Sealing nail structure and cylindrical battery
The sealing nail structure with a cover plate and heat dissipation holes addresses residual thermal stress issues, enhancing battery safety and performance by preventing weld cracks and leakage.
Patent Information
- Application Number
- CN202421053534.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-05-14
AI Technical Summary
The sealing process of cylindrical batteries fails to efficiently remove residual thermal stress, which can lead to cracks and leakage, which can lead to cracks and leakage, which can lead to cracks and leakage, which can lead to cracks and leakage, which can lead to cracks and leakage, which can lead to cracks and leakage, which can lead to cracks and cracks and leakage, which can lead to cracks and leakage, which can lead to cracks and cracks and leakage, which can lead to cracks and leakage, which can lead to cracks and leakage, which can result in battery performance degradation and safety hazards.
A sealing nail structure with a cover plate and heat dissipation holes is used to release residual thermal stress, preventing weld cracks and enhancing battery safety and performance.
The heat dissipation holes effectively release residual thermal stress, preventing weld cracks and improving battery safety and performance by ensuring consistent thermal stress release.
Smart Images
Figure CN222191100U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium batteries, and in particular mainly to a sealing nail structure and a cylindrical battery. Background Art
[0002] A cylindrical battery is a type of lithium battery, which has a metal cylindrical shell with a battery cell in it. During the manufacturing process of the cylindrical battery, electrolyte needs to be injected through an injection hole at one end of the shell. After the electrolyte is injected, the injection hole needs to be sealed, otherwise it will cause battery leakage.
[0003] The sealing process of the injection hole requires welding the sealing pin to the injection hole, and then sealing the injection hole flat with a cover plate. When the sealing pin is welded, the temperature of the surrounding environment of the sealing pin is inconsistent with the temperature of the welding position, which will generate thermal stress; the welding thermal stress cannot be fully released and will remain in the weld, forming residual stress. When the welding thermal stress reaches a certain level, it will cause the weld to crack, which will lead to battery leakage, which will not only reduce battery performance, but also pose a great safety hazard.
[0004] In view of this, it is necessary to improve the structure of existing cylindrical batteries. Utility Model Content
[0005] In view of the deficiencies in the prior art, the utility model provides a sealing nail structure and a cylindrical battery to solve the problem of insufficient release of residual thermal stress at the sealing position of the liquid injection hole of the existing cylindrical battery.
[0006] The utility model discloses a sealing nail structure, comprising an end cover, a sealing nail and a cover plate, wherein the end cover is provided with a sealing hole, wherein the sealing hole is a sinking hole, wherein a liquid injection hole is provided on the bottom surface of the sealing hole, wherein the sealing nail is installed in the liquid injection hole, wherein the cover plate is installed in the sealing hole, wherein a plurality of heat dissipation holes are provided on the cover plate, wherein the heat dissipation holes surround the sealing nail for at least one circle.
[0007] Preferably, the sealing nail comprises a nail head and a nail column, the nail column is inserted into the injection hole, and the nail head is attached to the bottom surface of the sealing hole.
[0008] Preferably, the cover plate is embedded in the sealing hole, a clearance groove is formed on the surface of the cover plate facing the injection hole, and the nail head is arranged in the clearance groove.
[0009] Preferably, the heat dissipation hole surrounds the outer side of the clearance groove.
[0010] Preferably, the surface of the cover plate facing away from the liquid injection hole is flush with the surface of the end cap.
[0011] Preferably, the heat dissipation holes surround the sealing pin three times.
[0012] Preferably, the heat dissipation hole is a blind hole.
[0013] Preferably, the depth of the heat dissipation hole is half the thickness of the cover plate.
[0014] Preferably, the side wall of the sealing hole is a conical structure, and the side wall of the cover plate is a conical structure.
[0015] The utility model discloses a cylindrical battery, comprising any of the above-mentioned sealing nail structures, and further comprising a side wall and a pole, wherein the side wall and the end cover form a shell, the pole is mounted on the end cover, and the pole and the sealing hole are located on the same surface of the end cover.
[0016] The beneficial effects of the utility model are:
[0017] By adding a cover plate to the sealing pin and setting multiple circles of heat dissipation holes on the upper cover plate of the sealing pin, this hole-shaped structure can effectively and fully release the residual thermal stress generated by welding, which is conducive to preventing cracks from occurring at the weld, thereby improving the safety and performance of the battery. Therefore, the utility model solves the problem of insufficient release of residual thermal stress at the sealing position of the injection hole of the existing cylindrical battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0019] Figure 1 It is a cross-sectional view of the sealing nail structure of the utility model, and an enlarged view of the heat dissipation hole;
[0020] Figure 2 is a top view of the cover plate;
[0021] Figure 3 This is a schematic diagram of the structure of the cylindrical battery of the utility model, in which the sealing pins and the cover plate are hidden.
[0022] Explanation of the reference numerals: 1. Shell; 11. Side wall; 12. End cover; 121. Liquid injection hole; 122. Sealing hole; 2. Sealing nail; 21. Nail head; 22. Nail column; 3. Cover plate; 31. Top surface; 32. Make way groove; 33. Heat dissipation hole; 4. Pole. DETAILED DESCRIPTION
[0023] The following will disclose multiple embodiments of the present invention with diagrams. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. In addition, for the purpose of simplifying the diagram, some conventional structures and parts will be depicted in a simple schematic manner in the diagram.
[0024] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.
