A power battery top cover

Abstract

This utility model relates to a power battery top cover, comprising: a top cover sheet having vent holes; and a vent valve assembly disposed above the top cover sheet and covering the vent holes. The top cover sheet has an annular base surrounding the vent valve assembly, the annular base being bent inward to form a pressing edge, the pressing edge being pressed against the upper surface edge of the vent valve assembly, thereby fixing the vent valve assembly between the pressing edge and the top cover sheet. This utility model can improve the manufacturing yield, reliability, and safety of power battery top covers.

Description

Technical Field

[0001] This utility model relates to the field of power batteries, and more specifically, to a power battery top cover. Background Technology

[0002] Currently, the vent valve on the top cover of a power battery, as a critical safety component, is generally connected to the top cover plate by welding. However, the welding process is unstable and prone to defects such as weld holes, sparks, incomplete welds, and misaligned welds, leading to airtightness failure. The high temperatures generated during welding can cause thermal damage to the plastic parts in the vent valve, resulting in problems such as scorching and insufficient adhesive, seriously affecting the normal function and sealing reliability of the valve body, resulting in low product yield and high production costs. Utility Model Content

[0003] The purpose of this utility model is to provide a power battery top cover that can improve the manufacturing yield, reliability and safety of the power battery top cover.

[0004] A power battery top cover, comprising: The top cover has ventilation holes; A vent valve assembly is disposed above the top cover plate and covers the vent hole; The top cover has an annular base surrounding the vent valve assembly. The annular base is bent inward to form a pressing edge, which is pressed against the upper surface edge of the vent valve assembly to fix the vent valve assembly between the pressing edge and the top cover.

[0005] In the above technical solution, by setting an annular base on the top cover plate and bending it inward to form a pressing edge, the vent valve assembly is pressed and fixed. Its structure is stable and simple to process, replacing the traditional welding fixing method. It avoids defects such as weld holes, explosions, incomplete welds and weld deviations that occur during the welding process. At the same time, it eliminates the risk of thermal damage to the vent valve assembly caused by the high temperature of welding, and significantly improves the assembly yield and product reliability.

[0006] Furthermore, a first sealing ring is provided between the vent valve assembly and the top cover plate.

[0007] In the above technical solution, by setting a first sealing ring between the vent valve assembly and the top cover plate, the airtightness of the battery at the vent valve of the top cover is enhanced, effectively preventing electrolyte leakage or intrusion of external contaminants, and improving the safety and service life of the battery.

[0008] Furthermore, the top cover is provided with an annular positioning groove, and the first sealing ring is embedded between the annular positioning groove and the vent valve assembly.

[0009] In the above technical solution, by setting an annular positioning groove on the top cover plate and installing the first sealing ring in the annular positioning groove, the positioning of the first sealing ring is accurate and the assembly is stable. While ensuring the sealing effect, displacement during pressing or use is avoided, thus ensuring the stability of the overall structure.

[0010] Furthermore, a second sealing ring is provided between the vent valve assembly and the pressing edge.

[0011] In the above technical solution, by adding a second sealing ring between the vent valve assembly and the pressing edge, a sealing barrier is formed at the interface where the pressing edge contacts the vent valve assembly, which further improves the sealing effect of the overall structure and eliminates the possibility of gas leakage from the pressing contact surface.

[0012] Furthermore, the vent valve assembly includes a temperature-sensitive plastic part and a support member, the support member being disposed on the side of the temperature-sensitive plastic part facing the top cover plate.

[0013] In the above technical solution, a support component is set in the vent valve assembly below the temperature-sensitive plastic part, which can play a role in mechanical support and stress buffering, protecting the temperature-sensitive plastic part from deformation or damage during the pressing process, and at the same time helping to transmit temperature and pressure more evenly.

[0014] Furthermore, the upper end face of the temperature-sensitive plastic part is provided with a boss, and the second sealing ring is sleeved on the outer periphery of the boss and sandwiched between the pressing edge and the temperature-sensitive plastic part.

[0015] In the above technical solution, the boss structure on the upper end face of the temperature-sensitive plastic part is used in conjunction with the second sealing ring to make the sealing ring installation position more precise and the pressure more uniform, thereby enhancing the tightness and consistency of the seal between the pressing edge and the valve body and preventing the sealing ring from being misaligned or failing.

