Lithium battery sealing nail
By designing lithium battery sealing pins with multiple stepped structures and limiting blocks, the problem of inaccurate insertion of traditional sealing pins was solved, achieving reliable sealing effect and stable assembly, thus improving the assembly efficiency and quality of lithium batteries.
Patent Information
- Application Number
- CN202422604939.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-10-28
AI Technical Summary
Traditional lithium battery sealing pins are prone to over-insertion or under-insertion during the insertion process, resulting in poor sealing performance. This makes it difficult to detect abnormal products through equipment or manual identification, thus affecting the quality of the battery cells.
A lithium battery sealing pin is designed, employing a multi-step structure and limiting blocks, including the first to sixth steps and limiting blocks. Through the matching of the step structure and the limiting of the limiting blocks, the sealing pin is reliably, accurately, and smoothly installed at the injection hole position, and a stable connection is provided through the elastic recovery of the limiting blocks.
It improves the assembly quality and sealing effect of the sealing pins, is suitable for both manual and automated assembly, and enhances the assembly efficiency and quality of lithium batteries.
Smart Images
Figure CN223502159U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium battery technology, and in particular to a lithium battery sealing nail. Background Technology
[0002] With the increasing popularity of electric vehicles and portable electronic devices, lithium batteries are being used more and more widely. In the lithium battery manufacturing process, sealing pins are typically used after electrolyte injection. The sealing pin is first inserted into the injection hole, and then laser welding is performed to seal the hole. Traditional sealing pins usually have a cylindrical structure, which can easily lead to over-insertion during insertion, causing the pin to fall into the battery cell, resulting in cell quality risks or scrapping; or it may not be inserted properly, resulting in poor sealing. Either way, it is difficult to detect the defective product through equipment inspection or manual identification. Existing improved technologies, by setting a top stepped surface, can position the insertion position to some extent, but the assembly operation and sealing effect still have room for further improvement. Utility Model Content
[0003] The purpose of this utility model is to provide an improved sealing nail, with a corresponding structure on the cover plate, to address the shortcomings of the aforementioned background technology, so as to better improve the quality of assembly operations and sealing effect.
[0004] To achieve the above objectives, this utility model provides a lithium battery sealing nail, including a sealing nail body, multiple stepped structures disposed on the sealing nail body, and a limiting block;
[0005] The stepped structure includes a first step, a second step, a third step, a fourth step, a fifth step, and a sixth step, which are distributed sequentially from bottom to top on the sealing pin body. The first step is located at the top of the sealing pin body, and its outer diameter is larger than the diameter of the injection through hole. The outer diameter of the first step matches the injection counterhole to fill and seal the injection counterhole. The second step is located below and adjacent to the first step, and the third step is located below and adjacent to the second step. The outer diameter of the second step is smaller than the outer diameters of the first and third steps. The outer diameter of the third step is larger than the diameter of the injection through hole, and the third step fits against the top of the injection through hole and blocks it. The fourth, fifth, and sixth steps are located below the third step and are all used to insert into the injection through hole. The fourth and sixth steps are clearance fits with the injection through hole, and the fifth step is interference fits with the injection through hole to seal the injection through hole.
[0006] The limiting block is connected to the bottom end of the sixth step, and the limiting block is used to pass downward through the injection hole and limit its movement.
[0007] Furthermore, the height of the first step is 0.4 to 0.6 m, and the outer diameter of the first step is set to twice the diameter of the injection through hole.
[0008] Furthermore, the height of the second step is 0.3 to 0.6 m.
[0009] Furthermore, the height of the third step is 0.5 to 0.8 mm, and the outer diameter of the third step is set to 1.5 times the size of the injection through hole.
[0010] Furthermore, the outer diameter of the fourth step and the sixth step is set to 0.95 to 1.0 times the diameter of the injection through hole, and the outer diameter of the fifth step is set to 1.1 to 1.2 times the diameter of the injection through hole.
[0011] Furthermore, the heights of the fourth step, the fifth step, and the sixth step are set to be equal.
[0012] Furthermore, the limiting block includes a neck and an umbrella-shaped portion, wherein the outer diameter of the neck is smaller than the diameter of the injection through hole, and the maximum outer diameter of the umbrella-shaped portion is larger than the diameter of the injection through hole.
[0013] Furthermore, the maximum outer diameter of the umbrella-shaped portion is set to 1.2 times the diameter of the injection through-hole.
[0014] Furthermore, the sum of the heights of the fourth step, the fifth step, the sixth step, and the neck when they are not deformed is less than the depth of the injection hole. After the umbrella-shaped part protrudes through the injection hole and recovers its elasticity, the fourth step, the fifth step, the sixth step, and the neck deform and elongate, so that the limiting block and the third step are subjected to mutual tension.
[0015] Furthermore, the sealing nail body, the stepped structure, and the limiting block are all made of rubber material.
