A cover plate structure and an energy storage battery with the same

Abstract

The application provides a cover plate structure and an energy storage battery with the same. The cover plate structure comprises a top cover sheet, a pole, a sealing ring, an upper plastic part and a lower plastic part. The pole comprises a bevel section and a straight section which are coaxially connected. The upper part of the bevel section has a larger diameter than the lower part, so that the outer side of the bevel section forms a circular table. The lower part of the bevel section has the same diameter as the straight section and is smoothly connected to the straight section. The sealing ring is axially pressed at the bottom of the pole and is sleeved on the outer circumferential side of the straight section. The bevel section of the pole axially limits the sealing ring, effectively prevents the sealing ring from being upwardly buckled when the sealing ring is subjected to external force during injection molding or assembly, ensures that the sealing ring always maintains a close-fitting state with the pole and the top cover sheet, thereby stably maintaining the integrity of the sealing interface, avoiding the sealing failure caused by the displacement of the sealing ring, and significantly improving the sealing reliability of the cover plate structure.

Description

Technical Field

[0001] This utility model relates to the field of energy storage battery technology, specifically to a cover plate structure and an energy storage battery with the structure. Background Technology

[0002] In the field of energy storage battery technology, the battery top cover is a key component for battery sealing and terminal lead-out. Its structural design and assembly process directly affect the battery's sealing performance, electrical reliability and overall quality.

[0003] In existing technologies, battery top covers typically consist of a top cover sheet, a positive terminal, a negative terminal, upper plastic for the positive terminal, upper plastic for the negative terminal, a sealing ring, and a lower plastic component. These components work together to achieve the functions of terminal fixation, electrical isolation, and sealing. Specifically, the top cover sheet has two pre-drilled terminal mounting holes that mate with the positive and negative terminals. During assembly, the sealing rings are first fitted onto the positive and negative terminals, and then they are placed into the corresponding terminal mounting holes on the top cover sheet. Subsequently, the upper plastic for the positive and negative terminals is molded into the gaps between the positive and negative terminals and the top cover sheet using an injection molding process. On the one hand, the upper plastic fills the gaps to achieve electrical isolation between the terminals and the top cover sheet; on the other hand, the pressure during the injection molding process compresses the sealing ring, causing it to fit tightly against the mating surfaces of the terminals and the top cover sheet, thereby forming a sealed structure.

[0004] However, existing battery top cover assembly processes and structural designs have the following defects: During injection molding of the plastic or assembly of the terminals, the injection pressure or assembly operation can easily disturb or compress the sealing ring fitted on the terminals. Because the existing terminal structure does not effectively limit the sealing ring, it is prone to upward displacement under the aforementioned external forces. This prevents the sealing ring from maintaining a tight and uniform fit with the terminals and top cover, thus disrupting the sealing relationship between the terminals and the top cover, resulting in a significant decrease in the sealing performance of the battery top cover. Poor sealing performance can not only lead to electrolyte leakage inside the battery but also allow moisture, dust, and other impurities from the external environment to enter the battery. This can affect the stability of the battery's electrochemical performance and lifespan, and may even cause internal short circuits and other safety hazards, seriously impacting the product quality and safety of energy storage batteries.

[0005] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content

[0006] The purpose of this invention is to provide a cover plate structure and an energy storage battery with the same structure to prevent the sealing ring from lifting up during assembly.

[0007] To achieve the above objectives, the present invention adopts a cover plate structure, comprising:

[0008] Top cover plate, wherein the top cover plate is provided with pole mounting holes;

[0009] The electrode post is disposed within the electrode post mounting hole;

[0010] A sealing ring is fitted over the electrode post and seals the gap between the electrode post and the top cover plate;

[0011] The upper plastic part is injection molded between the electrode post, the electrode post mounting hole, and the sealing ring;

[0012] The lower plastic part is attached to the lower surface of the top cover sheet;

[0013] The pole includes a beveled section and a straight section coaxially connected. The upper diameter of the beveled section is larger than the lower diameter, so that its outer surface forms a frustum. The lower part of the beveled section has the same diameter as the straight section and is smoothly connected.

[0014] The sealing ring is pressed axially against the bottom of the pole post and sleeved on the outer periphery of the straight section.

