Pole assembly and assembling method thereof, cover plate structure and energy storage battery

Abstract

The invention provides a pole assembly and an assembling method thereof, a cover plate structure and an energy storage battery, the pole assembly comprises a pole, a sealing ring, a pressing ring and an upper plastic part, the pole is provided with an outer convex part, the projection of the outer convex part in the vertical direction covers part of the surface of the pressing ring to form a lap joint surface, and the upper plastic part is provided with a sealing ring. The space between the lower surface of the outer protruding part and the lap joint face of the pressing ring is completely filled with the upper plastic part in the vertical direction. By means of the split design that the pressing ring is independently detached from the top cover piece, the overall size of a product during injection molding can be reduced, multiple assemblies can be machined through one-time injection molding, and the production efficiency is improved; the lower surface of the outer convex part is axially matched with the lap joint surface of the compression ring, and the upper plastic part is filled, so that anti-push-pull support is formed, and the sealing effect and the structural strength are enhanced.

Description

Technical Field

[0001] This invention relates to the field of energy storage batteries, specifically to an electrode assembly and its assembly method, a cover plate structure, and an energy storage battery. Background Technology

[0002] Existing energy storage battery top covers typically include a top cover sheet, positive terminal post, negative terminal post, upper plastic parts for the positive and negative terminals, sealing rings, and lower plastic parts. The top cover sheet has terminal post mounting holes. After the sealing rings are fitted onto the positive and negative terminals respectively, they are placed into the mounting holes. Then, the upper plastic parts for the positive and negative terminals are filled with plastic parts to fill the gap between the terminals and the top cover sheet through injection molding, which also compresses the sealing rings to ensure a sealing effect.

[0003] However, the existing top cover structure and assembly method have significant shortcomings. On the one hand, due to the large size of the top cover itself, the overall volume of the product to be processed in a single injection molding operation is large, which limits the number of plastic parts that can be processed simultaneously in each injection process, hindering the improvement of production efficiency. On the other hand, the terminals need to withstand certain push-pull and torsional forces in actual use, but the way the terminals are fitted with the top cover and plastic in the existing structure makes it difficult for the terminals to obtain sufficient resistance to push-pull and torsion, which can easily affect the overall structural stability of the battery top cover and may adversely affect the reliability of the energy storage battery.

[0004] Therefore, how to overcome the shortcomings of the existing technology is the subject of this invention. Summary of the Invention

[0005] The purpose of this invention is to provide an electrode assembly and its assembly method, cover plate structure and energy storage battery, so as to improve injection molding efficiency and ensure that the electrode has sufficient resistance to push and pull.

[0006] To achieve the above objectives, a first aspect of the present invention provides a pole assembly, comprising:

[0007] An electrode post, comprising a column body, wherein the side of the column body extends outward to form an outward protrusion, and the bottom of the column body extends outward to form a flange;

[0008] A sealing ring is fitted around the outer periphery of the cylinder, and the lower surface of the sealing ring is in contact with the upper surface of the flange.

[0009] A pressure ring, adapted to the shape of the column, is spaced and fitted around the outer periphery of the column. The lower surface of the pressure ring fits against the upper surface of the sealing ring. The projection of the outward protrusion in the vertical direction covers part of the surface of the pressure ring to form an overlapping surface.

[0010] The upper plastic part fills the gap formed between the column, the sealing ring and the pressure ring, and the upper plastic part completely fills the space between the lower surface of the protrusion and the overlapping surface of the pressure ring in the vertical direction.

[0011] In the above solution, the overall volume of the product during injection molding is reduced by the split design of the pressure ring, enabling multiple components to be processed in a single injection, thereby improving production efficiency. The lower surface of the outward protrusion and the overlapping surface of the pressure ring are axially matched to form a push-pull support. The pre-fitting of the sealing ring achieves initial sealing, and the filling of the upper plastic part further strengthens the sealing and structural connection, taking into account both efficient processing and basic performance.

[0012] In a further technical solution, the overlapping surface of the pressure ring is sunk to form a limiting step, and the accommodating space formed by the limiting step is adapted to the shape and size of the outward protrusion so as to limit the outward protrusion during assembly.

[0013] The above solution provides a clear positioning reference for the assembly of the pole and the pressure ring, eliminating the need for additional tooling calibration and reducing assembly difficulty.

[0014] In a further technical solution, the pole post has two protruding parts, which are respectively located on opposite sides of the pole body.

