Automatic exhaust structure of power battery top cover

Abstract

The utility model relates to an automatic exhaust structure of a power battery top cover, which comprises a top cover piece, a base, a sealing ring, a movable pressing block component and an upper cover, the top cover piece and the base are respectively provided with a first through hole and a second through hole which are axially penetrated along the top cover piece and the base, the base is connected with the top cover piece, the second through hole is opposite to the first through hole, and the movable pressing block component is arranged on the upper cover. The upper cover is in threaded connection with the peripheral side of the base, a first annular boss is arranged on the side wall of the second through hole, one end of the movable pressing block assembly abuts against the first annular boss, the other end of the movable pressing block assembly abuts against the upper cover, and the sealing ring is arranged between the first annular boss and the movable pressing block assembly. And at least one exhaust hole is formed in the peripheral side of the upper cover. According to the utility model, when the internal air pressure of the power battery is too high, the air can be automatically exhausted, and the exhaust hole is automatically sealed after the air is exhausted, so that unnecessary scrapping of the battery is avoided, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery exhaust, in particular to an automatic exhaust structure of a power battery top cover. Background Art

[0002] Batteries generate gas during the charging and discharging process. As the gas continues to increase, the pressure inside the battery will become greater and greater. When the pressure reaches a certain limit, the battery is prone to explosion accidents, causing personal injury to the user. For battery safety design, existing lithium-ion power batteries usually have explosion-proof valves on the top cover. When the pressure generated by the gas inside the battery exceeds the set value, the explosion-proof valve will rupture and open to exhaust, releasing the internal air pressure of the battery, thereby preventing the battery from exploding. Although the setting of the explosion-proof valve can effectively prevent battery fraud, the damage to the battery caused by the rupture of the explosion-proof valve is irreversible. Once the explosion-proof valve ruptures, the battery needs to be scrapped, which not only has a certain impact on the battery life, but also creates a lot of pressure for the battery handling.

[0003] Therefore, there is an urgent need for an automatic exhaust structure that can automatically exhaust the gas in time when the internal gas pressure of the power battery is too high, and can automatically seal the exhaust hole after the gas pressure drops to a certain level, achieving the effect of automatic exhaust and automatic sealing, thereby increasing the battery life. Utility Model Content

[0004] The utility model aims to provide an automatic exhaust structure for a power battery top cover, which can automatically exhaust gas when the internal gas pressure of the power battery is too high, and automatically seal the exhaust hole after exhausting, thereby avoiding unnecessary scrapping of the battery and increasing the service life of the battery.

[0005] A power battery top cover automatic exhaust structure comprises a top cover sheet, a base, a sealing ring, a movable pressure block assembly and an upper cover, wherein the top cover sheet and the base are respectively provided with a first through hole and a second through hole extending axially thereof, the base is provided at the upper end of the top cover sheet, and the second through hole is opposite to the first through hole, the upper cover is threadedly connected to the outer periphery of the base, a first annular boss is provided on the side wall of the second through hole, one end of the movable pressure block assembly abuts against the first annular boss, and the other end abuts against the upper cover, the sealing ring is provided between the first annular boss and the movable pressure block assembly to seal the second through hole, and at least one exhaust hole is provided on the peripheral side of the upper cover.

[0006] In the above technical scheme, after the top cover sheet, the base, the sealing ring, the movable pressure block assembly and the upper cover are assembled, the movable pressure block assembly abuts against the base, and the sealing ring is squeezed downward by the movable pressure block assembly, thereby sealing the battery. When the internal air pressure of the battery is greater than the set value, the internal air pressure pushes the movable pressure block assembly upward, and the compression amount of the sealing ring decreases when the compression of the movable pressure block assembly is lost, thereby a gap that is insufficient to seal the battery appears between the base and the movable pressure block assembly, and the gas inside the battery passes through the gap between the base and the movable pressure block assembly, and then discharges from the exhaust hole to release the pressure. After the pressure is released, when the internal gas of the battery is less than the set value, the movable pressure block assembly rebounds, and the compressed sealing ring seals the battery again. When the internal air pressure of the battery is less than the set value, the movable pressure block assembly always abuts against the sealing ring, the compression amount of the sealing ring remains unchanged, there is no gap between the base and the movable pressure block assembly, and the battery is in a sealed state. The utility model realizes that when the internal air pressure of the power battery is too high, the gas can be automatically discharged, and the exhaust hole is automatically sealed after exhausting, thereby avoiding unnecessary scrapping of the battery and improving the service life of the battery.

