Battery top cover

Abstract

The utility model belongs to the technical field of battery top covers, and mainly relates to a battery top cover which comprises a cover plate and a sealing assembly, the cover plate is provided with a step part for assembling the sealing assembly and a liquid injection hole for assembling a plastic nail along the thickness direction of the cover plate, and the sealing assembly comprises a first sealing nail and a second sealing nail; the step part comprises a first step and a second step fixedly connected with the first step, and a first cavity for assembling the first sealing nail is formed in the first step in a surrounding manner; a second cavity for assembling a second sealing nail is arranged around the second step; the first step is fixedly connected with the liquid injection hole, the first sealing nail is provided with a first body part and a first extending part extending in the thickness direction of the first body part, and the first extending part is welded to the first step; according to the battery top cover, the air tightness can be remarkably improved, and the risk of electrolyte leakage is effectively reduced.

Description

Technical Field

[0001] This utility model belongs to the field of battery top cover technology, and specifically relates to a battery top cover. Background Technology

[0002] With the widespread application of new energy vehicles and portable electronic devices, the performance, safety, and reliability of aluminum-cased batteries have become particularly important. In the production of aluminum-cased batteries, the welding quality of the sealing pins directly affects the battery's safety and lifespan. Therefore, identifying defective sealing pin welds is crucial for ensuring battery leakage protection and overall performance.

[0003] Existing methods for inspecting sealing nail welds, such as helium gas testing and CCD image sensor screening, while capable of assessing weld quality to some extent, still suffer from numerous technical limitations. Firstly, helium gas testing can fail to inject helium into the battery beforehand or leaks can occur during the testing process, rendering the method ineffective. Secondly, CCD image sensors may not accurately identify minute pinhole-like defects on the edge of the sealing nail when analyzing weld quality. These shortcomings make it difficult to completely eliminate defective welds during production, leaving potential hazards and seriously hindering safe battery production.

[0004] Therefore, it is imperative to further improve the battery top cover structure to effectively reduce the risk of electrolyte leakage. Utility Model Content

[0005] The purpose of this invention is to provide a battery top cover that can significantly improve the sealing performance of the battery top cover, in order to address the shortcomings of the existing technology.

[0006] To achieve the above-mentioned objectives, this application implements the following technical solution:

[0007] A battery top cover includes a cover plate and a sealing assembly. Along the thickness direction of the cover plate, the cover plate is provided with a stepped portion for assembling the sealing assembly and an injection hole for assembling a rubber pin. The sealing assembly includes a first sealing pin and a second sealing pin.

[0008] The stepped portion includes a first step and a second step fixedly connected to one end of the first step. The first step surrounds a first cavity for mounting a first sealing nail; the second step surrounds a second cavity for mounting a second sealing nail.

[0009] The other end of the first step is fixedly connected to the injection hole. The first sealing nail has a first body part and a first extension part extending along the thickness direction of the first body part. The first extension part is welded to the first step.

[0010] The above technical solution produces the following technical effects:

[0011] To address the technical shortcomings of existing battery top covers, this application improves the existing battery top cover structure by providing a stepped portion along the thickness direction of the cover plate for assembling a sealing assembly and an injection hole for assembling a rubber staple. A first sealing staple and a second sealing staple are incorporated into the sealing assembly; welding the two staples significantly improves airtightness and effectively reduces the risk of electrolyte leakage.

[0012] Specifically, the stepped design ensures a tight connection between the sealing pin and the injection hole, thereby enhancing the sealing effect. The first sealing pin's structural design includes an integrated body and an extension, allowing for better welding to the stepped area and improving the weld's strength and reliability. This optimized design effectively overcomes the hidden dangers inherent in traditional sealing pin welding methods, improves battery safety, and fundamentally solves the problem of electrolyte leakage caused by poor welding.

[0013] As a further improvement of the battery top cover of this utility model, the first step includes a first step body and a first step wall fixedly connected to the first step body, and the first step wall is welded to the first extension.

[0014] As a further improvement to the battery top cover of this utility model, the first step body is perpendicularly connected to the first step wall.

[0015] As a further improvement of the battery top cover of this utility model, a first weld is provided between the first step wall and the first extension, and the first weld is used for welding the first step wall and the first extension.

[0016] As a further improvement of the battery top cover of this utility model, the first step body is provided with a first groove, which is used to receive the first extension.

