Battery cover plate and square shell battery

Abstract

The utility model relates to the technical field of square-shell batteries, in particular to a battery cover plate and a square-shell battery, the battery cover plate is applied to the square-shell battery, the battery cover plate comprises a plurality of lower plastics, the plurality of lower plastics are sequentially arranged along a preset direction, and any two adjacent lower plastics are assembled together. Therefore, a thin and long integrated lower plastic in the prior art is replaced by a structure formed by assembling a plurality of lower plastics with shorter lengths, so that the problems of deformation and the like cannot occur when the short lower plastics are produced by injection molding, the yield is further improved, the mold opening cost is also greatly reduced, the production cost is reduced, and the production efficiency is improved. And the connecting piece is redesigned, so that original ultrasonic welding can be replaced by laser welding, risks such as pseudo soldering caused by ultrasonic welding are avoided, the structure is more reliable, reworking is not needed, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of square shell batteries, and in particular to a battery cover and a square shell battery. Background Art

[0002] At present, lithium-ion batteries, which account for a large share of the market, can be divided into three types according to their appearance: cylindrical batteries, soft-pack batteries, and square aluminum shell batteries, also known as square shell batteries. Due to the advantages of square aluminum shell batteries such as large capacity and simple assembly, they currently occupy a dominant position in the energy storage and power battery markets. However, in the current large-capacity square aluminum shell battery structure, the lower plastic of the battery cover is generally slender, and generally after injection molding, it will experience large deformation, resulting in a significant reduction in the yield of the product and a significant increase in the cost of mold design. Utility Model Content

[0003] The purpose of the present application is to provide a battery cover and a square shell battery, which to a certain extent solves the technical problems existing in the prior art that the lower plastic of the battery cover in the large-capacity square aluminum shell battery structure is generally slender, and generally after injection molding, it will be greatly deformed, resulting in a significant reduction in the yield of the product and a significant increase in the cost of mold design.

[0004] The present application provides a battery cover plate, which is applied to a square shell battery. The battery cover plate includes: a plurality of lower plastics, and the plurality of lower plastics are arranged in sequence along a preset direction, wherein any two adjacent lower plastics are assembled together.

[0005] In the above technical solution, further, any two adjacent lower plastics are detachably connected.

[0006] In any of the above technical solutions, further, any two adjacent lower plastics are detachably connected by snap-fitting.

[0007] In any of the above technical solutions, further, when any two adjacent lower plastics are connected by snapping, one of the two adjacent lower plastics is provided with a snap portion, the other of the two adjacent lower plastics is provided with a snap hole, and the snap portion is snapped into the snap hole.

[0008] In any of the above technical solutions, further, the battery cover plate also includes a bus bar, and the bus bar is installed on the lower surface of at least one of the plurality of lower plastics.

[0009] In any of the above technical solutions, further, the busbar is formed with a first positioning portion, the lower plastic assembled with the busbar is formed with a second positioning portion, and the first positioning portion and the second positioning portion cooperate with each other for positioning.

[0010] In any of the above technical solutions, further, the busbar includes a mounting portion and a connecting portion connected to each other, and the connecting portion and the mounting portion are bent; the mounting portion is installed on the corresponding lower surface of the lower plastic, and the connecting portion is used to extend to the side of the pole ear cluster of the pole group of the square shell battery arranged along its height direction, and is laser welded with the pole ear cluster, wherein the pole ear cluster includes a plurality of pole ears arranged in parallel.

[0011] In any of the above technical solutions, further, the battery cover plate also includes a cover sheet and a pole; wherein the plurality of lower plastics are arranged on one side of the cover sheet close to the pole group of the square shell battery;

[0012] The cover plate is formed with a first mounting through hole, and the lower plastic located below the first mounting through hole is formed with a second mounting through hole, the pole is sequentially passed through the first mounting through hole and the second mounting through hole, and both ends of the pole along its height direction extend to the outside of the cover plate and the lower plastic respectively; the pole abuts against the mounting portion of the busbar and is connected by laser welding.

[0013] In any of the above technical solutions, further, a nano-ceramic coating is provided on one side of the lower plastic close to the pole group and around the outer periphery of the second mounting through hole.

