Battery strings and solar modules

Abstract

This application provides a battery string and a solar module. The battery string includes a battery cell and a conductive member. The battery cell includes a first connecting member and a plurality of first finger electrodes on its first surface, the first connecting member being located near the edge of the battery cell and electrically connected to at least one first finger electrode, the side of the first connecting member having a first projection connected to the first connecting member, the first projection projecting from the first connecting member toward the edge of the battery cell in a first direction. The conductive member extends in a first direction and is connected to the first connecting member. The conductive member has an extended end, which is the portion of the conductive member projecting from the side of the first connecting member near the battery cell, the length of the extended end in the first direction being greater than the length of the first projection in the first direction. The first projection isolates the conductive member from the battery cell, prevents the finger electrodes near the pad from fracturing due to welding high temperatures, and reduces the problem of the battery cell being damaged by welding high temperatures.

Description

Technical Field

[0001] This application relates to the technical field of photovoltaic power generation, and more specifically, to battery strings and solar modules.

Background Art

[0002] The electrodes of solar cells play an important role in collecting and transporting electrons. When assembling multiple solar cells to obtain a solar module, the electrodes of adjacent battery cells are often connected by ribbons. The electrodes of solar cells include busbars and fingers of different polarities, and the busbars or fingers of different polarities are provided at intervals alternately. When the ribbon is welded to the electrodes of adjacent battery cells, problems such as the end of the ribbon unexpectedly contacting the electrode of the opposite polarity and causing a short circuit are likely to occur, and during the welding process, the ribbon contacts the battery cell, and the fingers near the pad are likely to break due to the high welding temperature, resulting in low connection reliability of the ribbon and a decrease in the assembly quality of the solar module.

[0003] Improving the connection success rate of the ribbon and preventing the breakage of the fingers near the pad during the welding process are technical problems to be solved.

Summary of the Invention

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

[0005] An embodiment of the battery string provided in this application is realized as follows.

[0006] The battery string includes a battery cell, an insulating member, and a conductive member. The battery cell includes a plurality of first finger electrodes, a plurality of second finger electrodes, and a first connecting member on its first surface, wherein the first finger electrodes and the second finger electrodes have opposite polarity and are arranged alternately at intervals in a first direction, and the first connecting member is provided near the edge of the battery cell and is electrically connected to at least one first finger electrode. The insulating member is provided between the first connecting member and the edge of the battery cell and covers a portion of at least one second finger electrode. The conductive member extends in a first direction, is connected to the first connecting member, and has an extended end, which is the portion of the conductive member that protrudes from the side of the first connecting member near the edge of the battery cell, and the extended end is provided at least partially on the insulating member, where h1 is the thickness of the insulating member and h2 is the thickness of the conductive member, and h1 / h2 ≥ 10%. The battery string according to this application isolates the extended end of the conductive member from the electrode structure with an insulating member, reducing the risk of the extended end coming into contact with an electrode of opposite polarity. Furthermore, by limiting the size relationship between the thickness of the insulating member and the thickness of the conductive member, if burrs are generated on the conductive member during the manufacturing process, the burrs will not penetrate the insulating member, further reducing the risk of short circuits and significantly improving the connection safety and success rate of the conductive member.

[0007] Embodiments of this application further provide a battery string including a battery cell and a conductive member. The battery cell includes a first connecting member and a plurality of first finger electrodes on its first surface, the first connecting member being located near the edge of the battery cell and electrically connected to at least one of the first finger electrodes, the side of the first connecting member having a first projection connected to the first connecting member, the first projection projecting from the first connecting member toward the edge of the battery cell in a first direction. The conductive member extends in a first direction, is connected to the first connecting member, and has an extended end, the extended end being the portion of the conductive member projecting from the side of the first connecting member near the edge of the battery cell, the length of the extended end in the first direction being greater than the length of the first projection in the first direction. The first projection isolates the conductive member from the battery cell during the welding process of the first connecting member and the conductive member, reducing the problem of the battery cell being damaged by high welding temperatures and contributing to improved assembly quality of the solar module. Furthermore, the first protrusion may be used to connect the first finger electrode and the first connecting member, which not only ensures electrical connection between the first connecting member and the first finger electrode but also reduces the manufacturing precision requirements for the first connecting member. The provision of the first protrusion also increases the electrical contact area between the conductive member and the first connecting member, thereby improving the reliability of the connection between the conductive member and the first connecting member.