[0017] As a further improvement of the battery top cover of this utility model, the second step is provided with a second step body and a second step wall, the cover plate is provided with a platform, the second step body is fixedly connected to the first step, and the second step wall is fixedly connected to the platform.

[0018] As a further improvement of the battery top cover of this utility model, the second step body is perpendicularly connected to the first step, and the second step wall is perpendicularly connected to the table surface.

[0019] As a further improvement of the battery top cover of this utility model, the second sealing nail is provided with a second body part and a second extension part extending along the thickness direction of the second body part, and the second extension part is welded to the second step.

[0020] As a further improvement of the battery top cover of this utility model, a second weld is provided between the second step wall and the second extension, and the second weld is used for welding the second step wall and the second extension.

[0021] As a further improvement to the battery top cover of this utility model, the diameter of the second sealing nail is larger than that of the first sealing nail. Attached Figure Description

[0022] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate the present invention and their descriptions, which are used to explain the present invention and do not constitute an undue limitation of the present invention.

[0023] In the attached diagram:

[0024] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of embodiment 2 in this utility model;

[0026] Figure 3 for Figure 2 A magnified view of a portion at point A.

[0027] in:

[0028] 1-Cover plate;

[0029] 11-Step section;

[0030] 111 - First step;

[0031] 1111 - First Step Body;

[0032] 1112 - First step wall;

[0033] 1113 - First groove;

[0034] 112 - Second step;

[0035] 1121-Two-step body;

[0036] 1122 - Second step wall;

[0037] 113 - First cavity;

[0038] 114 - Second cavity;

[0039] 12-Injection hole;

[0040] 13 - Countertop;

[0041] 2-Sealing assembly;

[0042] 21-First sealing nail;

[0043] 211-First body part;

[0044] 212 - First extension;

[0045] 2121 – First weld;

[0046] 22 - Second sealing pin;

[0047] 221-Second Body Section;

[0048] 222 - Second extension;

[0049] 2221 – Second weld;

[0050] 3-Glue nails. Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terminology used in the specification of this application is only for describing specific embodiments and is not intended to limit this application.

[0052] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0053] Although this application discloses preferred embodiments as described above, it is not intended to limit the claims. Any person skilled in the art can make several possible changes and modifications without departing from the concept of this application. Therefore, the scope of protection of this application should be determined by the scope defined in the claims of this application.

[0054] The present invention will be further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0055] Implementation Method 1

[0056] As is well known, after electrolyte is injected into square aluminum-cased batteries, sealing pins are welded to the injection port. To evaluate the sealing effect, a helium gas testing method is typically used. In addition, CCD image sensors are also used to screen the welding quality of the sealing pins.

[0057] However, neither of these two detection methods can completely and accurately identify poorly welded or substandard sealing nails. For example, the effective penetration depth of a sealing nail weld may be very small, and during battery use, gas expansion can cause the sealing nail to perforate, leading to electrolyte leakage and irreparable damage. During production, helium gas inspection and CCD image sensors often fail to effectively screen out these poorly welded sealing nails. Furthermore, helium may not have been injected into the battery before inspection, or the helium may have completely leaked before inspection, rendering the helium inspection ineffective. Additionally, if pinhole-like gaps appear on the edge of the sealing nail weld, CCD image sensors may also fail to identify these substandard cells.

[0058] Therefore, to solve the above problems, such as Figure 1-2 As shown, this application improves the existing battery top cover, especially the structure of the battery top cover injection hole 12, thereby reducing the risk of battery top cover leakage that cannot be detected by the above-mentioned detection methods. Specifically, the battery top cover of this application includes a cover plate 1 and a sealing assembly 2. Along the thickness direction of the cover plate 1, the cover plate 1 is provided with a stepped portion 11 for assembling the sealing assembly 2 and an injection hole 12 for assembling the sealing pin. The sealing assembly 2 includes a first sealing pin 21 and a second sealing pin 22. The stepped portion 11 includes a first step 111 and a second step 112 fixedly connected to one end of the first step 111. The first step 111 surrounds a first cavity 113 for assembling the first sealing pin 21. The second step 112 surrounds a second cavity 114 for assembling the second sealing pin 22. The other end of the first step 111 is fixedly connected to the injection hole 12. The first sealing pin 21 has a first body portion 211 and a first extension portion 212 extending along the thickness direction of the first body portion 211. The first extension portion 212 is welded to the first step 111.

