Explosion-proof cylindrical battery

Abstract

The utility model discloses an explosion-proof cylindrical battery which comprises a shell and a bottom cover sealed at the bottom end of the shell, the bottom cover comprises a disc main body and a safety valve, the disc main body and the safety valve are integrally connected, and the safety valve is arranged in the center of the disc main body; the connecting part of the disc main body and the safety valve is thinner than the disc main body; a liquid injection hole is formed in the center of the safety valve; and the shell is an aluminum shell. According to the utility model, the integrated connection of the safety valve plate and the battery bottom cover is realized, and the battery shell has the function of a positive collector plate, so that a positive collector plate structure is omitted. In the design, the connecting area of the safety valve plate and the battery bottom cover is subjected to special weakness treatment, so that the safety valve can quickly respond and release pressure when needed, and the overall structure of the battery is simplified. In addition, the integrated production mode not only improves the production efficiency, but also enables the manufacturing process of the battery to be simpler, more convenient and quicker.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to an explosion-proof cylindrical battery. Background Art

[0002] As the penetration rate of new energy electric vehicles increases, the problems of insufficient range and slow single-charge speeds are becoming increasingly prominent. Both electric vehicle and battery manufacturers are working on various aspects of battery fast charging to address user concerns about charging speeds. In existing technology, battery safety valves are typically sealed and connected to the battery bottom or top cover through welding or riveting, resulting in low structural integration and a complex assembly process, which seriously affects production efficiency. Utility Model Content

[0003] The purpose of this utility model is to provide an explosion-proof cylindrical battery that achieves an integrated connection between the safety valve plate and the battery bottom cover. The bottom cover also functions as a positive electrode collector plate, eliminating the need for a positive electrode collector plate structure. In this design, the connection area between the safety valve plate and the battery bottom cover undergoes special weakening treatment, ensuring that the safety valve can quickly respond and release pressure when needed while simplifying the overall battery structure. Furthermore, this integrated production method not only improves production efficiency but also makes the battery manufacturing process simpler and faster.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] The utility model discloses an explosion-proof cylindrical battery, comprising a shell and a bottom cover sealed to the bottom end of the shell, wherein:

[0006] The bottom cover comprises an integrally connected disc body and a safety valve arranged in the center of the disc body; the thickness of the connection between the disc body and the safety valve is smaller than the thickness of the disc body; and a liquid injection hole is opened in the center of the safety valve;

[0007] The shell is an aluminum shell.

[0008] A further solution is that the disc body is circumferentially provided with a plurality of welding areas protruding toward the shell.

[0009] A further solution: the welding area is fan-shaped, and the number of the welding areas is not less than two.

[0010] A further solution: the middle portion of the safety valve is arranged to protrude in the opposite direction of the shell.

[0011] A further solution: a center hole is opened at the top of the shell, and a negative electrode column is arranged in the center hole.

[0012] A further solution is that the top wall of the shell is against an insulating sheet.

[0013] A further solution: the negative electrode post is sealed and connected to the edge of the central hole via a sealing ring.

[0014] A further solution: the shell and the bottom cover are connected by laser welding.

[0015] A further solution: a winding core is provided in the shell, and a negative electrode current collecting disk is provided between the winding core and the insulating sheet.

[0016] A further solution: the upper cover of the liquid injection hole is provided with a sealing sheet.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This utility model achieves an integrated connection between the safety valve plate and the battery bottom cover. The connection area has undergone special weakening treatment, ensuring that the safety valve can quickly respond and release pressure when needed, while also simplifying the overall battery structure. The bottom cover not only seals the entire battery cell, but also serves as a current collector, injection port, and safety valve. Furthermore, this integrated production method not only improves assembly efficiency but also makes the battery manufacturing process simpler and faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a side sectional view of the utility model;

[0020] Figure 2 This is a schematic structural diagram of the bottom cover of the utility model;

[0021] In the figure: 1-shell, 11-center hole, 2-bottom cover, 21-disc body, 211-welding area, 22-safety valve, 23-liquid injection hole, 3-negative pole, 4-insulating sheet, 5-sealing ring, 6-winding core, 7-negative current collecting disc, 8-sealing sheet. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the product of the present invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0024] See also Figure 1-2 In this embodiment, an explosion-proof cylindrical battery includes a housing 1 and a bottom cover 2 sealed to the bottom end of the housing 1, wherein: the bottom cover 2 includes an integrally connected disc body 21 and a safety valve 22 provided at the center of the disc body 21; the thickness of the connection between the disc body 21 and the safety valve 22 is 1 / 2-1 / 3 of the thickness of the disc body 21; a liquid injection hole 23 is provided at the center of the safety valve 22; the housing 1 is an aluminum shell, which carries a positive charge, and the bottom cover 2 also serves as a positive electrode current collecting disk, eliminating the positive electrode current collecting disk structure.