[0008] Embodiments of this application further provide a solar module comprising a plurality of battery strings as described in the above embodiment, wherein the plurality of battery strings are connected in parallel or in series. [Brief explanation of the drawing]

[0009] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings of the embodiments are briefly described below. The following drawings show only a portion of the embodiments of this application and should not be considered limiting. Those skilled in the art will be able to conceive of other relevant drawings based on these accompanying drawings without requiring any creative effort.

[0010] [Figure 1]This is a schematic diagram of a partial structure of a battery string according to the first embodiment of this application. [Figure 2] Figure 1 is a cross-sectional view of a partial structure of the battery string. [Figure 3] This is a cross-sectional view of a partial structure of the battery string in the second embodiment. [Figure 4] This is a schematic diagram of a partial structure of the battery string in the second embodiment. [Figure 5] This is a schematic diagram of a partial structure of the battery string in the third embodiment. [Figure 6] This is a schematic diagram of a partial structure of the battery string in the fourth embodiment. [Figure 7] This is a schematic diagram of a partial structure of the battery string in the fifth embodiment. [Figure 8] This is a schematic diagram of a partial structure of the battery string in the sixth embodiment.

[0011] Embodiments for carrying out the following inventions will be further described in this application with reference to the above drawings. [Modes for carrying out the invention]

[0012] The following describes the technical solutions in the embodiments of this application clearly and completely, with reference to the drawings of the embodiments. Naturally, the embodiments described are only a part of the embodiments of this application, not all of them.

[0013] It should be explained that when an element is described as being "fixed" to another element, it may be directly located on the other element or may have an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may have an intervening element. When an element is considered to be "provided" to another element, it may be directly provided to the other element or may have an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0014] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art. In this specification, terms used in the description of this application are solely for the purpose of describing specific embodiments and are not intended to limit this application. The terms “or / and” as used herein include any and all combinations of one or more related listed items.

[0015] Several embodiments of this application will be described in detail. Where there is no inconsistency, the embodiments and features described below can be combined with each other.

[0016] 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 schematic partial structure of the battery string 100, and Figure 2 is a cross-sectional view of the battery string 100 in the direction of extension of the conductive member 50. The battery cell 10 includes a first electrode 20, a second electrode 60, and a first connecting member 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 finger electrodes 22, and the second electrode 60 includes a plurality of second finger electrodes 62. The first finger electrodes 22 and the second finger electrodes 62 have opposite electrode polarities and are arranged alternately at intervals in a first direction A. The first connecting member 30 is provided near the edge of the battery cell 10 and is electrically connected to at least one first finger electrode 22. The insulating member 40 is provided between the first connecting member 30 and the edge of the battery cell 10 and covers a portion of at least one second finger electrode 62. The conductive member 50 extends in a first direction A and is connected to the first connecting member 30. The conductive member 50 has an extended end 51, which is the portion of the conductive member 50 that protrudes from the side edge of the first connecting member 30 near the edge of the battery cell 10, and the extended end 51 is at least partially provided on the insulating member 40. If the thickness of the insulating member 40 is h1 and the thickness of the conductive member 50 is h2, then h1 / h2 ≥ 10%.

[0017] In one embodiment of this application, the battery cell 10 in the battery string 100 may be a back-contact solar cell, and the first surface of the battery cell 10 being a non-light-receiving surface reduces shielding of the front surface of the battery cell 10 by electrodes, contributing to an improvement in the energy conversion efficiency of the battery cell 10. Similarly, structures such as insulating members 40 and conductive members 50 can be provided on the non-light-receiving surface of the battery cell 10. In other embodiments, the first surface of the battery cell 10 may be a light-receiving surface, as long as the design requirements are met, and this application is not limited thereto.

