conductive lines corresponding to the second electrode 60.

[0042] In one embodiment of this application, the battery cell 10 is generally rectangular in shape, having adjacent and perpendicular first side 11 and second side 12, as shown in Figures 1 and 5. The dashed border in the figures is an example of the edge structure of the battery cell 10, and this application is not limited thereto. The battery cell 10 also includes a corner 13 formed between the first side 11 and the second side 12, which may be a chamfered structure between the first side 11 and the second side 12. A first connector 30 is disposed near the corner 13 so that the position of the first connector 30 corresponds to the extension end 51 of the conductive member 50.

[0043] In some embodiments, the battery string 100 may further include multiple connectors, which are spaced apart on the battery cell 10 and correspondingly connected to the first electrode 20 and the second electrode 60. The first connector 30 is the one closest to the corner 13 among the multiple connectors, meaning the distance between the first connector 30 and the corner 13 is smaller than the distance between the other connectors and the corner 13. The arrangement of multiple first connectors 30 and multiple second connectors 70 can increase the number of welding points for the conductive element 50 and improve connection reliability. In the embodiments of this application, the multiple second connectors 70 near the edge of the battery cell 10 all have the risk of burr puncture and short circuit, but the problem is more prominent for the second connectors 70 located at the corner 13 of the battery cell 10.

[0044] It is understood that multiple insulating elements 40 (as shown in Figure 6) can be provided between the main body of the conductive element 50 and the battery cell 10 to prevent the main body of the conductive element 50 from contacting electrodes of opposite polarity, thereby further reducing the risk of short circuit. The main body of the conductive element 50 is the part of the conductive element 50 excluding the extension end 51 and the welding area.

[0045] In some embodiments, as shown in Figures 1 to 5, the insulating member 40 covers a portion of the first fine gate electrode 22 and a portion of the second fine gate electrode 62. Thus, the insulating member 40 is a relatively large, monolithic structure that can simultaneously cover portions of multiple first fine gate electrodes 22 and multiple second fine gate electrodes 62, which simplifies the installation steps and reduces the difficulty of installing the insulating member 40, thereby improving manufacturing efficiency.

[0046] In other embodiments, as shown in FIG6, the insulating member 40 may also be provided as multiple insulating members 40, which are spaced apart along the first direction A, and each insulating member 40 covers a portion of the second fine gate electrode 62. In this way, the insulating member 40 can cover only the second fine gate electrode 62, reducing the amount of insulating member 40 used.

[0047] In some embodiments, as shown in Figures 1 to 8, the first connector 30 is disposed in the area where the fine grid electrodes are distributed. To avoid the second fine grid electrode 62 from contacting the first connector 30, the second fine grid electrode 62 is spaced a certain distance from the first connector 30 along the second direction B, resulting in a blank area around the first connector 30. Along the first direction A, the second fine grid electrode 62 adjacent to the first connector 30 has a bent end 63, which bends towards the first connector 30 and wraps around the end of the adjacent first fine grid electrode 22. The bent end 63 is generally a hook structure, and the bent end 63 is spaced apart from the first fine grid electrode 22 to avoid internal short circuits. Thus, the fine grid electrodes can fully collect the current on the battery cell 10 around the first connector 30, reducing the blank area on the battery cell 10.

[0048] Referring again to Figures 7 and 8, one embodiment of this application also provides a battery string 100, including a battery cell 10 and a conductive member 50. The battery cell 10 includes a plurality of first fine grid electrodes 22 and a first connector 30 on its first surface. The first connector 30 is disposed near the edge of the battery cell 10 and is electrically connected to at least one of the first fine grid electrodes 22. A first protrusion 31 is provided on the side of the first connector 30 and is connected to the first connector 30. The first protrusion 31 protrudes from the first connector 30 along a first direction A toward the edge of the battery cell 10. The conductive member 50 extends along the first direction A and connects to the first connector 30. The conductive member 50 has an extension end 51, which is the portion of the conductive member 50 extending out of the side of the first connector 30 near the edge of the battery cell 10, and the length of the extension end 51 along the first direction A is greater than the length of the first protrusion 31 along the first direction A.

[0049] The first protrusion 31 can isolate the conductive element 50 from the solar cell 10 during the welding process between the first connector 30 and the conductive element 50, preventing the fine grid electrode near the solder pad from breaking due to the high welding temperature, reducing the problem of damage to the solar cell 10 due to the high welding temperature, and helping to improve the assembly quality of the photovoltaic module. The first protrusion 31 can also be used to connect the first fine grid electrode 22 and the first connector 30, which can not only ensure the electrical connection between the first connector 30 and the first fine grid electrode 22, but also reduce the manufacturing precision requirements of the first connector 30.

[0050] In some embodiments, the solar cell 10 can be considered as a gridless (OBB) solar cell, where the first grid electrode 21 is not used as the direct electrical interconnection portion of the first connector 30, and the entire solar cell lacks a traditional grid structure. In other embodiments, the solar cell 10 can also be a solar cell with a grid structure, the structure of which is the same as in the aforementioned embodiments, and will not be described again here.

[0051] As shown in Figure 8, in some embodiments, the conductive element 50 extends beyond the side of the first connector 30 and covers the first protrusion 31. The provision of the first protrusion 31 can also increase the electrical contact area between the conductive element 50 and the first connector 30, thereby improving the connection reliability between the conductive element 50 and the first connector 30.