[0059] The principle behind the above technical solution in reducing the risk of undetectable battery top cover leakage is as follows: The structural design of the stepped portion 11 allows the first sealing nail 21 and the second sealing nail 22 to be firmly welded to the first step 111 and the second step 112, respectively. This design not only enhances the connection strength between the sealing nail and the cover plate 1 but also further improves the sealing performance of the battery top cover through a double sealing method. Specifically, the first sealing nail 21 is tightly welded to the first step wall 1112 through its first extension 212, providing stable support for the first extension 212 and further enhancing the strength and sealing of the welded area. Therefore, even if the electrolyte is subjected to pressure during battery use, it is difficult for it to leak through the welded area, thereby greatly improving the safety and reliability of the battery.

[0060] It is worth noting that the second step 112 is connected to the first step 111, and the other end of the first step 111 is connected to the injection hole 12. Based on this, the second step 112 is positioned above the injection hole 12 and the first step 111, and therefore the second sealing pin 22 is also positioned above the first sealing pin 21. Thus, the battery top cover of this application forms a more robust multi-layered sealing structure. Under the combined action of the first sealing pin 21 and the second sealing pin 22, the sealing performance of the battery top cover is significantly improved.

[0061] Furthermore, the first step 111 includes a first step 111 body and a first step wall 1112 fixedly connected to the first step 111 body, and the first step wall 1112 is welded to the first extension 212. Thus, the first step 111 body, as a supporting structure, ensures its stability, while the welding of the first step wall 1112 to the first extension 212 further enhances the sealing performance of this structure. In addition, the vertical connection design between the first step 111 body and the first step wall 1112 not only simplifies the manufacturing process but also helps to improve the overall structural strength, ensuring the stability and reliability of the battery top cover during long-term use.

[0062] Furthermore, a first weld 2121 is provided between the first stepped wall 1112 and the first extension 212, for welding the first stepped wall 1112 and the first extension 212. The design of the first weld 2121 makes the welding process more defined and controllable, ensuring the accuracy and reliability of the welding. By precisely controlling the welding position and welding parameters, high-quality, high-strength welded connections can be achieved, further improving the sealing performance and safety of the battery top cover. At the same time, the presence of the first weld 2121 also facilitates subsequent welding quality inspection, making it easier to promptly detect and repair potential welding defects, thereby ensuring the overall quality of the battery top cover.

[0063] Furthermore, both the first sealing nail 21 and the second sealing nail 22 are made of aluminum, and their outer contours are both circular. This allows the sealing nails to better adapt to the shape of the step portion 11, ensuring a tight fit between the sealing nail and the step portion 11, thereby further improving the sealing performance of the battery top cover. It is worth noting that the first sealing nail 21 and the second sealing nail 22 have different diameters. This design allows the two sealing nails to form different sealing layers during welding, thus enhancing the multi-layer sealing structure of the battery top cover. With the combined effect of the first and second sealing layers, the sealing performance of the battery top cover is further improved, and the risk of electrolyte leakage is effectively reduced. Specifically, the diameter of the first sealing nail 21 is 5-10mm, and in the specific implementation process, it can be any one of 5mm, 6mm, 7mm, 8mm, 9mm and 10mm; the diameter of the second sealing nail 22 is 15-25mm, and in the specific implementation process, it can be any one of 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm and 25mm.

[0064] Furthermore, the width of the first step 111 and the second step 112 is 10-20mm. In specific implementation, it is any one of 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm and 25mm.

[0065] Implementation Method 2

[0066] like Figure 1-3 As shown, to further improve the sealing performance of the battery top cover of this application, a first groove 1113 is further provided on the first step 111 body. The first groove 1113 is used to receive the first extension 212 of the first sealing nail 21. This design allows the first extension 212 to be more stably positioned on the first step 111 body during the welding process, thereby improving the accuracy and reliability of the welding. At the same time, the presence of the first groove 1113 also helps to enhance the connection strength between the first sealing nail 21 and the step 11, further improving the sealing performance of the battery top cover.

[0067] Furthermore, the second step 112 is provided with a second step 112 body and a second step wall 1122, and the cover plate 1 is provided with a platform 13. The second step 112 body is fixedly connected to the first step 111, and the second step wall 1122 is fixedly connected to the platform 13. This design not only enhances the stability of the second step 112, but also helps to improve the overall structural strength of the battery top cover. At the same time, the welded connection between the second step wall 1122 and the second extension 222 of the second sealing nail 22 further improves the sealing performance of the battery top cover. In addition, the second step 112 body is perpendicularly connected to the first step 111, and the second step wall 1122 is perpendicularly connected to the platform 13. Thus, a stable right-angle connection structure is formed between the second step 112, the first step 111, and the platform 13, thus enhancing its structural strength and sealing performance.

