Self-riveting pole assembly and battery top cover

Abstract

The utility model discloses a self-riveting pole assembly and a battery top cover, the self-riveting pole assembly comprises a convex terminal and a concave compression ring, the convex part of the convex terminal is matched with the groove of the concave compression ring, the inner side of the groove of the concave compression ring is provided with a first avoiding groove, the outer side of the groove of the concave compression ring is provided with a second avoiding groove opposite to the opening of the groove, and the convex part of the convex terminal is matched with the groove of the concave compression ring. When the convex terminal and the concave compression ring are in self-riveting connection, the convex part of the convex terminal is extruded to deform and is in interference fit with the first avoiding groove, and the first avoiding groove is extruded by the convex part of the convex terminal and deforms towards the second avoiding groove, so that the convex terminal and the concave compression ring form self-riveting interference fit connection. According to the invention, based on the self-riveting connection between the convex terminal and the concave compression ring, the convex part of the convex terminal is in interference fit with the first avoiding groove formed in the concave compression ring due to extrusion deformation, so that the self-riveting stable connection of the pole assembly without filling materials is realized; the circuit has the characteristics of simple assembly, low resistance, high reliability, long service life and low cost.

Description

Technical Field

[0001] This utility model relates to the field of battery terminal assembly and battery top cover technology, and in particular to a self-riveting terminal assembly and battery top cover. Background Technology

[0002] Against the backdrop of the rapid development of the new energy vehicle and energy storage battery industries, power batteries and energy storage systems are facing higher requirements for energy density, cycle life, and manufacturing costs. Electrode materials, as core components enabling battery charging and discharging, directly affect the overall performance of the battery. Currently, copper-aluminum composite materials, with the advantages of copper's high conductivity and aluminum's lightweight and low cost, are widely used in the negative electrode current collectors of power batteries and the electrode structures of energy storage batteries.

[0003] Traditional copper-aluminum composite electrode structures primarily employ welding or mechanical pressing processes to connect the copper and aluminum. Welding processes, such as ultrasonic welding and laser welding, easily generate brittle intermetallic compounds (e.g., CuAl2, Cu9Al4) at the copper-aluminum interface due to high temperatures. These compounds not only have poor conductivity (only 1 / 10 to 1 / 20 that of copper) but also continuously grow with battery charge-discharge cycles, leading to a sustained increase in electrode impedance and severely impacting battery charge-discharge efficiency and cycle life. Simultaneously, the high temperatures during welding can cause material deformation, disrupting the flatness of the electrode structure and reducing battery assembly consistency. While mechanical pressing avoids thermal effects, it struggles to ensure tight contact at the copper-aluminum interface. Under the stress generated by frequent battery charge-discharge cycles, the contact interface is prone to gaps due to creep and fretting wear, resulting in increased contact resistance. Furthermore, existing copper-aluminum composite electrode structures typically require an additional negative electrode sheet or intermediate transition layer (e.g., a nickel layer) for electrical connection and mechanical fixation. This not only increases the battery's material cost and assembly complexity but also introduces additional interface resistance, limiting the improvement of battery energy density. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a self-riveting terminal assembly and a battery top cover, including a convex terminal and a concave pressure ring. The convex part of the convex terminal matches the groove of the concave pressure ring. The inner side of the groove of the concave pressure ring is provided with a first clearance groove, and the outer side of the groove of the concave pressure ring is provided with a second clearance groove opposite to the groove opening. When the convex terminal and the concave pressure ring are self-riveted, the convex part of the convex terminal is squeezed and deformed and makes an interference fit with the first clearance groove. The first clearance groove is squeezed by the convex part of the convex terminal and deformed toward the second clearance groove, thereby making the convex terminal and the concave pressure ring form a self-riveting interference fit connection.

[0005] In some embodiments, the side of the convex terminal away from the convex portion is provided with a guide groove that matches and engages with an external pressure-applying device.

[0006] This application also provides a self-riveting battery top cover, comprising a top cover body, a lower plastic, and a self-riveting terminal assembly as described in any one of the claims. The top cover body is located above the lower plastic, and both the top cover body and the lower plastic have two symmetrical through holes for mounting the self-riveting terminal assembly. Each concave pressure ring has an extension connected to its outer side, and the extension and the outer side of the corresponding convex terminal form a cavity. A sealing ring and an upper plastic are provided in the cavity. The upper plastic is disposed between the top cover body and the convex terminal, and the sealing ring is disposed between the top cover body and the concave pressure ring and is mated with the lower plastic in the cavity.

[0007] In some embodiments, explosion-proof holes are provided on the top cover body and the lower plastic, and explosion-proof valves are installed in the explosion-proof holes.

[0008] In some embodiments, the upper side of the explosion-proof valve is covered with a protective film.