[0052] In one embodiment, the conductive element 50 is a flat strip structure with a width of 0.2mm-0.6mm along the second direction B. The width of the first protrusion 31 is less than or equal to the width of the conductive element 50, so that the conductive element 50 can fully cover the first protrusion 31 after being welded to the first connector 30. The first protrusion 31 does not expose the conductive element 50, which effectively isolates the conductive element 50 from the battery cell 10 while reducing the material usage of the first protrusion 31 and lowering manufacturing costs. By constraining the dimensions of the conductive element 50 and the first protrusion 31, the area covered by the battery cell 10 can be reduced while ensuring welding effect and electrical connection reliability.

[0053] In some embodiments, as shown in FIG8, the battery string 100 further includes an insulating member 40 disposed on one side of the first connector 30. The conductive member 50 has an extension end 51 extending beyond the side of the first connector 30, and the extension end 51 is at least partially disposed on the insulating member 40. The thickness of the insulating member 40 is h1, and the thickness of the conductive member 50 is h2, wherein h1 / h2 ≥ 10%. Further, the length of the first protrusion 31 is less than the length of the extension end 51 to reduce the risk of the first protrusion 31 contacting an electrode of opposite polarity. In the embodiments shown in FIG7 and FIG8, other configurations of the first connector 30, the first protrusion 31, the insulating member 40, the extension end 51, the fine grid electrode, etc., are generally the same as in the aforementioned embodiments and will not be described again here.

[0054] Embodiments of this application also provide a photovoltaic module, including multiple battery strings 100 as described in the above embodiments or combinations thereof, wherein the multiple battery strings 100 are connected in series or in parallel. Specifically, the conductive elements 50 in the multiple battery strings 100 can be connected accordingly to collect the current in the multiple battery strings 100.

[0055] The battery string 100 and photovoltaic module of this application use an insulating component 40 to isolate the extension end 51 of the conductive component 50 from the electrode structure, reducing the risk of the extension end 51 contacting electrodes of opposite polarity. Furthermore, by constraining the dimensional relationship between the thickness of the insulating component 40 and the conductive component 50, even if the conductive component 50 has burrs due to the manufacturing process, it ensures that the burrs cannot pierce the insulating component 40, further reducing the risk of short circuits and significantly improving the connection safety and success rate of the conductive component 50. Additionally, by providing a first protrusion 31 on the side of the first connector 30, the first protrusion 31 isolates the conductive component 50 from the battery cell 10 during the welding process between the first connector 30 and the conductive component 50, reducing the problem of damage to the battery cell 10 due to the high temperature of welding, which is beneficial to improving the assembly quality of the photovoltaic module.

[0056] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A battery string, characterized in that, include: A battery cell includes a first connector and a plurality of first fine grid electrodes on a first surface thereon; the first connector is disposed near the edge of the battery cell and is electrically connected to at least one of the first fine grid electrodes; a first protrusion is provided on the side of the first connector and is connected to the first connector, the first protrusion protruding from the first connector along a first direction toward the edge of the battery cell; A conductive element extends along the first direction and connects to the first connector, the conductive element having an extension end; the extension end is a portion of the conductive element extending out of the first connector near the side of the battery cell, and the length of the extension end along the first direction is greater than the length of the first protrusion along the first direction.

2. The battery string according to claim 1, characterized in that: The width of the conductive element is 0.2mm-0.6mm, and the width of the first protrusion is less than or equal to the width of the conductive element.

3. The battery string according to claim 1, characterized in that: The battery string further includes an insulating member disposed between the first connector and the edge of the battery cell; the battery cell further includes a plurality of second fine grid electrodes on its first surface, the first fine grid electrodes and the second fine grid electrodes having opposite polarities and being arranged alternately and spaced apart in sequence along a first direction; the insulating member at least covers a portion of one of the second fine grid electrodes; The extension end is at least partially disposed on the insulating member; the thickness of the insulating member is h1, and the thickness of the conductive member is h2, wherein h1 / h2≥10%.

4. The battery string according to claim 3, characterized in that: The extension end is away from the upper surface of the battery cell and is higher than the conductive element at the first connector.

5. The battery string according to claim 3, characterized in that: The thickness of the conductive element is 150μm-350μm; and / or, The thickness of the insulating component is 30μm-100μm.

6. The battery string according to claim 1, characterized in that: The first protrusion is electrically connected to at least one of the first fine gate electrodes via a connecting line.

7. The battery string according to claim 1, characterized in that: Along the second direction, at least two of the first protrusions are spaced apart, and the distance between adjacent first protrusions is less than the dimension of the conductive element along the second direction, which intersects the first direction.

8. The battery string according to claim 1, characterized in that: The battery cell includes corners, and the distance between the first connector and the corner is less than the distance between the other connectors and the corner.

9. The battery string according to claim 3, characterized in that: Along a first direction, the second fine gate electrode adjacent to the first connector has a bent end, which wraps around the end of the first fine gate electrode and is spaced apart from the first fine gate electrode.

10. A photovoltaic module, characterized in that, Includes the battery string according to any one of claims 1-9, wherein a plurality of said battery strings are connected in parallel or in series.

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