A battery top cover assembly and a power battery

Abstract

The utility model provides a kind of battery top cover assembly and power battery, belong to battery technical field.The top cover assembly includes top cover sheet and sealing element, and the middle part of top cover sheet is provided with the fixed hole for installing sealing ring, and sealing element is arranged in mounting hole, and the middle part of sealing ring is provided with pole post via hole.Sealing element and fixed hole between it are provided with several ring buckle structures, and sealing element and top cover sheet are mutually fixed by ring buckle structure.The assembly can avoid sealing element and top cover sheet shrink after injection molding, and can effectively prevent sealing element from rotating relative to top cover sheet, so as to improve the sealing property of sealing element to power battery.

Description

Technical Field

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

[0002] With the increasing global awareness of energy conservation and emission reduction and the rapid development of the new energy vehicle industry, the market demand for power batteries, as a core component of new energy vehicles, is experiencing explosive growth. The safety and production efficiency of power batteries directly affect the performance of new energy vehicles and the development of the industry. As a key component for cell packaging, the structural design of the power battery cover plays a decisive role in the sealing performance, explosion-proof reliability, and production convenience of the cells.

[0003] In existing power battery cover assemblies, the top cover plate and sealing ring are joined by injection molding. The contact surface between the top cover plate and the sealing ring is relatively smooth, which can lead to dimensional instability and shrinkage of the sealing ring during injection molding. Furthermore, the sealing ring is prone to rotation relative to the top cover plate during assembly or use. This problem directly reduces the fitting precision between the sealing ring and the top cover plate. At best, it affects the sealing performance of the battery cell, causing electrolyte leakage risks; at worst, it can lead to short circuits, bulging, and other safety hazards due to seal failure, severely restricting the production qualification rate and service life of the battery cells.

[0004] Therefore, it is necessary to improve the top cover structure of existing power batteries to overcome the shortcomings of existing technology. Summary of the Invention

[0005] To overcome the problems existing in the related technologies, one of the objectives of this utility model is to provide a battery top cover assembly that can prevent the seal and top cover sheet from shrinking after injection molding and can effectively prevent the seal from rotating relative to the top cover sheet, thereby improving the sealing performance of the seal for the power battery.

[0006] A battery top cover assembly includes: a top cover sheet and a sealing element, wherein the top cover sheet has a fixing hole in the middle for installing a sealing ring, the sealing element is disposed in the fixing hole, and the sealing ring has a terminal post through hole in the middle; A plurality of ring-shaped structures are provided between the sealing element and the fixing hole, and the sealing element and the top cover plate are fixed to each other by the ring-shaped structures.

[0007] The sealing element is a sealing ring made of electrolyte-resistant rubber, integrally molded into the fixing hole of the top cover plate using an injection molding process. The sealing ring has a terminal through-hole in the center for the power battery terminal to pass through; the inner wall of the through-hole fits tightly against the side wall of the terminal to achieve a seal. The outer wall of the sealing ring has four arc-shaped grooves (the other part of the ring-locking structure) corresponding to the annular protrusion of the top cover plate along its circumference. The depth of the grooves matches the height of the protrusion, and after assembly, the protrusion and the grooves fully engage. The sealing ring is embedded into the fixing hole of the top cover plate through injection molding. At this point, the annular protrusion of the top cover plate and the arc-shaped grooves of the sealing ring form a ring-locking structure, achieving circumferential fixation. After the terminal passes through the terminal through-hole of the sealing ring, it fits tightly against the inner wall of the sealing ring, ensuring a sealed environment inside the power battery. This top cover assembly is installed on top of the power battery casing and fixed to the casing through positioning holes on the edge of the top cover plate.

[0008] The ring-lock structure provides circumferential constraint to the sealing ring, which can effectively counteract the inward shrinkage tendency of the sealing ring caused by material shrinkage characteristics (such as cooling shrinkage after injection molding) or external forces (such as battery vibration), ensuring the fitting accuracy between the sealing ring and the fixing hole, avoiding the appearance of sealing gaps, and thus reducing the risk of electrolyte leakage.

[0009] In a preferred embodiment of this invention, the ring buckle structure includes a flow-stopping groove disposed on the top cover plate and a first buckle disposed on the sealing element. The flow-stopping groove is evenly distributed along the circumference of the fixing hole at the edge of the fixing hole. The first buckle is adapted to the flow-stopping groove.

