Battery casing and battery

Abstract

This utility model discloses a battery casing and a battery, belonging to the field of energy storage device technology, and is designed to solve the problem of poor stability in the connection structure between the battery terminals and the casing in existing batteries. The battery casing disclosed in this utility model includes: a casing body, which is barrel-shaped; a top cover ring, which is annular and connected to the open end of the casing body; and terminals, which pass through the central opening of the top cover ring. A first adhesive layer is provided between the terminals and the top cover ring, and the first adhesive layer bonds the terminals and the top cover ring together, creating a seal between them. The battery casing and battery disclosed in this utility model, with the first adhesive layer between the terminals and the top cover ring, improve the tightness of the connection between the terminals and the top cover ring, making the overall structure of the battery casing more robust. The first adhesive layer creates a seal between the terminals and the top cover ring, enhancing the sealing reliability between them and making them safer to use.

Description

Technical Field

[0001] This utility model relates to the field of energy storage device technology, and in particular to battery casing and battery. Background Technology

[0002] The outer casing of a lithium-ion battery is made of metal (such as steel), and the internal core is wrapped inside the casing. The casing protects and isolates the internal core, making it safer to use and extending the battery's lifespan.

[0003] Currently, various steel-cased lithium-ion batteries (button type, pin type, cylindrical type, square type, etc.) mainly consist of a barrel-shaped casing and a top cover assembly. The top cover assembly mainly includes the terminals. The internal core is located in the casing, and the top cover assembly is connected to the top of the casing. The internal core is welded to the top cover assembly, and the gaps between the terminals and other structures of the top cover assembly are filled with PP glue, thus forming a sealed outer shell.

[0004] The shortcomings of existing casings include: PP adhesive can provide a certain degree of sealing, but it is difficult to enhance the tightness of the connection between the terminal and the surrounding structure, resulting in low overall casing strength; as battery size is miniaturized, the welding area between the internal core and the top cover assembly decreases, leading to poorer welding performance. Utility Model Content

[0005] The purpose of this invention is to propose a battery casing and battery, which solves the problem of poor stability in the connection structure between the existing battery terminals and the casing, making it safer to use.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The battery casing includes: a casing body, which is barrel-shaped; a top cover ring, which is annular and connected to the open end of the casing body; and a terminal post, which passes through the central opening of the top cover ring. A first adhesive layer is provided between the terminal post and the top cover ring, the first adhesive layer bonding the terminal post and the top cover ring together, and the first adhesive layer can seal the terminal post and the top cover ring.

[0008] In one preferred embodiment, the pole includes a pole body and a pole cap connected together. The diameter of the pole cap is larger than the diameter of the pole body. The pole body passes through the central opening of the top cover ring, and the pole cap is attached to the surface of the top cover ring through the first adhesive layer.

[0009] In one preferred embodiment, the battery casing further includes a ring-shaped reinforcing member located inside the top cover ring, the terminal post protrusion is located outside the top cover ring, the free end of the terminal post body passes through the central opening of the top cover ring, and the reinforcing member is sleeved and fixedly connected to the free end of the terminal post body.

[0010] In one preferred embodiment, the free end of the pole body and the reinforcing member are respectively used to connect to the internal winding core.

[0011] In one preferred embodiment, the battery casing further includes a ring-shaped reinforcing member located outside the top cover ring, the terminal post protrusion is located inside the top cover ring, the free end of the terminal post body extends through the central opening of the top cover ring, and the reinforcing member is sleeved and fixedly connected to the free end of the terminal post body.

[0012] In one preferred embodiment, the pole cap is used to connect to the inner winding core.

[0013] In one preferred embodiment, a second adhesive layer is bonded between the reinforcing member and the top cover ring, the second adhesive layer creating a seal between the reinforcing member and the top cover ring.

[0014] In one preferred embodiment, the outer diameter of the second adhesive layer is larger than the outer diameter of the reinforcing member.

[0015] In one preferred embodiment, a stepped annular groove is provided at the top of the shell body, and the top cover ring is disposed in the annular groove, with the top surface of the shell body flush with the top surface of the top cover ring; or, an annular groove is provided on the outer periphery of the bottom surface of the top cover ring, and the top of the shell body is disposed in the annular groove, with the side periphery of the top cover ring flush with the outer periphery of the shell body.