[0009] Compared with existing technologies, the self-riveting terminal assembly and battery top cover provided in this application have the following advantages: the terminal assembly is matched and connected by the convex part of the convex terminal and the groove of the concave pressure ring. Under the action of an external pressure device, the convex part of the convex terminal is squeezed and deformed and makes an interference fit with the first relief groove provided on the inner side of the concave pressure ring. Moreover, the first relief groove is deformed towards the second relief groove by the squeezing force of the convex part of the convex terminal. Ultimately, the convex terminal and the concave pressure ring are connected by a self-riveting interference fit, realizing a stable connection of the terminal assembly without filler material. It has the characteristics of simple assembly, low resistance, high reliability, long life and low cost. At the same time, the battery top cover containing this terminal assembly meets the electrical performance requirements and mechanical strength requirements of the battery electrode charge and discharge cycle. Attached Figure Description

[0010] Figure 1 This is a structural schematic diagram of the self-riveting pole assembly in some embodiments of this application.

[0011] Figure 2 This is a schematic diagram of the structure of the self-riveting battery top cover before self-riveting connection in some embodiments of this application.

[0012] In the figure: 1. Convex terminal, 2. Concave pressure ring, 3. First clearance groove, 4. Second clearance groove, 5. Guide groove, 6. Top cover body, 7. Lower plastic, 8. Extension, 9. Cavity, 10. Sealing ring, 12. Explosion-proof valve, 13. Protective film. Detailed Implementation

[0013] To facilitate understanding of the structure and operation of this utility model, the following description, in conjunction with the accompanying drawings and optimized embodiments, provides a more comprehensive and detailed account of the utility model. However, the scope of protection of this utility model is not limited to the specific embodiments described below. It should be noted that, without affecting the effectiveness of use, the structural features and component dimensions, connection methods, and device sizes in the embodiments of this utility model can be changed.

[0014] Unless otherwise defined, all technical terms used below have the same meaning as commonly understood by those skilled in the art. The terms "first," "second," and similar terms used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely for the purpose of distinguishing corresponding components. Similarly, "a" or "one," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "connection" or "connection" are not limited to direct connections, but can refer to indirect connections through other intermediate connecting parts. Terms such as "above," "below," "one side," "the other side," "vertical," and "horizontal" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship also changes accordingly. It should be noted that, in this embodiment, ... Figure 1 For example, vertically facing up is "up", vertically facing down is "down", vertically facing left is "left", and vertically facing right is "right".

[0015] like Figure 1 , Figure 2 As shown, the present invention provides a self-riveting terminal assembly and battery top cover, including a convex terminal 1 and a concave pressure ring 2. The convex part of the convex terminal 1 matches the groove of the concave pressure ring 2. The inner side of the groove of the concave pressure ring 2 is provided with a first clearance groove 3, and the outer side of the groove of the concave pressure ring 2 is provided with a second clearance groove 4 opposite to the groove opening. When the convex terminal 1 and the concave pressure ring 2 are self-riveted, the convex part of the convex terminal 1 is squeezed and deformed and is in interference fit with the first clearance groove 3. The first clearance groove 3 is squeezed by the convex part of the convex terminal 1 and deformed toward the second clearance groove 4, thereby making the convex terminal 1 and the concave pressure ring 2 form a self-riveting interference fit connection.

[0016] In the above embodiment, the pole assembly first matches and connects the convex part of the convex terminal 1 with the groove of the concave pressure ring 2. Then, under the action of an external pressure device, the convex part of the convex terminal 1 is squeezed and deformed and is interference-fitted with the first relief groove 3 provided on the inner side of the concave pressure ring 2. At this time, the first relief groove 3 is filled by the deformed convex part of the concave terminal 1, thus forming an interference fit state. Moreover, the first relief groove 3 is squeezed by the convex part of the convex terminal 1 and deforms towards the second relief groove 4. In order to ensure the overall shape and structure of the second relief groove 4, an external wedge block can be pre-set in the second relief groove 4 to control the side wall deformation structure between the first relief groove 3 and the second relief groove 4. Finally, the convex terminal 1 and the concave pressure ring 2 are both self-riveted interference fit connections, realizing a stable connection of the pole assembly without filler material. It has the characteristics of simple assembly, low resistance, high reliability, long life and low cost.

[0017] In some embodiments, the convex terminal 1 has a guide groove 5 on the side away from the convex portion that matches and engages with an external pressure-applying device.

[0018] In the above embodiments, when an external pressure device is required to provide force, the force is applied to the side of the convex terminal 1 away from the convex portion ( Figure 1 The guide groove 5 is provided on the upper side (as indicated in the text). The guide groove 5 can be used to quickly position the external pressure device, which improves the work efficiency to a certain extent. It should be noted that when the external pressure device applies force to the convex terminal 1 based on the guide groove 5 and rivets the convex terminal 1 to the concave pressure ring 2, two steps will be formed in the guide groove 5. If there is only one step in the guide groove 5 after the convex terminal 1 and the concave pressure ring 2 are riveted, the material around the guide groove 3 may flow downward naturally, thus forming a rounded corner. Such a structure will affect the flatness of the upper surface of the convex terminal 1. However, the formation of two steps after the convex terminal 1 and the concave pressure ring 2 are riveted will not affect the flatness of the upper surface of the convex terminal 1.