[0025] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish between parts or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0026] In order to further understand the content, features and effects of the utility model, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:
[0027] Reference Figure 1 and Figure 2 The utility model discloses a sealing nail structure, including an end cover 12, a sealing nail 2 and a cover plate 3, wherein the end cover 12 is an end wall of a cylindrical battery shell, a sealing hole 122 is provided on the outer surface of the end cover 12, the sealing hole 122 is a circular sinking hole, a side wall 11 of the sealing hole 122 is a conical structure, a liquid injection hole 121 is provided on the bottom surface of the sealing hole 122, the liquid injection hole 121 is a circular through hole, the liquid injection hole 121 is concentrically arranged with the sealing hole 122, the sealing nail 2 is installed at the liquid injection hole 121, and the cover plate 3 is installed at the sealing hole 122.
[0028] Reference Figure 1 and Figure 2The sealing nail 2 is a metal structure, including an integrally arranged nail head 21 and a nail column 22. The nail head 21 is a circular plate structure. The nail column 22 is arranged on one side surface of the nail head 21. The nail column 22 is penetrated into the injection hole 121. The nail head 21 is attached to the bottom surface of the sealing hole 122. The sealing nail 2 is fixedly connected to the side wall 11 of the injection hole 121 and the bottom surface of the sealing hole 122 by welding.
[0029] Reference Figure 1 and Figure 2 The cover plate 3 is a circular plate, and the side wall 11 of the cover plate 3 is a conical structure. The cover plate 3 is embedded in the sealing hole 122. A clearance groove 32 is provided on the surface of the cover plate 3 facing the injection hole 121. The clearance groove 32 is a circular groove used to make room for the nail head 21. The nail head 21 of the sealing nail 2 is located in the clearance groove 32. The surface of the cover plate 3 away from the injection hole 121 is the top surface 31, and the top surface 31 is flush with the surface of the end cover 12. A plurality of heat dissipation holes 33 are provided on the top surface 31 of the cover plate 3. The heat dissipation holes 33 are circular blind holes. The depth of the heat dissipation holes 33 is preferably half of the thickness of the cover plate 3, and the plurality of heat dissipation holes 33 are all around the outside of the clearance groove 32 for at least one circle. Preferably, the plurality of heat dissipation holes 33 are formed around the outside of the clearance groove 32 to form three circles. The heat dissipation holes 33 can fully release the residual thermal stress generated by the welding of the sealing nail 2, thereby helping to avoid welding cracks and improve the safety performance of the battery.
[0030] Reference Figure 1-3 The utility model discloses a cylindrical battery, including the above-mentioned sealing nail structure, and also includes a side wall 11 and a pole 4, wherein the side wall 11 and the end cover 12 together constitute a cylindrical shell 1 of the cylindrical battery, and the pole 4 is installed on the end cover 12 and is located on the same surface of the end cover 12 as the sealing hole 122.
[0031] The implementation principle and beneficial effect of the utility model are that, by adding a cover plate 3 to the sealing nail 2, a plurality of circles of heat dissipation holes 33 are arranged on the cover plate 3 on the upper side of the sealing nail 2. This hole-shaped structure can effectively and fully release the residual thermal stress generated by welding, which is conducive to preventing cracks from occurring at the weld, thereby improving the safety and performance of the battery. Therefore, the utility model solves the problem of insufficient release of residual thermal stress at the sealing position of the existing cylindrical battery injection hole 121.
[0032] The above is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.
Claims
1. A sealing nail structure, characterized in that: The invention comprises an end cover (12), a sealing pin (2) and a cover plate (3); the end cover (12) is provided with a sealing hole (122), the sealing hole (122) is a sink hole, the bottom surface of the sealing hole (122) is provided with a liquid injection hole (121), the sealing pin (2) is installed in the liquid injection hole (121), the cover plate (3) is installed in the sealing hole (122), and the cover plate (3) is provided with a plurality of heat dissipation holes (33), the heat dissipation holes (33) surround the sealing pin (2) for at least one circle.
2. The sealing nail structure according to claim 1, characterized in that: The sealing nail (2) comprises a nail head (21) and a nail column (22); the nail column (22) is inserted into the injection hole (121), and the nail head (21) is attached to the bottom surface of the sealing hole (122).
3. The sealing nail structure according to claim 2, characterized in that: The cover plate (3) is embedded in the sealing hole (122), and a clearance groove (32) is provided on the surface of the cover plate (3) facing the injection hole (121), and the nail head (21) is arranged in the clearance groove (32).
4. The sealing nail structure according to claim 3, characterized in that: The heat dissipation hole (33) surrounds the outer side of the clearance groove (32).
5. The sealing nail structure according to claim 1, characterized in that: The surface of the cover plate (3) facing away from the liquid injection hole (121) is flush with the surface of the end cover (12).
6. The sealing nail structure according to any one of claims 1 to 5, characterized in that: The heat dissipation holes (33) surround the sealing pin (2) three times.
7. The sealing nail structure according to any one of claims 1 to 5, characterized in that: The heat dissipation hole (33) is a blind hole.
8. The sealing nail structure according to claim 7, characterized in that: The depth of the heat dissipation hole (33) is half the thickness of the cover plate (3).
9. The sealing nail structure according to any one of claims 1 to 5, characterized in that: The side wall (11) of the sealing hole (122) is a conical structure, and the side wall (11) of the cover plate (3) is a conical structure.
10. A cylindrical battery, characterized in that: The sealing nail structure comprises any one of claims 1 to 9, and further comprises a side wall (11) and a pole (4), wherein the side wall (11) and the end cover (12) form a shell (1), the pole (4) is mounted on the end cover (12), and the pole (4) and the sealing hole (122) are located on the same surface of the end cover (12).