Cylindrical battery

Abstract

The utility model relates to a cylindrical battery which comprises a shell, a roll core and a cover plate assembly, the first polarity of the roll core is electrically connected with the thinned area at the bottom of the shell through penetration welding, compared with a traditional large cylindrical battery, a first polarity connecting piece used for connecting the first polarity of the roll core with the shell and the welding step of the first polarity connecting piece are omitted, the structure is simple, the material cost is low, and the production efficiency is high; according to the cylindrical battery, the cover plate explosion-proof valve and the shell bottom explosion-proof valve are respectively arranged on the cover plate assembly and at the bottom of the shell, so that when the cylindrical battery is subjected to thermal runaway, high-temperature and high-pressure gas can be quickly discharged along the two ends of the roll core, the battery is prevented from exploding and igniting, and the safety of the battery is improved; the utility model has the advantages of simple structure, low cost, high production efficiency, and no explosion or fire in thermal runaway.

Description

Technical Field

[0001] This utility model belongs to the field of battery structure technology, specifically relating to a cylindrical battery. Background Technology

[0002] Lithium-ion or sodium-ion batteries have advantages such as light weight, large energy storage, high power, no pollution, long life, low self-discharge coefficient, and wide temperature adaptability, thus gradually gaining popularity and replacing other traditional batteries in the fields of energy storage and power batteries. Cylindrical batteries generally consist of a casing, core, cover plate assembly, and connecting tabs, with the core and casing or cover plate connected by the connecting tabs. This not only results in high material costs but also requires multiple welding processes, affecting production efficiency. Traditional cylindrical batteries typically have an explosion-proof valve at one end. However, for large cylindrical batteries, in the event of thermal runaway, this valve cannot effectively and promptly expel the high-temperature, high-pressure fumes inside the battery, making the battery highly susceptible to explosion and fire. Therefore, it is essential to provide a cylindrical battery that is simple in structure, low in cost, highly efficient in production, and does not explode or catch fire during thermal runaway. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cylindrical battery that is simple in structure, low in cost, high in production efficiency, and does not explode or catch fire during thermal runaway.

[0004] The purpose of this utility model is achieved as follows: a cylindrical battery includes a housing, a winding core, and a cover plate assembly. The housing is a barrel-shaped structure with one open side, the winding core is a cylindrical structure, the winding core is located inside the housing, and the cover plate assembly is located on one side end of the housing, so that the winding core and the housing are assembled and connected.

[0005] The shell includes a shell bottom, a shell cylindrical surface and a shell opening. Several thinning zones are distributed on the outer plane of the shell bottom, and the inner surface of the thinning zones is higher than the inner plane of the shell bottom.

[0006] An explosion-proof valve is also installed at the bottom of the housing.

[0007] The core has a body in the middle, one end of which is a first polarity and the other end is a second polarity. The body is fixed by wrapping with adhesive tape, and the second polarity is insulated from the outside by insulating tape, with the edge of the insulating tape higher than the outer surface of the second polarity.

[0008] The cover plate assembly consists of a second polarity connecting block, an upper insulating component, a light cover plate, a lower insulating component, and a second polarity connecting piece; the second polarity connecting block and the second polarity connecting piece are connected by pole posts.

[0009] The cover plate is equipped with an injection port and an explosion-proof valve.

[0010] The first polarity of the core is electrically connected to the thinning area at the bottom of the housing via through-welding. After the housing is welded to the cover plate assembly, the light cover plate is electrically connected to the first polarity.

[0011] The second polarity of the core is electrically connected to the second polarity connecting piece by welding, thereby electrically connecting the second polarity connecting block to the second polarity.

[0012] The cylindrical battery is provided with a cover plate explosion-proof valve and a housing bottom explosion-proof valve on the cover plate assembly and the bottom of the housing, respectively.

[0013] The beneficial effects of this utility model are as follows: This utility model is a cylindrical battery. In use, the first polarity of the core is electrically connected to the thinned area at the bottom of the casing through penetration welding. After the casing and the cover plate assembly are welded, the cover plate is electrically connected to the first polarity. The second polarity of the core is electrically connected to the second polarity connecting piece through welding, thereby connecting the second polarity connecting block to the second polarity. Compared with traditional large cylindrical batteries, this utility model saves the welding steps of the first polarity connecting piece used to connect the first polarity of the core and the casing, resulting in a simple structure, low material cost, and high production efficiency. The cylindrical battery of this utility model is equipped with a cover plate explosion-proof valve and a casing bottom explosion-proof valve on the cover plate assembly and at the bottom of the casing, respectively. When the cylindrical battery experiences thermal runaway, high-temperature and high-pressure gas can be quickly discharged along both ends of the core, preventing the battery from exploding and catching fire, thus improving battery safety. This utility model has the advantages of simple structure, low cost, high production efficiency, and no explosion or fire during thermal runaway. Attached Figure Description

[0014] Figure 1 This is an exploded view of the cylindrical battery design of this utility model.

