A battery top cover structure

Abstract

This utility model discloses a battery top cover structure, including a top cover plate and a stop bracket. An explosion-proof valve is installed in the center of the top cover plate, and an explosion-proof patch is provided on the explosion-proof valve. It also includes an upper plastic layer. The top cover plate has two terminal holes for installing the positive and negative terminals, respectively. A ring of inverted fastening structure is provided above the terminal holes to secure the upper plastic layer. The upper plastic layer integrates a sealing ring, with both its upper and lower parts participating in sealing. This inverted fastening structure differs from conventional flat or simple through-hole designs. Through mechanical locking, it ensures that the upper plastic layer is not easily displaced or detached after assembly, providing a structural foundation for the upper plastic layer to stably perform its sealing functions. It effectively resists external forces such as vibration and impact during battery use, ensuring the overall structural stability of the power lithium battery. The upper plastic layer integrates the sealing ring function, reducing independent sealing ring parts, simplifying the structure and assembly, and with both upper and lower parts participating in sealing, it breaks through the traditional single sealing path, constructing a double sealing guarantee.

Description

Technical Field

[0001] This utility model relates to the field of power lithium battery technology, and in particular to a battery top cover structure. Background Technology

[0002] With the rapid development of the power lithium battery industry, the safety requirements for battery cells continue to rise, placing higher standards on the structural stability, overall safety, and reliability of the battery top cover. The existing battery top cover structure consists of the positive and negative terminals passing sequentially through a sealing ring, a retaining frame, and a top cover sheet. The positive and negative terminals are then molded together using an injection mold, and an explosion-proof valve is installed in the center of the top cover sheet. Finally, an explosion-proof patch is affixed to the explosion-proof valve for physical protection.

[0003] However, the current battery top cover structure is insufficient to fully meet the increasingly stringent technical requirements of power lithium batteries in terms of sealing performance, component integration, and ease of assembly, and there is room for optimization and improvement.

[0004] Therefore, there is an urgent need for a more advantageous battery top cover structure. Utility Model Content

[0005] To address the technical problems existing in the background art, this utility model proposes a battery top cover structure.

[0006] This utility model proposes a battery top cover structure, including a top cover plate and a stop bracket. An explosion-proof valve is installed in the middle of the top cover plate, and an explosion-proof patch is provided on the explosion-proof valve. It also includes an upper plastic. The top cover plate has two terminal holes for installing the positive terminal and the negative terminal, respectively. The upper part of the terminal hole is provided with an inverted buckle structure that can hold the upper plastic. The upper plastic integrates a sealing ring, which participates in sealing from both the top and bottom.

[0007] Preferably, the upper plastic sheet has multiple hot-melt structures at its central position, which can be hot-melted to the top cover sheet.

[0008] Preferably, the upper plastic and the sealing ring are integrated into one structure.

[0009] Preferably, the battery further includes a positive electrode welding block and a negative electrode welding block. The positive electrode welding block is located at the upper end of the upper plastic of the positive electrode post and cooperates with the positive electrode welding piece of the positive electrode post. The negative electrode welding block is located at the upper end of the upper plastic of the negative electrode post and cooperates with the negative electrode welding piece of the negative electrode post, forming a battery current conduction path.

[0010] Preferably, the positive electrode welding block and the positive electrode welding sheet, and the negative electrode welding block and the negative electrode welding sheet are connected by lap welding at the assembly position.

[0011] Preferably, the outer center of the upper plastic is provided with a snap groove that engages with the inverted snap structure.

[0012] In summary, this utility model has the following beneficial effects: The inverted buckle structure set at the terminal hole on the top cover plate, unlike the conventional flat or simple through hole design, ensures that the upper plastic is not easily displaced or detached after assembly through mechanical structure positioning, providing a structural foundation for the upper plastic to stably perform its sealing and other functions, effectively resisting external forces such as vibration and impact during battery use, and ensuring the overall structural stability of the power lithium battery; The upper plastic integrates the sealing ring function, reducing independent sealing ring parts, simplifying the structure and assembly, and the upper and lower parts participate in sealing, breaking through the traditional single sealing path and constructing a double sealing guarantee.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] Figure 1 This is an exploded view of the battery top cover structure according to an embodiment of the present invention;

[0015] Figure 2 This is a partial structural schematic diagram of the top cover sheet according to an embodiment of the present utility model;

[0016] Figure 3 This is a cross-sectional view of the upper plastic in an embodiment of the present invention;

[0017] Figure 4 This is a cross-sectional view of the top cover structure according to an embodiment of the present utility model;

[0018] Figure 5 for Figure 4 Enlarged view of point A.