[0015] In the above solution, the inclined section of the pole forms an axial limit on the sealing ring, preventing the sealing ring from tilting upwards during injection molding or assembly, thus ensuring sealing performance.

[0016] A further technical solution involves providing raised and recessed textures on the outer surface of the inclined section. After injection molding, the upper plastic part is tightly bonded to the outer surface of the inclined section and fills the raised and recessed textures. The raised and recessed textures increase the contact area and friction between the upper plastic part and the inclined section of the electrode post, improving the bonding strength between the upper plastic part and the electrode post, thereby increasing the pushing force of the electrode post and preventing the electrode post from detaching from the cover plate structure.

[0017] A further technical solution is that the raised and recessed texture is a grid pattern, and the texture depth is 0.1mm-0.3mm. The grid pattern allows the upper plastic part and the inclined section of the pole to form a uniform interlocking structure, avoiding local stress concentration. At the same time, the texture depth setting can prevent the pole from losing structural strength due to knurling while ensuring the bonding strength.

[0018] A further technical solution involves providing an annular groove on the outer surface of the inclined section. After injection molding, the upper plastic part is tightly bonded to the outer surface of the inclined section and fills the annular groove. Alternatively, the annular groove also enables the upper plastic part and the inclined section of the pole post to form an interlocking structure, improving the bonding strength.

[0019] A further technical solution is that the outer surface of the inclined section has an axial tilt angle of 5°-35°. This tilt angle can provide stable axial positioning for the sealing ring, preventing it from warping, and also avoids difficulties in installing the sealing ring due to an excessively large tilt angle, or incomplete filling during injection molding of the plastic parts.

[0020] A further technical solution involves an annular protrusion structure on the upper surface of the top cover plate surrounding the electrode mounting hole. This annular protrusion structure extends away from the lower plastic part, and its inner wall engages with the outer surface of the inclined section to clamp the upper plastic part. The engagement between the inclined section and the inner surface of the stepped structure provides bidirectional restraint for the upper plastic part. Because the inclined surface slopes downwards, it prevents the upper plastic part from detaching from between the electrode and the top cover plate.

[0021] A further technical solution involves forming at least two stepped surfaces on the radially outer side of the annular protrusion structure, with the stepped surface on the radially inner side being higher than that on the radially outer side. The upper plastic part covers each of the stepped surfaces of the annular protrusion structure. The stepped surfaces of different depths can form a stepped fit with the upper plastic part, extending the force path of the upper plastic part, further enhancing the connection stability between the upper plastic part and the top cover sheet, and improving the upper plastic part's resistance to detachment.

[0022] A further technical solution is that each of the stepped surfaces has notches distributed along the circumferential direction, and the notches of adjacent stepped surfaces are staggered in the circumferential direction. The staggered notches can restrict the relative rotation between the upper plastic part, the pole, and the top cover plate, and prevent the relative rotation of the three from damaging the seal or electrical connection due to vibration or external force.

[0023] A further technical solution is that the lower surface of the top cover plate, around the position of the pole mounting hole, is provided with a limiting recess, which is used to compress and limit the sealing ring during assembly.

[0024] According to a second aspect of this application, an energy storage battery is also provided, including a housing, at least one battery cell housed within the housing, and a cover structure as described in the first aspect, the cover structure covering an opening end of the housing and sealing the housing.

[0025] In the above solution, the high sealing performance of the cover structure prevents electrolyte leakage and external impurities from entering the casing, thereby improving the overall reliability, electrical safety and service life of the energy storage battery.

[0026] The technical solution provided in this application has the following beneficial effects:

[0027] By designing the pole as a coaxially connected inclined section and straight section, with the upper diameter of the inclined section being larger than the lower diameter, its outer surface forms a frustum. The lower part of the inclined section has the same diameter as the straight section and is smoothly connected. The sealing ring is axially pressed against the bottom of the pole and fitted onto the outer circumference of the straight section. The inclined section of the pole axially limits the sealing ring, effectively preventing it from tilting upwards under external force during injection molding or assembly. This ensures that the sealing ring always maintains a tight fit with the pole and the top cover, thus stably maintaining the integrity of the sealing interface and avoiding sealing failure caused by sealing ring displacement, significantly improving the sealing reliability of the cover structure. Simultaneously, the smooth connection between the inclined and straight sections ensures the continuity and mechanical stability of the overall pole structure and provides a smooth filling path for the injection molding of the upper plastic part. This allows the upper plastic part to tightly wrap the pole surface, further enhancing the connection between the pole and the top cover, and overall improving the assembly efficiency and safety of the cover structure. Attached Figure Description

