Cover plate assembly and battery

Abstract

The utility model provides a cover plate assembly and a battery. The cover plate assembly comprises a cover plate; the first connecting sheet is positioned on one side of the cover plate; the pole comprises a pole main body and a plate body; the pole main body penetrates through the cover plate and then is connected with the plate body; the plate body is connected with the first connecting sheet; the plate body and the cover plate are eccentrically arranged in the width direction of the cover plate. According to the technical scheme provided by the utility model, the problems that the overlapping welding area of the connecting sheet and the pole base of the cover plate assembly in the prior art is reduced and the welding area requirement is difficult to meet are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, specifically, relate to a cover plate subassembly and battery. BACKGROUND

[0002] The pole post base is an important part of the battery cell cover plate, generally welded with the connecting sheet, and plays a role of conducting. In the prior art, the connecting sheet and the pole post base are generally centered and overlapped and laser welded, but sometimes the connecting sheet is bent and the centering space is limited, the connecting sheet is difficult to completely align with the center of the pole post base, and the connecting sheet and the pole post base are out of the welding range of the pole post base, so that the overlapping welding area of the connecting sheet and the pole post base is small, and it is difficult to meet the welding area requirement, thereby leading to poor current-carrying capacity and further reducing the safety of the battery. SUMMARY

[0003] The main purpose of the utility model is to provide a cover plate subassembly and battery, so as to solve the problem that the overlapping welding area of the connecting sheet and the pole post base of the cover plate subassembly in the prior art is small and difficult to meet the welding area requirement.

[0004] In order to achieve the above purpose, the utility model provides a cover plate subassembly, which comprises: a cover plate; a first connecting sheet located on one side of the cover plate; a pole post comprising a pole post body and a plate body; the pole post body is connected with the plate body after penetrating through the cover plate, and the plate body is connected with the first connecting sheet; along the width direction of the cover plate, the plate body is eccentrically arranged with the cover plate.

[0005] Further, along the width direction of the cover plate, the plate body comprises a base body and a connecting piece connected with each other, one side of the base body is connected with the pole post body, the other side of the base body is welded with the first connecting sheet, and the connecting piece is welded with the first connecting sheet.

[0006] Further, the first connecting sheet comprises a first body and a first connecting body connected with the first body, the first connecting body and the first body are arranged in the width direction of the cover plate, the first body is configured to be connected with the first tab, and the plate body is welded with the first connecting body.

[0007] Further, the first body and the first connecting body are arranged in steps, and the first connecting body is away from the pole post relative to the first body.

[0008] Further, the cover plate subassembly further comprises a second connecting sheet connected with the first connecting body, the second connecting sheet is located on the side of the first connecting sheet away from the pole post, and the second connecting sheet is configured to be connected with the second tab.

[0009] Further, the second connecting sheet comprises a second body and a second connecting body, the second connecting body is connected with the first connecting body, one end of the second body is connected with the second connecting body, and the other end of the second body is connected with the second tab.

[0010] Further, the second body comprises a first plate segment and a second plate segment connected and arranged at an included angle, the first plate segment is connected with the second connector, and the second plate segment is welded with the second tab.

[0011] Further, the first plate segment and the second plate segment are arranged at intervals, and at least part of the second tab is located between the first plate segment and the second plate segment.

[0012] Further, the second body is arranged at intervals with the first body, the first tab is located between the second body and the first body, and the first tab is welded with the first body.

[0013] According to another aspect of the present application, the present application provides a battery, comprising: a shell; the above-mentioned cover plate assembly, the cover is arranged in the shell; an electric core assembly located in the shell, the electric core assembly has a first tab and a second tab, and the first tab and the second tab are connected with the plate body through a first connecting piece.

[0014] The technical scheme of the present application can increase the connection area between the plate body and the first connecting piece by arranging the plate body and the first connecting piece eccentrically, which can more evenly distribute the current, not only reducing the risk of local overheating, but also avoiding the problems of poor current-carrying capacity or unstable connection caused by insufficient welding area. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings accompanying the specification of this application form a part of the application and serve to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1 An exploded structural schematic view of an embodiment of the cover plate assembly of the present application is shown;

[0017] Figure 2 A top view of an embodiment of the cover plate assembly of the present application is shown;

[0018] Figure 3 An A-A sectional view of the cover plate assembly of the present application is shown; Figure 2

[0019] A structural schematic view of the pole of the cover plate assembly of the present application is shown; Figure 4 Figure 1

[0020] Figure 5 A structural schematic view of an embodiment of the cover plate assembly of the present application is shown.

