Liquid injection hole sealing glue nail, battery cell top cover and battery cell
By designing a sealing nail with an expansion structure for the injection hole, the problems of missing sealing nails and complex processes were solved, which simplified the process, reduced material usage, improved cell consistency, and enhanced sealing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-03-10
AI Technical Summary
The existing sealing nail structure has problems such as missing insertion, improper insertion which is difficult to identify, increased process complexity and material costs, and the use of temporary adhesive nails affects the consistency of battery cells and complicates the process.
A sealing nail for injection holes has been designed, including nail legs, nail shoulders, and nail cores. The sealing nail with an expansion structure achieves sealing through the expansion and compression of the fixing nail and the sealing part, avoiding the welding process and allowing for repeated disassembly and reuse.
This avoids problems such as missing insertions and incomplete insertions, simplifies the process, reduces material usage, improves cell consistency, shortens the process flow, and enhances the sealing effect.
Smart Images
Figure CN223986695U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery cell structure technology, specifically to a liquid injection hole sealing nail, a battery cell cover, and a battery cell. Background Technology
[0002] With the development of the new energy industry, the application of lithium-ion batteries is constantly expanding, and they are widely used in 3C digital products, electric vehicles, energy storage and other fields. Square lithium batteries have become one of the mainstream lithium battery products due to their superior performance and high manufacturing efficiency. During the production of square aluminum-cased cells, electrolyte is added to the cell through the injection hole on the top cover in a dry environment. After injection, the injection hole needs to be sealed with a sealing pin to completely isolate the inside of the cell from the external environment.
[0003] Existing sealing nails include sealant nails 31 and aluminum sealing nails 32, see Figure 1 Sealing nails 31 and aluminum nails 32 need to be installed sequentially; after inserting sealing nail 31 into the injection hole, aluminum nail 32 is then welded on. If sealing nail 31 is missed or not properly inserted, it is difficult to identify and requires an additional insertion step, necessitating additional equipment investment. Furthermore, existing technology typically inserts temporary sealing nails into the injection hole after the first injection to isolate air during high-temperature static aging; the temporary sealing nails are removed before venting begins, followed by venting in the cabinet. After venting, a second injection is performed, and then sealing nails are inserted again and aluminum nails are welded on. The use of temporary sealing nails increases material costs. Additionally, different batches of cells using the same batch of temporary sealing nails may have residual electrolyte on the temporary nails affecting each other, leading to poor cell consistency. The use of temporary sealing nails also increases process complexity. Utility Model Content
[0004] The existing sealing nail structure mentioned in the background art has several problems, including difficulty in identification if the sealing nail is not inserted properly or is not inserted in the correct position; the need to add a nail insertion process, requiring additional equipment investment and increasing material costs due to the use of temporary nails; the possibility that residual electrolyte on the temporary nails may affect each other, resulting in poor consistency of the battery cells; and increased process complexity. The purpose of this utility model is to provide a sealing nail for the injection hole, a battery cell cover, and a battery cell.
[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:
[0006] First aspect
[0007] This application provides a sealing nail for an injection hole, comprising: a nail leg, a nail shoulder, and a nail core; the nail leg includes a sealing portion for sealing the injection hole provided on the top cover of the battery cell; the nail shoulder includes a fastening portion disposed above the sealing portion; the nail core includes a pressure-bearing buckle, a fixing nail, and an anti-detachment head arranged sequentially from top to bottom; the fixing nail is slidably connected to a movable hole opened in the middle of the fastening portion, and the anti-detachment head is located inside the sealing portion, or passes through the sealing portion and is located below it.
[0008] The nail shoulder includes an anti-detachment part disposed at the lower end of the fastening part, and the anti-detachment part is inserted into the sealing part.
[0009] The sealing part has a hollow inverted frustum structure that runs vertically through the middle and is connected to the movable hole at the top. The anti-detachment head is located inside the hollow inverted frustum structure or passes through the hollow inverted frustum structure and is located below it.
[0010] The upper end of the injection hole is a groove, and the fastening part can be embedded in the groove, and the depth of the groove is the same as the height of the fastening part.
[0011] The lower side of the sealing part is also provided with a beveled guide part; the lower end diameter of the guide part is smaller than the diameter of the injection hole.
[0012] The sealing part is made of elastic rubber material.
[0013] The nail shoulder, the fixing nail in the nail core, and the pressure buckle are all made of metal.