[0014] In any of the above technical solutions, further, a limiting groove is provided on one side of the lower plastic close to the pole group, a limiting portion is formed on one end of the pole close to the pole group, and the limiting portion is provided in the limiting groove.

[0015] In any of the above technical solutions, further, the mounting portion is parallel to the lower surface of the lower plastic, and the connecting portion is arranged perpendicular to the mounting portion.

[0016] In any of the above technical solutions, further, the number of the connecting parts is two, and they are respectively arranged on two opposite sides of the mounting part to form a U-shaped structure.

[0017] The present application also provides a square shell battery, including the battery cover described in any of the above technical solutions, and thus has all the beneficial technical effects of the battery cover, which will not be repeated here.

[0018] In the above technical solution, further, the square shell battery also includes a shell and a pole group; wherein the shell is a structure that is hollow inside and has an opening formed at at least one end along its height direction, the pole group is arranged in the shell, and the battery cover is sealed at the opening of the shell;

[0019] A pole lug cluster is formed at at least one end of the pole group along the height direction thereof. The pole lug cluster extends along the height direction of the pole group, and the pole lug cluster is connected to the busbar by laser welding.

[0020] In any of the above technical solutions, further, the square shell battery also includes an insulating sheet, and the insulating sheet is wrapped around the outside of the electrode group, so that one end of the electrode group that cooperates with the bus bar is exposed.

[0021] Compared with the prior art, the beneficial effects of this application are:

[0022] The battery cover provided in the present application replaces the slender integrated lower plastic in the prior art with a structure in which multiple shorter lower plastics are assembled together, so that deformation and other problems will not occur during the injection molding of the short lower plastic, thereby improving the yield rate and greatly reducing the mold opening cost, which helps to reduce production costs.

[0023] In addition, the connecting piece has been redesigned, so that laser welding can be used instead of the original ultrasonic welding, thus avoiding the risks of cold welds caused by ultrasonic welding. The structure is more reliable and there is no need for rework, which greatly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 An exploded view of a square shell battery provided in an embodiment of the present application;

[0026] Figure 2 An assembly diagram of two lower plastics provided in an embodiment of the present application;

[0027] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A;

[0028] Figure 4 A schematic diagram of the structure of the lower plastic provided in an embodiment of the present application;

[0029] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at B;

[0030] Figure 6 Another assembly diagram of two lower plastics provided in an embodiment of the present application;

[0031] Figure 7 An assembly diagram of the lower plastic and the busbar provided in an embodiment of the present application;

[0032] Figure 8 A schematic diagram of the structure of a bus provided in an embodiment of the present application;

[0033] Fig. 9 An assembly diagram of a pole lug cluster and a busbar of a pole group provided in an embodiment of the present application;

[0034] Fig.10 for Fig. 9 A schematic diagram of the enlarged structure at C;

[0035] Fig.11 A schematic diagram of the structure of the electrode group provided in the embodiment of the present application;

[0036] Fig.12 A schematic diagram of the structure of a battery cover provided in an embodiment of the present application;

[0037] Fig.13 for Fig.12 Cross-sectional view along section DD;

[0038] Fig.14 for Fig.13 A schematic diagram of the enlarged structure at E;

[0039] Fig.15 A schematic diagram of the structure of a battery cover provided in an embodiment of the present application;

[0040] Fig.16 Another schematic diagram of the structure of the battery cover provided in the embodiment of the present application;

[0041] Fig.17 A schematic diagram of the structure of a square shell battery provided in an embodiment of the present application.

[0042] Reference numerals:

[0043] 10-battery cover, 1-lower plastic, 11-buckle part, 12-clamping hole, 13-second positioning part, 14-limiting groove, 15-second mounting through hole, 2-bus, 21-first bus, 22-second bus, 23-mounting part, 24-connecting part, 25-first positioning part, 3-cover, 4-pole, 41-positive pole, 42-negative pole, 43-limiting part, 5-nano ceramic coating, 6-upper plastic, 7-sealing ring, 20-shell, 30-pole group, 301-pole ear cluster, 3011-positive pole ear cluster, 3012-negative pole ear cluster, 40-insulating sheet. DETAILED DESCRIPTION

[0044] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0045] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0046] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0047] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present 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 understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0048] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] Refer to the following Figures 1 to 17 The battery cover and square shell battery according to some embodiments of the present application are described.

