Metal-plastic integrated lithium battery cover plate

Abstract

This utility model discloses an integrated metal and plastic lithium battery cover, comprising a plastic plate and a metal plate. The metal plate is annular, and the edge of the plastic plate has a connecting part that mates with the metal plate along its circumferential direction. The connecting part includes a sealing cavity and a fixing part, which are arranged in a convex shape. During connection, the inner side of the metal plate extends into the sealing cavity along the fixing part, and the outer side of the metal plate extends out of the plastic plate. The metal plate and the fixing part are fixedly connected. Sealing adhesive is injected into the sealing cavity. By creating a lithium battery composite cover that combines plastic and metal plates, in use, the lithium battery composite cover mainly uses the plastic plate to mate with the terminal post, and the metal plate is used as an auxiliary to connect with the lithium battery casing. This facilitates connection while preventing short circuits at the battery cover to ensure insulation, improve battery safety, and prevent battery thermal runaway.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to an integrated metal and plastic lithium battery cover. Background Technology

[0002] With the development of new energy battery technology, storage batteries are being used in various fields. A typical storage battery structure includes a casing and a cover. The casing contains positive and negative electrode materials and electrolyte, while the cover contains positive and negative electrode terminals that mate with the electrode materials. Currently, cover materials are mostly metal or plastic and composite materials. Metal cover materials are prone to short circuits, affecting battery safety, while plastic and composite material cover materials are inconvenient to connect to the metal casing during encapsulation. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, the technical problem to be solved by this utility model is to propose an integrated metal and plastic lithium battery cover, which improves the safety of the lithium battery cover and facilitates encapsulation.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] This utility model provides an integrated metal and plastic lithium battery cover, which includes a plastic plate and a metal plate. The metal plate is annular, and the edge of the plastic plate is provided with a connecting part that cooperates with the metal plate in the circumferential direction.

[0006] The connecting part includes a sealing cavity and a fixing part, which are arranged in a convex shape. During connection, the inner side of the metal plate extends into the sealing cavity along the fixing part, and the outer side of the metal plate extends out of the plastic plate. The metal plate and the fixing part are fixedly connected. To ensure effective connection, the width 'a' of the metal plate extending out of the plastic plate is not higher than 1 / 5 of the width 'b' of the metal plate, and the width 'c' of the fixing part is not lower than 1 / 3 of the width 'b' of the metal plate. The metal plate and the fixing part are fixedly connected by either laser welding or thermoforming welding. The sealing cavity is filled with a sealing adhesive, and the material used for the sealing adhesive is one of epoxy resin, polyurethane, and silicone rubber. The metal plate is made of stainless steel or aluminum alloy. The metal plate also has several sealing holes that cooperate with the sealing cavity. The sealing holes are evenly arranged along the sealing cavity to ensure that the sealing adhesive injected into the sealing cavity can evenly cover the entire sealing cavity.

[0007] Preferably, the top of the plastic plate is also provided with terminal hole and liquid injection port to facilitate assembly and mating with lithium battery terminals.

[0008] The beneficial effects of this utility model are as follows:

[0009] (1) This utility model mainly produces a lithium battery composite cover that combines plastic and metal plates. When in use, the lithium battery composite cover is mainly made of plastic plates and cooperates with the poles, and is supplemented by metal plates and connected to the battery shell of the lithium battery. In this way, it can facilitate connection, avoid short circuit at the battery cover, ensure good insulation, improve battery safety, and prevent battery thermal runaway.

