Cylindrical battery sealing and limiting structure

The cylindrical battery sealing and limiting structure with annular sealing portions and strip-shaped protrusions addresses the issue of inconsistent compression rates, stabilizing the seal and preventing leakage in cylindrical batteries.

CN222190965UActive Publication Date: 2024-12-17DONGGUAN CHAM BATTERY TECH CO LTD
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Patent Information

Application Number
CN202323659227.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-12-29
Publication Date
2024-12-17
Estimated Expiration
2033-12-29

AI Technical Summary

Technical Problem

The mechanical (rolling groove) sealing structure of cylindrical batteries often results in inconsistent circumferential compression rates, leading to potential air tightness issues and leakage due to relative movement of components during vibration or testing, compromising the sealing integrity.

Method used

A cylindrical battery sealing and limiting structure featuring annular sealing portions with strip-shaped protrusions on the inner and outer surfaces of the top cover and shell, ensuring consistent compression by supporting the shell and top cover, thereby stabilizing the sealing structure.

Benefits of technology

Ensures consistent circumferential compression rates and prevents leakage by maintaining the stability of the sealing structure under vibration or roller testing conditions.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a cylindrical battery sealing and limiting structure which comprises a shell, a top cover and a sealing piece arranged between the shell and the top cover, the sealing piece comprises an annular first sealing part, and the first sealing part is arranged around the peripheral wall of the top cover and located between the peripheral wall of the top cover and the inner wall of the shell. At least three first strip-shaped protrusions are evenly arranged on the outer side face, facing the shell, of the first sealing part in the circumferential direction, and at least three second strip-shaped protrusions are evenly arranged on the inner side face, facing the top cover, of the first sealing part in the circumferential direction. The first strip-shaped protrusions abut against the inner wall of the shell, and the second strip-shaped protrusions abut against the peripheral wall of the top cover, so that the top cover is connected to the shell in a central sealing mode. The first strip-shaped protrusions support the inner wall of the shell, and the second strip-shaped protrusions support the peripheral wall of the edge of the top cover, so that an assembly gap is filled, and the consistency of the circumferential compression ratio of the sealing piece is ensured.
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Description

Technical Field

[0001] The utility model relates to the field of cylindrical batteries, in particular to a cylindrical battery sealing and limiting structure. Background Art

[0002] At present, lithium-ion / sodium-ion cylindrical batteries have gradually become the mainstream products in the new energy industry due to their high energy density, good capacity consistency, and support for high-rate charging and discharging. More and more manufacturers are choosing cylindrical battery mechanical (rolling groove) sealing structure to reduce costs and increase production capacity. Common problems: 1. The mechanical (rolling groove) sealing structure of cylindrical batteries generally selects clearance fit to facilitate the assembly of the seal with the shell mouth and the top cover, which may easily cause the top cover to be offset relative to the seal or the seal to be offset relative to the shell mouth, resulting in poor consistency in the circumferential compression rate of the seal, affecting the air tightness of the power battery and even leakage; 2. For cylindrical power batteries with mechanical (rolling groove) sealing structure, when they are loaded for long-term vibration or roller testing, the rolling groove sealing structure is prone to instability, that is, the seal or the top cover moves relative to each other, destroying the compression rate of the seal, affecting the air tightness of the battery, and causing battery leakage. Summary of the invention

[0003] The utility model aims to provide a cylindrical battery sealing limit structure to improve the consistency of the circumferential compression rate of the sealing member.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a cylindrical battery sealing and limiting structure, including a shell, a top cover and a sealing member arranged between the shell and the top cover, the sealing member including an annular first sealing portion, the first sealing portion being arranged around the peripheral wall of the top cover and being located between the peripheral wall of the top cover and the inner wall of the shell, the first sealing portion having at least three first strip-shaped protrusions evenly arranged along the circumferential direction on the outer side surface of the shell facing the first sealing portion, and at least three second strip-shaped protrusions evenly arranged along the circumferential direction on the inner side surface of the top cover facing the first sealing portion, the first strip-shaped protrusions being pressed against the inner wall of the shell and the second strip-shaped protrusions being pressed against the peripheral wall of the top cover so that the top cover is centrally and sealedly connected to the shell.

[0005] Preferably, the first strip-shaped protrusions and the second strip-shaped protrusions both extend along the axial direction of the first sealing portion, and the at least three first strip-shaped protrusions and the at least three second strip-shaped protrusions are evenly spaced in the circumferential direction of the first sealing portion.