[0018] It was found that the thicker the conductive member 50, the longer the burrs become after cutting, increasing the risk of short circuits when electrically connected to the battery cell. For example, if the thickness of the conductive member is 350 micrometers, the length of the burrs after cutting is approximately 20 micrometers to 35 micrometers, and at least a portion of the burrs is pushed into the insulating member 40 during lamination, so the thickness of the insulating member must be 35 micrometers or more to ensure safety. If the thickness of the conductive member is 200 micrometers, the length of the burrs after cutting is approximately 10 micrometers to 20 micrometers, and at least a portion of the burrs is pushed into the insulating member 40 during lamination, so the thickness of the insulating member must be 20 micrometers or more to ensure safety. In the battery string 100 according to this application, the insulating member 40 isolates the extended end 51 of the conductive member 50 from the electrode structure, reducing the risk of the extended end 51 coming into contact with an electrode of opposite polarity. Furthermore, by limiting the size relationship between the thickness of the insulating member 40 and the thickness of the conductive member 50, if burrs are generated on the conductive member 50 during the manufacturing process, the burrs will not penetrate the insulating member 40, further reducing the risk of short circuits and significantly improving the connection safety and success rate of the conductive member 50.

[0019] In one embodiment of this application, the battery cell 10 can be considered a zero-busbar (i.e., 0BB) battery cell, which does not have a conventional busbar structure throughout the entire battery cell. In other embodiments, as shown in Figures 1 to 4, the battery cell 10 may be a battery cell having a conventional busbar structure. The first electrode 20 may further include a first busbar electrode 21, and the first finger electrode 22 is connected to the first busbar electrode 21. The second electrode 60 may further include a second busbar electrode 61, and the second finger electrode 62 is connected to the second busbar electrode 61. The first busbar electrode 21 and the second busbar electrode 61 are spaced parallel to each other along the second direction B, and the first direction A and the second direction B intersect. The second finger electrode 62 and the first connecting member 30 are spaced apart to avoid an internal short-circuit problem in the battery string 100 due to the electrical connection between the second finger electrode 62 and the first finger electrode 22.

[0020] In one embodiment, the number of first busbar electrodes 21 and second busbar electrodes 61 may be multiple. Multiple second busbar electrodes 61 and multiple first busbar electrodes 21 are arranged alternately at intervals in the second direction B, and multiple first finger electrodes 22 and multiple second finger electrodes 62 are arranged at intervals along the first direction A between the first busbar electrodes 21 and the second busbar electrodes 61.

[0021] In one embodiment of the present application, the first connection member 30 may be a pad structure provided on the surface of the battery cell 10, the conductive member 50 may be a metal ribbon, and the conductive member 50 and the first connection member 30 are welded and connected. The conductive member 50 in the form of a ribbon may achieve electrical connection with the first finger electrode 22 by covering one or more first finger electrodes 22. The insulating member 40 may be an insulating adhesive, but is not limited thereto. The extending end 51 is a strip-shaped region from the end of the conductive member 50 to the outer side of the first connection member 30 (the side close to the edge of the battery cell). The extending end 51 is laid on the upper surface of the insulating member 40, and the insulating member 40 isolates the extending end 51 of the conductive member 50 from the electrode to prevent a short-circuit problem. In the first direction A, the length of the insulating member 40 is greater than the length of the extending end 51. In the second direction B, the width of the insulating member 40 is greater than the width of the first connection member 30. Thus, even if the extending end 51 swings or is displaced during the mounting process, it is located within the surface area of the insulating member 40 and does not easily contact the electrode on the surface of the battery cell 10, further improving the safety of the battery string 100. In one embodiment, as shown in FIGS. 2 and 3, a bonding layer 32 is further provided on the upper surface of the first connection member 30. The bonding layer 32 has conductivity and can connect the first connection member 30 and the conductive member 50 during the welding process. Optionally, the material of the bonding layer 32 may be solder, a conductive adhesive, or low-temperature solder, etc.

[0022] In some embodiments, the thickness h2 of the conductive member 50 is 150 μm or more and 350 μm or less. The thickness h1 of the insulating member 40 is 30 μm or more and 100 μm or less. The greater the thickness of the insulating member 40, the higher the safety performance. The greater the thickness of the conductive member 50, the smaller the resistance. If the thicknesses of the insulating member 40 and the conductive member 50 are too large, it will affect the mounting effect and increase the cost of the product. The embodiments of the present application further limit the size ranges of the conductive member 50 and the insulating member 40 to reduce the resistance of the conductive member 50 while satisfying the connection safety and control the economic cost within an acceptable range.