[0025] Furthermore, the disc body 21 is circumferentially arranged with a plurality of welding areas 211 protruding toward the shell 1 , so as to facilitate matching with the winding core tabs inside the battery cell and performing laser penetration welding connection.

[0026] Furthermore, the welding area is fan-shaped, and the number of the welding areas 211 is not less than two. In this embodiment, four welding areas 211 are provided to improve welding reliability.

[0027] Furthermore, the middle portion of the safety valve 22 is protruded in the opposite direction of the housing 1. The outwardly protruding safety valve 22 can form a larger channel when opened, which is conducive to the rapid discharge of gas and electrolyte, and prevents the battery from exploding due to excessive internal pressure.

[0028] Furthermore, a central hole 11 is opened at the top of the shell 1, and a negative pole 3 is arranged in the central hole 11; an insulating sheet 4 is abutted against the top wall of the shell 1; and the negative pole 3 is sealed to the edge of the central hole 11 through a sealing ring 5.

[0029] Furthermore, the housing 1 and the bottom cover 2 are connected by laser welding to improve the sealing and connection reliability.

[0030] Furthermore, a winding core 6 is provided in the housing 1 , and a negative electrode current collecting disc 7 is provided between the winding core 6 and the insulating sheet 4 .

[0031] Furthermore, a sealing sheet 8 is provided on the upper cover of the liquid injection hole 23 .

[0032] During assembly, the negative electrode current collecting disc 7 and the bottom cover 2 are first electrically connected to the winding core 6 respectively, and then the whole is installed in the shell 1. The negative electrode post 3 is connected to the negative electrode current collecting disc 7 by laser penetration welding on the outside of the negative electrode post 3. At the same time, the bottom cover 2 is laser welded to the shell 1, so that the aluminum shell 1 is positively charged and the negative electrode post 3 is negatively charged.

[0033] Although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0034] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent modifications made according to the scope of the claims of the present application are within the scope of protection of the claims of the present application.

Claims

1. An explosion-proof cylindrical battery, comprising a housing (1) and a bottom cover (2) sealed to the bottom end of the housing (1), characterized in that: The bottom cover (2) comprises an integrally connected disc body (21) and a safety valve (22) arranged at the center of the disc body (21); the thickness of the connection between the disc body (21) and the safety valve (22) is smaller than the thickness of the disc body (21); and a liquid injection hole (23) is provided at the center of the safety valve (22); The housing (1) is an aluminum shell.

2. The explosion-proof cylindrical battery according to claim 1, characterized in that: The disc body (21) is circumferentially provided with a plurality of welding areas (211) protruding toward the housing (1).

3. The explosion-proof cylindrical battery according to claim 2, characterized in that: The welding area (211) is fan-shaped, and the number of the welding areas (211) is no less than two.

4. The explosion-proof cylindrical battery according to claim 1, characterized in that: The middle portion of the safety valve (22) is arranged to protrude in the opposite direction of the housing (1).

5. The explosion-proof cylindrical battery according to claim 1, characterized in that: A central hole (11) is provided at the top end of the shell (1), and a negative pole (3) is provided in the central hole (11).

6. The explosion-proof cylindrical battery according to claim 1, characterized in that: The top wall of the housing (1) is supported by an insulating sheet (4).

7. The explosion-proof cylindrical battery according to claim 5, characterized in that: The negative electrode pole (3) is sealed and connected to the edge of the central hole (11) via a sealing ring (5).

8. The explosion-proof cylindrical battery according to claim 1, characterized in that: The housing (1) and the bottom cover (2) are connected by laser welding.

9. The explosion-proof cylindrical battery according to claim 5, characterized in that: A winding core (6) is provided in the housing (1), and a negative electrode current collecting disk (7) is provided between the winding core (6) and the insulating sheet (4).

10. The explosion-proof cylindrical battery according to claim 1, characterized in that: The liquid injection hole (23) is covered with a sealing sheet (8).

Images