[0028] Appendix Figure 1 This is an exploded view of the cover plate structure provided in an embodiment of the present utility model;

[0029] Appendix Figure 2 This is a three-dimensional structural diagram of the pole column provided in an embodiment of the present utility model;

[0030] Appendix Figure 3 A cross-sectional view of the pole provided in an embodiment of this utility model;

[0031] Appendix Figure 4 A cross-sectional view showing the positional relationship between the pole post and the sealing ring provided in an embodiment of this utility model;

[0032] Appendix Figure 5 This is a structural diagram of the top cover sheet provided in an embodiment of the present utility model;

[0033] Appendix Figure 6 This is a schematic diagram of the annular protrusion structure provided in an embodiment of the present utility model;

[0034] Appendix Figure 7 This is a cross-sectional view of the cover plate structure provided in an embodiment of the present utility model;

[0035] Appendix Figure 8 for Figure 7 A magnified view of a portion of point A in the middle.

[0036] In the attached diagrams: 1-Top cover plate; 11-Pole mounting hole; 12-Annular protrusion structure; 121-First step surface; 121a-First step surface notch; 122-Second step surface; 122a-Second step surface notch; 13-Limiting recess; 14-Injection hole; 15-Explosion-proof valve; 2-Pole post; 21-Sloping section; 21a-Frustum; 21b-Rough texture; 22-Straight section; 23-Flange; 3-Sealing ring; 4-Upper plastic part; 5-Lower plastic part. Detailed Implementation

[0037] 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 a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0038] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0039] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0040] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0041] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0042] See appendix Figures 1-8 This application provides a cover plate structure, including a top cover plate 1, an pole post 2, a sealing ring 3, an upper plastic part 4, and a lower plastic part 5.

[0043] like Figure 1As shown, the top cover plate 1 has terminal mounting holes 11. In this embodiment, the top cover plate 1 has two terminal mounting holes 11, namely a positive terminal mounting hole 11 and a negative terminal mounting hole 11, to accommodate the positive and negative terminal lead-out requirements of the battery. In possible embodiments, depending on the number of battery terminals 2, the top cover plate 1 may also have more terminal mounting holes 11. In addition, the top cover plate 1 is also provided with an electrolyte injection hole 14 and an explosion-proof valve 15. The electrolyte injection hole 14 is used to inject electrolyte during battery assembly, and the explosion-proof valve 15 opens when the internal pressure of the battery abnormally increases, playing a role in safe pressure relief and preventing the battery from becoming dangerous.

[0044] The electrode post 2 is installed inside the electrode post mounting hole 11, as shown in the attached figure. Figure 2 As shown, the pole post 2 includes a sloped section 21 and a straight section 22 coaxially connected. The upper diameter of the sloped section 21 is larger than the lower diameter, so that its outer surface forms a frustum 21a. It should be noted that the frustum 21a in this application includes both a standard frustum and a slightly concave or convex frustum, etc.

[0045] The lower part of the inclined section 21 has the same diameter as the straight section 22 and is smoothly connected. This smooth transition design reduces stress concentration on the surface of the pole post 2, enhances the overall structural strength, and allows the sealing ring 3 to be smoothly pressed onto the straight section 22. A flange 23 is formed at the bottom of the pole post 2, which extends radially outward to provide a stable axial support surface for the sealing ring 3.

[0046] The sealing ring 3 is fitted over the pole post 2 and seals the gap between the pole post 2 and the top cover plate 1; specifically, the sealing ring 3 is axially pressed onto the flange 23 at the bottom of the pole post 2 and tightly fitted onto the outer periphery of the straight section 22, such as... Figure 4 As shown. During assembly, since the upper diameter of the inclined section 21 is slightly larger than the inner diameter of the sealing ring 3 in the sleeved state, the sealing ring 3 needs to be opened appropriately so that it passes over the upper part of the inclined section 21 and finally falls on the flange 23 and forms an interference fit with the straight section 22 to ensure the reliability of the initial sealing state.