[0007] Furthermore, the movable pressure block assembly includes a pressure block and a compression spring, wherein the compression spring is arranged between the pressure block and the upper cover, and one end of the pressure block abuts against the sealing ring.

[0008] In the above technical solution, the compression spring is arranged between the pressing block and the upper cover to provide a reset force for the pressing block. When the internal pressure of the battery increases, the pressing block is pushed by the pressure, the compression spring is compressed, and the contact between the pressing block and the sealing ring is broken, so that a gap is generated between the base and the pressing block, allowing the gas to pass through the gap to the exhaust hole and be discharged to the outside. When the pressure returns to normal, the compression spring restores its deformation, pushes the pressing block to reset, re-contacts the sealing ring, and restores the sealing state.

[0009] Furthermore, the first annular boss is provided with a first annular groove, and the sealing ring is provided in the first annular groove.

[0010] In the above technical solution, a first annular groove is provided on the first annular boss, and the sealing ring is installed in the first annular groove, which improves the stability and sealing effect of the sealing ring. The first annular groove provides a clear installation position and fixing method for the sealing ring, preventing the sealing ring from shifting or falling off during use, thereby ensuring the reliability of the seal.

[0011] Furthermore, the top cover sheet is provided with a second annular groove, and a second annular boss adapted to the second annular groove extends from the outer peripheral side of the base close to the top cover sheet.

[0012] In the above technical solution, a second annular groove is provided on the top cover sheet, and a second annular boss adapted to the second annular groove is extended from the outer peripheral side of the base, thereby increasing the connection strength and sealing between the top cover sheet and the base. The cooperation of the second annular groove and the second annular boss makes the connection between the top cover sheet and the base tighter and more stable, and also provides additional support and sealing effect for the sealing ring.

[0013] Furthermore, a first thread is provided on a side of the base away from the second annular boss, a second thread is provided on an inner circumference of the upper cover, and the base is connected to the upper cover via the first thread and the second thread.

[0014] In the above technical solution, the connection method between the base and the upper cover is clarified, that is, the threaded connection through the first thread and the second thread. This connection method is not only stable and reliable, but also easy to install and disassemble. The threaded connection can ensure a tight fit between the base and the upper cover to prevent loosening and leakage; at the same time, it is also convenient for maintenance and replacement when necessary.

[0015] Furthermore, the upper cover is provided with anti-skid convex patterns, and the anti-skid convex patterns are evenly spaced on the outer peripheral side of the upper cover.

[0016] In the above technical solution, anti-skid convex patterns are provided on the upper cover to increase the friction during rotation, making the operation more stable and reliable. The design of the anti-skid convex patterns takes into account the user experience and avoids accidents caused by hand slipping when rotating the upper cover.

[0017] Furthermore, the anti-slip convex pattern extends along the axial direction of the upper cover.

[0018] In the above technical solution, the anti-slip convex pattern extends along the axial direction of the upper cover, so that the user can provide more uniform force distribution and better rotation feel when rotating the upper cover. At the same time, it also increases the stability during the rotation process and prevents the upper cover from deflecting or shaking during the rotation process.

[0019] Furthermore, a hexagonal boss is provided on an end surface of the upper cover away from the base.

[0020] In the above technical solution, a hexagonal boss is provided on the end face of the upper cover away from the base, which is convenient for tightening or disassembling using tools such as wrenches. The design of the hexagonal boss takes into account the convenience of users in actual operation, making the tightening or disassembly process simpler and faster.

[0021] Furthermore, a plastic piece is connected to a side of the top cover away from the base.

[0022] In the above technical solution, a plastic part is connected to the side of the top cover sheet away from the base to increase insulation, protect the top cover sheet from external impact or provide additional sealing effect, etc. The overall performance and safety of the battery top cover are improved to meet the needs of different usage scenarios.

