Secondary lithium battery cover plate

Abstract

The utility model relates to a secondary lithium battery cover plate, including light aluminum sheet and two pole post components, be provided with two pole post holes on the light aluminum sheet, the pole post component all includes support and pole, two the pole post is inserted into two pole post holes respectively, the support connects the pole, and the support all includes the welding plate, the welding plate close to the front of light aluminum sheet, the back of light aluminum sheet is provided with the welding area opposite the welding plate for through laser build -up welding connection light aluminum sheet and welding plate in welding area, the utility model discloses through the mode of laser build -up welding and fix the pole post component on the cover plate, and the structure is stable, easy to assemble, and the welding slag is concentrated on the plane of the back of light aluminum sheet, and it is convenient for cleaning.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium batteries, specifically to a cover plate for a secondary lithium battery. Background Technology

[0002] Lithium-ion batteries possess advantages such as high voltage, long charge-discharge life, high energy density, low environmental pollution, and low self-discharge efficiency, making them widely used in portable electronic products such as mobile phones, laptops, and digital cameras. They also show great promise for applications in fields such as electric vehicles. With the expansion of their applications, higher performance requirements are being placed on lithium-ion batteries, especially with the increasing popularity of smartphones, leading to a growing demand for high-energy-density lithium-ion batteries.

[0003] Battery covers must be equipped with terminals. If the terminals, connecting pieces, and covers are not securely connected, short circuits, fires, and even explosions can easily occur during fast charging or overcharging. Therefore, existing lithium battery covers typically use welding to fix the terminals to the cover, which results in low production efficiency, produces welding slag that is difficult to detect and clean, and can easily cause incomplete welds, affecting product quality. Utility Model Content

[0004] Based on the above description, this utility model provides a secondary lithium battery cover plate, which fixes the electrode assembly to the cover plate by laser overlay welding. The structure is stable and easy to assemble, and the welding slag is concentrated on the flat surface on the back of the aluminum sheet, which is easy to clean.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A secondary lithium battery cover plate includes a light aluminum sheet and two electrode post assemblies; the light aluminum sheet is provided with two electrode post holes; each electrode post assembly includes a bracket and an electrode post, the two electrode posts are respectively inserted into the two electrode post holes, the bracket connects the electrode posts, and each bracket includes a welding plate, the welding plate being in close contact with the front side of the light aluminum sheet; the back side of the light aluminum sheet is provided with a welding area opposite to the welding plate, for connecting the light aluminum sheet and the welding plate by laser overlay welding in the welding area.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, both the welding plate and the welding area are arranged in a ring around the pole hole.

[0008] Furthermore, a positioning groove is provided on the front side of the aluminum sheet, and the welding plate is embedded in the positioning groove.

[0009] Furthermore, the electrode assembly also includes an upper plastic layer, and the electrode, the upper plastic layer, and the bracket are connected by injection molding.

[0010] Furthermore, the upper plastic covers the sidewall of the pole post; one end of the bracket is embedded in one end of the upper plastic, and the other end of the bracket extends out from the end of the upper plastic and folds outward to form the welding plate.

[0011] Furthermore, the cover plate also includes two sealing rings, which are respectively pressed between the aluminum sheet and the two pole post assemblies, and the two sealing rings are respectively matched with the edges of the two pole post holes.

[0012] Furthermore, one side of the sealing ring is provided with an annular extension, which is in close contact with the inner wall of the pole hole.

[0013] Furthermore, the cover plate also includes a lower plastic layer that covers the back side of the aluminum sheet.

[0014] Furthermore, the lower plastic sheet is provided with an air vent, and the aluminum sheet is provided with a mounting hole that matches the air vent, and an explosion-proof sheet is provided in the mounting hole.

[0015] Furthermore, the lower plastic sheet is provided with an injection hole, and the aluminum sheet is provided with a through hole that matches the injection hole.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0017] This invention uses laser welding to fix the pole assembly to the cover plate, resulting in a stable structure that is easy to assemble. At the same time, the welding slag is concentrated on the flat surface on the back of the aluminum sheet, making it easy to clean and without affecting the sealing performance of the sealing ring. Attached Figure Description

[0018] Figure 1 An exploded view of a secondary lithium battery cover provided for an embodiment of this utility model;

[0019] Figure 2 This is a schematic diagram of the installation method of the pole assembly according to an embodiment of the present utility model;

[0020] Figure 3 This is an exploded view of the pole assembly in an embodiment of the present invention;

[0021] Figure 4 This is a cross-sectional view of the pole assembly in an embodiment of this utility model;

[0022] Figure 5 This is a schematic diagram of the sealing ring structure in an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the welding area on the back of the aluminum sheet in an embodiment of this utility model;

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. Aluminum sheet; 11. Pole post hole; 12. Mounting hole; 13. Through hole; 14. Positioning groove; 2. Lower plastic; 21. Vent hole; 211. Liquid injection hole; 3. Pole post assembly; 31. Pole post; 32. Upper plastic; 33. Bracket; 331. Welding plate; 4. Sealing ring; 41. Extension; 5. Explosion-proof plate. Detailed Implementation

[0026] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0028] It is understood that spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “below,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0029] A secondary lithium battery cover includes an aluminum sheet 1, a lower plastic sheet 2, two electrode assemblies 3, and two sealing rings 4. The two electrode assemblies 3 serve as the positive and negative electrodes, respectively.