[0010] In a preferred embodiment of this invention, the cross-section of the fixing hole is circular, the cross-section of the flow-stopping groove is arc-shaped, and the length direction of the flow-stopping groove is arranged along the circumference of the fixing hole.

[0011] Specifically, the sealing element is a sealing ring. The outer wall of the sealing ring corresponds to the position of the flow-stop groove of the top cover plate and is provided with 6 arc-shaped first buckles (i.e., another part of the ring buckle structure). The curvature, height and width of the buckles are perfectly matched with the flow-stop groove. After injection molding, the first buckles are precisely embedded in the flow-stop groove to form a tightly interlocking ring buckle structure.

[0012] In this embodiment, the segmented anti-flow grooves evenly distributed along the circumference of the fixing hole and the first buckle form a "circumferential locking" effect through multiple engagement points. Even if the power battery is subjected to external forces such as vibration or impact during assembly, transportation, or use, the sealing ring cannot rotate circumferentially relative to the top cover plate, ensuring that the sealing ring and the contact surfaces of the terminal post and fixing hole are always tight, maintaining long-term stable sealing performance.

[0013] In a preferred embodiment of this invention, the ring buckle structure includes a second buckle disposed on the top cover plate and a second groove disposed on the sealing member, wherein the second buckle is adapted to the second groove.

[0014] In this embodiment, the sealing ring is made of electrolyte-resistant rubber and is fixed to the fixing hole of the top cover plate by injection molding. The sealing ring has a through hole in the center for the electrode to pass through and fit tightly to achieve a seal. The outer wall of the sealing ring, corresponding to the second snap-fit ​​position of the top cover plate, has six arc-shaped second grooves. The curvature, depth, and width of the grooves are perfectly matched to the second snap-fit. After injection molding, the second snap-fit ​​fits precisely into the second groove, forming a tightly interlocking ring structure.

[0015] The matching design of the second snap and the second groove in this embodiment can form a uniform circumferential constraint on the sealing ring. After injection molding and cooling, the shrinkage force of the sealing ring material will be offset by the interlocking relationship between the snap and the groove, avoiding sealing gaps caused by dimensional shrinkage, ensuring the fitting accuracy between the sealing ring and the fixing hole, reducing the risk of electrolyte leakage, and also achieving the purpose of preventing the sealing ring from shrinking after injection molding.

[0016] In a preferred embodiment of this utility model, several flow-stopping grooves are evenly arranged along the circumference of the fixing hole at the edge of the fixing hole. Along the circumference of the fixing hole, several second buckles are evenly arranged at the edge of the fixing hole.

[0017] In a preferred embodiment of this invention, the top cover and the sealing element are integrally formed.

[0018] The sealing ring is integrally formed with the top cover through injection molding. The ring structure can be formed directly during the injection molding process without additional fixing processes (such as bolt connection, gluing, etc.), which reduces production steps, improves assembly efficiency, and reduces the risk of seal failure caused by multi-process assembly.

[0019] In a preferred embodiment of this invention, the top cover plate is provided with a mounting hole for installing an explosion-proof valve, and the mounting hole is located at the geometric center of the top cover plate. Along the axial direction of the mounting hole, the edge of the mounting hole is stepped.

[0020] The stepped design at the edge of the mounting hole raises the installation and fixing position of the explosion-proof valve, ensuring that the scoring position of the explosion-proof valve does not protrude from the bottom plastic surface. This effectively prevents the scoring from being damaged by collisions or friction with other components during the transportation, assembly, and use of the power battery.

[0021] In addition, the stepped mounting holes provide dual positioning for the explosion-proof valve, ensuring that it will not shift radially during installation and guaranteeing its coaxiality with the mounting holes, thereby improving the sealing performance and operational reliability of the explosion-proof valve. Simultaneously, the design of the second step being slightly higher than the thickness of the explosion-proof valve facilitates positioning and operation during welding, enhancing the connection between the explosion-proof valve and the top cover plate.

[0022] In a preferred embodiment of this invention, the edge of the mounting hole is provided with a first step and a second step; Along the axial direction of the mounting hole, the first step is located below the second step, and an explosion-proof plate is provided on the explosion-proof valve. The height of the second step is greater than the thickness of the explosion-proof plate.

[0023] The second objective of this utility model is to provide a power battery, including the battery top cover assembly as described above.

