A battery cover and a battery

Abstract

This utility model belongs to the field of battery structure technology, specifically relating to a battery cover plate and a battery. The cover plate mainly consists of two parts: an electrode post assembly and a cover plate assembly. The electrode post assembly comprises an inner electrode post and an explosion-proof sheet. The inner electrode post has an annular flange along its edge, a welding surface on its upper surface, and an explosion-proof sheet at its bottom. A first through hole is axially arranged in the middle of the inner electrode post. The cover plate assembly includes an outer electrode post, with a second through hole axially arranged in the middle. A stepped groove is provided on the upper surface of the second through hole. The electrode post assembly is embedded in the second through hole of the cover plate assembly through the cooperation of the annular flange and the stepped groove. A smooth cover plate is fitted over the outer electrode post. This utility model has a reasonable structure, reduces the difficulty of liquid injection, avoids damage to the explosion-proof sheet during assembly and subsequent use, increases the flow area of ​​the electrode post, and reduces production costs.

Description

Technical Field

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

[0002] Lithium-ion batteries 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. Therefore, they have gradually gained popularity and have gradually replaced other traditional batteries in the fields of energy storage and power batteries.

[0003] For batteries, especially cylindrical batteries, the electrolyte filling hole is usually located on the cover plate. During filling, the equipment needs to accurately locate the filling hole, which is difficult, inaccurate, and prone to electrolyte leakage. Traditional explosion-proof sheets are welded to the cover plate; during assembly, welding, and subsequent use, the explosion-proof sheet is easily damaged by contact, requiring an additional protective film, increasing costs. Traditional riveted terminals have a small cross-sectional area and low current carrying capacity, making them unsuitable for high-rate fast-charging batteries. For cylindrical batteries, the presence of the filling hole and explosion-proof sheet on the cover plate means that the battery must avoid these locations during PACK installation, causing inconvenience. To solve these problems, it is necessary to design a cover plate and battery structure that facilitates electrolyte filling, provides good explosion-proof protection, has strong current carrying capacity, eliminates the need to consider battery placement angle, and is easy to apply. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a battery cover and battery to reduce the difficulty of liquid injection, avoid damage to the explosion-proof sheet during assembly and later use, increase the current flow area of ​​the terminal post, and reduce production costs.

[0005] The purpose of this utility model is achieved as follows: a battery cover plate, the main body of which is composed of two parts: an electrode post assembly and a cover plate assembly, wherein the electrode post assembly is composed of an inner electrode post and an explosion-proof sheet;

[0006] The upper surface of the inner electrode post is a welding surface, and a first through hole is provided in the middle of the inner electrode post along the axial direction. The explosion-proof sheet is disposed in the first through hole of the inner electrode post.

[0007] The cover plate assembly includes an outer pole post, and a second through hole is provided in the middle of the outer pole post along the axial direction. The inner pole post is fixedly connected in the second through hole.

[0008] Furthermore, the explosion-proof plate is located at the bottom of the first through hole of the inner pole post, the edge of the inner pole post is provided with an annular flange, and the upper surface of the second through hole is provided with a stepped groove. The pole post assembly is embedded in the second through hole of the cover plate assembly through the cooperation of the annular flange and the stepped groove. The inner pole post is a cylindrical structure with a central hole, and the outer pole post is a cylindrical structure with an I-shaped cross-section. The pole post assembly is connected to the cover plate assembly through the annular flange.

[0009] Furthermore, the explosion-proof sheet is connected to the lower surface of the inner pole by welding.

[0010] Furthermore, the first through hole inside the inner pole post is a stepped through hole with multiple steps.

[0011] Furthermore, the first through hole is provided with three steps. The one closest to the lower surface is the first step hole, which is used to accommodate and weld the explosion-proof sheet. The one adjacent to the first step hole is the second step hole, and the one adjacent to the second step hole is the third step hole.

[0012] Furthermore, the diameter of the first stepped hole is greater than or equal to the diameter of the second stepped hole and the diameter of the third stepped hole.

[0013] Furthermore, a light cover plate is fitted over the outer electrode post. The outer electrode post is separated from the light cover plate by upper and lower plastics on its outer surface, and is sealed and isolated from the light cover plate by a first sealing ring disposed on its outer surface.

[0014] Furthermore, after the pole post assembly is embedded in the second through hole of the cover plate assembly, the flange is engaged in the stepped groove and connected by welding.

[0015] Furthermore, a second sealing ring is provided between the bottom of the pole assembly and the cover plate assembly.