[0015] Figure 2 This is a schematic diagram of the housing of this utility model.

[0016] Figure 3 This is a cross-sectional view of the shell of this utility model.

[0017] Figure 4 This is a schematic diagram of the core of this utility model.

[0018] Figure 5 This is a schematic diagram of the cover plate assembly of this utility model.

[0019] Figure 6 This is a cross-sectional view of the cylindrical battery of this utility model.

[0020] In the diagram: 1. Shell 1-1, Shell bottom 1-2, Shell cylindrical surface 1-3, Shell opening 1-4, Outer plane 1-5, Thinning area 1-6, Explosion-proof valve 1-7, Inner surface 1-8, Inner plane 2. Core 2-1, Body 2-2, First polarity 2-3, Second polarity 2-4, Fixing tape 2-5, Insulating tape 2-5-1, Edge of insulating tape 3. Cover plate assembly 3-1, Second polarity connecting block 3-2, Upper insulating component 3-3, Smooth cover plate 3-4, Lower insulating component 3-5, Second polarity connecting piece 3-6, Pole post 3-7, Liquid injection port 3-8, Cover plate explosion-proof valve 4. Penetration weld. Detailed Implementation

[0021] The cylindrical battery structure involved in this utility model includes a shell, a core, and a cover plate assembly. The first polarity of the core is electrically connected to the thinned area at the bottom of the shell through penetration welding. Compared with traditional large cylindrical batteries, this saves the welding steps of the first polarity connecting piece for connecting the first polarity of the core to the shell, resulting in a simple structure, low material cost, and high production efficiency. The cylindrical battery is equipped with a cover plate explosion-proof valve and a shell bottom explosion-proof valve on the cover plate assembly and at the bottom of the shell, respectively. When the cylindrical battery experiences thermal runaway, high-temperature and high-pressure gas can be quickly discharged along both ends of the core, preventing the battery from exploding and catching fire, thus improving the safety of the battery.

[0022] The present invention will be further described below with reference to the accompanying drawings. Example 1

[0023] like Figure 1-4 As shown, a cylindrical battery includes a housing (1), a core (2) and a cover assembly (3). The housing (1) is a barrel-shaped structure with one side open, the core (5) is a cylindrical structure, the core (2) is located inside the housing (1), and the cover assembly (3) is located on one side of the housing (1), so that the core (2) and the housing (1) are assembled and connected.

[0024] This utility model relates to a cylindrical battery. In use, the first polarity of the core is electrically connected to the thinned area at the bottom of the casing via through-welding. After the casing and cover plate assembly are welded, the cover plate is electrically connected to the first polarity. The second polarity of the core is electrically connected to the second polarity connecting piece via welding, thereby connecting the second polarity connecting block to the second polarity. Compared to traditional large cylindrical batteries, this invention eliminates the need for welding the first polarity connecting piece used to connect the core's first polarity to the casing, resulting in a simple structure, low material cost, and high production efficiency. This utility model's cylindrical battery is equipped with a cover plate explosion-proof valve on the cover plate assembly and a casing bottom explosion-proof valve on the bottom of the casing. When thermal runaway occurs in the cylindrical battery, high-temperature, high-pressure gas can be quickly discharged along both ends of the core, preventing the battery from exploding and catching fire, thus improving battery safety. This utility model has the advantages of simple structure, low cost, high production efficiency, and no explosion or fire during thermal runaway. Example 2

[0025] like Figure 1-4 As shown, a cylindrical battery includes a housing (1), a core (2) and a cover assembly (3). The housing (1) is a barrel-shaped structure with one side open, the core (5) is a cylindrical structure, the core (2) is located inside the housing (1), and the cover assembly (3) is located on one side of the housing (1), so that the core (2) and the housing (1) are assembled and connected.

[0026] In this embodiment, the cylindrical battery structure involved in the present invention includes a housing (1), a core (2), and a cover plate assembly (3).

[0027] The shell (1) is a barrel-shaped structure with one open side, comprising three parts: the bottom of the shell (1-1), the cylindrical surface of the shell (1-2), and the opening of the shell (1-3); the outer plane (1-4) of the bottom of the shell has a thinning zone (1-5) distributed thereon, and the inner surface (1-7) of the thinning zone is higher than the inner plane (1-8) of the bottom of the shell. The bottom of the shell (1-1) also has a bottom explosion-proof valve (1-6).