[0016] Furthermore, the support is made of a thermally conductive material.

[0017] In the above technical solution, the support component is made of a high thermal conductivity material, which can transfer the heat inside the battery to the temperature-sensitive element of the vent valve in a timely manner, improve its temperature response sensitivity, ensure that the valve operates in a timely manner at the predetermined temperature, and improve the thermal safety performance of the battery.

[0018] Furthermore, a support member is provided on the side of the top cover away from the vent valve assembly.

[0019] In the above technical solution, a support component is provided below the top cover sheet, which can improve the structural strength and overall deformation resistance of the top cover sheet, making the structure more stable, and at the same time providing a reliable mounting support surface for the internal battery components.

[0020] Compared with the prior art, the beneficial effects of this utility model are: by setting an annular base on the top cover plate and bending it inward to form a pressing edge, the vent valve assembly is pressed and fixed. Its structure is stable and simple to process, replacing the traditional welding fixing method, avoiding defects such as weld holes, explosions, incomplete welds and weld deviations generated during the welding process, and eliminating the risk of thermal damage to the vent valve assembly caused by high welding temperature, which significantly improves the assembly yield and product reliability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the power battery top cover according to an embodiment of the present utility model.

[0022] Figure 2 This is a cross-sectional structural diagram of the power battery top cover according to an embodiment of the present utility model.

[0023] Figure 3 This is a schematic diagram of the structure of the annular base of the power battery top cover before bending, according to an embodiment of this utility model.

[0024] Explanation of icon numbers: Top cover 1, annular base 11, pressing edge 12, vent hole 13, annular positioning groove 14, vent valve assembly 2, temperature-sensitive plastic part 21, boss 211, support 22, first sealing ring 3, second sealing ring 4, bearing 5. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] Please refer to Figures 1 to 3In a preferred embodiment, the power battery top cover of this utility model mainly includes a top cover sheet 1 and a vent valve assembly 2. The top cover sheet 1 has vent holes 13, and the vent valve assembly 2 is disposed above the top cover sheet 1 and covers the vent holes 13. An annular base 11 is provided around the vent valve assembly 2 on the top cover sheet 1. The annular base 11 is bent inward to form a pressing edge 12, which is pressed against the upper surface edge of the vent valve assembly 2, fixing the vent valve assembly 2 between the pressing edge 12 and the top cover sheet 1.

[0028] For example, the upper surface of the top cover 1 has a groove corresponding to the vent hole 13. The vent valve assembly 2 is disposed in the groove and coaxial with the vent hole 13. The height of the groove matches the thickness of the vent valve assembly 2. The outer periphery of the groove extends vertically upward to form an annular base 11. During assembly, the vent valve assembly 2 is placed in the groove, and the annular base 11 is bent inward by a rotation pressing process to form a pressing edge 12 pressed against the edge of the vent valve assembly 2.

[0029] By setting an annular base 11 on the top cover plate 1 and bending it inward to form a pressing edge 12, the vent valve assembly 2 is pressed and fixed. Its structure is stable and simple to process, replacing the traditional welding fixing method. It avoids defects such as weld holes, explosions, incomplete welds and weld deviations that occur during the welding process. At the same time, it eliminates the risk of thermal damage to the vent valve assembly 2 caused by high welding temperature, and significantly improves the assembly yield and product reliability.

[0030] In this embodiment, a first sealing ring 3 is provided between the vent valve assembly 2 and the top cover plate 1. The first sealing ring 3 can be made of existing plastic materials. By providing the first sealing ring 3 between the vent valve assembly 2 and the top cover plate 1, the airtightness of the battery at the vent valve of the top cover is enhanced, effectively preventing electrolyte leakage or intrusion of external contaminants, and improving the safety and service life of the battery.