[0023] Compared with the prior art, the utility model has the following beneficial effects: by providing a top cover sheet, a base, a sealing ring, a movable pressure block assembly and an upper cover, the automatic adjustment and exhaust functions of the internal pressure of the battery are realized, thereby improving the battery life. When the internal pressure of the battery increases, the movable pressure block assembly is pushed by the pressure, and the contact between the movable pressure block assembly and the sealing ring is broken, thereby generating a gap between the base and the movable pressure block assembly, allowing the gas to pass through the gap to reach the exhaust hole and be discharged to the outside; after the pressure returns to normal, the movable pressure block assembly contacts the sealing ring again, restores the sealing state, prevents gas leakage, and improves the safety and reliability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the automatic exhaust structure of the power battery top cover according to an embodiment of the utility model.

[0025] Figure 2 It is a schematic diagram of the exploded structure of the automatic exhaust structure of the power battery top cover according to an embodiment of the utility model.

[0026] Figure 3 It is a schematic cross-sectional structure diagram of the automatic exhaust structure of the power battery top cover according to an embodiment of the utility model.

[0027] Figure 4 It is a structural schematic diagram of a base according to an embodiment of the utility model.

[0028] Figure 5 It is a schematic structural diagram of the upper cover of an embodiment of the utility model.

[0029] Description of Figure Numbers

[0030] 1. Top cover sheet; 101. First through hole; 102. Second annular groove;

[0031] 2. Base; 201. Second through hole; 202. First annular boss; 2021. First annular groove; 203. Second annular boss; 204. First thread;

[0032] 3. Sealing ring;

[0033] 4. Movable pressing block assembly; 401. pressing block; 402. compression spring;

[0034] 5. Upper cover; 501. Exhaust hole; 502. Second thread; 503. Anti-slip convex pattern;

[0035] 6. Hexagonal boss;

[0036] 7. Plastic parts. DETAILED DESCRIPTION

[0037] The automatic exhaust structure of the power battery top cover of the utility model will be further described in detail below in combination with specific embodiments and drawings. The drawings show a preferred embodiment of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein.

[0038] Please refer to Figures 1 to 5 In a preferred embodiment, the automatic exhaust structure of the power battery top cover of the utility model includes a top cover sheet 1, a base 2, a sealing ring 3, a movable pressure block assembly 4 and an upper cover 5. The top cover sheet 1 and the base 2 are respectively provided with a first through hole 101 and a second through hole 201 penetrating along their axial direction. The base 2 is arranged at the upper end of the top cover sheet 1, and the second through hole 201 is opposite to the first through hole 101. The upper cover 5 is threadedly connected to the outer peripheral side of the base 2. The side wall of the second through hole 201 is provided with a first annular boss 202. One end of the movable pressure block assembly 4 abuts against the first annular boss 202, and the other end abuts against the upper cover 5. The sealing ring 3 is arranged between the first annular boss 202 and the movable pressure block assembly 4 to seal the second through hole 201. At least one exhaust hole 501 is provided on the peripheral side of the upper cover 5.

[0039] In the actual application process of the above structure, after the top cover sheet 1, the base 2, the sealing ring 3, the movable pressing block assembly 4 and the upper cover 5 are assembled, the movable pressing block assembly 4 abuts against the base 2, and the sealing ring 3 is squeezed downward by the movable pressing block assembly 4, thereby sealing the battery. When the internal air pressure of the battery is greater than the set value, the internal air pressure pushes the movable pressing block assembly 4 to move upward, and the compression amount of the sealing ring 3 decreases without the squeezing of the movable pressing block assembly 4, thereby a gap that is not enough to seal the battery appears between the base 2 and the movable pressing block assembly 4, and the gas inside the battery passes through the gap between the base 2 and the movable pressing block assembly 4, and then discharges from the exhaust hole 501 to release the pressure. After the pressure is released, when the gas inside the battery is less than the set value, the movable pressing block assembly 4 rebounds, compresses the sealing ring 3 and seals the battery again. When the internal air pressure of the battery is less than the set value, the movable pressing block assembly always abuts against the sealing ring 3, the compression amount of the sealing ring 3 remains unchanged, there is no gap between the base 2 and the movable pressing block assembly 4, and the battery is in a sealed state. The utility model can automatically discharge gas when the internal gas pressure of the power battery is too high, and automatically seal the exhaust hole 501 after exhaust, thereby avoiding unnecessary scrapping of the battery and increasing the service life of the battery.

