Battery sealing structure and cylindrical battery

Abstract

The battery sealing structure comprises a shell and a fastening piece, the shell is of a cylindrical structure, one end of the shell is provided with an installation opening, the shell is provided with a flange at the installation opening, the side wall of the shell is provided with a rolling groove, the rolling groove surrounds the shell, and the fastening piece is arranged on the rolling groove. A sealing groove is formed between the rolling groove and the flange; a fastening groove is formed in the outer wall of the shell, the fastening groove corresponds to the sealing groove, and the fastening groove is formed around the shell; the fastening piece is of an annular structure, and the fastening piece is installed at the position of the fastening groove. The cylindrical battery provided by the utility model comprises the battery sealing structure. According to the cylindrical battery, the fastening groove is formed in the opening of the cylindrical battery shell, and the annular fastening piece is arranged in the fastening groove, so that the problems that the sealing part of the conventional cylindrical battery is easy to deform, the structural strength is low, and the sealing is easy to fail are solved.

Description

Technical Field

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

[0002] The shell of cylindrical batteries is generally made of steel or aluminum. After installing the battery cells and other components, the shell needs to be encapsulated. The encapsulation method is generally to produce mechanical deformation at the opening by rolling, so as to seal and lock the battery cap and other components in place.

[0003] However, the existing cylindrical batteries with metal shells have limited strength. During long-term use of the battery, the deformation of the seal of the shell can easily return to its original state due to external forces in the environment, temperature changes and other factors, thereby making the sealing effect of the shell on the cap and other components ineffective, resulting in leakage, cap falling off and other problems. In addition, after the opening of the cylindrical battery is rolled, the rolling position will become thinner, resulting in reduced strength of the seal, easy deformation and damage, and thus the risk of leakage.

[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 battery sealing structure and a cylindrical battery to solve the problems of easy deformation, low structural strength and easy sealing failure at the sealing portion of the existing cylindrical battery.

[0006] The utility model discloses a battery sealing structure, comprising a shell and a fastener, wherein the shell is a cylindrical structure, one end of the shell is provided with a mounting opening, the shell is provided with a rib at the mounting opening, a rolling groove is provided on the side wall of the shell, the rolling groove surrounds the shell, and a sealing groove is formed between the rolling groove and the rib; a fastening groove is provided on the outer wall of the shell, the fastening groove corresponds to the sealing groove, and the fastening groove is provided around the shell; the fastener is an annular structure, and the fastener is installed at the fastening groove.

[0007] Preferably, the rolling groove is a groove, and the recessed direction is toward the interior of the shell; the fastening groove is a groove, and the recessed direction is toward the interior of the shell.

[0008] Preferably, the width of the fastening groove is smaller than the width of the sealing groove.

[0009] Preferably, the fastening groove has a depth of 0.01 to 2 mm and a width of 0.5 to 4 mm.

[0010] Preferably, the fastener has a thickness of 0.01 to 2 mm and a width of 0.5 to 4 mm.

[0011] Preferably, a sealing member and a cover cap are installed in the sealing groove, the sealing member is annular, the cover cap is embedded in the sealing member, and the sealing member is arranged between the housing and the cover cap.

[0012] Preferably, the sealing member is an elastic insulating member.

[0013] Preferably, the fastener is made of metal or organic polymer.

[0014] Preferably, the material of the fastener includes steel, copper and alloy.

[0015] The utility model discloses a cylindrical battery, comprising any one of the above-mentioned battery sealing structures.

[0016] The beneficial effects of the utility model are:

[0017] By providing a fastening groove at the opening of the cylindrical battery shell and providing an annular fastener in the fastening groove, the fastener can tighten the shell at the opening of the shell. When the shell is deformed due to environmental factors, the deformation of the shell at the opening will be resisted by the fastener, which is conducive to avoiding sealing failure due to deformation and improving the structural strength of the shell.

[0018] Therefore, the utility model solves the problems of easy deformation, low structural strength and easy sealing failure at the sealing part of the existing cylindrical battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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:

[0020] Figure 1 is a schematic diagram of the structure of the shell;

[0021] Figure 2 It is a schematic diagram of the structure of the housing, the cap and the seal;

[0022] Figure 3 It is a schematic diagram of the overall structure of the utility model.

[0023] Explanation of the reference numerals: 1. Shell; 101. Mounting port; 11. Rolling groove; 12. Retaining edge; 13. Sealing groove; 14. Fastening groove; 2. Cover cap; 3. Sealing member; 4. Fastener. DETAILED DESCRIPTION

[0024] 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:

[0025] Reference Figure 1-3 , is a battery sealing structure disclosed in the utility model, comprising a shell 1, a cap 2, a seal 3 and a fastener 4, wherein the shell 1 is a metal cylindrical structure, one end of the shell 1 is open and the other end is closed, the open end of the shell 1 is an installation port 101, and the battery cell (not shown in the figure) is installed inside the shell 1 through the installation port 101. The shell 1 is provided with a rib 12 at the edge of the installation port 101. The rib 12 is an annular structure. The rib 12 is a bending structure formed relative to the side wall of the shell 1. The rib 12 is made by rolling or the like, and is used to limit the components inside the shell 1.