[0050] Embodiment 1

[0051] See also Figure 1 and Figure 2 As shown, an embodiment of the present application provides a battery cover 10, which is applied to square shell batteries. The battery cover 10 includes: a plurality of lower plastics 1, and the plurality of lower plastics 1 are arranged sequentially along a preset direction, wherein any two adjacent lower plastics 1 are assembled together.

[0052] According to the structure described above, the slender integrated lower plastic in the prior art is replaced with a structure in which multiple shorter lower plastics 1 are assembled together, so that deformation and other problems will not occur during the injection molding of the short lower plastic 1, thereby improving the yield rate and greatly reducing the mold opening cost, which helps to reduce production costs.

[0053] In this embodiment, preferably, Figure 2 and Figure 3 As shown, any two adjacent lower plastics 1 are detachably connected by snap-fitting, which is a common detachable connection method. It is convenient to install and disassemble and is more convenient to assemble.

[0054] Further, preferably, Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, when any two adjacent lower plastics 1 are connected by snapping, one of the two adjacent lower plastics 1 is provided with a snap portion 11, and the other of the two adjacent lower plastics 1 is provided with a snap hole 12, and the snap portion 11 is snapped into the snap hole 12.

[0055] It should be noted that the connection method of any two adjacent lower plastics 1 is not limited to the above-mentioned clamping, and can also be connected by fastening components such as bolts or screws, or by gluing, etc., which is specifically designed according to actual needs.

[0056] In this embodiment, preferably, Figure 1 and Figure 7 As shown, the battery cover 10 further includes a bus bar 2 , and the bus bar 2 is installed on the lower surface of at least one lower plastic 1 among the plurality of lower plastics 1 .

[0057] According to the structure described above, the busbar 2 is integrated on the lower surface of the lower plastic 1 to facilitate connection with the tab cluster 301 of the electrode group 30 below, thus playing a role of switching.

[0058] In this embodiment, preferably, Figures 6 to 8 As shown, the busbar 2 is formed with a first positioning portion 25 , and the lower plastic 1 assembled with the busbar 2 is formed with a second positioning portion 13 , and the first positioning portion 25 and the second positioning portion 13 are matched and positioned.

[0059] According to the structure described above, the first positioning portion 25 and the second positioning portion 13 are assembled together to position the busbar 2 .

[0060] Further, preferably, the first positioning portion 25 is a positioning hole, that is, the bus 2 is provided with a positioning hole; the second positioning portion 13 is a positioning protrusion, that is, a positioning protrusion is formed on the lower surface of the lower plastic 1, and the positioning protrusion is inserted into the positioning hole, thereby playing a role in assembly positioning. Of course, it is not limited to this, the first positioning portion 25 can also be a positioning protrusion, and the second positioning portion 13 can also be a positioning hole, which is specifically designed according to actual needs.

[0061] In this embodiment, preferably, Figures 8 to 11 As shown, the bus 2 includes a mounting portion 23 and a connecting portion 24 connected to each other, and the connecting portion 24 and the mounting portion 23 are bent; the mounting portion 23 is installed on the lower surface of the corresponding lower plastic 1, and the connecting portion 24 is used to extend to the side of the pole lug cluster 301 of the pole group 30 of the square shell battery that is arranged along its height direction, and is laser welded with the pole lug cluster 301, that is, the pole lug cluster 301 extends along the height direction of the pole group 30, and the connecting portion 24 can extend to the large surface side of the pole lug cluster 301 (the large surface here refers to the surface formed by the long side and the high side), and can be connected to the pole lug cluster 301 by laser welding.

[0062] Further, preferably, Figures 12 to 15 As shown, the battery cover 10 also includes a cover sheet 3 and a pole 4; wherein a plurality of lower plastics 1 are arranged on one side of the cover sheet 3 close to the pole group 30 of the square shell battery;

[0063] The cover plate 3 is formed with a first mounting through hole, and the lower plastic 1 located below the first mounting through hole is formed with a second mounting through hole 15, the pole 4 is sequentially inserted into the first mounting through hole and the second mounting through hole 15, and both ends of the pole 4 along its height direction extend to the outside of the cover plate 3 and the lower plastic 1 respectively; the pole 4 abuts against the mounting portion 23 of the bus 2 and is connected by laser welding.