[0030] The electrode assembly 3 includes a bracket 33, an upper plastic layer 32, and an electrode post 31. The upper plastic layer 32 is used to pre-process the bracket 33 and the electrode post 31 into a single unit through injection molding. Specifically, the upper plastic layer 32 covers the sidewall of the electrode post 31. One end of the bracket 33 is embedded into one end of the upper plastic layer 32, and the other end of the bracket 33 extends from the end of the upper plastic layer 32 and folds outward to form a welding plate 331.

[0031] In this embodiment, the welding plate 331 surrounds the pole post 31 in a ring shape.

[0032] The aluminum sheet 1 has two electrode holes 11, and two electrodes 31 are inserted into the two electrode holes 11 respectively. The welding plate 331 is close to the front side of the aluminum sheet 1 and surrounds the electrode holes 11. The back side of the aluminum sheet 1 has a welding area opposite to the welding plate 331. In this embodiment, the welding area is also in a ring shape surrounding the electrode holes 11, and is used to connect the aluminum sheet 1 and the welding plate 331 by laser overlay welding in the welding area.

[0033] In addition, a positioning groove 14 is provided on the front side of the aluminum sheet 1, and the welding plate 331 is embedded in the positioning groove 14 for positioning the pole assembly 3 during laser welding.

[0034] Two sealing rings 4 are respectively pressed between the aluminum sheet 1 and the two pole post assemblies 3, and the two sealing rings 4 respectively mate with the edges of the two pole post holes 11. In this embodiment, an annular extension 41 is provided on one side of the sealing ring 4, and the extension 41 is in close contact with the inner sidewall of the pole post hole 11, thereby enhancing the sealing performance of the contact surface between the pole post assembly 3 and the aluminum sheet 1.

[0035] The lower plastic 2 covers the back of the light aluminum sheet 1, shielding the weld seam and protecting the light aluminum sheet 1.

[0036] The lower plastic sheet 2 is provided with an air vent 21, and the aluminum sheet 1 is provided with a mounting hole 12 that matches the air vent 21. An explosion-proof sheet 5 is provided in the mounting hole 12 to release the gas in the lithium battery, thereby meeting the explosion-proof requirements of the lithium battery.

[0037] The lower plastic sheet 2 is provided with an injection hole 22, and the aluminum sheet 1 is provided with a through hole 13 that matches the injection hole 22, for adding electrolyte into the lithium battery.

[0038] In this embodiment, the two pole holes 11 are located at both ends of the aluminum sheet 1, and the air outlet 21 and the liquid injection hole 22 are disposed between the two pole holes 11.

[0039] The installation method in this embodiment includes the following steps:

[0040] (1) By injection molding, the bracket 33, the pole post 31 and the upper plastic 32 are integrated into a whole to manufacture two pole post assemblies 3, which serve as the positive and negative poles respectively.

[0041] (2) Install two sealing rings 4 into the two pole hole 11 respectively, and then install two pole components 3 into the two pole hole 11 respectively to press the sealing rings 4. Connect the pole component 3 and the aluminum sheet by laser overlay welding in the welding area on the back of the aluminum sheet 1.

[0042] (3) Install the lower plastic 2 and the explosion-proof sheet 5.

[0043] In this embodiment, the pole assembly 3 is fixed to the cover plate by laser overlay welding, which results in a stable structure that is easy to assemble. At the same time, the welding slag is concentrated on the flat surface on the back of the aluminum sheet 1, which is easy to clean and does not affect the sealing performance of the sealing ring 4.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cover plate for a secondary lithium battery, characterized in that, The device includes an aluminum sheet, two electrode assemblies, and two sealing rings. The aluminum sheet has two electrode holes. Each electrode assembly includes a bracket and an electrode. The two electrodes are respectively inserted into the two electrode holes. The bracket connects to the electrode, and each bracket includes a welding plate that is in close contact with the front side of the aluminum sheet. The back side of the aluminum sheet has a welding area opposite to the welding plate, used for laser-bonding the aluminum sheet and the welding plate in the welding area. The two sealing rings are respectively pressed between the aluminum sheet and the two electrode assemblies, and each sealing ring mates with the edge of one of the two electrode holes.

2. The secondary lithium battery cover plate according to claim 1, characterized in that, Both the welding plate and the welding area are arranged in a ring around the pole hole.

3. A secondary lithium battery cover plate according to claim 1, characterized in that, The front side of the aluminum sheet is provided with a positioning groove, and the welding plate is embedded in the positioning groove.

4. A secondary lithium battery cover plate according to claim 1, characterized in that, The electrode assembly also includes an upper plastic layer, and the electrode, the upper plastic layer, and the bracket are connected by injection molding.

5. A secondary lithium battery cover plate according to claim 4, characterized in that, The upper plastic covers the sidewall of the pole post; one end of the bracket is embedded in one end of the upper plastic, and the other end of the bracket extends out from the end of the upper plastic and is folded outward to form the welding plate.

6. A secondary lithium battery cover plate according to claim 1, characterized in that, One side of the sealing ring is provided with an annular extension, which is in close contact with the inner wall of the pole hole.

7. A secondary lithium battery cover plate according to claim 1, characterized in that, It also includes a lower plastic layer that covers the back side of the aluminum sheet.

8. A secondary lithium battery cover plate according to claim 7, characterized in that, The lower plastic sheet is provided with an air vent, and the aluminum sheet is provided with a mounting hole that matches the air vent. An explosion-proof sheet is installed in the mounting hole.

9. A secondary lithium battery cover plate according to claim 7, characterized in that, The lower plastic sheet is provided with a liquid injection hole, and the aluminum sheet is provided with a through hole that matches the liquid injection hole.

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