Square battery liquid injection hole structure
By designing an annular stress removal tank at the bottom of the liquid injection hole of the lithium-ion battery, the welding problem caused by thermal stress during welding is solved, the welding yield is improved, and the pores and cracks of the liquid injection hole are avoided.
Patent Information
- Application Number
- CN202420338209.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-22
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-02-22
AI Technical Summary
When welding sealing nails and injection holes, the temperature of existing lithium-ion batteries is as high as 700℃, resulting in welding stress in the welding area, which is prone to poor welding problems such as pores and cracks.
A square battery liquid injection hole structure is designed, with an annular stress removal groove open at the bottom of the liquid injection hole to relieve thermal stress during welding.
Through the design of the annular stress removal groove, the thermal stress during welding can be alleviated, the welding yield will be improved, and the defective problems such as pores and cracks in the liquid injection holes will be avoided.
Smart Images
Figure CN222601327U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of lithium ion batteries, and in particular relates to a square battery liquid injection hole structure. Background Art
[0002] Lithium-ion batteries have the advantages of high mass-to-energy ratio, long service life, high rated voltage, low self-discharge rate, and environmental protection, so they are widely used in portable electronic devices and electric vehicles. Usually, after the aluminum shell battery is filled with liquid, it is necessary to insert the sealing aluminum sheet into the liquid injection hole, and then perform laser welding to seal the battery; but when the existing sealing nails and the liquid injection hole are welded, the temperature is as high as 700℃. When the welding is completed, the welding area usually has residual welding stress, which will cause poor welding problems such as pores and cracks. Utility Model Content
[0003] The utility model aims to provide a square battery liquid injection hole structure to solve the above problems existing in the prior art.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A square battery injection hole structure comprises a sealing aluminum sheet and an injection hole, wherein a sealing aluminum sheet mounting groove for matching and sealing the sealing aluminum sheet is provided at the upper portion of the injection hole, and an injection through hole connected to the sealing aluminum sheet mounting groove is provided at the lower portion of the injection hole; an annular stress relief groove located outside the injection through hole is also provided at the lower portion of the injection hole.
[0006] As a preferred technical solution in the utility model, the sealing aluminum sheet installation groove is coaxially arranged with the liquid injection through hole.
[0007] As a preferred technical solution in the utility model, the inner diameter of the sealing aluminum sheet installation groove is larger than the inner diameter of the liquid injection through hole.
[0008] As a preferred technical solution in the present invention, the inner wall of the sealing aluminum sheet installation groove is a slope structure that makes the opening of the sealing aluminum sheet installation groove gradually smaller from top to bottom.
[0009] As a preferred technical solution in the present invention, the annular stress relief groove is coaxially arranged with the sealing aluminum sheet installation groove.
[0010] As a preferred technical solution in the utility model, the diameter of the circular ring where the inner wall of the annular stress relief groove is located is larger than the inner diameter of the sealing aluminum sheet installation groove.
[0011] As a preferred technical solution in the present invention, an inner groove is provided at the lower end of the sealing aluminum sheet.
[0012] Beneficial effects: The utility model has an annular stress relief groove located outside the injection through hole at the lower part of the injection hole. When the sealed aluminum sheet is welded, the annular stress relief groove can relieve the thermal stress generated during welding due to thermal expansion and contraction with temperature changes, thereby improving the welding yield and avoiding problems such as pores and cracks in the injection hole. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the structure of the utility model before the sealing aluminum sheet is installed;
[0014] Figure 2 It is a cross-sectional view of the utility model;
[0015] Figure 3 It is a cross-sectional view of the sealing aluminum sheet in the utility model;
[0016] Figure 4 It is a cross-sectional view of the liquid injection hole structure in the utility model.
[0017] 1-sealing aluminum sheet; 11-inclined surface; 2-liquid injection hole; 21-sealing aluminum sheet mounting groove; 22-liquid injection through hole; 23-annular stress relief groove. DETAILED DESCRIPTION
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the utility model will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation of the utility model.
[0019] Example:
[0020] like Figure 1-Figure 4 As shown, the present embodiment provides a square battery injection hole structure, including a sealing aluminum sheet 1 and an injection hole 2, wherein a sealing aluminum sheet mounting groove 21 for matching and sealing with the sealing aluminum sheet 1 is provided at the upper portion of the injection hole 2, and an injection through hole 22 connected with the sealing aluminum sheet mounting groove 21 is provided at the lower portion of the injection hole 2 to facilitate injection. After the injection is completed, the sealing aluminum sheet 1 can be installed in the sealing aluminum sheet mounting groove 21, and then laser welding is performed to seal the battery; an annular stress relief groove 23 located outside the injection through hole 22 is also provided at the lower portion of the injection hole 2. When the sealing aluminum sheet 1 is welded, it expands and contracts with changes in temperature, and the annular stress relief groove 23 can relieve the thermal stress generated during welding, thereby improving the welding yield.