[0028] The core (2) is a cylindrical structure with a body (2-1) in the middle, a first polarity (2-2) at one end and a second polarity (2-3) at the other end. The body (2-1) is fixed by wrapping with a fixing tape (2-4), and the second polarity (2-3) is insulated from the outside by an insulating tape (2-5). The edge (2-5-1) of the insulating tape is higher than the outer surface of the second polarity (2-3).

[0029] The cover plate assembly (3) consists of a second polarity connecting block (3-1), an upper insulating component (3-2), a smooth cover plate (3-3), a lower insulating component (3-4), and a second polarity connecting piece (3-5), wherein the second polarity connecting block (3-1) and the second polarity connecting piece (3-5) are connected by a pole post (3-6); the smooth cover plate (3-3) is provided with an injection port (3-7) and a cover plate explosion-proof valve (3-8).

[0030] The first polarity (2-2) of the core is electrically connected to the thinning area (1-5) at the bottom of the casing by through welding (4). After the casing (1) is welded to the cover plate assembly (3), the light cover plate (3-3) is electrically connected to the first polarity (2-2). Compared with traditional large cylindrical batteries, it saves the welding steps of the first polarity connecting piece for connecting the core and the casing, and the first polarity connecting piece. The structure is simple, the material cost is low, and the production efficiency is high.

[0031] The second polarity (2-3) of the core is electrically connected to the second polarity connecting piece (3-5) by welding, thereby electrically connecting the second polarity connecting block (3-1) and the second polarity (2-3).

[0032] The cylindrical battery is equipped with a cover plate explosion-proof valve (3-8) on the cover plate assembly (3) and a housing bottom explosion-proof valve (1-6) on the bottom of the housing (1-1). When the cylindrical battery experiences thermal runaway, the high-temperature and high-pressure gas can be quickly discharged along both ends of the core to prevent the battery from exploding and catching fire, thus improving the safety of the battery.

[0033] This utility model relates to a cylindrical battery. In use, the first polarity of the core is electrically connected to the thinned area at the bottom of the casing via through-welding. After the casing and cover plate assembly are welded, the cover plate is electrically connected to the first polarity. The second polarity of the core is electrically connected to the second polarity connecting piece via welding, thereby connecting the second polarity connecting block to the second polarity. Compared to traditional large cylindrical batteries, this invention eliminates the need for welding the first polarity connecting piece used to connect the core's first polarity to the casing, resulting in a simple structure, low material cost, and high production efficiency. This utility model's cylindrical battery is equipped with a cover plate explosion-proof valve on the cover plate assembly and a casing bottom explosion-proof valve on the bottom of the casing. When thermal runaway occurs in the cylindrical battery, high-temperature, high-pressure gas can be quickly discharged along both ends of the core, preventing the battery from exploding and catching fire, thus improving battery safety. This utility model has the advantages of simple structure, low cost, high production efficiency, and no explosion or fire during thermal runaway.

Claims

1. A cylindrical battery comprising a casing, a winding core, and a cover assembly, characterized in that: The shell is a barrel-shaped structure with one open side, the core is a cylindrical structure, the core is located inside the shell, and the cover plate assembly is located on one side end of the shell, so that the core and the shell are assembled and connected. The shell includes a shell bottom, a shell cylindrical surface and a shell opening. Several thinning zones are distributed on the outer plane of the shell bottom, and the inner surface of the thinning zones is higher than the inner plane of the shell bottom. The core has a body in the middle, one end with a first polarity and the other end with a second polarity; The cover plate assembly consists of a second polarity connecting block, an upper insulating component, a light cover plate, a lower insulating component, and a second polarity connecting piece. The first polarity of the core is electrically connected to the thinning area at the bottom of the housing via through-welding. After the housing is welded to the cover plate assembly, the light cover plate is electrically connected to the first polarity. The second polarity of the core is electrically connected to the second polarity connecting piece by welding, thereby the second polarity connecting block is electrically connected to the second polarity; The cylindrical battery is provided with a cover plate explosion-proof valve and a housing bottom explosion-proof valve on the cover plate assembly and the bottom of the housing, respectively.

2. A cylindrical battery according to claim 1, characterized in that: An explosion-proof valve is also installed at the bottom of the housing.

3. A cylindrical battery according to claim 1, characterized in that: The main body is fixed by wrapping with adhesive tape, and the second polarity is insulated from the outside by insulating tape, with the edge of the insulating tape being higher than the outer surface of the second polarity.

4. A cylindrical battery according to claim 1, characterized in that: The second polarity connector and the second polarity connector are connected by a pole post.

5. A cylindrical battery according to claim 4, characterized in that: The cover plate is equipped with an injection port and an explosion-proof valve.

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