[0024] The beneficial effects of this utility model are as follows: This utility model provides a battery top cover assembly, which includes a top cover sheet and a sealing element. The top cover sheet has a fixing hole in its center for installing a sealing ring, and the sealing element is disposed in the mounting hole. The sealing ring has a terminal through-hole in its center. Several ring-locking structures are provided between the sealing element and the fixing hole, and the sealing element and the top cover sheet are fixed together by these ring-locking structures. After injection molding, the ring-locking structures can form a circumferential constraint on the sealing element, effectively preventing the sealing element from shrinking due to material shrinkage or external forces, ensuring the fitting accuracy between the sealing element and the fixing hole, thereby improving the sealing performance of the power battery and reducing the risk of electrolyte leakage. In addition, the interlocking action of the ring-locking structures restricts the circumferential relative movement between the sealing element and the top cover sheet, preventing the sealing element from rotating relative to the top cover sheet due to vibration, impact, or other factors during power battery assembly, transportation, or use. This prevents gaps from appearing between the sealing element and the terminal / fixing hole, maintaining long-term stable sealing performance.

[0025] This application also provides a power battery including the above-mentioned battery top cover assembly, which improves the sealing performance of the power battery through the battery top cover assembly, thereby extending the service life of the power battery and enabling the battery to work stably for a long time. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the battery top cover assembly provided in an embodiment of this utility model; Figure 2 yes Figure 1 A magnified view of a portion at point C; Figure 3 This is a schematic diagram of the top cover sheet provided in an embodiment of this utility model; Figure 4 This is a schematic diagram showing the connection between the sealing element and the top cover plate provided in an embodiment of this utility model; Figure 5 This is a perspective view of the sealing element provided in an embodiment of this utility model; Figure 6 This is a top view of the sealing element provided in an embodiment of this utility model.

[0027] Figure 7 This is a side view of the sealing element provided in an embodiment of this utility model.

[0028] Figure label: 100. Terminal post; 200. Upper plastic; 300. Sealing ring; 301. Terminal post through hole; 302. First snap-fit; 400. Top cover plate; 405. First step; 406. Second step; 500. Lower plastic; 600. Adapter plate; 700. Explosion-proof valve protective patch; 800. Explosion-proof valve; 801. Explosion-proof valve serration position. Detailed Implementation

[0029] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0030] In existing power battery cover assemblies, the top cover plate and sealing ring are joined by injection molding. The contact surface between the top cover plate and the sealing ring is relatively smooth, which can lead to dimensional instability and shrinkage of the sealing ring during injection molding. Furthermore, the sealing ring is prone to rotation relative to the top cover plate during assembly or use. This problem directly reduces the fitting precision between the sealing ring and the top cover plate. At best, it affects the sealing performance of the battery cell, causing electrolyte leakage risks; at worst, it can lead to short circuits, bulging, and other safety hazards due to seal failure, severely restricting the production qualification rate and service life of the battery cells.

[0031] Based on this, this application provides a battery top cover assembly.

[0032] Example 1 like Figures 1-7 As shown, this embodiment provides a battery top cover assembly, including: a top cover sheet and a sealing member. The top cover sheet has a fixing hole in the middle for installing a sealing ring, the sealing member is disposed in the fixing hole, and the sealing ring has a terminal post through hole in the middle. A plurality of ring-shaped structures are provided between the sealing element and the fixing hole, and the sealing element and the top cover plate are fixed to each other by the ring-shaped structures.

[0033] Specifically, the top cover is a sheet-like structure made of metal, with a fixing hole in the center for installing a sealing ring. The inner wall of the fixing hole has four annular protrusions (part of the ring-lock structure) spaced circumferentially, with a protrusion height of 0.5mm, forming an arc-shaped groove between adjacent protrusions. The edge of the top cover also has positioning holes for assembly and positioning with the power battery casing.

[0034] The sealing element is a sealing ring made of electrolyte-resistant rubber, integrally molded into the fixing hole of the top cover plate using an injection molding process. The sealing ring has a terminal through-hole in the center for the power battery terminal to pass through; the inner wall of the through-hole fits tightly against the side wall of the terminal to achieve a seal. The outer wall of the sealing ring has four arc-shaped grooves (the other part of the ring-locking structure) corresponding to the annular protrusion of the top cover plate along its circumference. The depth of the grooves matches the height of the protrusion, and after assembly, the protrusion and the grooves fully engage. The sealing ring is embedded into the fixing hole of the top cover plate through injection molding. At this point, the annular protrusion of the top cover plate and the arc-shaped grooves of the sealing ring form a ring-locking structure, achieving circumferential fixation. After the terminal passes through the terminal through-hole of the sealing ring, it fits tightly against the inner wall of the sealing ring, ensuring a sealed environment inside the power battery. This top cover assembly is installed on top of the power battery casing and fixed to the casing through positioning holes on the edge of the top cover plate.