[0023] In some embodiments, as shown in FIG. 2, the side located on the insulating member 40 of the extending end 51 has a protrusion 52 (thorn). The protrusion 52 is partially inserted into the insulating member 40, but in order to prevent the protrusion 52 from contacting the electrode of the opposite polarity below the insulating member 40 and causing a short circuit, the depth of the protrusion 52 inserted into the insulating member 40 is made smaller than the thickness of the insulating member 40. The protrusion 52 and the main body portion of the conductive member 50 have an integrally formed structure, and the protrusion 52 may be formed on the outer edge of the extending end 51 when the conductive member 50 is cut or sheared. When the conductive member 50 and the first connection member 30 are welded, the extending end 51 is positioned on the surface of the insulating member 40 by the protrusion 52, realizing a limitation on the degree of freedom of the extending end 51, and avoiding the unexpected contact of the extending end 51 with the electrode of the opposite polarity due to swinging.

[0024] The insulating member 40 is mainly used to cover the second finger electrode 62 that intersects the extending end 51, acts to isolate the extending end 51 and the second finger electrode 62, and achieves the effect of reducing short circuits.

[0025] In some embodiments, in the first direction A, on the side of the first connection member 30, a first protrusion 31 connected to the first connection member 30 is provided. The first protrusion 31 is electrically connected to at least one first finger electrode 22, and the first protrusion 31 and the second finger electrode 62 are provided at an interval. The conductive member 50 covers the first protrusion 31. When the conductive member 50 and the first connection member 30 are welded and connected, the first protrusion 31 isolates the battery cell 10 at the edge of the first connection member 30 from contacting the conductive member 50, protects the battery cell 10 from the welding heat, prevents the fingers near the pad from breaking, and can reduce 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 connection member 30 and the conductive member 50, and improve the connection reliability between the conductive member 50 and the first connection member 30.

[0026] In Figures 1 to 4, the first protrusion 31 is directly connected to the first connecting member 30, and the first protrusion 31 is directly electrically connected to the first finger electrode 22 of the same polarity that is closest to the first connecting member 30. However, in other embodiments, as shown in Figure 5, unlike in Figure 1, the first protrusion 31 is electrically connected to at least one of the first finger electrodes 22 by a single connecting wire 33. The number of first protrusions 31 may be one, two, or more. In the second direction B, for example, at least two first protrusions 31 are provided spaced apart, and the distance between adjacent first protrusions 31 is smaller than the size of the conductive member 50 in the second direction B, so that the conductive member 50 can cover multiple first protrusions 31. Each first protrusion 31 is connected to a single connecting wire 33. By replacing a large first protrusion 31 with a smaller first protrusion 31, the area occupied by a single first protrusion 31 on the battery cell 10 can be reduced, and different mounting requirements can be accommodated.

[0027] In one embodiment of this application, in the first direction A, the conductive member 50 protrudes from both opposing sides of the first connecting member 30, and two corresponding first protrusions 31 are also provided on both opposing sides of the first connecting member 30, contacting and supporting the portion of the conductive member 50 that protrudes from the side edge of the first connecting member 30. Furthermore, in the first direction A, one first finger electrode 22 is connected to each of the opposing sides of the first connecting member 30. If the first connecting member 30 is misaligned due to the manufacturing process, the first protrusions 31 ensure electrical connection between the first finger electrode 22 and the first connecting member 30, and prevent the first finger electrode 22 closest to the side edge of the first connecting member 30 from breaking.

[0028] In one embodiment of this application, in the first direction A, the length L1 of the first projection 31 is smaller than the distance between adjacent first finger electrodes 22 and second finger electrodes 62. Therefore, when the first projection 31 is connected to the first finger electrode 22, a gap is maintained between the first projection 31 and the second finger electrode 62, avoiding contact between the first projection 31 and the second finger electrode 62 and reducing the risk of internal short circuits in the battery string 100.

[0029] In some embodiments, as shown in Figures 1, 2, 5, and 6, in the first direction A, the length L1 of the first projection 31 may be greater than the distance between the insulating member 40 and the side of the first connecting member 30, and the insulating member 40 may cover a portion of the first projection 31. In this way, the insulating member 40 can adequately cover the second finger electrode 62 adjacent to the first connecting member 30, and the problem of the second finger electrode 62 being exposed below the extended end 51 due to variations in the manufacturing process can be reduced.

[0030] In other embodiments, as shown in Figures 3 and 4, the length L1 of the first protrusion 31 can be made smaller than the distance between the insulating member 40 and the side of the first connecting member 30, thereby providing a gap between the first protrusion 31 and the insulating member 40 and reducing the risk of the insulating member 40 being damaged by high temperatures during the welding process.