[0047] The upper plastic part 4 is injection molded between the pole post 2, the pole post mounting hole 11 and the sealing ring 3. Through the injection molding process, it is tightly combined with the pole post 2 and the top cover plate 1, which not only achieves electrical isolation between the pole post 2 and the top cover plate 1, but also fixes the position of the pole post 2.

[0048] The lower plastic part 5 is attached to the lower surface of the top cover plate 1. To enhance the connection stability, the lower plastic part 5 can be connected to the top cover plate 1 by ultrasonic welding. The heat generated by high frequency vibration melts and bonds the lower plastic part 5 to the lower surface of the top cover plate 1, and fills the gap between the top cover plate 1 and the pole 2, forming a strong and sealed connection structure.

[0049] The inclined section 21 of the pole post 2 forms an axial limit for the sealing ring 3. When the sealing ring 3 is fitted into place, the lower end face of the inclined section 21 is in close contact with the upper end face of the sealing ring 3. This can effectively prevent the sealing ring 3 from tilting upward when subjected to external force during injection molding or assembly, ensuring that the sealing ring 3 always maintains a tight fit with the pole post 2 and the top cover plate 1, thereby ensuring the sealing performance of the cover plate structure.

[0050] See appendix Figure 2 The outer surface of the inclined section 21 is provided with raised and recessed textures 21b. After injection molding, the upper plastic part 4 is tightly bonded to the outer surface of the inclined section 21 and filled with raised and recessed textures 21b (knurling). The raised and recessed textures 21b increase the contact area and form a mechanical interlock, thereby increasing the friction between the upper plastic part 4 and the inclined section 21 of the pole post 2, significantly improving the bonding strength between the upper plastic part 4 and the pole post 2, and thus increasing the push-button force of the pole post 2, effectively preventing the pole post 2 from loosening from the cover plate structure.

[0051] The raised and recessed texture 21b is a grid pattern with a relatively small texture depth, such as 0.1mm-0.3mm. In this embodiment, the texture depth is 0.2mm. The grid pattern enables the upper plastic part 4 and the inclined section 21 of the pole post 2 to form a uniform interlocking structure, avoiding cracking of the plastic part caused by local stress concentration. At the same time, the reasonable texture depth setting can ensure sufficient bonding strength and prevent the structural strength of the pole post 2 from decreasing due to the texture processing.

[0052] In another possible embodiment, an annular groove is provided on the outer surface of the inclined section 21. After the upper plastic part 4 is injection molded, it is tightly bonded to the outer surface of the inclined section 21 and fills the annular groove. The annular groove forms a locally reinforced engagement with the upper plastic part 4, which can also improve the bonding strength between the upper plastic part 4 and the pole post 2.

[0053] See appendix Figure 3 The outer surface of the inclined section 21 is inclined at a certain angle relative to the axis of the pole post 2. The included angle α between the two can be 5°~35°, preferably 10°. This inclined angle is set to provide a stable axial limiting force for the sealing ring 3, effectively preventing the sealing ring 3 from lifting, and also to avoid problems such as difficulty in installing the sealing ring 3 due to an excessively large angle, or incomplete filling and air bubbles during injection molding of the upper plastic part 4 due to an excessively steep incline, thus ensuring the molding quality of the upper plastic part 4.

[0054] See appendix Figure 5 and attached Figure 6An annular protrusion 12 is provided around the pole mounting hole 11 on the upper surface of the top cover plate 1. The annular protrusion 12 extends away from the lower plastic part 5, and its inner sidewall cooperates with the outer side of the inclined section 21 to form a clamping effect on the upper plastic part 4. Since the inclined section 21 is inclined downward, its upper part is closer to the inner sidewall of the annular protrusion 12, and its lower part is farther away, forming a clamping space that is larger at the bottom and smaller at the top. This structure can form a two-way limit on the upper plastic part 4, effectively preventing the upper plastic part 4 from coming out of the pole 2 and the top cover plate 1 in the vertical direction.

[0055] In this embodiment, the annular protrusion structure 12 also has two stepped surfaces formed on its radially outer side. The first stepped surface 121 on the radially inner side is higher than the second stepped surface 122 on the radially outer side. After injection molding, the upper plastic part 4 covers each stepped surface of the annular protrusion structure 12. The stepped surfaces of different heights form a stepped fit with the upper plastic part 4, which extends the force path of the upper plastic part 4, further enhances the connection stability between the upper plastic part 4 and the top cover plate 1, and improves the anti-detachment ability of the upper plastic part 4.