[0021] Among them, the above-mentioned drawings include the following reference signs:

[0022] ​​1. Riveted aluminum block; 3. Insulating upper plastic; 4. Sealing ring; 6. Lower plastic; 10. Cover plate; 20. First connecting piece; 21. First connecting body; 22. First body; 23. Second body; 231. First plate segment; 232. Second plate segment; 24. Second connecting body; 25. Second connecting piece; 31. Pole post body; 32. Plate; 321. Base; 322. Connector; 41. First electrode tab; 42. Second electrode tab. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 As shown, an embodiment of this utility model provides a cover plate assembly. The cover plate assembly includes: a cover plate 10; a first connecting piece 20 located on one side of the cover plate 10; and a pole, including a pole body 31 and a plate 32; the pole body 31 passes through the cover plate 10 and is connected to the plate 32, the plate 32 is welded to the first connecting piece 20, and is arranged along the width direction of the cover plate 10; the plate 32 is eccentrically disposed from the cover plate 10.

[0025] In the above technical solution, by setting the plate 32 and the first connecting piece 20 eccentrically, the connection area between the plate 32 and the first connecting piece 20 can be increased. In this way, the current can be distributed more evenly, which can not only reduce the risk of local overheating, but also avoid the problem of poor overcurrent capacity or unstable connection caused by insufficient welding area.

[0026] Furthermore, the plate 32 and the cover plate 10 are eccentrically arranged, which enables the plate 32 to be eccentrically welded to the first connecting piece 20, thereby increasing the contact area between the plate 32 and the first connecting piece 20 and improving the current carrying capacity of the battery cell.

[0027] Preferably, in an embodiment of the present invention, the plate 32 is welded to the first connecting piece 20.

[0028] It should be noted that, in the embodiments of this utility model, the eccentric setting of the plate 32 and the cover plate 10 means that the plate 32 is offset from the center position of the cover plate 10 in the width direction, wherein the center position is the geometric center of the cover plate 10.

[0029] like Figure 1 and Figure 4 As shown in the embodiment of this utility model, along the width direction of the cover plate 10, the plate body 32 includes a base 321 and a connector 322 connected to each other. One side of the base 321 is connected to the pole body, and the other side of the base 321 is welded to the first connecting piece 20. The connector 322 is welded to the first connecting piece 20.

[0030] In the technical scheme, the connecting piece 322 is arranged, so that the part of the first connecting sheet 20 deviated due to the bending can be welded with the connecting piece 322, thereby increasing the welding area, improving the strength and stability of the welding point, and ensuring better electrical conductivity.

[0031] Preferably, in the embodiment of the utility model, Figure 3 The part of the base body 321 on the right side of the axis of the pole body 31 is welded with the first connecting sheet 20.

[0032] As shown in Figure 2 and Figure 3 In the embodiment of the utility model, the first connecting sheet 20 comprises a first body 22 and a first connecting body 21 connected with the first body 22, the first connecting body 21 and the first body 22 are arranged in the width direction of the cover plate 10, the first body 22 is configured to be connected with the first lug 41, and the plate body 32 is welded with the first connecting body 21.

[0033] Through the above arrangement, the first lug 41 can be electrically connected with the first connecting body 21 through the first body 22, so that the first connecting body 21 can be welded with the plate body 32, thereby realizing the flow guiding effect of the first connecting sheet; the first body 22 is used for connecting with the first lug 41, and the first connecting body 21 is welded with the plate body 32, so that the welding position of the plate body 32 and the first connecting sheet and the welding position of the first lug 41 and the first connecting sheet can be avoided from coinciding, thereby avoiding the problem of poor electrical connection quality caused by welding on both sides of the same position of the first connecting sheet.

[0034] As shown in Figure 5 In the embodiment of the utility model, the first body 22 and the first connecting body 21 are arranged in steps, and the first connecting body 21 is away from the pole relative to the first body 22.

[0035] Through the above arrangement, the first body 22 and the first connecting body 21 arranged in steps effectively utilize the three-dimensional space of the cover plate assembly, and provide a containing space for the first lug 41, that is, the side of the first body 22 away from the plate body 32 can contain the first lug 41, so as to ensure the stable contact between the first lug 41 and the first connecting sheet 20, avoid the extrusion of the lug in the assembly process, and protect the electrical performance and mechanical integrity of the lug.

[0036] As shown in Figure 1 and Figure 5 In the embodiment of the utility model, the cover plate assembly further comprises a second connecting sheet 25 connected with the first connecting body 21, the second connecting sheet 25 is located on the side of the first connecting sheet 20 away from the pole, and the second connecting sheet 25 is configured to be connected with the second lug 42.