[0040] Please refer to Figure 2 and Figure 3The movable pressing block assembly 4 includes a pressing block 401 and a compression spring 402. The compression spring 402 is arranged between the pressing block 401 and the upper cover 5, and one end of the pressing block 401 abuts against the sealing ring 3. The compression spring 402 is arranged between the pressing block 401 and the upper cover 5 to provide a reset force for the pressing block 401. When the internal pressure of the battery increases, the gas pressure will push the pressing block 401 to overcome the resistance of the compression spring 402, so that the contact between the pressing block 401 and the sealing ring 3 is broken, thereby creating a gap between the base 2 and the pressing block 401, allowing the gas to pass through the gap to reach the exhaust hole 501 and discharge to the outside world. This process realizes the automatic exhaust function, effectively reduces the internal pressure of the battery, and protects the safety of the battery. When the pressure returns to normal, the compression spring 402 restores its deformation, pushes the pressing block 401 to reset, re-contacts with the sealing ring 3, and restores the sealing state. This automatic reset function ensures the reliability and durability of the exhaust structure. The arrangement of the compression spring 402 provides a stable resetting force for the pressing block 401, so that the pressing block 401 can be quickly and accurately reset to a position in close contact with the sealing ring 3 after being pushed by pressure, thereby improving the sealing effect of the sealing ring 3 and reducing the risk of gas leakage caused by the displacement or loosening of the pressing block 401. Through the synergistic effect of the pressing block 401, the compression spring 402 and the upper cover 5, a stable mechanical structure is formed, which can maintain a stable operating state when the internal pressure of the battery changes, and prevent structural damage or failure caused by pressure fluctuations.

[0041] Please refer to Figure 4 , the first annular boss 202 is provided with a first annular groove 2021, and the sealing ring 3 is provided in the first annular groove 2021. The first annular groove 2021 is provided on the first annular boss 202, and the sealing ring 3 is installed in the first annular groove 2021, which improves the stability and sealing effect of the sealing ring 3. The first annular groove 2021 provides a clear installation position and fixing method for the sealing ring 3, prevents the sealing ring 3 from shifting or falling off during use, thereby ensuring the reliability and durability of the seal. The sealing ring 3 is directly installed in the first annular groove 2021, which simplifies the installation process and reduces the difficulty and cost of installation. The user does not need to use additional tools or materials to fix the sealing ring 3, and only needs to place it in the first annular groove 2021 to complete the installation.

[0042] Please refer to Figure 2, the top cover sheet 1 is provided with a second annular groove 102, and the base 2 extends a second annular boss 203 adapted to the second annular groove 102 from the outer peripheral side of the top cover sheet 1. The second annular groove 102 is provided on the top cover sheet 1, and the second annular boss 203 adapted to the second annular groove 102 is extended from the outer peripheral side of the base 2, which increases the connection strength and sealing between the top cover sheet 1 and the base 2. The cooperation of the second annular groove 102 and the second annular boss 203 makes the connection between the top cover sheet 1 and the base 2 tighter and more stable, prevents loosening or separation due to external force, and also provides additional support and sealing effect for the sealing ring 3.

[0043] Please refer to Figure 4 and Figure 5 , a first thread 204 is provided on the side of the base 2 away from the second annular boss 203, a second thread 502 is provided on the inner circumference of the upper cover 5, and the base 2 and the upper cover 5 are connected through the first thread 204 and the second thread 502. The first thread 204 and the second thread 502 clarify the connection method between the base 2 and the upper cover 5, that is, the threaded connection through the first thread 204 and the second thread 502. This connection method is not only stable and reliable, ensuring a tight fit between the base and the upper cover to prevent loosening and leakage, but also easy to install and disassemble. During the installation process, it is only necessary to align the threaded portion of the upper cover 5 with the threaded portion of the base 2 and rotate the upper cover 5 to complete the installation. Similarly, when disassembly is required, it is only necessary to rotate the upper cover 5 in the opposite direction to easily separate it. This design not only improves the efficiency of installation and disassembly, but also reduces the difficulty of operation.