[0010] (2) By providing a convex-shaped connecting part on the circumferential edge of the plastic plate, the inner side of the metal plate can extend into the sealing cavity along the fixed part of the connecting part. At the same time, sealing holes are evenly opened in the part of the metal plate that extends into the sealing cavity, so that when the sealing adhesive is injected into the sealing cavity, it can effectively and evenly fill the entire sealing cavity, improve the sealing performance after the plastic plate and the metal plate are connected. After the sealing adhesive solidifies in the sealing cavity, it can also further improve the structural stability after the plastic plate and the metal plate are connected. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of an integrated metal and plastic lithium battery cover structure provided in a specific embodiment of this utility model;

[0012] Figure 2 yes Figure 1 A schematic diagram of the cross-section of ee;

[0013] Figure 3 This is an exploded view of an integrated metal and plastic lithium battery cover provided in a specific embodiment of this utility model;

[0014] In the picture:

[0015] 1. Plastic plate; 11. Electrode post hole; 12. Injection port;

[0016] 2. Metal plate; 21. Sealing hole;

[0017] 3. Connecting part; 31. Sealing cavity; 32. Fixed part; 311. Sealing adhesive. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] In the encapsulation process of lithium battery covers and battery casings, to address the issues of short circuits (i.e., short circuits between the terminals and the cover causing safety problems) when using metal covers, and the inconvenience of connecting plastic and composite material covers to the metal casing, this utility model provides an integrated metal-plastic lithium battery cover. The technical solution involves fabricating a lithium battery composite cover. Unlike traditional composite covers, this lithium battery composite cover primarily uses plastic plates to cooperate with the terminals, and uses metal plates as a secondary component to connect to the lithium battery casing. Specifically, this lithium battery cover includes... Preferably, the top of the plastic plate 1 and the metal plate 2 are provided with an electrode hole 11 that mates with the lithium battery electrode, and an injection port 12 for convenient injection of electrolyte into the battery case. Furthermore, the metal plate 2 is annular. In order to achieve the connection between the plastic plate 1 and the metal plate 2, the edge of the plastic plate 1 is provided with a connecting part 3 that mates with the metal plate 2 along the circumferential direction. In this way, the metal plate 2 can be embedded into the connecting part 3, thereby achieving a firm connection between the plastic plate 1 and the metal plate 2. To achieve this purpose, the connecting part 3 must meet two requirements after the plastic plate 1 and the metal plate 2 are connected, namely, to ensure connection strength and sealing.

[0020] From the perspective of ensuring connection strength, the connecting part 3 includes a sealing cavity 31 and a fixing part 32. The sealing cavity 31 and the fixing part 32 are arranged in a convex shape. When connecting, the inner side of the metal plate 2 extends into the sealing cavity 31 along the fixing part 32, and the outer side of the metal plate 2 extends out of the plastic plate 1. In order to facilitate the fixed connection and connection strength between the metal plate 2 and the lithium battery metal shell, the width a of the metal plate 2 extending out of the plastic plate 1 is not higher than 1 / 5 of the width b of the metal plate 2. At the same time, the metal plate 2 and the fixing part 32 are fixedly connected. In order to ensure the connection strength between the metal plate 2 and the fixing part 32, the width c of the fixing part 32 is not less than 1 / 3 of the width b of the metal plate 2. The metal plate 2 and the fixing part 32 are fixedly connected by either laser welding or hot pressing welding.

[0021] From the perspective of ensuring airtightness, after the metal plate 2 and the fixed part 32 are fixed, in order to ensure the airtightness of the cover plate, a sealing adhesive 311 is injected into the sealing cavity 31. The material used for the sealing adhesive 311 is one of epoxy resin, polyurethane, and silicone rubber. The material used for the metal plate 2 is stainless steel or aluminum alloy. This not only further enhances the connection strength between the metal plate 2 and the plastic plate 1, but also ensures the airtightness of the metal plate 2 and the plastic plate 1 after connection. When injecting the sealing adhesive 311 into the sealing cavity 31, in order to ensure that the sealing adhesive 311 is evenly distributed in the sealing cavity 31, the metal plate 2 is also provided with several sealing holes 21 that cooperate with the sealing cavity 31. The several sealing holes 21 are evenly arranged along the sealing cavity 31. This allows the sealing adhesive 311 to be evenly distributed on both sides of the metal plate 2 in the sealing cavity 31. At the same time, after the sealing adhesive 311 solidifies, it can further improve the connection strength between the metal plate 2 and the plastic plate 1.