[0019] In the picture:

[0020] 1. Top cover plate; 11. Pole post hole; 111. Inverted structure; 2. Stop bracket; 3. Explosion-proof valve; 4. Explosion-proof patch; 5. Top plastic; 51. Clip groove; 6. Positive electrode welding block; 7. Negative electrode welding block; 8. Positive electrode welding piece; 9. Negative electrode welding piece. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0022] like Figure 1-5As shown, the battery top cover structure proposed in this embodiment includes a top cover plate 1 and a stop frame 2. An explosion-proof valve 3 is installed in the middle of the top cover plate 1. An explosion-proof patch 4 is provided on the explosion-proof valve 3. It also includes an upper plastic 5. The top cover plate 1 has two terminal hole 11 for installing the positive terminal and the negative terminal respectively. The upper part of the terminal hole 11 is provided with an inverted buckle structure 111 that can lock the upper plastic 5. The upper plastic 5 integrates a sealing ring, and both its upper and lower parts participate in the sealing.

[0023] Specifically, the outer center of the upper plastic 5 is provided with a snap groove 51 that engages with the inverted snap structure 111, and the inverted snap structure 111 is snapped into the snap groove 51.

[0024] Thus, the inverted buckle structure 111 at the terminal hole 11 on the top cover 1, unlike the conventional flat or simple through-hole design, uses a mechanical structure to ensure that the upper plastic 5 is not easily displaced or detached after assembly. This provides a structural foundation for the upper plastic 5 to stably perform its sealing functions, effectively resisting external forces such as vibration and impact during battery use, and ensuring the overall structural stability of the power lithium battery. The upper plastic 5 integrates a sealing ring function, reducing independent sealing ring parts, simplifying the structure and assembly, and participating in sealing from both the top and bottom, breaking through the traditional single sealing path and constructing a double sealing guarantee. This improves the stability, sealing performance, and production efficiency of the power lithium battery top cover, enhancing the overall safety and reliability of the power lithium battery.

[0025] Furthermore, the upper plastic 5 has multiple heat-melting structures near its center, which can be heat-melted to the top cover plate 1. Specifically, there are four heat-melting structures. The heat-melting process is used to heat-melt the upper plastic 5 onto the top cover plate 1, preventing the upper plastic 5 from lifting up. At the same time, the sealing reliability of the top cover is improved by utilizing the sealing characteristics of the upper plastic 5 from both the top and bottom.

[0026] Furthermore, the upper plastic 5 and the sealing ring are designed as an integrated structure, simplifying the structural process. The upper plastic 5 and the sealing ring are integrated and sealed from top to bottom, while the top cover plate 1 and the upper plastic 5 are interlocked for sealing. This multi-layer sealing design works synergistically, which, compared to the traditional top cover structure, can more effectively prevent electrolyte leakage, external moisture and impurities from entering, improve the stability of the battery's internal environment, and extend the battery's lifespan.

[0027] In this embodiment, a positive electrode welding block 6 and a negative electrode welding block 7 are also included. The positive electrode welding block 6 is located at the upper end of the upper plastic 5 of the positive electrode post and cooperates with the positive electrode welding piece 8 of the positive electrode post. The negative electrode welding block 7 is located at the upper end of the upper plastic 5 of the negative electrode post and cooperates with the negative electrode welding piece 9 of the negative electrode post to form a battery current conduction path.

[0028] Specifically, the positive electrode welding block 6 and the positive electrode welding piece 8, and the negative electrode welding block 7 and the negative electrode welding piece 9 are connected by lap welding at the assembly position. This forms a complete and fixed battery top cover assembly, realizing the construction of the current conduction path and the stable connection of components. Compared with traditional welding or connection processes, lap welding can more precisely control the welding position and strength, ensuring reliable electrical connection while improving assembly efficiency and structural stability.

[0029] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on 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, an electrical connection, or a connection that allows communication between them; 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] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A battery top cover structure, comprising a top cover plate and a stop frame, wherein an explosion-proof valve is installed in the middle of the top cover plate, and an explosion-proof patch is provided on the explosion-proof valve, characterized in that, It also includes an upper plastic sheet, on which two electrode holes are provided for installing the positive electrode and the negative electrode respectively. The upper part of the electrode hole is provided with an inverted buckle structure that can hold the upper plastic sheet in place. The upper plastic sheet integrates a sealing ring, which participates in sealing from both the top and bottom.

2. The battery top cover structure according to claim 1, characterized in that, The upper plastic sheet has multiple hot-melt structures at its central position, which can be hot-melted to the top cover sheet.

3. The battery top cover structure according to claim 1, characterized in that, The upper plastic and the sealing ring are designed as an integral structure.

4. The battery top cover structure according to claim 1, characterized in that, It also includes a positive electrode welding block and a negative electrode welding block. The positive electrode welding block is located at the upper end of the upper plastic of the positive electrode post and cooperates with the positive electrode welding piece of the positive electrode post. The negative electrode welding block is located at the upper end of the upper plastic of the negative electrode post and cooperates with the negative electrode welding piece of the negative electrode post, forming a battery current conduction path.

5. The battery top cover structure according to claim 4, characterized in that, The positive electrode welding block and the positive electrode welding sheet, and the negative electrode welding block and the negative electrode welding sheet are connected by lap welding at the assembly position.

6. The battery top cover structure according to claim 1, characterized in that, The outer center of the upper plastic body is provided with a snap groove that engages with the inverted snap structure.

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