[0035] The ring-lock structure provides circumferential constraint to the sealing ring, which can effectively counteract the inward shrinkage tendency of the sealing ring caused by material shrinkage characteristics (such as cooling shrinkage after injection molding) or external forces (such as battery vibration), ensuring the fitting accuracy between the sealing ring and the fixing hole, avoiding the appearance of sealing gaps, and thus reducing the risk of electrolyte leakage.

[0036] Example 2 This embodiment is an improvement on embodiment 1.

[0037] In this embodiment, the ring buckle structure includes a flow-stopping groove disposed on the top cover plate and a first buckle disposed on the sealing member. The flow-stopping groove is evenly distributed along the circumference of the fixing hole at the edge of the fixing hole; the first buckle is adapted to the flow-stopping groove.

[0038] In this embodiment, the cross-section of the fixing hole is circular, the cross-section of the flow-stopping groove is arc-shaped, and the length direction of the flow-stopping groove is arranged along the circumference of the fixing hole.

[0039] Specifically, the sealing element is a sealing ring. The outer wall of the sealing ring corresponds to the position of the flow-stop groove of the top cover plate and is provided with 6 arc-shaped first buckles (i.e., another part of the ring buckle structure). The curvature, height and width of the buckles are perfectly matched with the flow-stop groove. After injection molding, the first buckles are precisely embedded in the flow-stop groove to form a tightly interlocking ring buckle structure.

[0040] In this embodiment, the segmented anti-flow grooves evenly distributed along the circumference of the fixing hole and the first buckle form a "circumferential locking" effect through multiple engagement points. Even if the power battery is subjected to external forces such as vibration or impact during assembly, transportation, or use, the sealing ring cannot rotate circumferentially relative to the top cover plate, ensuring that the sealing ring and the contact surfaces of the terminal post and fixing hole are always tight, maintaining long-term stable sealing performance.

[0041] Furthermore, along the circumference of the fixing hole, several flow-stopping grooves are evenly arranged at the edge of the fixing hole; Along the circumference of the fixing hole, several second buckles are evenly arranged at the edge of the fixing hole.

[0042] In practical applications, the cross-section of the flow-stopping groove is arc-shaped, with its length direction aligned with the circumference of the fixing hole. The arc length of a single flow-stopping groove is 30°, its depth is 0.8 mm, and its width is 1.2 mm. A 10° interval is maintained between adjacent flow-stopping grooves, forming a segmented structure. This ensures uniform constraint on the sealing element while avoiding excessive weakening of the top cover structure strength by the overall annular groove.

[0043] Furthermore, in this embodiment, the top cover sheet and the sealing element are integrally formed.

[0044] The sealing ring is integrally formed with the top cover through injection molding. The ring structure can be formed directly during the injection molding process without additional fixing processes (such as bolt connection, gluing, etc.), which reduces production steps, improves assembly efficiency, and reduces the risk of seal failure caused by multi-process assembly.

[0045] Example 3 This embodiment is an improvement on embodiment 1.

[0046] Unlike Embodiment 2, in this embodiment, the ring buckle structure includes a second buckle disposed on the top cover plate and a second groove disposed on the sealing member, wherein the second buckle is adapted to the second groove.

[0047] In this embodiment, the fixing hole (for installing the sealing ring) in the middle of the top cover plate is circular, and six second buckles are evenly distributed along the circumferential edge of the fixing hole. The second buckle is an arc-shaped protrusion protruding from the inner wall of the fixing hole. The arc length of a single protrusion is 30°, the height is 0.6mm, and the width is 1.0mm. A 10° interval is maintained between adjacent buckles to form a segmented structure, which ensures the constraint effect on the sealing ring while avoiding weakening the overall structural strength of the top cover plate.

[0048] The sealing ring is made of electrolyte-resistant rubber and is fixed to the fixing hole in the top cover plate through injection molding. The sealing ring has a through hole in the center for the electrode to pass through and fit tightly to achieve a seal. The outer wall of the sealing ring has six arc-shaped second grooves corresponding to the second snap-fit ​​position of the top cover plate. The curvature, depth, and width of the grooves perfectly match the second snap-fit. After injection molding, the second snap-fit ​​fits precisely into the second groove, forming a tightly interlocking ring structure.