[0016] On the other hand, the present invention adopts the following technical solution:

[0017] The battery includes an internal winding core and a battery casing as described above, wherein the internal winding core is located within the casing body and connected to the terminals.

[0018] The battery casing disclosed in this utility model has a first adhesive layer between the terminal posts and the top cover ring. The first adhesive layer bonds the terminal posts and the top cover ring together, improving the tightness of the connection between the terminal posts and the top cover ring, and making the overall structure of the battery casing more robust. The first adhesive layer creates a seal between the terminal posts and the top cover ring, enhancing the sealing reliability between the terminal posts and the top cover ring, and making it safer to use.

[0019] The battery disclosed in this utility model includes the aforementioned battery casing, which has a more stable overall structure, effectively prevents the terminals from separating from the top cover ring, extends the battery's lifespan, and provides high safety and strong product competitiveness. The first injection layer also acts as an insulator between the terminals and the top cover ring, improving the overall safety of the battery. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a battery casing provided in a specific embodiment of this utility model;

[0021] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0022] Figure 3 This is a schematic diagram of another battery casing provided in a specific embodiment of this utility model;

[0023] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0024] Figure 5 yes Figure 3 A magnified view of a section at point C;

[0025] Figure 6 This is a schematic diagram of another connection structure between the shell body and the top cover ring provided in a specific embodiment of this utility model.

[0026] In the picture:

[0027] 1. Shell body; 2. Top cover ring; 3. Terminal post; 4. First injection layer; 5. Reinforcing member; 6. Second injection layer; 11. Shell annular through groove; 21. Cover annular through groove; 31. Terminal post body; 32. Terminal post convex cover. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0034] This embodiment discloses a battery casing and a battery including the casing. Specifically, the battery also includes an internal winding core located in the casing body for storing and providing electrical energy.

[0035] like Figures 1 to 4 As shown, the battery casing includes a casing body 1, a top cover ring 2, and a terminal post 3. The casing body 1 is barrel-shaped, the top cover ring 2 is annular, and the top cover ring 2 is connected to the open end of the casing body 1; the terminal post 3 passes through the central opening of the annular top cover ring 2.

[0036] A first adhesive layer 4 is provided between the terminal post 3 and the top cover ring 2. This first adhesive layer 4 bonds the terminal post 3 and the top cover ring 2 together, improving the tightness of the connection and making the overall battery casing structure more robust. The first adhesive layer 4 also creates a seal between the terminal post 3 and the top cover ring 2, enhancing the reliability of the seal and making it safer to use. Furthermore, the first adhesive layer 4 also acts as an insulator between the terminal post 3 and the top cover ring 2, improving the overall safety of the battery.

[0037] The specific material used to prepare the first adhesive layer 4 is not limited; any material with adhesive and insulating properties found in the prior art can be used. Furthermore, to extend the overall service life, the material used to prepare the first adhesive layer 4 must not be corrosive to the materials of the pole post 3 and the top cover ring 2. The material used to prepare the first adhesive layer 4 can be, but is not limited to, a UV adhesive containing epoxy resin and acrylic resin, a thermoplastic insulating adhesive, or a thermosetting insulating adhesive.

[0038] The specific shape of the pole post 3 is not limited, as long as it can be stably connected to the top cover ring 2 through the first adhesive layer 4. In this embodiment, the pole post 3 includes a pole post body 31 and a pole post protrusion 32 connected to each other. The diameter of the pole post protrusion 32 is larger than the diameter of the pole post body 31. When cut along the axial direction of the pole post body 31, the cross-section of the pole post 3 is T-shaped.

[0039] The electrode body 31 passes through the central opening of the top cover ring 2, and the electrode protrusion 32 is attached to the surface of the top cover ring 2 through the first adhesive layer 4. The area of ​​the electrode protrusion 32 is larger than the end area of ​​the electrode body 31, thereby increasing the contact area with the top cover ring 2. The area of ​​the first adhesive layer 4 will also be increased accordingly, making the connection between the electrode 3 and the top cover ring 2 more stable and the insulation performance stronger.

[0040] The specific installation method of the pole post 3 is not limited. It can be that the pole post protrusion 32 is located on the outside of the top cover ring 2, or the pole post protrusion 32 is located on the inside of the top cover ring 2. The two structures are described below.