[0056] Each step surface has multiple notches distributed along the circumference, with the notches on adjacent step surfaces staggered in the circumferential direction. In this embodiment, eight first step surface notches 121a are provided on the outer side of the first step surface 121, and similarly, eight second step surface notches 122a are provided on the outer side of the second step surface 122. The first step surface notches 121a and second step surface notches 122a are staggered. The staggered notches cause the upper plastic part 4 to form protrusions corresponding to the notches after injection molding, thereby restricting the relative rotation between the upper plastic part 4, the pole post 2, and the top cover plate 1, and preventing the relative rotation of the three components due to vibration or external force from damaging the seal or electrical connection. Multiple sets of staggered notches form multiple anti-rotation limits in the circumferential direction, which can further improve the anti-rotation capability between the components and strengthen the overall structural stability.

[0057] The materials selected for the upper plastic part 4 and the lower plastic part 5 must meet the requirements of the internal operating environment of the battery. The upper plastic part 4 can be made of PPS (polyphenylene sulfide) plastic raw material, because it has excellent resistance to electrolyte corrosion, insulation and high temperature resistance, is suitable for injection molding and can form a stable bond with the terminal post 2 and the top cover plate 1. The lower plastic part 5 is preferably PP (polypropylene), which has good welding performance and is suitable for forming a firm connection with the top cover plate 1 by ultrasonic welding, while also having good insulation and chemical resistance.

[0058] The lower surface of the top cover plate 1 is provided with a limiting recess 13 around the pole mounting hole 11. During assembly, the outer periphery of the sealing ring 3 cooperates with the inner wall of the limiting recess 13 to achieve radial compression limiting of the sealing ring 3.

[0059] The assembly process of this cover plate structure is as follows:

[0060] First, the sealing ring 3 is fitted axially from the upper end of the pole post 2 to the straight section 22. Since the inclined section 21 of the pole post 2 is inclined outward along the axis and its diameter is larger than that of the straight section 22, it forms a structure that is wider at the top and narrower at the bottom. When the sealing ring 3 comes into contact with the inclined section 21 during the fitting process, the inclined section 21 will generate a downward axial resistance force on the sealing ring 3, which restricts the sealing ring 3 from moving upward. This prevents the sealing ring 3 from tilting upward due to operational disturbances or extrusion during the fitting process and subsequent assembly and injection molding. At the same time, the interference fit between the straight section 22 and the sealing ring 3 makes the sealing ring 3 tightly wrap around the straight section 22, restricting the sealing ring 3 from rotating circumferentially or shifting radially along the straight section 22, ensuring that the sealing ring 3 and the pole post 2 remain coaxial.

[0061] Then, the pole post 2-sealing ring 3 assembly and the top cover plate 1 are pre-assembled. The pole post 2 with the sealing ring 3 is inserted from the lower surface of the top cover plate 1 into the pole post mounting hole 11 until the sealing ring 3 is embedded in the limiting recess 13 of the top cover plate 1, and the inner wall of the recess is in contact with the outer periphery of the sealing ring 3. At this time, the sealing ring 3 is limited between the flange 23 and the limiting recess 13, realizing bidirectional positioning.

[0062] Next, the upper plastic part 4 is injection molded. The pre-assembled top cover plate 1, pole 2, and sealing ring 3 assembly are placed into the injection mold, and molten plastic material is injected into the gap between the pole 2 and the pole mounting hole 11. After the plastic cools and solidifies, the upper plastic part 4 is formed. During the injection process, the molten plastic will generate radial extrusion and axial thrust on the sealing ring 3. At this time, the axial blocking force of the inclined section 21 of the pole 2 and the radial constraint of the limiting recess 13 of the sealing ring 3 work together to resist the influence of injection pressure on the sealing ring 3 and prevent the sealing ring 3 from being pushed up or deformed by extrusion. At the same time, after the upper plastic part 4 is solidified, it engages with the concave and convex texture 21b (or annular groove) of the inclined section 21 of the pole 2 and fits into the notch of the stepped structure of the top cover plate 1, which indirectly enhances the stability of the pole 2 and further ensures that the sealing ring 3 is in the preset sealing position, avoiding misalignment of the sealing surface due to the offset of the pole 2.