[0006] Preferably, the shell includes a groove portion and a fixing portion arranged on the upper part of the groove portion and connected to the groove portion, the fixing portion includes a first fixing portion and a second fixing portion, the first fixing portion is connected to the groove portion and the first fixing portion is vertically arranged, the second fixing portion is formed by bending the upper end of the shell toward the inner side of the shell to be fixed on the upper end surface of the top cover, the sealing member also includes a third sealing portion and a fourth sealing portion, the first sealing portion, the third sealing portion and the fourth sealing portion are connected integrally in sequence, the third sealing portion is arranged between the upper surface of the inner wall of the groove portion and the lower end surface of the top cover, and the fourth sealing portion is arranged on the bending portion of the inner wall of the groove portion.

[0007] Preferably, the sealing member further comprises a second sealing portion, the second sealing portion, the first sealing portion, the third sealing portion and the fourth sealing portion are integrally connected in sequence, and the second sealing portion is arranged between the second fixing portion and the upper end surface of the top cover.

[0008] Preferably, in an uninstalled state, the first sealing portion and the second sealing portion are both arranged vertically, the first sealing portion and the second sealing portion are both arranged on one side of the third sealing portion, and the fourth sealing portion is arranged on the other side of the third sealing portion.

[0009] Preferably, the width of the first strip-shaped protrusion along the radial direction of the first sealing portion is greater than or equal to 0.03 mm and less than or equal to 0.2 mm, and the height of the first strip-shaped protrusion along the axial direction of the first sealing portion is greater than or equal to 0.5 mm and less than or equal to 2.5 mm.

[0010] Preferably, the width of the second strip-shaped protrusion along the radial direction of the first sealing portion is greater than or equal to 0.03 mm and less than or equal to 0.2 mm, and the height of the second strip-shaped protrusion along the axial direction of the first sealing portion is greater than or equal to 1.0 mm and less than or equal to 2.0 mm.

[0011] Compared with the prior art, the utility model arranges at least three first strip-shaped protrusions on the outer side surface of the first sealing part and at least three second strip-shaped protrusions on the inner side surface of the first sealing part, so that the first strip-shaped protrusions support the inner wall of the shell and the second strip-shaped protrusions support the edge peripheral wall of the top cover, thereby filling the assembly gap and ensuring the consistency of the circumferential compression rate of the seal; when loaded with a vehicle for long-term vibration or roller test, the seal, the shell and the top cover are limited by the first strip-shaped protrusions and the second strip-shaped protrusions, which can ensure the stability of the sealing structure, avoid destroying the compression rate of the seal, and completely avoid the occurrence of leakage of cylindrical power batteries with mechanical sealing structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1It is a structural diagram of the top cover, the sealing member and the housing of the embodiment of the utility model when not assembled.

[0013] Figure 2 It is a cross-sectional structural diagram of the top cover, the sealing member and the housing when the embodiment of the utility model is not assembled.

[0014] Figure 3 It is a structural diagram of the sealing member of the embodiment of the utility model when it is not assembled.

[0015] Figure 4 It is a top view of the sealing member of the embodiment of the utility model when it is not assembled.

[0016] Figure 5 for Figure 4 Cross-sectional structural diagram along the AA axis.

[0017] Figure 6 This is a structural diagram of the top cover, the sealing member and the shell after being assembled in the embodiment of the utility model. DETAILED DESCRIPTION

[0018] In order to explain the technical content, structural features and effects achieved by the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0019] like Figures 1 to 6 As shown, the embodiment of the utility model provides a cylindrical battery sealing and limiting structure, including a shell 1, a top cover 2, and a sealing member 3 disposed between the shell 1 and the top cover 2, the sealing member 3 including a first annular sealing portion 31, the first sealing portion 31 is disposed around the peripheral wall of the top cover 2 and is located between the peripheral wall of the top cover 2 and the inner wall of the shell 1, at least three first strip-shaped protrusions 311 are evenly disposed along the circumferential direction on the outer side surface of the first sealing portion 31 facing the shell 1, at least three second strip-shaped protrusions 312 are evenly disposed along the circumferential direction on the inner side surface of the first sealing portion 31 facing the top cover 2, the first strip-shaped protrusion 311 presses against the inner wall of the shell 1 and the second strip-shaped protrusion 312 presses against the peripheral wall of the top cover 2 so that the top cover 2 is centrally sealed and connected to the shell 1. Specifically, the shell 1 is a hollow cylindrical structure, and the upper end of the shell has an opening 13, the top cover 2 is circular, and the top cover 2 is used to close the opening 13 at the upper end of the shell 1.

[0020] In the embodiment of the utility model, at least three first strip-shaped protrusions 311 are arranged on the outer side surface of the first sealing part 31 and at least three second strip-shaped protrusions 312 are arranged on the inner side surface of the first sealing part 31, so that the first strip-shaped protrusions 311 support the inner wall of the shell 1 and the second strip-shaped protrusions 312 support the edge peripheral wall of the top cover 2, thereby filling the assembly gap and ensuring the consistency of the circumferential compression rate of the seal 3; when the vehicle is subjected to long-term vibration or roller testing, the seal 3, the shell 1 and the top cover 2 are limited by the first strip-shaped protrusions 311 and the second strip-shaped protrusions 312, which can ensure the stability of the sealing structure, avoid damaging the compression rate of the seal 3, and completely avoid the occurrence of leakage of cylindrical batteries with mechanical sealing structures.