[0041] like Figure 1 and Figure 2 As shown, the terminal post protrusion 32 is located outside the top cover ring 2, and the free end of the terminal post body 31 extends into the battery through the central opening of the top cover ring 2. The battery casing also includes a ring-shaped reinforcing member 5 located inside the top cover ring 2, which is sleeved and fixedly connected to the free end of the terminal post body 31.

[0042] The reinforcing member 5 and the free end of the terminal block 31 together form the internal welding area. The outer diameter of the reinforcing member 5 can be adjusted as needed to increase the welding area between it and the internal core, resulting in a more stable connection, lower requirements for welding processes, and a higher yield. In addition, the reinforcing member 5 increases the strength of the top cover ring 2, making the battery more impact-resistant and safer to use.

[0043] During installation, the first adhesive layer 4 is first laid on the outer surface around the central opening of the top cover ring 2. The free end of the pole body 31 passes through the central opening of the top cover ring 2, and the pole convex cap 32 is pressed tightly onto the first adhesive layer 4, firmly bonding the pole 3 and the top cover ring 2 together. The reinforcing member 5 is fixedly connected to the free end of the pole body 31 from the inside of the top cover ring 2 by riveting, welding, etc. Then, the integral structure composed of the reinforcing member 5 and the free end of the pole body 31 is welded to the internal core. After welding, the integral structure composed of the reinforcing member 5, the pole body 31, the top cover ring 2, and the internal core is installed into the shell body 1, and the top cover ring 2 is fixedly connected to the shell body 1, thus assembling the complete battery.

[0044] The reinforcing member 5 is designed in a ring shape, with the free end of the pole body 31 passing through the through hole in the middle of the reinforcing member 5. The edge of the through hole in the middle of the reinforcing member 5 is fixedly connected to the outer circumference of the pole body 31, making the connection more stable. During assembly, the free end of the pole body 31 and the reinforcing member 5 are welded to the internal core, which does not affect the connection between the pole body 31 and the internal core, and increases the welding area of ​​the internal core, preventing the internal core from separating from the outer shell.

[0045] like Figure 3 and Figure 4As shown, the terminal post protrusion 32 is located inside the top cover ring 2, and the free end of the terminal post body 31 protrudes through the central opening of the top cover ring 2. The battery casing also includes a ring-shaped reinforcing member 5 located outside the top cover ring 2, which is sleeved and fixedly connected to the free end of the terminal post body 31.

[0046] The top surface of the pole post protrusion 32 forms a welding area. The top area of ​​the pole post protrusion 32 can be adjusted as needed to achieve stable welding of the internal core, making the connection between the internal core and the outer shell more secure.

[0047] During installation, the first adhesive layer 4 is first laid on the inner surface around the central opening of the top cover ring 2. The free end of the pole body 31 passes through the central opening of the top cover ring 2 from bottom to top. The upper surface of the pole convex cover 32 is pressed tightly onto the first adhesive layer 4, and the pole 3 and the top cover ring 2 are firmly bonded together. The reinforcing member 5 is fixedly connected to the free end of the pole body 31 from the outside of the top cover ring 2 by riveting, welding or other means. The internal core is welded to the lower surface of the pole convex cover 32. After complete welding, the integral structure composed of the reinforcing member 5, the pole body 31, the top cover ring 2 and the internal core is installed into the shell body 1. The top cover ring 2 is fixedly connected to the shell body 1, and the complete battery assembly is completed.

[0048] In this structure, the first adhesive layer 4 is located inside the battery. When an external force impacts the terminal post 3 or a substance corrodes the terminal post 3 and its nearby objects, the first adhesive layer 4 will not be affected. This reduces the probability of the terminal post 3 separating from the top cover ring 2 due to the failure of the first adhesive layer 4, extends the battery's service life, and makes it safer to use.

[0049] The pole post convex cover 32 is a sheet-like integral structure. After being welded to the internal winding core, the pole post convex cover 32 can share the external force, and will not concentrate the pressure, tension and other forces generated by the internal winding core at individual points on the pole post convex cover 32, so the pole post convex cover 32 is not easily damaged.

[0050] Based on the above structure, a second adhesive layer 6 is bonded between the reinforcing member 5 and the top cover ring 2. The material of the second adhesive layer 6 is the same as or similar to that of the first adhesive layer 4, thereby improving the stability between the reinforcing member 5 and the top cover ring 2, and also improving the sealing performance between the reinforcing member 5 and the top cover ring 2.