[0037] In the above technical solution, a stable electrical path can be formed by connecting the second connecting piece 25 and the first connecting piece 20 in series, ensuring the electrical connection between the second tab 42 and the plate 32. This improves the reliability of the electrical connection and ensures smooth current flow even under conditions of complex internal structure and limited space of the battery cell, avoiding the problem of decreased electrical performance due to unstable connection.

[0038] Specifically, in the embodiments of this utility model, the current path between the second tab 42 and the plate 32 is conducted through the second connecting piece 25 and the first connecting piece 20, which helps to distribute the current evenly, reduces the single-point current density, and thus reduces the risk of local overheating.

[0039] Specifically, in the embodiments of this utility model, the second connecting piece 25 overlaps with the first connecting body 21 to form a laser welding area with the plate 32.

[0040] like Figure 5 As shown in the embodiment of this utility model, the second connecting piece 25 includes a second body 23 and a second connecting body 24. The second connecting body 24 is connected to the first connecting body 21. One end of the second body 23 is connected to the second connecting body 24, and the other end of the second body 23 is connected to the second tab 42.

[0041] With the above configuration, the second tab 42 can be electrically connected to the second connector 24 via the second body 23, and then electrically connected to the first connector 20 via the second connector 24, and then electrically connected to the plate 32 via the first connector 20. In this way, the first connector 20 and the second connector 32 can be electrically connected. The second body 23 is used to connect to the second tab 42, while the second connector 24 is connected to the first connector 20. This avoids the welding position of the second connector 25 to the first connector 20 and the welding position of the second connector 25 to the second tab 42 from coinciding, thereby avoiding the problem of poor electrical connection quality caused by welding both sides of the same position of the second connector 25.

[0042] like Figure 1 As shown in the embodiment of this utility model, the second body 23 includes a first plate segment 231 and a second plate segment 232 that are connected to each other and arranged at an angle. The first plate segment 231 is connected to the second connecting body 24, and the second plate segment 232 is welded to the second electrode tab 42.

[0043] In the above technical solution, the direct welding of the second plate segment 232 and the second electrode 42 establishes a solid electrical connection, ensuring that the current can be smoothly transmitted from the second electrode 42 to the second connector 24, and electrically connected to the plate body through the second connector 24 and the first connecting piece, thus ensuring the integrity and stability of the internal circuit of the battery cell.

[0044] Further, the first plate segment 231 and the second plate segment 232 are arranged at an angle, which can optimize the space of the cover plate assembly, so as to effectively utilize the limited space inside the battery cell.

[0045] Preferably, in the embodiment of the utility model, the second body 23 is bent by 180 degrees to form the first plate segment 231 and the second plate segment 232, and the second plate segment 232 is ultrasonically welded after being overlapped with the second tab 42.

[0046] As shown in Figure 1 and Figure 5 in the embodiment of the utility model, the first plate segment 231 and the second plate segment 232 are arranged at intervals, and at least part of the second tab 42 is located between the first plate segment 231 and the second plate segment 232.

[0047] In the above technical solution, the interval between the first plate segment 231 and the second plate segment 232 can effectively accommodate and position the second tab 42, avoiding unnecessary movement or deformation of the second tab 42 during assembly and use of the battery cell, thereby protecting the electrical performance and mechanical stability of the second tab 42.

[0048] Further, by positioning the second tab 42 between the first plate segment 231 and the second plate segment 232, it can ensure that the welding contact between the second tab 42 and the second plate segment 232 is more close and stable, which helps to reduce the contact resistance and improve the current transmission efficiency inside the battery cell.

[0049] As shown in Figure 1 and Figure 5 in the embodiment of the utility model, the second body 23 is arranged at intervals with the first body 22, the first tab 41 is located between the second body 23 and the first body 22, and the first tab 41 is welded with the first body 22.

[0050] In the above technical solution, by positioning the first tab 41 in the interval between the second body 23 and the first body 22, the space inside the battery cell is effectively utilized, avoiding interference of the first tab 41 with other components of the cover plate assembly, while ensuring the stability of the first tab 41.

[0051] Further, the welding of the first tab 41 and the first body 22 forms a direct and stable electrical connection path, which reduces the contact resistance of the connection point and improves the conduction efficiency of the current, thereby ensuring the electrical performance of the battery cell.

[0052] Preferably, in the embodiment of the utility model, the first tab 41 is ultrasonically welded with the first body 22.