[0014] The outer and inner sides of the sealing part, the inner wall of the injection hole and the outer surface of the fixing nail, the lower surface of the fastening part and the upper end face of the anti-loosening head, as well as the connecting surface with the sealing part are all frosted surfaces.
[0015] Second aspect
[0016] This application provides a battery cell top cover, including the aforementioned liquid injection hole sealing nail.
[0017] Third aspect
[0018] This application provides a battery cell, including the aforementioned battery cell top cover.
[0019] Compared with the prior art, the beneficial effects of this utility model are:
[0020] This utility model provides a sealing nail for the injection hole, which avoids the difficulty in identification caused by missing or improperly inserted sealing nails in traditional sealing nails, reduces the number of nail insertion steps, and shortens the process flow. In addition, this sealing nail can be disassembled multiple times, avoiding the use of temporary sealing nails, reducing material usage, and avoiding mutual interference between different batches of electrolyte caused by the reuse of temporary sealing nails. Finally, the sealing result is achieved by inserting the sealing nail with an expansion structure, eliminating the need for welding nails and shortening the process flow. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of a traditional sealing nail welding installation structure;
[0022] Figure 2 A schematic diagram of the structure of a sealing nail for an injection hole provided in an embodiment of this utility model;
[0023] Figure 3 This is a schematic diagram of the connection structure between the nail shoulder and the nail leg in an embodiment of this utility model;
[0024] Figure 4 This is a schematic diagram of the nail core structure in an embodiment of this utility model;
[0025] Figure 5 This is a schematic diagram of the first mounting structure of the injection hole sealing nail and the battery cell top cover provided in an embodiment of the present utility model;
[0026] Figure 6 This is a schematic diagram of the second mounting structure of the injection hole sealing nail and the battery cell top cover provided in an embodiment of the present utility model;
[0027] Figure 7 This is a schematic diagram of the third mounting structure of the injection hole sealing nail and the top cover of the battery cell provided in an embodiment of the present utility model;
[0028] In the diagram: 10-Cell top cover; 11-Injection hole; 111-Groove; 20-Sealing nail; 21-Shoulder of nail; 211-Snap-fit part; 212-Anti-detachment part; 213-Moving hole; 22-Leg of nail; 221-Sealing part; 222-Guide part; 23-Core of nail; 231-Pressure buckle; 232-Fixing nail; 233-Anti-detachment head; 31-Sealing nail; 32-Sealing aluminum nail. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", 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 are not intended to indicate or imply that the device or component 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.
[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting; they can refer to direct connection or indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0032] Example 1
[0033] like Figures 1-7 The diagram shows the structure of an embodiment provided by this utility model.
[0034] This embodiment provides a sealing nail for an injection hole, including: nail leg 22, nail shoulder 21, and nail core 23; the nail leg 22 includes a sealing part 221, which is used to seal the injection hole 11 provided on the top cover 10 of the battery cell; the nail shoulder 21 includes a fastening part 211, which is disposed above the sealing part 221; the nail core 23 includes a pressure-bearing buckle 231, a fixing nail 232, and an anti-detachment head 233 arranged sequentially from top to bottom; the fixing nail 232 is slidably connected to the movable hole 213 opened in the middle of the fastening part 211, and the anti-detachment head 233 is located inside the sealing part 221, or passes through the sealing part 221 and is located below it.
[0035] It should be noted that the nail shoulder 21 and nail leg 22 are integrally formed; the sealing part 221 works with the nail core 23 to seal the injection hole 11; the fixing nail has a cylindrical structure.
[0036] This utility model provides a non-welded physical sealing structure, which uses a sealing nail with an expansion structure. Through the expansion and compression between the fixing nail and the sealing part and the cover plate, the friction between the sealing part and the inner wall of the injection hole and between the sealing part and the fixing nail is increased, thus fixing the injection sealing nail to the top cover of the battery cell.
[0037] In use, after one injection, the sealing nail for the injection hole provided in this embodiment can be used as a temporary sealing nail. Insert the sealing part 221 into the injection hole 11 and press down the fastening part 211 until the fastening part 211 abuts against the contact surface outside the injection hole, achieving a temporary seal. When it is necessary to remove the sealing nail for the venting process, apply force directly to the pressure buckle 231 upwards. The lower end of the fixing nail 232, which is integrated with the pressure buckle, along with the fastening part 211, can pull out the connected sealing part 221, allowing the sealing nail to be easily removed. If multiple injections or venting are required, the above operation can be repeated. It should be noted that before the final seal is achieved, the fixing nail 232 does not need to be pressed down, and the pressure buckle 231 does not need to abut against the nail shoulder 21. The diameter of the anti-detachment head 233 at the lower end of the fixing nail 232 is larger than the movable hole 213 on the fastening part 211, which ensures that the nail core 23 and the nail shoulder 21 will not separate when the sealing nail is removed by upward force.