[0051] To avoid gaps between the edge of the reinforcing member 5 and the top cover ring 2, the outer diameter of the second adhesive layer 6 is larger than the outer diameter of the reinforcing member 5, ensuring that the entire surface of the reinforcing member 5 can be tightly bonded to the top cover ring 2, making the overall structure more robust.

[0052] The specific mounting structure of the shell body 1 and the top cover ring 2 is not limited, as long as the shell body 1 and the top cover ring 2 can form a stable outer shell. In this embodiment, two structures are designed to improve the stability of the connection.

[0053] like Figure 3 and Figure 5 As shown, a stepped annular groove 11 is provided at the top of the shell body 1. The top cover ring 2 is disposed in the shell annular groove 11, and the top surface of the shell body 1 is flush with the top surface of the top cover ring 2. The stepped surface of the shell annular groove 11 can support the weight of the top cover ring 2 and the objects connected to the top cover ring 2, reduce the load on the welded structure, and prevent the shell body 1 from separating from the top cover ring 2.

[0054] like Figure 6 As shown, an annular groove 21 is formed on the outer periphery of the bottom surface of the top cover ring 2. The top end of the shell body 1 is positioned within the annular groove 21, and the side peripheral surface of the top cover ring 2 is flush with the outer peripheral surface of the shell body 1. The stepped structure of the annular groove 21 prevents relative movement between the shell body 1 and the top cover ring 2 in the radial direction. Furthermore, the top end of the shell body 1 can withstand the pressure from the top cover ring 2 and objects connected to it, reducing the load on the welded structure and preventing separation of the shell body 1 and the top cover ring 2 due to damage to the welded structure.

[0055] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery casing, characterized in that, include: The main body of the shell (1) is barrel-shaped; The top cover ring (2) is annular and is connected to the opening end of the shell body (1); A pole (3) is inserted through the central opening of the top cover ring (2). A first adhesive layer (4) is provided between the pole (3) and the top cover ring (2). The first adhesive layer (4) bonds the pole (3) and the top cover ring (2) together. The first adhesive layer (4) can seal the pole (3) and the top cover ring (2). The pole (3) includes a pole body (31) and a pole protrusion (32) connected together. The diameter of the pole protrusion (32) is larger than the diameter of the pole body (31). The pole body (31) is inserted through the central opening of the top cover ring (2). The pole protrusion (32) is attached to the surface of the top cover ring (2) through the first adhesive layer (4). The reinforcing member (5) is located inside the top cover ring (2) and is annular. The pole post protrusion (32) is located outside the top cover ring (2). The free end of the pole post body (31) passes through the middle opening of the top cover ring (2). The reinforcing member (5) is sleeved and fixedly connected to the free end of the pole post body (31).

2. The battery casing according to claim 1, characterized in that, The free end of the pole body (31) and the reinforcing member (5) are respectively used to connect to the internal winding core.

3. The battery casing according to claim 1, characterized in that, The battery casing also includes a ring-shaped reinforcing member (5) located outside the top cover ring (2), the pole post protrusion (32) located inside the top cover ring (2), the free end of the pole post body (31) passing through the central opening of the top cover ring (2), and the reinforcing member (5) being sleeved and fixedly connected to the free end of the pole post body (31).

4. The battery casing according to claim 3, characterized in that, The pole cap (32) is used to connect to the inner core.

5. The battery casing according to any one of claims 1 to 4, characterized in that, A second adhesive layer (6) is bonded between the reinforcing member (5) and the top cover ring (2), and the second adhesive layer (6) seals the reinforcing member (5) and the top cover ring (2).

6. The battery casing according to claim 5, characterized in that, The outer diameter of the second adhesive layer (6) is larger than the outer diameter of the reinforcing member (5).

7. The battery casing according to any one of claims 1 to 4, characterized in that, The top of the shell body (1) is provided with a stepped annular groove (11), and the top cover ring (2) is disposed in the annular groove (11). The top surface of the shell body (1) is flush with the top surface of the top cover ring (2); or, The bottom outer periphery of the top cover ring (2) is provided with a cover annular through groove (21), the top of the shell body (1) is set in the cover annular through groove (21), and the side peripheral surface of the top cover ring (2) is flush with the outer peripheral surface of the shell body (1).

8. A battery, including an internal winding core, characterized in that, The battery further includes a battery casing as described in any one of claims 1 to 7, wherein an internal winding is located in the casing body and connected to the terminal post (3).

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