[0021] In the embodiment of the utility model, the first strip-shaped protrusion 311 and the second strip-shaped protrusion 312 extend along the axial direction of the first sealing portion 31, and at least three first strip-shaped protrusions 311 and at least three second strip-shaped protrusions 312 are evenly spaced in the circumferential direction of the first sealing portion 31. Specifically, as Figure 3 As shown, when there are three first strip-shaped protrusions 311 and three second strip-shaped protrusions 312, the angle between adjacent first strip-shaped protrusions 311 and second strip-shaped protrusions 312 is 60 degrees, the angle between two adjacent first strip-shaped protrusions 311 is 120 degrees, and the angle between two adjacent second strip-shaped protrusions 312 is 120 degrees. Evenly spacing the first strip-shaped protrusions 311 and the second strip-shaped protrusions 312 is more conducive to the stability of the sealing member 3.

[0022] In the embodiment of the utility model, Figure 1 , Figure 2 and Figure 6 As shown, the shell 1 includes a groove portion 11 and a fixing portion 12 arranged on the upper portion of the groove portion 11 and connected to the groove portion 11, the fixing portion 12 includes a first fixing portion 121 and a second fixing portion 122, the first fixing portion 121 is connected to the groove portion 11 and the first fixing portion 121 is vertically arranged, the second fixing portion 122 is formed by bending the upper end of the shell 1 toward the inner side of the shell 1 to be fixed on the upper end surface of the top cover 2, the sealing member 3 also includes a third sealing portion 33 and a fourth sealing portion 34, the first sealing portion 31, the third sealing portion 33 and the fourth sealing portion 34 are connected in sequence as a whole, the third sealing portion 33 is arranged between the upper surface 111 of the inner wall of the groove portion 11 and the lower end surface of the top cover 2, and the fourth sealing portion 34 is arranged on the bending portion 112 of the inner wall of the groove portion 11. Specifically, the fixing portion 12 and the rolling groove portion 11 are arranged on the upper part of the shell 1, and the fixing portion 12 and the rolling groove portion 11 cooperate to confine the edge of the top cover 2 to the area between the fixing portion 12 and the rolling groove portion 11, and the top cover 2 is sealed and connected with the fixing portion 12 and the rolling groove portion 11 through the first sealing portion 31, the third sealing portion 33 and the fourth sealing portion 34.

[0023] In the embodiment of the utility model, Figure 6 As shown, the sealing member 3 further includes a second sealing portion 32, and the second sealing portion 32, the first sealing portion 31, the third sealing portion 33 and the fourth sealing portion 34 are integrally connected in sequence, and the second sealing portion 32 is arranged between the second fixing portion 122 and the upper end surface of the top cover 2. The second sealing portion 32 is arranged between the second fixing portion 122 and the upper end surface of the top cover 2 to further seal, and the sealing effect is good.

[0024] In the embodiment of the utility model, in the uninstalled state, the first sealing part 31 and the second sealing part 32 are both arranged vertically, the first sealing part 31 and the second sealing part 32 are both arranged on one side of the third sealing part 33, and the fourth sealing part 34 is arranged on the other side of the third sealing part 33. Specifically, as Figures 1 to 6 As shown, the first sealing portion 31 and the second sealing portion 32 are both vertically arranged, the third sealing portion 33 is horizontally arranged to match the upper surface 111 of the inner wall of the rolling groove portion 11, the third sealing portion 33 forms a platform position of the sealing member 3, and the fourth sealing portion 34 is vertically arranged to fit and seal with the inner wall of the bending portion 112 of the rolling groove portion 11.

[0025] In the embodiment of the utility model, the width of the first strip-shaped protrusion 311 along the radial direction of the first sealing portion 31 is greater than or equal to 0.03 mm and less than or equal to 0.2 mm, and the height of the first strip-shaped protrusion 311 along the axial direction of the first sealing portion 31 is greater than or equal to 0.5 mm and less than or equal to 2.5 mm. Figure 5 As shown, the height h of the first strip-shaped protrusion 311 along the axial direction of the first sealing portion 31 is smaller than the sum H of the heights of the first sealing portion 31 and the second sealing portion 32 in the axial direction.