[0022] In summary, this application employs a hybrid connection scheme combining welding and adhesive sealing. This allows the cover plate, after molding, to conveniently connect to the lithium battery casing via the portion of the metal plate 2 extending from the plastic plate 1. Simultaneously, the plastic plate 1 provides good insulation to the lithium battery terminals, thereby improving the overall safety of the lithium battery. It should be noted that while the metal plate 2 and plastic plate 1 are connected after welding, their sealing performance is compromised (especially when using hot-press welding). Therefore, to ensure the connection strength and sealing performance of the metal plate 2 and plastic plate 1, the plastic plate 1 is further provided with a sealing cavity 31 and a fixing part 32 along its circumferential edge, which cooperates with the annular metal plate 2 and is arranged in a convex shape. This allows the metal plate 2 to be connected along the fixing part... 32 extends into the sealing cavity 31. Furthermore, after the sealing adhesive 311 injected into the sealing cavity 31 solidifies, it not only provides a seal but also creates a fixing block (similar to a tenon and mortise connection) on the side of the metal plate 2 that extends into the sealing cavity 31 and locks with the plastic plate 1. The sealing hole 21 on the metal plate 2 allows the sealing adhesive 311 to be evenly distributed on both sides of the metal plate 2. After the sealing adhesive 311 solidifies, it can also form a structure similar to a "pull ring," allowing the metal plate 2 to further tighten the plastic plate 1. Thus, based on the original welding and fixing of the metal plate 2 and the fixing part 32, the entire connection structure of the metal plate 2 and the plastic plate 1 becomes more stable and can more effectively cope with anisotropic tensile, compressive, and shear forces.

[0023] This utility model has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. This utility model is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are all within the protection scope of this utility model.

Claims

1. A metal and plastic integrated lithium battery cover, characterized in that: It includes a plastic plate (1) and a metal plate (2), wherein the metal plate (2) is annular, and the edge of the plastic plate (1) is provided with a connecting part (3) that cooperates with the metal plate (2) along the circumferential direction; The connecting part (3) includes a sealing cavity (31) and a fixing part (32). The sealing cavity (31) and the fixing part (32) are arranged in a convex shape. When connected, the inner side of the metal plate (2) extends into the sealing cavity (31) along the fixing part (32), and the outer side of the metal plate (2) extends out of the plastic plate (1). The metal plate (2) and the fixing part (32) are fixedly connected. The sealing cavity (31) is filled with sealing adhesive (311).

2. The integrated metal and plastic lithium battery cover according to claim 1, characterized in that, The metal plate (2) is also provided with a plurality of sealing holes (21) that cooperate with the sealing cavity (31), and the plurality of sealing holes (21) are evenly arranged along the sealing cavity (31).

3. The integrated metal and plastic lithium battery cover according to claim 2, characterized in that, The width a of the metal plate (2) extending out of the plastic plate (1) is not higher than 1 / 5 of the width b of the metal plate (2), and the width c of the fixed part (32) is not lower than 1 / 3 of the width b of the metal plate (2).

4. The integrated metal and plastic lithium battery cover according to claim 1, characterized in that, The metal plate (2) is made of stainless steel or aluminum alloy.

5. The integrated metal and plastic lithium battery cover according to claim 1, characterized in that, The sealing adhesive (311) material is one of epoxy resin, polyurethane, and silicone rubber.

6. The integrated metal and plastic lithium battery cover according to claim 1, characterized in that: The metal plate (2) and the fixed connection part (32) are fixedly connected by either laser welding or hot-press welding.

7. The integrated metal and plastic lithium battery cover according to claim 1, characterized in that, The top of the plastic plate (1) is also provided with a pole hole (11) and a liquid injection port (12).

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