[0049] The matching design of the second buckle and the second groove in this embodiment provides a double constraint on the sealing ring: on the one hand, the radial contact surface of the buckle offsets the shrinkage force of the material after the sealing ring is injected and cooled, preventing it from creating a gap with the fixing hole due to inward shrinkage; on the other hand, the circumferentially distributed segmented buckles prevent the sealing ring from rotating relative to the top cover plate through mechanical limiting, ensuring long-term contact of the sealing surface.

[0050] Moreover, the circumferentially distributed segmented buckles and grooves form a "multi-point locking" mechanism. Even if the power battery is subjected to external forces such as vibration or impact during assembly, transportation, or use, the sealing ring cannot rotate circumferentially relative to the top cover plate, ensuring that it always fits tightly with the sealing surfaces of the poles and fixing holes, maintaining long-term stable sealing performance.

[0051] Example 4 In this embodiment, the top cover plate is provided with a mounting hole for installing an explosion-proof valve, and the mounting hole is located at the geometric center of the top cover plate; Along the axial direction of the mounting hole, the edge of the mounting hole is stepped.

[0052] The stepped design at the edge of the mounting hole raises the installation and fixing position of the explosion-proof valve, ensuring that the scoring position of the explosion-proof valve does not protrude from the bottom plastic surface. This effectively prevents the scoring from being damaged by collisions or friction with other components during the transportation, assembly, and use of the power battery.

[0053] In addition, the stepped mounting holes provide dual positioning for the explosion-proof valve, ensuring that it will not shift radially during installation and guaranteeing its coaxiality with the mounting holes, thereby improving the sealing performance and operational reliability of the explosion-proof valve. Simultaneously, the design of the second step being slightly higher than the thickness of the explosion-proof valve facilitates positioning and operation during welding, enhancing the connection between the explosion-proof valve and the top cover plate.

[0054] Furthermore, in this embodiment, the edge of the mounting hole is provided with a first step and a second step; Along the axial direction of the mounting hole, the first step is located below the second step, and an explosion-proof plate is provided on the explosion-proof valve. The height of the second step is greater than the thickness of the explosion-proof plate.

[0055] Specifically, the first step is located below the second step, that is, on the side closer to the lower plastic, and is a ring structure. The radial width and axial height are set to ensure stable elevation of the explosion-proof valve installation position. The second step is located above the first step, concentric with the first step, and is also a ring structure. Its height is greater than the thickness of the explosion-proof plate on the explosion-proof valve.

[0056] The edge of the explosion-proof disc of the explosion-proof valve fits into the end face of the second step and is fixed to the second step by welding. Because the height of the second step is greater than the thickness of the explosion-proof disc, a suitable operating space is created during welding, ensuring the weld's strength. Simultaneously, the presence of the first step raises the overall installation position of the explosion-proof disc, ensuring that the grooves on the explosion-proof valve are located inside the lower plastic base and do not protrude outwards.

[0057] In the entire cover plate assembly, the lower plastic wraps around the edge of the top cover plate, and its bottom surface is flush with the plane formed by the first step. The explosion-proof valve protection patch covers the outside of the explosion-proof valve and is adapted to the space formed by the first step to prevent the explosion-proof valve from being directly impacted by external forces, and does not affect the normal use of other functional structures such as the injection hole.

[0058] In this embodiment, the etched area of ​​the explosion-proof valve does not protrude from the bottom plastic surface due to the raised effect of the first step, effectively avoiding damage caused by collision or friction during transportation, assembly and use.

[0059] The design of the second step being higher than the thickness of the explosion-proof sheet provides ample operating space for welding, ensuring the firmness of the weld between the explosion-proof sheet and the top cover sheet, avoiding sealing failure due to poor welding, and improving the stability and reliability of the explosion-proof valve installation.

[0060] In a more specific implementation, the height difference between the second step and the thickness of the explosion-proof sheet should not be too large. For example, for explosion-proof valves of conventional thickness (0.3-0.5mm), the difference between the height of the second step and the thickness of the explosion-proof sheet is usually required to be ≤0.1, that is, the height difference between the two is ≤0.1; for thinner explosion-proof valves (0.1-0.3mm), the height difference is ≤0.05.