[0015] In the above scheme, the two symmetrically distributed protrusions avoid installation obstruction problems, and the pressure ring can be smoothly inserted into the column along the tilt angle, reducing structural interference during assembly; the symmetrical structure makes the pressure ring evenly stressed, avoiding deformation of the pressure ring or pole due to unilateral stress, and improving the assembly yield.

[0016] In a further technical solution, the cross-section of the pole is not circular, the inner hole shape of the pressure ring is adapted to the cross-sectional shape of the pole, and the space between the inner wall of the pressure ring and the outer wall of the pole is filled with plastic.

[0017] In the above scheme, the non-circular cylinder and the matching inner hole form a circumferential limit, which effectively prevents the relative torsion between the pole and the pressure ring, and significantly improves the anti-torsion performance; the clearance fit ensures that the pressure ring can be smoothly fitted in, and avoids excessive shaking after assembly, taking into account both assembly convenience and structural stability.

[0018] In a further technical solution, at least one annular groove is provided on the upper surface of the pressure ring, and a portion of the upper plastic part is embedded in the annular groove to form an engagement.

[0019] In the above solution, the interlocking structure between the upper plastic part and the annular groove greatly enhances the connection strength between the two, preventing the upper plastic part from separating from the pressure ring due to vibration and temperature difference during long-term use; at the same time, the interlocking structure further restricts the relative rotation in the circumference, which, combined with the anti-torsion effect of the non-circular column, improves the overall anti-torsion performance of the pole post assembly.

[0020] According to a second aspect of this application, a cover plate structure is provided, including an electrode post assembly as described in the first aspect, and further including a top cover plate and a lower plastic part; the pressure ring of the electrode post assembly is fixedly connected to the top cover plate by welding, the top cover plate has a mounting hole for the electrode post to pass through, the end of the electrode post away from the flange passes through the mounting hole and extends to the side of the top cover plate opposite to the pressure ring; the lower plastic part is disposed on the side of the top cover plate opposite to the pressure ring, and the lower plastic part is in contact with the top cover plate.

[0021] The above solution integrates the advantages of small size, easy injection molding, and resistance to push-pull and torsion of the pole assembly. The connection strength between the pressure ring and the top cover is ensured by welding, which prevents the pressure ring from falling off after long-term use. The lower plastic part initially realizes the insulation protection of the back side of the top cover, and improves the basic insulation performance of the cover plate structure.

[0022] In a further technical solution, the upper surface of the top cover plate has a mounting groove formed around the mounting hole, and the pressure ring is accommodated within the mounting groove. This facilitates positioning during the welding of the pressure ring and the top cover plate.

[0023] In a further technical solution, the lower plastic part has an annular protrusion on the side facing the top cover plate, and the annular protrusion is embedded in and fills the gap between the top cover plate and the flange of the pole post.

[0024] In the above scheme, the annular protrusion can fill the gap between the pole and the mounting hole, increase the creepage distance, and improve the insulation performance.

[0025] According to a third aspect of this application, an energy storage battery is provided, including a housing, at least one battery cell housed within the housing, and a cover structure as described in the second aspect, the cover structure covering an opening end of the housing.

[0026] The above solution inherits the advantages of the cover plate structure, ensuring that the top cover of the energy storage battery can withstand pushing, pulling and torsional forces, avoiding structural failure; the sealed connection ensures the airtightness and liquid tightness of the battery, preventing electrolyte leakage or the entry of external moisture and impurities, improving the reliability and service life of the energy storage battery, while reducing the processing cost in the battery production process.

[0027] According to a fourth aspect of this application, a method for assembling a pole post assembly is provided, comprising the following steps:

[0028] S1. Elastically open the sealing ring and wrap it around the outer protrusion on the side of the pole post. Slide it into the pole post from the top along the axial direction of the pole body, so that the lower surface of the sealing ring fits tightly against the upper surface of the flange at the bottom of the pole post, thus completing the positioning and assembly of the sealing ring.

[0029] S2. Tilt the pressure ring at a certain angle so that one side of it passes over the outer protrusion and enters the position between the outer protrusion and the sealing ring. Move the pressure ring to the other side in the horizontal direction, and then rotate the other side of the pressure ring so that it passes over another outer protrusion.

[0030] S3. By clamping the pressure ring, the protruding part of the pole post is placed within the limiting step, and the pre-installed pole post assembly is transferred into the injection mold.