[0068] Furthermore, the second sealing pin 22 is provided with a second body portion 221 and a second extension portion 222 extending along the thickness direction of the second body portion 221. The second extension portion 222 is welded to the second step 112. Thus, the second sealing pin 22 is tightly welded to the second step wall 1122 via its second extension portion 222, providing stable support for the second extension portion 222 and further enhancing the strength and sealing of the welded area. This design allows the second sealing pin 22 to be firmly fixed to the second step 112, making it difficult to loosen or leak even under significant pressure during battery use, thereby ensuring the long-term stability and reliability of the battery top cover. Simultaneously, the cooperation between the second sealing pin 22 and the first sealing pin 21 forms a multi-layer sealing structure, further improving the sealing performance of the battery top cover and reducing the risk of electrolyte leakage.

[0069] Furthermore, to further improve the sealing performance of the battery top cover, a second weld 2221 is provided between the second stepped wall 1122 and the second extension 222. The design of the second weld 2221 makes the welding process more defined and controllable, ensuring the accuracy and reliability of the welding. By precisely controlling the welding position and welding parameters, high-quality, high-strength welded connections can be achieved, further improving the sealing performance and safety of the battery top cover. At the same time, the presence of the second weld 2221 also facilitates subsequent welding quality inspection, making it easier to promptly detect and repair potential welding defects, thereby ensuring the overall quality of the battery top cover.

[0070] It is worth noting that the welding method for the first weld 2121 and the second weld 2221 in this application is either laser welding or friction stir welding. This ensures high quality and high strength of the weld while improving welding efficiency.

[0071] Other aspects that are the same as in Implementation Method 1 will not be described again in this implementation method.

[0072] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery top cover, comprising a cover plate (1) and a sealing assembly (2), wherein along the thickness direction of the cover plate (1), the cover plate (1) is provided with a stepped portion (11) for assembling the sealing assembly (2) and an injection hole (12) for assembling a rubber staple (3), characterized in that, The sealing assembly (2) includes a first sealing pin (21) and a second sealing pin (22); The step portion (11) includes a first step (111) and a second step (112) fixedly connected to one end of the first step (111). The first step (111) surrounds a first cavity (113) for mounting the first sealing nail (21); the second step (112) surrounds a second cavity (114) for mounting the second sealing nail (22). The other end of the first step (111) is fixedly connected to the injection hole (12). The first sealing nail (21) is provided with a first body part (211) and a first extension part (212) extending along the thickness direction of the first body part (211). The first extension part (212) is welded to the first step (111). The first step (111) includes a first step body (1111) and a first step wall (1112) fixedly connected to the first step body (1111), and the first step wall (1112) is welded to the first extension (212).

2. The battery top cover according to claim 1, characterized in that, The first step body (1111) is perpendicularly connected to the first step wall (1112).

3. A battery top cover according to claim 1, characterized in that, A first weld (2121) is provided between the first step wall (1112) and the first extension (212), and the first weld (2121) is used for welding the first step wall (1112) and the first extension (212).

4. A battery top cover according to claim 1, characterized in that, The first step body (1111) is provided with a first groove (1113), which is used to receive the first extension (212).

5. A battery top cover according to claim 1, characterized in that, The second step (112) is provided with a second step body (1121) and a second step wall (1122), and the cover plate is provided with a table surface (13). The second step body (1121) is fixedly connected to the first step (111), and the second step wall (1122) is fixedly connected to the table surface (13).

6. A battery top cover according to claim 5, characterized in that, The second step body (1121) is perpendicularly connected to the first step (111), and the second step wall (1122) is perpendicularly connected to the table surface (13).

7. A battery top cover according to claim 5, characterized in that, The second sealing nail (22) is provided with a second body part (221) and a second extension part (222) extending along the thickness direction of the second body part (221), and the second extension part (222) is welded to the second step (112).

8. A battery top cover according to claim 7, characterized in that, A second weld (2221) is provided between the second step wall (1122) and the second extension (222), and the second weld (2221) is used for welding the second step wall (1122) and the second extension (222).

9. A battery top cover according to claim 1, characterized in that, The diameter of the second sealing pin (22) is larger than that of the first sealing pin (21).

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