[0021] The utility model is provided with an annular stress relief groove 23 located outside the injection through hole 22 at the lower part of the injection hole 2. When the sealed aluminum sheet 1 is welded, it expands and contracts with the change of temperature. The annular stress relief groove 23 can relieve the thermal stress generated during welding, thereby improving the welding yield and avoiding the occurrence of pores, cracks and other undesirable problems in the injection hole.
[0022] As a preferred implementation scheme in this embodiment, it needs to be further explained that the sealing aluminum sheet installation groove 21 and the injection through hole 22 are coaxially arranged, which can make the production of the injection hole 2 simpler.
[0023] As a preferred technical solution in the present invention, the inner diameter of the sealing aluminum sheet installation groove 21 is larger than the inner diameter of the liquid injection hole 22, ensuring that the liquid injection hole 22 can be completely blocked after the sealing aluminum sheet 1 is installed. At the same time, it can also ensure that the sealing aluminum sheet 1 will not fall into the liquid injection hole 22, thereby improving the relative stability during welding.
[0024] As a preferred technical solution in the present invention, the inner wall of the sealing aluminum sheet installation groove 21 is a slope structure that makes the opening of the sealing aluminum sheet installation groove 21 gradually smaller from top to bottom, which can make the installation of the sealing aluminum sheet 1 easier.
[0025] As a preferred technical solution in the present invention, the annular stress relief groove 23 is coaxially arranged with the sealing aluminum sheet installation groove 21, so that when welding the sealing aluminum sheet 1, the distance between the annular stress relief groove 23 and each position of the welding point is the same, so that stress at each position can be effectively buffered to ensure the best buffering effect.
[0026] As a preferred technical solution in the utility model, the diameter of the circular ring where the inner wall of the annular stress relief groove 23 is located is larger than the inner diameter of the sealing aluminum sheet mounting groove 21, so that the annular stress relief groove 23 is matched with the liquid injection through hole 22. The annular stress relief groove 23 is located on the outside of the welding point, and the liquid injection through hole 22 is located on the inside of the welding point. The inside and outside cooperate with each other, and the buffering effect is better.
[0027] As a preferred technical solution in the present invention, an inner groove is provided at the lower end of the sealing aluminum sheet 1, so that the sealing aluminum sheet 1 itself can buffer a certain amount of thermal stress during welding, thereby further improving the welding yield.
[0028] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A square battery injection hole structure, characterized in that: The invention comprises a sealing aluminum sheet (1) and a liquid injection hole (2); the upper part of the liquid injection hole (2) is provided with a sealing aluminum sheet mounting groove (21) for matching and sealing with the sealing aluminum sheet (1); the lower part of the liquid injection hole (2) is provided with a liquid injection through hole (22) connected with the sealing aluminum sheet mounting groove (21); the lower part of the liquid injection hole (2) is also provided with an annular stress relief groove (23) located outside the liquid injection through hole (22).
2. A square battery filling hole structure according to claim 1, characterized in that: The sealing aluminum sheet installation groove (21) is coaxially arranged with the liquid injection through hole (22).
3. A square battery injection hole structure according to claim 2, characterized in that: The inner diameter of the sealing aluminum sheet installation groove (21) is greater than the inner diameter of the liquid injection through hole (22).
4. A square battery liquid injection hole structure according to claim 3, characterized in that: The inner wall of the sealing aluminum sheet installation groove (21) is a slope structure such that the opening of the sealing aluminum sheet installation groove (21) gradually becomes smaller from top to bottom.
5. A square battery filling hole structure according to any one of claims 1 to 3, characterized in that: The annular stress relief groove (23) is coaxially arranged with the sealing aluminum sheet installation groove (21).
6. A square battery liquid injection hole structure according to claim 5, characterized in that: The diameter of the circular ring where the inner wall of the annular stress relief groove (23) is located is larger than the inner diameter of the sealing aluminum sheet installation groove (21).
7. A square battery liquid injection hole structure according to claim 1, characterized in that: The lower end of the sealing aluminum sheet (1) is provided with an inner groove.