[0031] S4. Loosen the pressure ring so that its lower surface fits against the upper surface of the sealing ring after it falls down, while ensuring that the distance between the outer wall of the pole post and the inner wall of the pressure ring is uniform in all circumferential directions.

[0032] S5. Inject the plastic raw material into the gap formed between the column, the sealing ring and the pressure ring, and ensure that the space between the lower surface of the outer protrusion of the pole post and the overlapping surface of the pressure ring is completely filled. After cooling and demolding, the upper plastic part is formed, and the assembly of the pole post assembly is completed.

[0033] In the above solution, pre-assembly to form independent components enables multiple sets of simultaneous injection molding, which greatly improves injection molding efficiency; automatic positioning is achieved by using the structural adaptation of the sinking of the overlapping surface, eliminating the need for complex tooling and simplifying the alignment process; in addition, a stable overlapping support is formed between the outward protrusion and the overlapping surface, which effectively improves the resistance to push and pull.

[0034] The technical solution provided in this application has the following beneficial effects:

[0035] By separating the pressure ring from the top cover plate, the overall volume of the product during injection molding is reduced, enabling multiple components to be processed in a single injection, thus improving production efficiency.

[0036] Meanwhile, by axially engaging the lower surface of the protruding part with the overlapping surface of the pressure ring and filling it with plastic to form a vertical support, the resistance to push and pull of the pole assembly is improved.

[0037] In addition, the lap surface between the protrusion on the pole and the pressure ring can be fitted together during assembly to achieve transfer and positioning; it can also be fitted together after assembly to achieve structural reinforcement. Attached Figure Description

[0038] Appendix Figure 1 This is an exploded view of the pole assembly provided in an embodiment of the present invention;

[0039] Appendix Figure 2 A diagram of the pole post structure provided in an embodiment of the present invention;

[0040] Appendix Figure 3 This is a diagram of the compression ring structure provided in an embodiment of the present invention;

[0041] Appendix Figure 4 This is a schematic diagram of the pole post assembly process provided in an embodiment of the present invention;

[0042] Appendix Figure 5 For the appendix Figure 4 Enlarged view of section A in the image;

[0043] Appendix Figure 6 This is an exploded view of the cover plate structure provided in an embodiment of the present invention;

[0044] Appendix Figure 7 This is a cross-sectional view of the cover plate structure provided in an embodiment of the present invention;

[0045] Appendix Figure 8 For the appendix Figure 7 A magnified view of a section at point B in the middle;

[0046] Appendix Figure 9 This is a structural diagram of the top cover sheet provided in an embodiment of the present invention;

[0047] Appendix Figure 10 This is a structural diagram of the lower plastic part provided in an embodiment of the present invention;

[0048] In the above attached figures: 1-Pole assembly; 2-Pole; 21-Pole body; 22-Outer protrusion; 23-Flange; 3-Sealing ring; 4-Pressure ring; 4a-Overlapping surface; 41-Limiting step; 42-Annular groove; 5-Upper plastic part; 6-Top cover plate; 61-Top cover plate mounting hole; 62-Mounting groove; 63-Injection hole; 64-Explosion-proof valve; 65-Welding groove; 7-Lower plastic part; 71-Lower plastic part mounting hole; 72-Annular protrusion. Detailed Implementation

[0049] 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.

[0050] 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.

[0051] 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.

[0052] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0053] 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.

[0054] See appendix Figure 1 This application provides a terminal post assembly 1 for use on the top cover structure of an energy storage battery. The assembly includes a terminal post 2, a sealing ring 3, a pressure ring 4, and an upper plastic part 5. It should be noted that the terminal post assembly 1 can be either a positive terminal post assembly 1 or a negative terminal post assembly 1.

[0055] The structure of pole 2 is as follows: Figure 2 As shown. The pole post 2 mainly includes a column 21, with an outwardly protruding part 22 extending outward from the side of the column 21, and a flange 23 extending outward from the bottom of the column 21. The flange 23 is used to support the sealing ring 3 and the pressure ring 4. The pole post 2 can be made of copper alloy or aluminum alloy.

[0056] The sealing ring 3 is fitted around the outer periphery of the column 21. The lower surface of the sealing ring 3 is in close contact with the upper surface of the flange 23. The upper surface of the sealing ring 3 is used to fit with the pressure ring 4 to achieve a seal between the pole post 2 and the pressure ring 4.