[0016] The above-mentioned solution of this utility model has the following beneficial effects:
[0017] The lithium battery sealing nail provided by this utility model, through the setting of multiple stepped structures and limiting blocks, can ensure that the sealing nail is reliably, accurately and smoothly installed at the position of the injection hole, while ensuring the sealing effect and the firmness after subsequent laser welding. It is suitable for manual assembly and automated assembly line assembly, improving the assembly quality of the sealing nail, thereby improving the assembly efficiency and quality of lithium batteries.
[0018] Other beneficial effects of this invention will be described in detail in the following detailed description section. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0020] Figure 2 This is an assembly diagram of the present invention.
[0021] [Explanation of Labels in the Attached Image]
[0022] 1-First step; 2-Second step; 3-Third step; 4-Fourth step; 5-Fifth step; 6-Sixth step; 7-Limiting block; 8-Injection through hole; 9-Injection counterhole; 10-Cover plate. Detailed Implementation
[0023] To make the technical problems, solutions, and advantages of this utility model clearer, a detailed description will be provided below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a locking connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of 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.
[0026] like Figure 1 , Figure 2As shown, this embodiment of the invention provides a lithium battery sealing pin, which seals the injection hole after electrolyte is added during the lithium battery manufacturing process. The injection hole is located at the cover plate 10, through which the added electrolyte enters the lithium battery cell. After the electrolyte injection is completed, the sealing pin is first inserted into the injection hole, and then laser welding is performed to seal it, thereby completing the sealing welding of the injection hole and maintaining a stable and sealed environment inside.
[0027] Specifically, the lithium battery sealing pin includes a sealing pin body and multiple stepped structures disposed on the sealing pin body. It should be noted that the sealing pin body and the stepped structures can be integrally molded and are both made of rubber materials, specifically fluororubber, EPDM, etc., with a Shore hardness ≤60°.
[0028] The stepped structure includes a first step 1, a second step 2, a third step 3, a fourth step 4, a fifth step 5, and a sixth step 6, which are distributed sequentially from bottom to top on the sealing pin body. The first step 1 is located at the top of the sealing pin body, and its height is preferably 0.4 to 0.6 m. The outer diameter of the first step 1 needs to be significantly larger than the diameter of the liquid injection through hole 8 to fill and seal the liquid injection counterbore 9, and also to help limit the sealing pin and prevent it from being over-inserted and falling into the battery cell. As a preferred embodiment, the outer diameter of the first step 8 is set to twice the diameter of the liquid injection through hole 8.
[0029] It should be noted that the injection countersunk hole 9 is located above the injection through hole 8, and it is recessed inward relative to the outer surface of the cover plate 10. Its shape and size match the first step 1 to ensure that the sealing pin can fully fill the injection countersunk hole 9, and the seal is achieved after laser welding.
[0030] In this embodiment, the second step 2 is located below and adjacent to the first step 1, and the third step 3 is located below and adjacent to the second step 2. The height of the second step 2 is preferably 0.3–0.6 m, and its outer diameter is smaller than that of the first step 1 and the third step 3, so as to provide a gripping point for the robotic arm's gripper on the automated assembly line, thus adapting to automated assembly.
[0031] In this embodiment, the height of the third step 3 is preferably 0.5 to 0.8 mm, and the outer diameter of the third step 3 also needs to be significantly larger than the diameter of the liquid injection through hole 8 to prevent the sealing pin from being over-inserted and falling into the battery cell. As a preferred embodiment, the outer diameter of the third step 3 is set to 1.5 times that of the liquid injection through hole 8. After assembly, the third step 3 fits against the top of the liquid injection through hole 8 and seals it.
[0032] In this embodiment, the fourth step 4, the fifth step 5, and the sixth step 6 are located below the third step 3 and are all used to insert into and maintain the injection through hole 8. The outer diameter of the fourth step 4 is set to 0.95 to 1.0 times the diameter of the injection through hole 8, meaning it has a clearance fit or interference fit with the injection through hole 8 and does not completely seal the injection through hole 8 itself. The outer diameter of the fifth step 5 is set to 1.1 to 1.2 times the diameter of the injection through hole 8, and it has an interference fit with the injection through hole 8. It is used to completely seal the injection through hole 8 and is crucial for blocking the injection through hole 8 from the inside. Of course, the outer diameter of the fifth step 5 should not be set too large to ensure that the insertion of the pin is smooth and does not significantly obstruct the flow. The sixth step 6 has the same dimensions as the fourth step 4 and will not be described further here.
[0033] It should be noted that the fourth step 4, the fifth step 5, and the sixth step 6 can fully fill the injection hole 8. In a preferred embodiment, the heights of the fourth step 4, the fifth step 5, and the sixth step 6 are set to be equal.