[0038] It should be noted that, since the diameter of the anti-loosening head 233 is slightly larger than that of the fixing nail 232, the anti-loosening head 233 and the fixing nail 232 can isolate the airflow between the sealing part 221 and the movable hole 213, achieving a preliminary sealing effect. When it is necessary to remove the glue nail, since the pressure buckle 231 is not pressed down, it can be used as the force point for removing the nail. When an upward force is applied, the entire nail core 23 part will move upward, along with the nail shoulder 21 that abuts against the nail core 23 through the anti-loosening head 233 and the nail leg 22 that is connected to the nail shoulder 21 through the anti-loosening part 212, moving upward, thereby removing the sealing glue nail.
[0039] When sealing with a sealing pin after multiple injections, the sealing part 221 is inserted into the injection hole, and the fastening part 211 is pressed down until it abuts against the contact surface outside the injection hole. The pressure-bearing buckle 231 is then pressed down so that the lower surface of the pressure-bearing buckle 231 abuts against the upper surface of the fastening part 211. The lower end of the fixing pin 232 is pushed into the sealing part 221. The outer side of the sealing part is restrained by the top cover 10 of the battery cell, and the inner side is squeezed by the fixing pin 232. The fixing pin 232 is made of metal and is not easily deformed. It is understandable that the pressure on the bottom of the sealing part increases, causing the friction between the sealing part 221 and the top cover 10, as well as between the sealing part 221 and the fixing pin 232, to increase. The anti-detachment head 233 is interference-fitted with the sealing part 221 to prevent the fixing pin from springing back, thereby achieving a sealing effect.
[0040] After the fixing nail 232 is fully inserted into the sealing part 221, the anti-detachment head 233 will abut against the lower surface of the sealing part 221. Since the diameter of the anti-detachment head 233 is larger than the diameter of the bottom hole of the sealing part 221, the anti-detachment head 233 can prevent the nail core 23 from separating from the sealing part 221, while increasing the overall sealing performance of the glue nail, thus completing the self-fixing and glue nail sealing process through expansion and compression.
[0041] In a preferred embodiment, the nail shoulder 21 includes an anti-detachment part 212 disposed at the lower end of the fastening part 211, wherein the anti-detachment part 212 is inserted into the sealing part 221 for connecting the nail leg 22 and the nail shoulder 21.
[0042] In a preferred embodiment, the sealing part 221 has a hollow inverted frustum structure that runs vertically through the middle and is connected to the movable hole 213 at the top. The anti-detachment head 233 is located inside the hollow inverted frustum structure or passes through the hollow inverted frustum structure and is located below it.
[0043] The hollow truncated cone structure is a truncated cone with a large upper diameter and a small lower diameter. This structure allows the fixing pin 232 to be inserted into the sealing part and squeezed to form sufficient compressive force, ensuring that the friction between the fixing pin 232 and the sealing part 221, and between the sealing part 221 and the injection hole is sufficient to achieve a sealing effect.
[0044] In a preferred embodiment, the upper end of the injection hole 11 is a groove 111, the fastening part 211 can be embedded in the groove 111, and the depth of the groove 111 is consistent with the height of the fastening part 211.
[0045] In use, the fastening part 211 abuts against the outside of the injection hole 11, and the upper surface of the fastening part 211 is flush with the groove 111. Specifically, the countersunk groove 111 is a conical groove, and the shape of the fastening part matches, making it easy to judge whether the pin is normal after assembly.
[0046] In a preferred embodiment, in order to facilitate the quick insertion of the nail leg 22 into the injection hole, the lower side of the sealing part 221 is also provided with a beveled guide part 222; the lower end diameter of the guide part 222 is smaller than the diameter of the injection hole 11, so as to facilitate the quick insertion of the nail leg into the injection hole.
[0047] In a preferred embodiment, the sealing portion 221 is made of an elastic rubber material.
[0048] Specifically, the sealing part 221 is made of one of fluororubber, PP, or PE. The material used to make the sealing part 221 is not limited to the polymer materials listed in this embodiment, and other soft elastic materials can also be selected according to actual production needs.