[0031] The extended end 51 of the conductive member 50 is essential during welding. The extended end 51 can be used to facilitate welding by allowing the indenter at the outermost edge to press against the end of the ribbon (i.e., the extended end 51) during string welding, ensuring a certain welding tolerance, and preventing welding defects due to vertical expansion and contraction of the conductive member 50. In some embodiments, the distance L2 that the extended end 51 protrudes from the side of the first connecting member 30 (excluding the first protrusion) is 2 mm or more and 5 mm or less. By limiting the size that the extended end 51 protrudes from the first connecting member 30, it is possible to avoid excessive freedom of movement due to the extended end 51 becoming too long and to reduce the problem of the extended end 51 separating from the insulating member 40 and causing a short circuit. Furthermore, as shown in Figures 1 and 2, in the first direction A, the extended end 51 intersects with at least two second finger electrodes 62. In this way, the size of the extended end 51 can be controlled within a reasonable range, reducing the problem of the pressing tool being unable to press the extended end 51 during the welding process due to the length of the extended end 51 being too small, thereby contributing to an improvement in welding yield.

[0032] As shown in Figures 2 and 3, in some embodiments, the upper surface of the extended end 51 opposite to the battery cell 10 is made higher than the upper surface of the first connecting member 30 of the conductive member 50 opposite to the battery cell 10, which makes it easier to recognize the electrical connection area of ​​the conductive member 50 and contributes to subsequent quality inspection.

[0033] Referring to Figure 4, in another embodiment, the battery string 100 may further include a second connecting member 70 connected to the second busbar electrode 61, with a gap between the first finger electrode 22 and the second connecting member 70. The second connecting member 70 may also be a pad structure for welding a metal ribbon or conductive wire corresponding to the second electrode 60.

[0034] In one embodiment of this application, as shown in Figures 1 and 5, the battery cell 10 has a substantially rectangular structure, and the rectangular battery cell 10 has adjacent and perpendicular first side 11 and second side 12. The dashed frame 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 further includes a corner 13. The corner 13 is formed between the first side 11 and the second side 12 and may be a chamfered structure between the first side 11 and the second side 12. The first connecting member 30 is positioned close to the corner 13 so as to correspond its position to the extended end 51 of the conductive member 50.

[0035] In some embodiments, the battery string 100 may further include a plurality of connecting members distributed at intervals on the battery cell 10 and correspondingly connected to the first electrode 20 and the second electrode 60. The first connecting member 30 is the one closest to the corner 13 among the plurality of connecting members, i.e., the distance between the first connecting member 30 and the corner 13 is smaller than the distance between the other connecting members and the corner 13. By providing a plurality of first connecting members 30 and a plurality of second connecting members 70, the number of welding points of the conductive member 50 can be increased and connection reliability can be improved. In the embodiments of this application, the plurality of second connecting members 70 near the edge of the battery cell 10 all have a risk of burrs penetrating and causing a short circuit, but this problem is more serious for the second connecting member 70 at the corner 13 of the battery cell 10.

[0036] It is understandable that multiple insulating members 40 (shown in Figure 6) may be provided between the main body of the conductive member 50 and the battery cell 10 to avoid contact between the main body of the conductive member 50 and electrodes of opposite polarity, and to further reduce the risk of short circuits. The main body of the conductive member 50 is the portion of the conductive member 50 other than the extended end 51 and the welded area.

[0037] In some embodiments, as shown in Figures 1 to 5, the insulating member 40 covers a portion of the first finger electrode 22 and a portion of the second finger electrode 62. Thus, the insulating member 40 has a relatively large single-wafer structure and can simultaneously cover a portion of multiple first finger electrodes 22 and multiple second finger electrodes 62, contributing to the simplification of the installation steps and difficulty of installation of the insulating member 40, and improving manufacturing efficiency.

[0038] In other embodiments, as shown in Figure 6, multiple insulating members 40 may be provided. The multiple insulating members 40 are provided at intervals in the first direction A, and each insulating member 40 covers a portion of the second finger electrode 62. In this way, the insulating members 40 cover only the second finger electrode 62, and the amount of insulating member 40 used can be reduced.