[0064] According to the structure described above, the present application adopts a bent bus 2 to replace the structure of the multi-layer folded and compressed connecting plate in the prior art, so that the mounting portion 23 of the bus 2 directly abuts against the lower surface of the lower end of the pole 4, and the thickness is relatively thin, so that laser welding can be directly adopted, and the bent connecting portion 24 is extended to the side of the vertically placed pole ear cluster 301, and the two abut against each other, and the thickness is relatively thin, so that laser welding can be directly adopted.

[0065] It can be seen that the busbar 2 of the present application has a simple structure, and can be directly fitted with the pole 4 and the pole ear cluster 301 of the pole group 30 respectively. It is relatively thin, and laser welding can be used. There is no need for a thicker connecting sheet that is folded and compressed together in multiple layers like in the existing pole 4, which can only be welded to the pole and the flattened pole ear cluster 301 by ultrasonic welding (it should be noted that the connecting sheet is a long thin sheet, which is repeatedly folded to eventually form a multi-layer folded structure), which can effectively avoid the problem of cold welding caused by ultrasonic welding, thereby improving the yield rate, and there is no need for rework and soldering, thereby greatly improving the production efficiency. In addition, the pole ear cluster 301 does not need to be flattened, which reduces the process steps and also helps to improve production efficiency.

[0066] Further, preferably, Fig.10 As shown, the mounting portion 23 is parallel to the lower surface of the lower plastic 1 , and the connecting portion 24 is vertically arranged to the mounting portion 23 . The shape is regular, which is convenient for processing and manufacturing as well as welding and assembly with the pole 4 and the pole ear cluster 301 .

[0067] Further, preferably, Figure 8 As shown, there are two connecting parts 24, which are respectively arranged on the opposite sides of the mounting part 23 to form a U-shaped structure. The opening of the U-shaped structure can face the pole group 30 side. The two sides of the U-shaped structure, that is, the two connecting parts 24, can play a role of stable support, and can be assembled and welded with the two sides of the extended pole ear cluster 301 respectively, thereby increasing the welding position and area, which helps to improve the welding effect.

[0068] Of course, the structure of the bus 2 is not limited to the above. For example, the bus 2 may include only one mounting portion 23 and one connecting portion 24, that is, the bus 2 has an L-shaped structure, or the bus 2 includes one mounting portion 23 and more than two connecting portions 24, such as three connecting portions 24 or four connecting portions 24, etc., and the specific design is based on actual needs.

[0069] Further, preferably, the busbar 2 is an integrated structure and can be formed by bending or the like, but is not limited thereto.

[0070] In this embodiment, preferably, Figure 6 As shown, a nano ceramic coating 5 is provided on one side of the lower plastic 1 close to the pole group 30 and around the outer periphery of the second mounting through hole 15 .

[0071] According to the structure described above, nano-ceramic spraying can greatly improve the high temperature resistance of the local position of the lower plastic 1, thereby solving the problem of reduced insulation performance caused by the melting of the lower plastic during the high temperature laser welding of the pole.

[0072] In this embodiment, preferably, Figure 6 , Fig.14 and Fig.16 As shown, a limiting groove 14 is provided on one side of the lower plastic 1 close to the pole group 30 , and a limiting portion 43 is formed on one end of the pole 4 close to the pole group 30 , and the limiting portion 43 is disposed in the limiting groove 14 .

[0073] According to the structure described above, it can be known that the limiting groove 14 is used to limit the limiting portion 43, so that the pole 4 and the lower plastic 1 are assembled more stably.

[0074] Further, preferably, the aforementioned nano-ceramic spraying is provided on the inner wall of the limiting groove 14 .

[0075] In this embodiment, preferably, Fig.13 and Fig.15 As shown, the battery cover 10 includes two poles 4 which are arranged at intervals, one of which is a positive pole 41 and the other is a negative pole 42. Of course, this is not limited to the above, and the number of poles 4 can also be one, such as a positive pole 41 or a negative pole 42, which is designed according to actual needs.