[0026] Reference Figure 1-3 A rolling groove 11 is provided on the side wall of the shell 1 near the installation opening 101. The rolling groove 11 is an annular groove. The concave direction of the rolling groove 11 is toward the inside of the shell 1. The rolling groove 11 surrounds the outer wall of the shell 1. The rolling groove 11 is used to limit the cap 2 and the seal 3, and is convenient for fixing the position of the shell 1 during battery production and processing; an annular sealing groove 13 is formed between the rolling groove 11 and the retaining edge 12. The sealing groove 13 is inside the shell 1 and is used for installation and positioning of the seal 3 and the cap 2.

[0027] Reference Figure 1-3 A fastening groove 14 is also provided on the outer wall of the shell 1. The fastening groove 14 is located at the sealing groove 13 and corresponds to the inside and outside of the sealing groove 13. The concave direction of the fastening groove 14 faces the inside of the shell 1. The width of the fastening groove 14 is smaller than the width of the sealing groove 13. The fastening groove 14 is annular around the shell 1. The seal 3 and the cap 2 are both installed at the sealing groove 13, wherein the seal 3 is an annular structure, and the cross-section of the seal 3 is a U-shaped groove structure. The cap 2 is a circular structure, and the edge of the cap 2 is inserted into the groove formed by the seal 3. The outer ring of the seal 3 is against the inner wall of the sealing groove 13. The seal 3 is elastic and is an insulating member, which can achieve insulation between the cap 2 and the shell 1, and seal the shell 1 together with the cap 2.

[0028] Reference Figure 1-3The fastener 4 is an annular sheet, which is sleeved on the outer periphery of the shell 1 and embedded in the fastening groove 14. A pre-tightening force is set between the fastener 4 and the outer wall of the shell 1, so that the fastener 4 can tighten the opening of the shell 1, so that the cap 2 and the seal 3 can be more firmly installed at the installation port 101 of the shell 1. In addition, since the fastener 4 applies a pre-tightening force at the installation port 101 of the shell 1, when the shell 1 near the installation port 101 undergoes restorative deformation due to the mechanical memory of the metal, the fastener 4 can resist the deformation of the shell 1, thereby avoiding the problem of poor sealing of the shell 1 to a certain extent; specifically, the depth of the fastening groove 14 is between 0.01 and 2 mm, and the width is between 0.5 and 4 mm; the thickness of the fastener 4 is between 0.01 and 2 mm, and the width is between 0.5 and 4 mm.

[0029] Reference Figure 1-3 Preferably, the fastener 4 is made of metal materials, including steel, copper and alloys, or made of organic polymers, including rubber.

[0030] The utility model also discloses a cylindrical battery, comprising the battery sealing structure mentioned above.

[0031] The implementation principle and beneficial effects of the utility model are as follows: by arranging a fastening groove 14 at the opening of the cylindrical battery shell, and arranging an annular fastener 4 in the fastening groove 14, the fastener 4 can tighten the shell at the opening of the shell, and when the shell is deformed due to environmental factors, the deformation of the shell at the opening will be resisted by the fastener 4, which is conducive to avoiding sealing failure due to deformation and improving the structural strength of the shell; therefore, the utility model solves the problems of easy deformation, low structural strength and easy sealing failure at the existing cylindrical battery seal.

[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 battery sealing structure, It is characterized in that The invention comprises a shell (1) and a fastener (4), wherein the shell (1) is a cylindrical structure, one end of the shell (1) is provided with a mounting opening (101), the shell (1) is provided with a retaining edge (12) at the mounting opening (101), a rolling groove (11) is provided on the side wall of the shell (1), the rolling groove (11) surrounds the shell (1), and a sealing groove (13) is formed between the rolling groove (11) and the retaining edge (12); A fastening groove (14) is provided on the outer wall of the shell (1), the fastening groove (14) corresponds to the sealing groove (13), and the fastening groove (14) is provided around the shell (1); the fastener (4) is an annular structure, and the fastener (4) is installed at the fastening groove (14).

2. The battery sealing structure according to claim 1, It is characterized in that The rolling groove (11) is a groove, and the recessed direction is toward the interior of the shell (1); the fastening groove (14) is a groove, and the recessed direction is toward the interior of the shell (1).

3. The battery sealing structure according to claim 2, It is characterized in that The width of the fastening groove (14) is smaller than the width of the sealing groove (13).

4. The battery sealing structure according to any one of claims 1 to 3, It is characterized in that The fastening groove (14) has a depth of 0.01 to 2 mm and a width of 0.5 to 4 mm.

5. The battery sealing structure according to claim 4, It is characterized in that The thickness of the fastener (4) is between 0.01 and 2 mm, and the width is between 0.5 and 4 mm.

6. The battery sealing structure according to any one of claims 1 to 3, It is characterized in that A sealing member (3) and a cover cap (2) are installed in the sealing groove (13); the sealing member (3) is annular, the cover cap (2) is embedded in the sealing member (3), and the sealing member (3) is arranged between the housing (1) and the cover cap (2).

7. The battery sealing structure according to claim 6, It is characterized in that The sealing member (3) is an elastic insulating member.

8. The battery sealing structure according to any one of claims 1 to 3, It is characterized in that The material of the fastener (4) is metal or organic polymer.

9. The battery sealing structure according to claim 7, It is characterized in that The material of the fastener (4) includes steel, copper and alloy.

10. A cylindrical battery, It is characterized in that The invention comprises the battery sealing structure described in any one of claims 1 to 9.

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