[0034] In this embodiment, a limiting block 7 is also provided at the bottom end of the sixth step 6. The limiting block 7 is used to pass downward through the injection through hole 8 and limit its movement, that is, after the sealing nail is assembled, the limiting block 7 is located inside the cover plate 10. The limiting block 7 adopts an irregular spherical shape, including a neck and an umbrella-shaped part. The outer diameter of the neck is smaller than the diameter of the injection through hole 8, and the maximum outer diameter of the umbrella-shaped part is larger than the diameter of the injection through hole 8, preferably set to 1.2 times the diameter of the injection through hole 8.
[0035] It should be noted that the umbrella-shaped part ensures that the sealing pin is inserted more smoothly into the injection hole 8 (guided by the conical lower surface). At the same time, the umbrella-shaped part can elastically recover after passing through the injection hole 8, thereby limiting the outward direction of the sealing pin and ensuring that the sealing pin will not be pulled out due to external force after insertion, and making it more secure after laser welding.
[0036] In a preferred embodiment, the sum of the heights of the fourth step 4, the fifth step 5, the sixth step 6, and the neck when undeformed is slightly less than the depth of the injection hole 8. When the umbrella-shaped portion protrudes through the injection hole 8 and elastically recovers, the tapered upper surface allows the fourth step 4, the fifth step 5, the sixth step 6, and the neck to slightly deform and elongate, thereby subjecting the limiting block 7 and the third step 3 to mutual tension, further ensuring the stable connection of the sealing pin in the injection hole 8. Additionally, the side surface of the first step 1 can also be configured as a tapered surface, matching the side surface of the injection counterhole 9, making the fit between the first step 1 and the injection counterhole 9 even tighter under the aforementioned tension.
[0037] In summary, the lithium battery sealing nail provided in this embodiment, through the setting of multiple stepped structures and limiting blocks 7, can ensure that the sealing nail is reliably, accurately and smoothly installed at the position of the injection hole, while ensuring the sealing effect and the firmness after subsequent laser welding. It is also suitable for manual assembly and automated assembly line assembly, improving the assembly quality of the sealing nail, thereby improving the assembly efficiency and quality of the lithium battery.
[0038] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0039] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.
Claims
1. A lithium battery sealing nail, characterized in that, It includes a sealing nail body, multiple stepped structures and limiting blocks disposed on the sealing nail body; The stepped structure includes a first step, a second step, a third step, a fourth step, a fifth step, and a sixth step, which are distributed sequentially from bottom to top on the sealing pin body. The first step is located at the top of the sealing pin body, and its outer diameter is larger than the diameter of the injection through hole. The outer diameter of the first step matches the injection counterhole to fill and seal the injection counterhole. The second step is located below and adjacent to the first step, and the third step is located below and adjacent to the second step. The outer diameter of the second step is smaller than the outer diameters of the first and third steps. The outer diameter of the third step is larger than the diameter of the injection through hole, and the third step fits against the top of the injection through hole and blocks it. The fourth, fifth, and sixth steps are located below the third step and are all used to insert into the injection through hole. The fourth and sixth steps are clearance fits with the injection through hole, and the fifth step is interference fits with the injection through hole to seal the injection through hole. The limiting block is connected to the bottom end of the sixth step, and the limiting block is used to pass downward through the injection hole and limit its movement.
2. The lithium battery sealing nail according to claim 1, characterized in that, The height of the first step is 0.4 to 0.6 m, and the outer diameter of the first step is set to be twice the diameter of the injection through hole.
3. The lithium battery sealing nail according to claim 1, characterized in that, The height of the second step is 0.3 to 0.6 m.
4. A lithium battery sealing nail according to claim 1, characterized in that, The height of the third step is 0.5 to 0.8 mm, and the outer diameter of the third step is set to 1.5 times the size of the injection hole.
5. A lithium battery sealing nail according to claim 1, characterized in that, The outer diameter of the fourth step and the sixth step is set to be 0.95 to 1.0 times the diameter of the injection through hole, and the outer diameter of the fifth step is set to be 1.1 to 1.2 times the diameter of the injection through hole.
6. A lithium battery sealing nail according to claim 5, characterized in that, The heights of the fourth step, the fifth step, and the sixth step are set to be equal.
7. A lithium battery sealing nail according to claim 1, characterized in that, The limiting block includes a neck and an umbrella-shaped portion. The outer diameter of the neck is smaller than the diameter of the injection through hole, and the maximum outer diameter of the umbrella-shaped portion is larger than the diameter of the injection through hole.
8. A lithium battery sealing nail according to claim 7, characterized in that, The maximum outer diameter of the umbrella-shaped part is set to 1.2 times the diameter of the injection through hole.
9. A lithium battery sealing nail according to claim 7, characterized in that, The sum of the heights of the fourth step, the fifth step, the sixth step, and the neck when they are not deformed is less than the depth of the injection hole. After the umbrella-shaped part protrudes through the injection hole and recovers its elasticity, the fourth step, the fifth step, the sixth step, and the neck deform and elongate, so that the limiting block and the third step are subjected to mutual tension.
10. A lithium battery sealing nail according to any one of claims 1-9, characterized in that, The sealing nail body, the stepped structure, and the limiting block are all made of rubber material.