[0039] In some embodiments, as shown in Figures 1 to 8, the first connecting member 30 is provided in the region where the finger electrodes are distributed. In the second direction B, the second finger electrode 62 is spaced a certain distance from the first connecting member 30 so that it does not come into contact with the first connecting member 30, thereby creating a gap around the first connecting member 30. In the first direction A, the second finger electrode 62 adjacent to the first connecting member 30 has a bent end 63, which is bent toward the first connecting member 30 and surrounds the end of the adjacent first finger electrode 22. The bent end 63 has a substantially hook structure and is provided at a distance from the first finger electrode 22 to avoid internal short circuits. In this way, the finger electrodes can sufficiently collect current in the battery cell 10 around the first connecting member 30 and reduce the gap in the battery cell 10.

[0040] Referring again to Figures 7 and 8, one embodiment of the present application further provides a battery string 100 including a battery cell 10 and a conductive member 50. The battery cell 10 includes a plurality of first finger electrodes 22 on its first surface and a first connecting member 30. The first connecting member 30 is provided near the edge of the battery cell 10 and is electrically connected to at least one of the first finger electrodes 22. A first projection 31 is provided on the side of the first connecting member 30 and is connected to the first connecting member 30, the first projection 31 protruding from the first connecting member 30 toward the edge of the battery cell 10 in a first direction A. The conductive member 50 extends in the first direction A and is connected to the first connecting member 30. The conductive member 50 has an extended end 51, which is the portion of the conductive member 50 that protrudes from the side edge of the first connecting component 30 near the edge of the battery cell 10, and the length of the extended end 51 in the first direction A is greater than the length of the first protruding portion 31 in the first direction A.

[0041] The first protrusion 31 isolates the conductive member 50 from the battery cell 10 during the welding process of the first connecting member 30 and the conductive member 50, preventing the finger electrodes near the pad from fracturing due to the high welding temperature, thereby reducing the problem of the battery cell 10 being damaged by the high welding temperature, and contributing to an improvement in the assembly quality of the solar module. The first protrusion 31 may also be used to connect the first finger electrode 22 and the first connecting member 30, which not only ensures electrical connection between the first connecting member 30 and the first finger electrode 22 but also lowers the manufacturing precision requirements for the first connecting member 30.

[0042] In some embodiments, the battery cell 10 can be considered a zero-busbar (i.e., 0BB) battery cell, which lacks a conventional busbar structure throughout the entire battery cell, and its first busbar electrode 21 is not used as a direct electrical interconnection part of the first connecting member 30. In other embodiments, the battery cell 10 may be a battery cell having a busbar structure, and its structure is the same as in the above embodiments, so it will not be described again here.

[0043] As shown in Figure 8, in some embodiments, the conductive member 50 protrudes from the side of the first connecting member 30 and covers the first protrusion 31. The provision of the first protrusion 31 can increase the electrical contact area between the conductive member 50 and the first connecting member 30, thereby improving the reliability of the connection between the conductive member 50 and the first connecting member 30.

[0044] In one embodiment, the conductive member 50 has a flat, strip-like structure, and in the second direction B, the width of the conductive member 50 is 0.2 mm or more and 0.6 mm or less, and the width of the first protrusion 31 is less than or equal to the width of the conductive member 50, so that the conductive member 50 can sufficiently cover the first protrusion 31 after it has been welded to the first connecting member 30. By preventing the first protrusion 31 from being exposed from the conductive member 50, the conductive member 50 and the battery cell 10 are effectively isolated, and the amount of material used for the first protrusion 31 can be reduced, thereby reducing manufacturing costs. By limiting the size of the conductive member 50 and the first protrusion 31, the coverage relative to the area of ​​the battery cell 10 can be reduced while ensuring welding effectiveness and electrical connection reliability.

[0045] In some embodiments, as shown in Figure 8, the battery string 100 further includes an insulating member 40 provided on one side of the first connecting member 30. The conductive member 50 has an extended end 51, which protrudes from the side of the first connecting member 30 and is at least partially provided on the insulating member 40. If the thickness of the insulating member 40 is h1 and the thickness of the conductive member 50 is h2, then h1 / h2 ≥ 10%. Furthermore, to reduce the risk of the first protrusion 31 coming into contact with an electrode of opposite polarity, the length of the first protrusion 31 is made smaller than the length of the extended end 51. In the embodiments shown in Figures 7 and 8, the first connecting member 30, the first protrusion 31, the insulating member 40, the extended end 51, and other mounting structures such as finger electrodes are substantially the same as in the embodiments described above and will not be repeated here.