[0061] Example 5 This embodiment provides a power battery, including the battery top cover assembly as described above.

[0062] Specifically, in addition to the battery top cover assembly described in any of the above embodiments, the power battery also includes core components such as the casing, battery cells, terminals, and electrolyte. The battery top cover assembly serves as the top sealing structure of the power battery, and together with the casing, it forms a closed space in which the battery cells, electrolyte, and other components are housed.

[0063] The battery casing is a hollow structure with one open end. The cells are stacked or wound and placed inside the casing. Electrolyte is injected into the casing to wet the cells. One end of the terminal post is electrically connected to the electrode lead of the cell, and the other end passes through the terminal post through hole of the sealing ring in the battery top cover assembly. It forms a seal with the sealing ring through an interference fit. The edge of the top cover plate of the battery top cover assembly is fixed to the open end of the casing by welding or laser sealing process to form the overall sealed structure of the power battery.

[0064] The specific structural features of the battery top cover assembly include: a fixing hole for installing a sealing ring on the top cover sheet; the sealing ring and the fixing hole are fixed by a ring-shaped fastening structure (such as a ring-shaped segmented flow stop groove and a ring-shaped segmented snap fastener, or a second snap fastener and a second groove) to prevent the sealing ring from shrinking inward or rotating relative to the top cover sheet; a mounting hole is provided at the geometric center of the top cover sheet; a first step and a second step are provided at the edge of the mounting hole; the explosion-proof valve's explosion-proof sheet is installed on the second step, and the height of the second step is greater than the thickness of the explosion-proof sheet, so that the scoring position of the explosion-proof valve does not protrude from the lower plastic bottom surface.

[0065] The sealing ring of the battery top cover assembly is tightly fixed to the top cover plate through a ring-lock structure, ensuring the sealing performance between the terminal and the top cover plate and preventing electrolyte leakage from the gap between the terminal and the sealing ring. The explosion-proof valve is stably installed through a stepped structure, and its serrated position is effectively protected because it does not protrude from the bottom plastic surface. When the internal pressure of the power battery rises abnormally, the serrated position can precisely rupture to release the pressure and avoid dangers such as battery explosion.

[0066] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0067] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0068] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A battery top cover assembly comprising: A top cover plate and a sealing element, wherein the top cover plate has a fixing hole in the middle for installing a sealing ring, the sealing element is disposed in the fixing hole, and the sealing ring has a through hole for a pole post in the middle, characterized in that: A plurality of ring-shaped structures are provided between the sealing element and the fixing hole, and the sealing element and the top cover plate are fixed to each other by the ring-shaped structures.

2. The battery top cover assembly according to claim 1, characterized in that: The ring-shaped structure includes a flow-stopping groove disposed on the top cover plate and a first buckle disposed on the sealing element. The flow-stopping groove is evenly distributed along the circumference of the fixing hole at the edge of the fixing hole. The first buckle is adapted to the flow-stopping groove.

3. The battery top cover assembly according to claim 2, characterized in that: The cross-section of the fixing hole is circular, the cross-section of the flow-stopping groove is arc-shaped, and the length direction of the flow-stopping groove is along the circumference of the fixing hole.

4. The battery top cover assembly according to claim 2, characterized in that: The ring-shaped structure includes a second buckle disposed on the top cover plate and a second groove disposed on the sealing element, wherein the second buckle is adapted to the second groove.

5. The battery top cover assembly according to claim 4, characterized in that: Along the circumference of the fixing hole, several flow-stopping grooves are evenly arranged at the edge of the fixing hole; Along the circumference of the fixing hole, several second buckles are evenly arranged at the edge of the fixing hole.

6. The battery top cover assembly according to any one of claims 1-4, characterized in that: The top cover plate and the sealing element are integrally formed.

7. The battery top cover assembly according to claim 1, characterized in that: The top cover plate is provided with a mounting hole for installing an explosion-proof valve, and the mounting hole is located at the geometric center of the top cover plate; Along the axial direction of the mounting hole, the edge of the mounting hole is stepped.

8. The battery top cover assembly according to claim 7, characterized in that: The edge of the mounting hole is provided with a first step and a second step; Along the axial direction of the mounting hole, the first step is located below the second step, and an explosion-proof plate is provided on the explosion-proof valve. The height of the second step is greater than the thickness of the explosion-proof plate.

9. A power cell, characterized by: Includes the battery top cover assembly as described in any one of claims 1-8.

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