[0063] Finally, ultrasonic welding of the lower plastic part 5 is performed. The lower plastic part 5 is aligned with the preset position on the lower surface of the top cover plate 1, and the ultrasonic welding equipment is started. High-frequency vibration causes the lower plastic part 5 to partially melt, forming a firm connection with the lower surface of the top cover plate 1 and the straight section 22 of the pole post 2. After melting, the lower plastic part 5 fills the gap between the flange 23 of the pole post and the top cover plate 1, which not only improves the overall insulation performance, but also prevents electrolyte or impurities from entering the sealing surface of the sealing ring 3 from the gap, ensuring the long-term sealing reliability of the sealing ring 3.

[0064] This application also provides an energy storage battery, including a casing, at least one battery cell housed within the casing, a current collector assembly electrically connecting the battery cells, and a cover structure as described above. The cover structure covers the opening of the casing and seals the casing. The lower end of the terminal extends into the casing and is electrically connected to the current collector assembly, while the upper end extends out of the casing to achieve power output. The high sealing performance of the cover structure effectively prevents electrolyte leakage and the intrusion of external impurities. Simultaneously, the anti-rotation and anti-detachment structures ensure a stable electrical connection between the terminal and the current collector assembly, thereby improving the overall reliability, electrical safety, and service life of the energy storage battery.

[0065] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A cover plate structure, characterized in that, include: Top cover plate (1), wherein the top cover plate (1) is provided with pole mounting hole (11); The pole post (2) is disposed in the pole post mounting hole (11); A sealing ring (3) is fitted over the pole post (2) and seals the gap between the pole post (2) and the top cover plate (1); The upper plastic part (4) is injection molded between the pole post (2), the pole post mounting hole (11) and the sealing ring (3); The lower plastic part (5) is attached to the lower surface of the top cover piece (1); The pole post (2) includes a coaxially connected inclined section (21) and a straight section (22). The upper diameter of the inclined section (21) is larger than the lower diameter, so that its outer surface forms a frustum (21a). The lower part of the inclined section (21) has the same diameter as the straight section (22) and is smoothly connected. The sealing ring (3) is pressed axially to the bottom of the pole post (2) and sleeved on the outer periphery of the straight section (22).

2. The cover plate structure according to claim 1, characterized in that, The outer surface of the inclined section (21) is provided with concave and convex textures (21b). After the upper plastic part (4) is injection molded, it is tightly bonded to the outer surface of the inclined section (21) and fills the concave and convex textures (21b).

3. The cover plate structure according to claim 2, characterized in that, The raised and recessed texture (21b) is a grid pattern, and the texture depth is 0.1 mm to 0.3 mm.

4. The cover plate structure according to claim 1, characterized in that, An annular groove is provided on the outer side of the inclined section (21). After the upper plastic part (4) is injection molded, it is tightly combined with the outer side of the inclined section (21) and fills the annular groove.

5. The cover plate structure according to claim 1, characterized in that, The outer surface of the inclined section (21) has an inclination angle of 5° to 35° relative to the axial direction.

6. The cover plate structure according to claim 1, characterized in that, The upper surface of the top cover (1) is provided with an annular protrusion structure (12) around the pole mounting hole (11). The inner sidewall of the annular protrusion structure (12) cooperates with the outer side of the inclined section (21) to form a clamping of the upper plastic part (4).

7. The cover plate structure according to claim 6, characterized in that, The annular protrusion structure (12) has at least two stepped surfaces along its radial outer side, wherein the stepped surface located on the radial inner side is higher than the stepped surface on the radial outer side, and the upper plastic part (4) covers each of the stepped surfaces of the annular protrusion structure (12).

8. The cover plate structure according to claim 7, characterized in that, Each of the steps has multiple notches distributed along the circumference, and the notches of adjacent steps are staggered in the circumference.

9. The cover plate structure according to claim 1, characterized in that, The lower surface of the top cover plate (1) is provided with a limiting recess (13) around the position of the pole mounting hole (11). During assembly, the limiting recess (13) is used to compress and limit the sealing ring (3).

10. An energy storage battery, characterized in that, It includes a housing, at least one battery cell housed within the housing, and a cover structure as described in any one of claims 1 to 9, the cover structure covering the opening end of the housing.

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