[0016] A battery, including the aforementioned battery cover.

[0017] The beneficial effects of this utility model are as follows: 1. This battery cover plate can be used for cylindrical batteries, with the liquid injection hole placed in the center of the terminal post. Compared to the traditional liquid injection hole set on a smooth cover plate, the liquid injection hole does not need to be accurately located during equipment liquid injection, reducing the difficulty of liquid injection; 2. The explosion-proof sheet is set under the terminal post, avoiding collision damage to the explosion-proof sheet during assembly and later use, and also saving the protective film of the explosion-proof sheet; 3. Compared to the traditional riveted terminal post, the terminal post of this utility model has a larger cross-sectional area, which can carry a larger current, and is suitable for high-rate fast-charging batteries; 4. For cylindrical batteries, compared to the traditional cover plate structure, the smooth cover plate has no explosion-proof sheet or liquid injection hole, and the battery can be placed arbitrarily when used in a PACK without considering the avoidance of explosion-proof sheet and liquid injection hole, reducing the difficulty of application. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of a battery cover according to the present invention.

[0019] Figure 2 This is an exploded structural diagram of a battery cover according to the present invention.

[0020] Figure 3 This is an exploded structural diagram of a battery cover plate terminal assembly according to the present invention.

[0021] Figure 4 This is a cross-sectional structural diagram of a battery cover plate terminal assembly according to the present invention.

[0022] Figure 5 This is a cross-sectional structural diagram of a battery cover plate assembly according to the present invention.

[0023] Figure 6 This is a schematic cross-sectional view of the battery cover plate of this utility model.

[0024] Figure 7 This is a cross-sectional structural diagram of a battery cover plate with a second sealing ring according to the present invention.

[0025] Figure 8 This is a schematic diagram of the structure of a battery according to the present invention. Detailed Implementation

[0026] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0027] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] It should be noted that all directional indications (such as up-down-left-right-forward-backward...) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0029] like Figure 1-8 As shown, a battery cover plate has a main body 1 consisting of two parts: a terminal post assembly 2 and a cover plate assembly 3. The terminal post assembly 2 consists of an inner terminal post 4 and an explosion-proof sheet 5.

[0030] The inner electrode post 4 has an annular flange 41 on its edge, and the upper surface of the inner electrode post 4 is a welding surface 42 for electrical connection of the battery. The bottom of the inner electrode post 4 is provided with an explosion-proof sheet 5 for venting when the battery thermally runs away. The middle of the inner electrode post 4 is provided with a first through hole 43 along the axial direction for providing an venting channel for the explosion-proof sheet 5 to explode.

[0031] The cover plate assembly 3 includes an outer pole post 31. The outer pole post 31 has a second through hole 32 arranged axially in the middle. The upper surface of the second through hole 32 is provided with a stepped groove 33. The pole post assembly 2 is embedded in the second through hole 32 of the cover plate assembly 3 through the cooperation of the annular flange 41 and the stepped groove 33. A light cover plate 34 is sleeved on the outside of the outer pole post 31.

[0032] Furthermore, in one embodiment, the inner pole post 4 is a cylindrical structure with a central hole, the outer pole post 31 is a cylindrical structure with an I-shaped cross-section, and the pole post assembly 2 is connected to the cover plate assembly 3 through the annular flange 41.

[0033] Furthermore, in one embodiment, the explosion-proof sheet 5 is connected to the lower surface of the inner pole post 4 by welding.

[0034] Furthermore, the first through hole 43 inside the inner pole post 4 is a stepped through hole with multiple steps, which facilitates the embedding and connection of the explosion-proof sheet 5 and provides space for the explosion-proof sheet 5 to explode.

[0035] Furthermore, in one embodiment, the first through hole 43 is provided with three steps. The one closest to the lower surface is the first step hole 44, which is used to accommodate and weld the explosion-proof sheet 5. The one adjacent to the first step hole 44 is the second step hole 45, which provides deformation space for the explosion-proof sheet 5 to explode. The one adjacent to the second step hole 45 is the third step hole 46, which provides an exhaust channel for the explosion-proof sheet 5 to explode.

[0036] Furthermore, in one embodiment, the diameter of the first stepped hole 44 is greater than or equal to the diameter of the second stepped hole 45 and the diameter of the third stepped hole 46.

[0037] Furthermore, in one embodiment, the outer electrode post 31 is separated from the light cover plate 34 by an upper plastic 35 and a lower plastic 36 disposed on its outer surface. The upper plastic 35 and the lower plastic 36 can achieve insulation between the outer electrode post 31 and the light cover plate 34, and the first sealing ring 37 disposed on its outer surface can seal and isolate it from the light cover plate 34.