[0046] Embodiments of this application further provide a solar module comprising a plurality of battery strings 100 described in the above embodiment or a combination thereof, wherein the plurality of battery strings 100 are connected in series or in parallel. Specifically, in order to collect the current in the plurality of battery strings 100, the conductive members 50 in the plurality of battery strings 100 can be connected in correspondence.

[0047] The battery string 100 and solar module according to this application isolate the extended end 51 of the conductive member 50 from the electrode structure by insulating member 40, reducing the risk of the extended end 51 coming into contact with an electrode of opposite polarity. Furthermore, by limiting the size relationship between the thickness of insulating member 40 and the thickness of conductive member 50, if burrs are generated on the conductive member 50 during the manufacturing process, the burrs will not penetrate the insulating member 40, further reducing the risk of short circuits and significantly improving the connection safety and success rate of the conductive member 50. In addition, by providing a first protrusion 31 on the side of the first connecting member 30, the first protrusion 31 isolates the conductive member 50 from the battery cell 10 during the welding process of the first connecting member 30 and the conductive member 50, reducing the problem of the battery cell 10 being damaged by high welding temperatures and contributing to improved assembly quality of the solar module.

[0048] The embodiments described above are for illustrative purposes only and do not limit the technical solutions of this application. Although this application has been described in detail with reference to the preferred embodiments described above, those skilled in the art should understand that the technical solutions of this application can be modified or replaced with equivalent substitutes without departing from the spirit and scope of the technical solutions of this application. [Explanation of Symbols]

[0049] 100 Battery String 10 battery cells 11 First side 12 Second side 13 corners 20 1st electrode 21 First busbar electrode 22 First finger electrode 30 First connecting member 31 1st protrusion 32 Bonding layer 33 connecting lines 40 Insulating material 50 Conductive members 51 Extended end 52 Protrusion 60 2nd electrode 61 Second busbar electrode 62 Second finger electrode 63 Folded end 70 Second connecting member A 1st direction B Second direction

Claims

1. A battery cell comprising a first connecting member and a plurality of first finger electrodes on its first surface, wherein the first connecting member is provided near the edge of the battery cell and is electrically connected to at least one first finger electrode, and a first projection is provided on the side of the first connecting member that is connected to the first connecting member, and the first projection protrudes from the first connecting member toward the edge of the battery cell in a first direction, A conductive member extending in the first direction and connected to the first connecting member, wherein the conductive member has an extended end, the extended end being a portion of the conductive member that protrudes from the side of the first connecting member near the battery cell, and the length of the extended end in the first direction is greater than the length of the first protrusion in the first direction. A battery string characterized by containing [something].

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

3. The battery string further includes an insulating member provided between the first connecting member and the edge of the battery cell, the battery cell further includes a plurality of second finger electrodes on its first surface, the first finger electrodes and the second finger electrodes have opposite polarities and are arranged alternately at intervals in a first direction, and the insulating member covers a portion of at least one of the second finger electrodes. The extended end is provided at least partially on the insulating member, and if the thickness of the insulating member is h1 and the thickness of the conductive member is h2, then h1 / h2 ≥ 10%. The battery string according to claim 1, characterized in that

4. The upper surface of the extended end opposite to the battery cell is higher than the upper surface of the first connecting member of the conductive member opposite to the battery cell. The battery string according to claim 3, characterized in that

5. The thickness of the conductive member is 150 μm or more and / or 350 μm or less. The thickness of the insulating member is 30 μm or more and 100 μm or less. The battery string according to claim 3, characterized in that

6. The first protrusion is electrically connected to at least one of the first finger electrodes by a single connecting wire. The battery string according to claim 1, characterized in that

7. In the second direction, at least two of the first protrusions are spaced apart, the distance between adjacent first protrusions is smaller than the size of the conductive member in the second direction, and the second direction intersects the first direction. The battery string according to claim 1, characterized in that

8. The battery cell includes a corner, and the distance between the first connecting member and the corner is smaller than the distance between other connecting members and the corner. The battery string according to claim 1, characterized in that

9. In the first direction, the second finger electrode adjacent to the first connecting member has a bent end, which surrounds one of the ends of the first finger electrode and is provided at a distance from the first finger electrode. The battery string according to claim 3, characterized in that

10. A solar module comprising a battery string according to any one of claims 1 to 9, wherein a plurality of the battery strings are connected in parallel or in series.

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