[0076] In this embodiment, preferably, Fig.15 and Fig.16 As shown, the number of lower plastics 1 is two, one of which is provided with a positive electrode column 41, and the other lower plastic 1 is provided with a negative electrode column 42. Of course, it is not limited to this, and the number of lower plastics 1 can be more than two, such as three, four, five, etc. In this case, when the number of poles 4 included in the battery cover 10 is one, it can be arranged on one of the lower plastics 1 according to actual needs. When the number of poles 4 included in the battery cover 10 is two, it can be arranged on two of the lower plastics 1 that correspond to each other according to actual needs.

[0077] It should be noted that: Fig.14 and Fig.15 As shown, the battery cover 10 also includes an upper plastic 6 and a sealing ring 7. The upper plastic 6 is designed between the cover 3 and the pole 4 to play an insulating role. The sealing ring 7 is sleeved on the pole 4 and is located between the first mounting through hole of the cover 3 and the pole 4 to play an insulating and sealing role. This part is the prior art and will not be described in detail here.

[0078] Embodiment 2

[0079] See also Figure 1 and Fig.17 As shown, the second embodiment of the present application also provides a square shell battery, including the battery cover 10 described in the above-mentioned first embodiment, and thus has all the beneficial technical effects of the battery cover 10, and the same technical features and beneficial effects are no longer repeated.

[0080] In this embodiment, preferably, Figure 1 , Figures 9 to 11 , Fig.17 As shown, the square shell battery also includes a shell 20 and an electrode group 30; wherein the shell 20 is a structure that is hollow inside and has an opening formed at the top along its height direction, the electrode group 30 is arranged in the shell 20, and the shell 20 is equipped with a battery cover 10, and the battery cover 10 is sealed at the opening of the shell 20;

[0081] The top of the electrode group 30 along the height direction thereof is formed with an electrode tab cluster 301, namely, a positive electrode tab cluster 3011 and a negative electrode tab cluster 3012 arranged at intervals, and both the positive electrode tab cluster 3011 and the negative electrode tab cluster 3012 extend along the height direction of the electrode group 30;

[0082] Each of the positive electrode ear cluster 3011 and the negative electrode ear cluster 3012 is equipped with a bus bar 2. The positive electrode ear cluster 3011 is connected to the corresponding bus bar 2, i.e., the first bus bar 21, by laser welding, and the negative electrode ear cluster 3012 is connected to the corresponding bus bar 2, i.e., the second bus bar 22, by laser welding.

[0083] The first busbar 21 and the second busbar 22 are each equipped with a pole 4 , that is, the first busbar 21 is equipped with a positive pole 41 , and the second busbar 22 is equipped with a negative pole 42 , which are responsible for the total positive and total negative outputs respectively.

[0084] According to the structure described above, it can be known that the busbar 2 of the present application has a simple structure, is directly fitted with the pole 4 and the pole ear cluster 301 of the pole group 30, has a relatively thin thickness, and can be laser welded. There is no need for a thicker connecting piece that is folded and compressed together in multiple layers like in the existing pole 4, which can only be welded with the pole 4 and the flattened pole ear cluster 301 by ultrasonic welding, thereby avoiding the problem of cold welding caused by ultrasonic welding, thereby improving the yield rate, and there is no need for rework and repair welding, thereby greatly improving the production efficiency, and ensuring the structural reliability and stability during the manufacturing process of large-capacity square shell batteries.

[0085] In combination with the above, it can be seen that the connection methods of the positive electrode ear cluster 3011 and the negative electrode ear cluster 3012 with the corresponding pole 4 are the same, which is easy to be realized by automated equipment.

[0086] Furthermore, preferably, the square shell battery also includes an insulating sheet 40, and the insulating sheet 40 is wrapped around the outside of the electrode group 30, and the end of the electrode group 30 that cooperates with the bus 2 is exposed. The insulating sheet 40 is used to wrap the electrode group 30 to prevent the electrode group 30 from contacting the shell 20 and causing the risk of internal short circuit.