[0038] Furthermore, in one embodiment, after the pole post assembly 2 is embedded in the second through hole 32 of the cover plate assembly 3, the flange 41 is engaged in the stepped groove 33 and connected by laser welding 6 to achieve the connection and sealing of the pole post assembly 2 and the cover plate assembly 3.

[0039] Furthermore, in one embodiment, a second sealing ring 7 is provided between the bottom of the pole assembly 2 and the cover plate assembly 3 to avoid electrochemical corrosion or sealing problems at the welding interface between the pole assembly 2 and the cover plate assembly 3 under certain circumstances.

[0040] A battery, including the aforementioned battery cover.

[0041] In summary, this utility model provides a battery cover plate suitable for cylindrical batteries. Its electrolyte filling hole is located at the center of the terminal post, unlike traditional covers where the filling hole is located on a plain cover. This eliminates the need to precisely locate the filling hole during filling, reducing the difficulty of the process. The explosion-proof sheet is positioned below the terminal post, preventing damage during assembly and subsequent use, and also saving on the need for a protective film. Compared to traditional riveted terminals, this utility model's terminal post has a larger cross-sectional area, allowing it to handle higher currents, making it suitable for high-rate fast-charging batteries. For cylindrical batteries, unlike traditional cover plate structures, the plain cover plate lacks both an explosion-proof sheet and an electrolyte filling hole, allowing for flexible placement of the battery during PACK installation without needing to consider the avoidance of the explosion-proof sheet and filling hole, further simplifying application.

[0042] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A battery cover plate, characterized by, Its cover plate body (1) is composed of two parts: pole post assembly (2) and cover plate assembly (3). The pole post assembly (2) is composed of inner pole post (4) and explosion-proof sheet (5). The upper surface of the inner pole post (4) is a welding surface (42), and a first through hole (43) is provided in the middle of the inner pole post (4) along the axial direction. The explosion-proof sheet (5) is provided in the first through hole (43) of the inner pole post (4). The cover plate assembly (3) includes an outer pole post (31), and a second through hole (32) is provided in the middle of the outer pole post (31) along the axial direction. The inner pole post (4) is fixedly connected in the second through hole (32).

2. The battery cover plate of claim 1, wherein, The explosion-proof plate (5) is located at the bottom of the first through hole (43) of the inner pole post (4). The edge of the inner pole post (4) is provided with an annular flange (41). The upper surface of the second through hole (32) is provided with a stepped groove (33). The pole post assembly (2) is embedded in the second through hole (32) of the cover plate assembly (3) through the cooperation of the annular flange (41) and the stepped groove (33). The inner pole post (4) is a cylindrical structure with a central hole. The outer pole post (31) is a cylindrical structure with an I-shaped cross section. The pole post assembly (2) is connected to the cover plate assembly (3) through the annular flange (41).

3. The battery cover plate of claim 1, wherein, The explosion-proof sheet (5) is connected to the lower surface of the inner pole post (4) by welding.

4. The battery cover plate of claim 1, wherein, The first through hole (43) inside the inner pole post (4) is a stepped through hole with multiple steps.

5. The battery cover plate of claim 4, wherein, The first through hole (43) is provided with three steps. The one closest to the lower surface is the first step hole (44), which is used to accommodate and weld the explosion-proof sheet (5). The one adjacent to the first step hole (44) is the second step hole (45), and the one adjacent to the second step hole (45) is the third step hole (46).

6. A battery cover plate according to claim 5, wherein, The diameter of the first stepped hole (44) is greater than or equal to the diameter of the second stepped hole (45) and the diameter of the third stepped hole (46).

7. The battery cover plate of claim 1, wherein, The outer pole post (31) is covered with a light cover plate (34). The outer pole post (31) is separated from the light cover plate (34) by an upper plastic (35) and a lower plastic (36) provided on its outer surface, and is sealed and isolated from the light cover plate (34) by a first sealing ring (37) provided on its outer surface.

8. The battery cover plate of claim 2, wherein, After the pole post assembly (2) is embedded in the second through hole (32) of the cover plate assembly (3), the flange (41) is engaged in the step groove (33) and connected by welding.

9. The battery cover plate of claim 1, wherein, A second sealing ring (7) is provided between the bottom of the pole assembly (2) and the cover plate assembly (3).

10. A battery, characterized in that, Includes a battery cover as described in any one of claims 1-9.

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