[0053] It should be noted that the cover plate assembly of the embodiment of the present application is suitable for the inside of the blade cell, and in the case that the bending connecting piece has a small space, the connecting piece (the first connecting piece 20) is offset from the center area of the pole (the base 321), the plate body 32 is designed to be widened, that is, an additional connecting piece 322 is added, so that the offset connecting piece can be coincided and eccentric laser welded, thereby ensuring the welding area and the flow requirement.

[0054] Specifically, as shown in the drawings, Figure 1 The cover plate 10 includes an aluminum sheet and a lower plastic 6. Among them, the riveting aluminum block 1 is located at the outer periphery of the pole main body 31, the insulating upper plastic 3 is installed between the cover plate 10 and the riveting aluminum block 1, and the sealing ring 4 is located between the pole main body 31 and the cover plate 10, and each part is combined from top to bottom by a riveting tool.

[0055] The embodiment of the present application provides a battery, which comprises: a shell; the cover plate assembly described above, which is arranged on the shell; and a cell assembly located in the shell, wherein the cell assembly has a first tab 41 and a second tab 42, and the first tab 41 and the second tab 42 are connected with the plate body 32 through the first connecting piece 20.

[0056] Specifically, in the embodiment of the present application, the cell assembly comprises two cell packs, and the two cell packs correspond to the two first tabs 41 and the second tab 42 respectively.

[0057] The battery described above has all the advantages of the cover plate assembly described above, which will not be repeated here.

[0058] From the above description, it can be seen that the embodiment of the present application realizes the following technical effects: by eccentrically arranging the plate body and the first connecting piece, the connection area between the plate body and the first connecting piece can be increased, so that the current can be more evenly distributed, which not only reduces the risk of local overheating, but also avoids the problems of poor flow capacity or unstable connection caused by insufficient welding area.

[0059] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cover plate assembly, characterized in that, include: Cover plate (10); The first connecting piece (20) is located on one side of the cover plate (10); The pole includes a pole body (31) and a plate (32); the pole body (31) passes through the cover plate (10) and is connected to the plate (32), and the plate (32) is connected to the first connecting piece (20); Along the width direction of the cover plate (10), the plate body (32) is eccentrically disposed with respect to the cover plate (10).

2. The cover plate assembly according to claim 1, characterized in that, Along the width direction of the cover plate (10), the plate body (32) includes a base (321) and a connector (322) connected together. One side of the base (321) is connected to the pole body, and the other side of the base (321) is welded to the first connecting piece (20). The connector (322) is welded to the first connecting piece (20).

3. The cover plate assembly according to claim 1, characterized in that, The first connecting piece (20) includes a first body (22) and a first connecting body (21) connected to the first body (22). The first connecting body (21) and the first body (22) are arranged in the width direction of the cover plate (10). The first body (22) is configured to be connected to the first tab (41). The plate body (32) is welded to the first connecting body (21).

4. The cover plate assembly according to claim 3, characterized in that, The first body (22) and the first connector (21) are arranged in a stepped manner, with the first connector (21) being farther away from the pole relative to the first body (22).

5. The cover plate assembly according to claim 3, characterized in that, The cover plate assembly further includes a second connecting piece (25) connected to the first connecting body (21), the second connecting piece (25) being located on the side of the first connecting piece (20) away from the pole post, and the second connecting piece (25) being configured to connect to the second pole tab (42).

6. The cover plate assembly according to claim 5, characterized in that, The second connecting piece (25) includes a second body (23) and a second connecting body (24). The second connecting body (24) is connected to the first connecting body (21). One end of the second body (23) is connected to the second connecting body (24), and the other end of the second body (23) is connected to the second tab (42).

7. The cover plate assembly according to claim 6, characterized in that, The second body (23) includes a first plate segment (231) and a second plate segment (232) that are connected to each other and arranged at an angle. The first plate segment (231) is connected to the second connector (24), and the second plate segment (232) is welded to the second tab (42).

8. The cover plate assembly according to claim 7, characterized in that, The first plate segment (231) and the second plate segment (232) are spaced apart, and at least a portion of the second electrode tab (42) is located between the first plate segment (231) and the second plate segment (232).

9. The cover plate assembly according to claim 6, characterized in that, The second body (23) is spaced apart from the first body (22), the first electrode (41) is located between the second body (23) and the first body (22), and the first electrode (41) is welded to the first body (22).

10. A battery, characterized in that, include: case; The cover plate assembly according to any one of claims 1 to 9 is disposed on the housing; The battery cell assembly is located inside the housing. The battery cell assembly has a first tab (41) and a second tab (42). The first tab (41) and the second tab (42) are connected to the plate (32) through the first connecting piece (20).

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