[0031] The top cover plate 1 is provided with an annular positioning groove 14, and the first sealing ring 3 is embedded between the annular positioning groove 14 and the vent valve assembly 2. For example, the diameter of the annular positioning groove 14 matches the diameter of the first sealing ring 3, and the height of the annular positioning groove 14 is less than the height of the first sealing ring 3, thereby ensuring that the first sealing ring 3 can abut against the lower end face of the vent valve assembly 2. By providing an annular positioning groove 14 on the top cover plate 1 and installing the first sealing ring 3 within the annular positioning groove 14, the accurate positioning and stable assembly of the first sealing ring 3 are ensured. This guarantees the sealing effect while preventing displacement during pressing or use, thus ensuring the stability of the overall structure.

[0032] In this embodiment, a second sealing ring 4 is provided between the vent valve assembly 2 and the pressing edge 12. The second sealing ring 4 can be made of existing plastic materials. By adding the second sealing ring 4 between the vent valve assembly 2 and the pressing edge 12, a sealing barrier is formed at the interface where the pressing edge 12 contacts the vent valve assembly 2, further improving the sealing effect of the overall structure and eliminating the possibility of gas leakage from the pressing contact surface.

[0033] In this embodiment, the vent valve assembly 2 includes a temperature-sensitive plastic part 21 and a support member 22, with the support member 22 disposed on the side of the temperature-sensitive plastic part 21 facing the top cover plate 1. The support member 22, positioned below the temperature-sensitive plastic part 21 in the vent valve assembly 2, provides mechanical support and stress buffering, protecting the temperature-sensitive plastic part 21 from deformation or damage during the pressing process, and also helps to transmit temperature and pressure more evenly.

[0034] The support component 22 is made of a thermally conductive material. Made of a highly thermally conductive material, the support component 22 can promptly transfer heat from inside the battery to the temperature-sensitive element of the vent valve, improving its temperature response sensitivity, ensuring the valve operates promptly at the predetermined temperature, and enhancing the battery's thermal safety performance.

[0035] In this embodiment, a boss 211 is provided on the upper end face of the temperature-sensitive plastic part 21, and the second sealing ring 4 is sleeved on the outer periphery of the boss 211 and sandwiched between the pressing edge 12 and the temperature-sensitive plastic part 21. By utilizing the structure of the boss 211 on the upper end face of the temperature-sensitive plastic part 21 in conjunction with the sleeved second sealing ring 4, the installation position of the sealing ring is more precise and the pressure is more uniform, which enhances the tightness and consistency of the seal between the pressing edge 12 and the valve body, and prevents the sealing ring from being misaligned or failing.

[0036] A support member 5 is provided on the side of the top cover plate 1 away from the vent valve assembly 2. The support member 5 can be made of plastic. By setting the support member 5 under the top cover plate 1, the structural strength and overall deformation resistance of the top cover plate 1 can be improved, making the structure more stable, while providing a reliable mounting support surface for the internal battery components.

[0037] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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.

[0038] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A power battery top cover, characterized in that, include: The top cover has ventilation holes; A vent valve assembly is disposed above the top cover plate and covers the vent hole; The top cover has an annular base surrounding the vent valve assembly. The annular base is bent inward to form a pressing edge, which is pressed against the upper surface edge of the vent valve assembly to fix the vent valve assembly between the pressing edge and the top cover.

2. The power battery top cover according to claim 1, characterized in that, A first sealing ring is provided between the vent valve assembly and the top cover plate.

3. The power battery top cover according to claim 2, characterized in that, The top cover is provided with an annular positioning groove, and the first sealing ring is embedded between the annular positioning groove and the vent valve assembly.

4. The power battery top cover according to claim 1, characterized in that, A second sealing ring is provided between the vent valve assembly and the pressing edge.

5. The power battery top cover according to claim 4, characterized in that, The vent valve assembly includes a temperature-sensitive plastic part and a support member, the support member being disposed on the side of the temperature-sensitive plastic part facing the top cover plate.

6. The power battery top cover according to claim 5, characterized in that, The upper end face of the temperature-sensitive plastic part is provided with a boss, and the second sealing ring is sleeved on the outer periphery of the boss and sandwiched between the pressing edge and the temperature-sensitive plastic part.

7. The power battery top cover according to claim 5, characterized in that, The support component is made of thermally conductive material.

8. The power battery top cover according to claim 1, characterized in that, The top cover plate has a support member on the side away from the vent valve assembly.

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