[0049] In a preferred embodiment, the fixing nail 232 and the pressure buckle 231 in the nail shoulder 21 and nail core 23 are all made of metal.
[0050] Specifically, the shoulder 21 is made of either stainless steel or aluminum. The material used to make the shoulder 21 is not limited to the metal materials listed in this embodiment, but can also be made of other metal materials according to actual production needs, for fastening the shoulder 21 to the top cover 10.
[0051] Specifically, the pressure-bearing buckle 231, fixing nail 232, and anti-detachment head 233 in the nail core 23 are made of either stainless steel or aluminum. The materials used to make the pressure-bearing buckle 231, fixing nail 232, and anti-detachment head 233 are not limited to the metal materials listed in this embodiment, and other metal materials can be selected according to actual production needs.
[0052] In a preferred embodiment, the outer and inner sides of the sealing part 221, the inner wall of the injection hole 11 and the outer surface of the fixing nail 232, the lower surface of the fastening part 211 and the upper end face of the anti-detachment head 233, as well as the surface connected to the sealing part 221, are all frosted surfaces.
[0053] The lower surface of the fastening part 211 is sanded, and the part of the anti-detachment head 233 with a diameter larger than the movable hole 213 is also sanded to ensure the sealing performance during temporary sealing after liquid injection.
[0054] Specifically, the outer and inner sides of the sealing part 221, the inner wall of the injection hole, and the outer surface of the fixing nail 232 are sanded to increase the friction between the contact surfaces of the fixing nail 232 and the sealing part 221 after the fixing nail 232 is inserted into the sealing part 221. At the same time, the friction between the outer side of the sealing part 221 and the inner wall of the injection hole is increased, thereby obtaining a better fixing effect of the sealing nail and the sealing effect of the glue nail.
[0055] Example 2
[0056] This embodiment provides a battery cell top cover, including the aforementioned liquid injection hole sealing nail 20.
[0057] Example 3
[0058] This embodiment provides a battery cell, including the battery cell top cover 10 described above.
[0059] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A sealant pin for a liquid injection hole, characterized by comprising: 1) a pin body having a cylindrical shape, and 2) a sealant layer formed on the pin body. The pin leg (22) comprises a plugging part (221) for plugging a liquid injection hole (11) provided on a top cover (10) of an electric core; the pin shoulder (21) comprises a buckling part (211) provided above the plugging part (221); the pin core (23) comprises a pressure bearing buckle (231), a fixing pin (232) and an anti-extraction head (233) provided in sequence from top to bottom; the fixing pin (232) is in sliding connection with a movable hole (213) provided in the middle of the buckling part (211), and the anti-extraction head (233) is located in the plugging part (221) or below the plugging part (221). The pin shoulder (21) comprises an anti-extraction part (212) provided at the lower end of the buckling part (211), which is inserted into the plugging part (221).
2. The sealant pin of claim 1, wherein The middle of the plugging part (221) is a hollow structure of an inverted truncated cone which is communicated with the movable hole (213) and penetrates from top to bottom, and the anti-extraction head (233) is located in the hollow structure of the inverted truncated cone or below the hollow structure.
3. The sealant pin of claim 1, wherein The upper end of the liquid injection hole (11) is a groove (111), the buckling part (211) can be embedded in the groove (111), and the depth of the groove (111) is consistent with the height of the buckling part (211).
4. The sealant pin of claim 1, wherein The lower part of the plugging part (221) is further provided with a guide part (222) in the form of an inclined surface, and the lower end of the guide part (222) has a diameter smaller than that of the liquid injection hole (11).
5. The sealant pin of claim 1, wherein The plugging part (221) is made of elastic rubber material.
6. The sealant pin of claim 1, wherein The pin shoulder (21), the fixing pin (232) and the pressure bearing buckle (231) in the pin core (23) are all made of metal material.
7. The sealant pin of claim 1, wherein The outer side and the inner side of the plugging part (221), the inner wall of the liquid injection hole (11), the outer surface of the fixing pin (232), the lower surface of the buckling part (211), the upper end surface of the anti-extraction head (233) and the connecting surface with the plugging part (221) are all frosted surfaces.
8. The sealant pin of claim 1, wherein The injection hole sealing glue pin (20) as claimed in any one of claims 1-8 is included.
9. An electrode top cap, characterized by The top cover (10) of the electric core as claimed in claim 9 is included.
10. An electric cell characterized by