[0044] Furthermore, the upper cover 5 is provided with anti-skid convex patterns 503, which are evenly spaced on the outer peripheral side of the upper cover 5. The anti-skid convex patterns 503 are provided on the upper cover 5 to increase the friction during rotation, making the operation more stable and reliable. The design of the anti-skid convex patterns 503 takes into account the user's experience and avoids accidents caused by hand slipping when rotating the upper cover 5.

[0045] Specifically, the anti-skid convex pattern 503 extends along the axial direction of the upper cover 5. The anti-skid convex pattern 503 extends along the axial direction of the upper cover 5, so that the user can provide a more uniform force distribution and a better rotation feel when rotating the upper cover 5. At the same time, it also increases the stability during the rotation process and prevents the upper cover 5 from deflecting or shaking during the rotation process.

[0046] At the same time, a hexagonal boss 6 is provided on the end face of the upper cover 5 away from the base 2. The hexagonal boss 6 is provided on the end face of the upper cover 5 away from the base 2, which is convenient for users to use tools such as wrenches to tighten or disassemble. The design of the hexagonal boss 6 takes into account the convenience of users in actual operation, making the tightening or disassembly process simpler and faster.

[0047] In this embodiment, a plastic part 7 is connected to the side of the top cover sheet 1 away from the base 2. The plastic part 7 is connected to the side of the top cover sheet 1 away from the base 2 to increase insulation, protect the top cover sheet 1 from external impact or provide additional sealing effect, etc. The overall performance and safety of the battery top cover are improved to meet the needs of different usage scenarios.

[0048] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. An automatic exhaust structure for a power battery top cover, characterized in that: It includes a top cover sheet, a base, a sealing ring, a movable pressure block assembly and an upper cover, the top cover sheet and the base are respectively provided with a first through hole and a second through hole extending along their axial direction, the base is arranged at the upper end of the top cover sheet, and the second through hole is opposite to the first through hole, the upper cover is threadedly connected to the outer periphery of the base, the side wall of the second through hole is provided with a first annular boss, one end of the movable pressure block assembly abuts against the first annular boss, and the other end abuts against the upper cover, the sealing ring is arranged between the first annular boss and the movable pressure block assembly to seal the second through hole, and at least one exhaust hole is provided on the peripheral side of the upper cover.

2. The automatic exhaust structure of the power battery top cover according to claim 1 is characterized in that: The movable pressing block assembly comprises a pressing block and a compression spring. The compression spring is arranged between the pressing block and the upper cover. One end of the pressing block abuts against the sealing ring.

3. The automatic exhaust structure of the power battery top cover according to claim 1 is characterized in that: The first annular boss is provided with a first annular groove, and the sealing ring is arranged in the first annular groove.

4. The automatic exhaust structure of the power battery top cover according to claim 1, characterized in that: The top cover sheet is provided with a second annular groove, and a second annular boss matched with the second annular groove is extended from the outer peripheral side of the base close to the top cover sheet.

5. The automatic exhaust structure of the power battery top cover according to claim 4 is characterized in that: A first thread is disposed on a side of the base away from the second annular boss, a second thread is disposed on an inner circumference of the upper cover, and the base is connected to the upper cover via the first thread and the second thread.

6. The power battery top cover automatic exhaust structure according to claim 1, characterized in that: The upper cover is provided with anti-skid convex patterns, and the anti-skid convex patterns are evenly spaced on the outer peripheral side of the upper cover.

7. The power battery top cover automatic exhaust structure according to claim 6, characterized in that: The anti-slip convex pattern extends along the axial direction of the upper cover.

8. The power battery top cover automatic exhaust structure according to claim 1, characterized in that: A hexagonal boss is provided on one end surface of the upper cover away from the base.

9. The power battery top cover automatic exhaust structure according to claim 1, characterized in that: A plastic piece is connected to one side of the top cover sheet away from the base.

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