[0019] This application also provides a self-riveting battery top cover, comprising a top cover body 6, a lower plastic 7, and the aforementioned self-riveting terminal assembly. The top cover body 6 is located above the lower plastic 7, and both the top cover body 6 and the lower plastic 7 are symmetrically provided with two through holes (not shown in the figure) for installing the self-riveting terminal assembly. Each concave pressure ring 2 has an extension 8 connected to its outer side. The extension 8 and the corresponding convex terminal 1 form a cavity 9. A sealing ring 10 and an upper plastic 11 are provided in the cavity 9. The upper plastic 11 is disposed between the top cover body 6 and the convex terminal 1, and the sealing ring 10 is disposed between the top cover body 6 and the concave pressure ring 2 and is connected to the lower plastic 7 in the cavity 9.

[0020] In the above embodiment, two self-riveting terminal assemblies are respectively installed in the two through holes on the battery top cover, including a positive terminal assembly and a negative terminal assembly. The convex terminals 1 in the terminal assemblies are all convex aluminum terminals, the concave pressure ring 2 in the positive terminal assembly is a concave aluminum pressure ring, and the concave pressure ring 2 in the negative terminal assembly is a concave copper pressure ring. The extension 8 on the outer side of the concave pressure ring 2 forms a cavity 9 with the convex terminal 1. By setting a sealing ring 10 and an upper plastic 11 in the cavity 9, the upper plastic 11 effectively prevents direct contact between the convex terminal 1 and the top cover body 6, ensuring insulation between them. Similarly, the sealing ring 10 effectively prevents direct contact between the concave pressure ring 2 and the top cover body 6, ensuring insulation between them. Therefore, the self-riveting terminal assemblies installed in the through holes create a seal between the inside and outside of the battery top cover. Therefore, the self-riveting battery top cover provided in this application also has the characteristics of simple assembly, low resistance, high reliability, long life and low cost, while meeting the electrical performance requirements and mechanical strength requirements of battery electrodes in charge and discharge cycles.

[0021] In some embodiments, explosion-proof holes are provided on the top cover body 6 and the lower plastic 7, and an explosion-proof valve 12 is installed in the explosion-proof holes.

[0022] In the above embodiments, by providing an explosion-proof valve 12 on the battery top cover, the safety of the battery under the battery top cover is ensured.

[0023] In some embodiments, the upper side of the explosion-proof valve 12 is covered with a protective film 13.

[0024] In the above embodiments, by covering the upper side of the explosion-proof valve 12 with a protective film 13, the explosion-proof valve 12 can be protected by the protective film 13, thereby extending the service life of the explosion-proof valve 12.

[0025] The above provides a detailed description of the self-riveting terminal assembly and battery top cover provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A self-riveting pole assembly, characterized in that, The device includes a convex terminal (1) and a concave pressure ring (2). The convex part of the convex terminal (1) matches the groove of the concave pressure ring (2). The inner side of the groove of the concave pressure ring (2) is provided with a first clearance groove (3), and the outer side of the groove of the concave pressure ring (2) is provided with a second clearance groove (4) opposite to the opening of the groove. When the convex terminal (1) and the concave pressure ring (2) are self-riveted, the convex part of the convex terminal (1) is squeezed and deformed and is in interference fit with the first clearance groove (3). The first clearance groove (3) is squeezed by the convex part of the convex terminal (1) and deformed toward the second clearance groove (4), thereby making the convex terminal (1) and the concave pressure ring (2) form a self-riveting interference fit connection.

2. The self-riveting pole assembly as described in claim 1, characterized in that, The convex terminal (1) has a guide groove (5) on the side away from the convex part that is matched and connected with the external pressure device.

3. A self-riveting battery top cover, characterized in that, The assembly includes a top cover body (6), a lower plastic (7), and a self-riveting pole assembly as described in any one of claims 1-2. The top cover body (6) is located above the lower plastic (7), and both the top cover body (6) and the lower plastic (7) are symmetrically provided with two through holes for installing the self-riveting pole assembly. Each concave pressure ring (2) has an extension (8) connected to its outer side. The extension (8) and the outer side of the corresponding convex terminal (1) form a cavity (9). A sealing ring (10) and an upper plastic (11) are provided in the cavity (9). The upper plastic (11) is disposed between the top cover body (6) and the convex terminal (1), and the sealing ring (10) is disposed between the top cover body (6) and the concave pressure ring (2) and is connected to the lower plastic (7) in the cavity (9).

4. The self-riveting battery top cover as described in claim 3, characterized in that, The top cover body (6) and the lower plastic (7) are provided with explosion-proof holes, and explosion-proof valves (12) are installed in the explosion-proof holes.

5. The self-riveting battery top cover as described in claim 4, characterized in that, The explosion-proof valve (12) is covered with a protective film (13) on its upper side.

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