[0087] It should be noted that the structure of the square shell battery is not limited to the above, and is not limited to the structure in which the total positive and total negative are led out at the same end. They can also be led out from both ends. For example, both ends of the shell 20 along its height direction are provided with openings, and each opening is equipped with a battery cover 10, and each battery cover 10 includes a pole 4, wherein the pole 4 on one battery cover 10 is a positive pole 41, wherein the pole 4 on the other battery cover 10 is a negative pole 42, or the shell 20 along its height direction is provided with an opening. An opening is provided at the top in the degree direction, and the opening is equipped with a battery cover 10. The battery cover 10 includes a pole 4, such as a positive pole 41. A positive pole ear cluster 3011 is provided at the top of the pole group 30, and the positive pole ear cluster 3011 is electrically connected to the positive pole 41 through a bus 2, and the negative pole ear cluster 3012 at the bottom of the pole group 30 can be flattened and can be electrically connected to the shell 20 through a connecting piece or directly. Of course, the above are only two examples, and are not limited to this. The specific design is based on actual needs.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cover, applied to square shell batteries, characterized in that: The battery cover includes: a plurality of lower plastics, and the plurality of lower plastics are arranged in sequence along a preset direction, wherein any two adjacent lower plastics are assembled together.

2. The battery cover according to claim 1, characterized in that: Any two adjacent lower plastics are detachably connected.

3. The battery cover according to claim 2, characterized in that: Any two adjacent lower plastics are detachably connected by snap-fitting.

4. The battery cover according to claim 3, characterized in that: When any two adjacent lower plastics are connected by snapping, one of the two adjacent lower plastics is provided with a snap portion, the other of the two adjacent lower plastics is provided with a snap hole, and the snap portion is snapped into the snap hole.

5. The battery cover according to any one of claims 1 to 4, characterized in that: The battery cover also includes a bus bar, and the bus bar is installed on the lower surface of at least one of the plurality of lower plastics.

6. The battery cover according to claim 5, characterized in that: The busbar is formed with a first positioning portion, the lower plastic assembled with the busbar is formed with a second positioning portion, and the first positioning portion and the second positioning portion are matched with each other for positioning.

7. The battery cover according to claim 5, characterized in that: The busbar includes a mounting portion and a connecting portion connected to each other, and the connecting portion and the mounting portion are bent; the mounting portion is installed on the corresponding lower surface of the lower plastic, and the connecting portion is used to extend to the side of the pole ear cluster of the pole group of the square shell battery arranged along its height direction, and is laser welded with the pole ear cluster.

8. The battery cover according to claim 7, characterized in that: The battery cover plate also includes a cover plate and a pole; wherein the plurality of lower plastics are arranged on one side of the cover plate close to the pole group of the square shell battery; The cover plate is formed with a first mounting through hole, and the lower plastic located below the first mounting through hole is formed with a second mounting through hole, the pole is sequentially passed through the first mounting through hole and the second mounting through hole, and both ends of the pole along its height direction extend to the outside of the cover plate and the lower plastic respectively; the pole abuts against the mounting portion of the busbar and is connected by laser welding.

9. The battery cover according to claim 8, characterized in that: A nano ceramic coating is provided on one side of the lower plastic close to the pole group and around the periphery of the second mounting through hole; and / or A limiting groove is arranged on one side of the lower plastic near the pole group, a limiting portion is formed on one end of the pole near the pole group, and the limiting portion is arranged in the limiting groove.

10. The battery cover according to claim 7, characterized in that: The mounting portion is parallel to the lower surface of the lower plastic, and the connecting portion is arranged perpendicular to the mounting portion; and / or The number of the connecting parts is two, and they are respectively arranged on two opposite sides of the mounting part to form a U-shaped structure.

11. A square shell battery, characterized in that: The battery comprises a shell, an electrode group and a battery cover as claimed in claim 8; wherein the shell is a structure with a hollow interior and an opening formed at at least one end along its height direction, the electrode group is arranged in the shell, and the battery cover is sealed at the opening of the shell; A pole lug cluster is formed at at least one end of the pole group along the height direction thereof. The pole lug cluster extends along the height direction of the pole group, and the pole lug cluster is connected to the busbar by laser welding.

12. The square shell battery according to claim 11, characterized in that: The square-shell battery further includes an insulating sheet, and the insulating sheet is wrapped around the outside of the electrode group, so that one end of the electrode group that matches the busbar is exposed.

Images