[0026] In the embodiment of the utility model, the width of the second strip-shaped protrusion 312 along the radial direction of the first sealing portion 31 is greater than or equal to 0.03 mm and less than or equal to 0.2 mm, and the height of the second strip-shaped protrusion 312 along the axial direction of the first sealing portion 31 is greater than or equal to 1.0 mm and less than or equal to 2.0 mm. Figure 5 As shown, the width W of the second strip-shaped protrusion 312 in the radial direction is greater than or equal to 0.03 mm and less than or equal to 0.2 mm.

[0027] The assembly method of the housing 1, the top cover 2 and the sealing member 3 of the embodiment of the utility model is as follows: firstly, the top cover 2 and the sealing member 3 are adapted, that is, the top cover 2 is overlapped on the platform position of the sealing member 3, and the peripheral wall of the top cover 2 is snap-fitted with at least three second strip-shaped protrusions 312 on the inner side of the first sealing portion 31; the housing 1 is processed by a rolling groove process, and a rolling groove portion 11 and a fixing portion 12 are formed; then, the sealing member 3 of the assembled top cover 2 is inserted into the shell opening, adapted with the rolling groove portion 11 of the housing 1, and at least three first strip-shaped protrusions 311 on the outer side of the first sealing portion 31 are snap-fitted with the first fixing portion 121 of the fixing portion 12; the second fixing portion 122 is bent and the second sealing portion 32 is driven to bend so as to seal the top cover 2 and the housing 1. After assembly, the structure of the top cover 2, the housing 1 and the sealing member 3 is as follows: Figure 6 shown.

[0028] The above disclosure is only a preferred example of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A cylindrical battery sealing and limiting structure, It is characterized in that The invention comprises a shell, a top cover and a sealing member arranged between the shell and the top cover, wherein the sealing member comprises a first annular sealing portion, the first sealing portion is arranged around the peripheral wall of the top cover and is located between the peripheral wall of the top cover and the inner wall of the shell, at least three first strip-shaped protrusions are evenly arranged in the circumferential direction on the outer side surface of the first sealing portion facing the shell, at least three second strip-shaped protrusions are evenly arranged in the circumferential direction on the inner side surface of the first sealing portion facing the top cover, the first strip-shaped protrusions are pressed against the inner wall of the shell and the second strip-shaped protrusions are pressed against the peripheral wall of the top cover so that the top cover is centrally and sealedly connected to the shell.

2. The cylindrical battery sealing and limiting structure according to claim 1, It is characterized in that The first strip-shaped protrusions and the second strip-shaped protrusions both extend along the axial direction of the first sealing portion, and the at least three first strip-shaped protrusions and the at least three second strip-shaped protrusions are evenly spaced in the circumferential direction of the first sealing portion.

3. The cylindrical battery sealing and limiting structure according to claim 1, It is characterized in that The shell includes a groove portion and a fixing portion arranged on the upper part of the groove portion and connected to the groove portion, the fixing portion includes a first fixing portion and a second fixing portion, the first fixing portion is connected to the groove portion and the first fixing portion is vertically arranged, the second fixing portion is formed by bending the upper end of the shell toward the inner side of the shell to be fixed to the upper end surface of the top cover, the sealing member also includes a third sealing portion and a fourth sealing portion, the first sealing portion, the third sealing portion and the fourth sealing portion are connected integrally in sequence, the third sealing portion is arranged between the upper surface of the inner wall of the groove portion and the lower end surface of the top cover, and the fourth sealing portion is arranged on the bending portion of the inner wall of the groove portion.

4. The cylindrical battery sealing and limiting structure as claimed in claim 3, It is characterized in that The sealing member further includes a second sealing portion, wherein the second sealing portion, the first sealing portion, the third sealing portion and the fourth sealing portion are integrally connected in sequence, and the second sealing portion is arranged between the second fixing portion and the upper end surface of the top cover.

5. The cylindrical battery sealing and limiting structure as claimed in claim 4, It is characterized in that In an uninstalled state, the first sealing portion and the second sealing portion are both arranged vertically, the first sealing portion and the second sealing portion are both arranged on one side of the third sealing portion, and the fourth sealing portion is arranged on the other side of the third sealing portion.

6. The cylindrical battery sealing and limiting structure according to claim 2, It is characterized in that The width of the first strip-shaped protrusion along the radial direction of the first sealing portion is greater than or equal to 0.03 mm and less than or equal to 0.2 mm, and the height of the first strip-shaped protrusion along the axial direction of the first sealing portion is greater than or equal to 0.5 mm and less than or equal to 2.5 mm.

7. The cylindrical battery sealing and limiting structure according to claim 2, It is characterized in that The width of the second strip-shaped protrusion along the radial direction of the first sealing portion is greater than or equal to 0.03 mm and less than or equal to 0.2 mm, and the height of the second strip-shaped protrusion along the axial direction of the first sealing portion is greater than or equal to 1.0 mm and less than or equal to 2.0 mm.