[0057] The structure of the pressure ring 4 is as follows Figure 3 As shown, its overall shape is adapted to the shape of the column 21. For example, when the column 21 is a rectangular column, the overall shape of the pressure ring 4 is also approximately rectangular. The pressure ring 4 is spaced apart and fitted around the outer periphery of the column 21. The lower surface of the pressure ring 4 is in contact with the upper surface of the sealing ring 3. Subsequently, the pressure ring 4 can be connected to the top cover plate 6 in the battery cover structure by welding (such as laser welding, resistance welding, etc.). The pressure ring 4 can also be made of copper alloy or aluminum alloy, and the material composition can be adjusted according to the welding compatibility with the top cover plate 6.

[0058] In addition, the size of the inner ring of the pressure ring 4 is smaller than the maximum profile size formed by the outer protrusion 22 of the pole post 2. Therefore, the projection of the outer protrusion 22 in the vertical direction will cover part of the surface of the pressure ring 4. This part of the surface forms the overlapping surface 4a, which provides a structural basis for subsequent anti-push and pull support.

[0059] The upper plastic component 5 fills the gap formed between the column 21, the sealing ring 3, and the pressure ring 4 to achieve structural connection and insulation. Specifically, the upper plastic component 5 completely fills the space between the lower surface of the outwardly protruding portion 22 and the overlapping surface 4a of the pressure ring 4 in the vertical direction. Figure 5The space D marked in the diagram. Because the lower surface of the protrusion 22 and the overlapping surface 4a of the pressure ring 4 overlap in the vertical direction and are filled by the upper plastic part 5, an "overlapping" effect is formed, which can provide stable anti-push and pull support, avoid vertical loosening between the pole post 2 and the pressure ring 4, and ensure the structural stability of the pole post assembly 1.

[0060] Furthermore, the split design of the pressure ring 4 reduces the overall volume of the product during injection molding, enabling the processing of multiple components in a single injection, significantly improving production efficiency. In previous battery cover structures, the terminal post 2 was directly assembled with the top cover plate 6. When injection molding the plastic parts 5, the size of the top cover plate 6 limited the number of plastic parts 5 that could be injection molded at a time. However, the terminal post assembly 1 provided in this embodiment is much smaller than the top cover plate 6, allowing for the injection of more units at a time. The structural design also ensures a stable connection between the terminal post 2 and the pressure ring 4, balancing efficient processing with basic performance.

[0061] Figure 4 The assembly process and method of the pole assembly 1 are shown. First, as shown in Step 1, the sealing ring 3 is opened so that it passes around the outer protrusion 22 and is inserted from the upper end of the pole 2, so that the sealing ring 3 is fitted onto the outer surface of the pole 2 and rests on the flange 23 of the pole 2.

[0062] Then, as shown in Step 2, the pressure ring 4 is slipped onto the upper end of the pole post 2. Since the pressure ring 4 cannot deform elastically, in order to smoothly assemble the pressure ring 4 onto the pole post 2, in this embodiment, the pole post 2 has two external protrusions 22, which are respectively located on opposite sides of the post 21 and are symmetrical about the center of the post 21. During assembly, the pressure ring 4 can be tilted, first passing one side around the external protrusion 22 and placing it between the external protrusion 22 and the sealing ring 3, then moving it horizontally a distance to the other side and rotating the other side to pass around the external protrusion 22 on that side, so that the entire pressure ring 4 is placed between the external protrusion 22 and the sealing ring 3.

[0063] The two symmetrically distributed protrusions 22 can not only avoid installation obstruction problems, allowing the pressure ring 4 to be smoothly inserted into the column 21 along the tilt angle, reducing structural interference during assembly; but also ensure that the pole post 2 is subjected to uniform force after injection molding, preventing the pole post 2 from deforming due to unilateral force.

[0064] In a possible embodiment, three protrusions 22 may be provided, two of which are symmetrically distributed as described above and located at the same height, and the third protrusion is provided on the other side of the column 21 and is staggered in height from the first two, for example, it may be higher than the first two protrusions 22. During assembly, the pressure ring 4 is first wrapped around this protrusion 22, and then wrapped around the other two protrusions 22 by the aforementioned inclined assembly method.

[0065] It is easy to understand that multiple protrusions 22 can be set in this way, and effective assembly can be achieved. Setting more protrusions can improve the resistance to push and pull of the pole assembly 1 to a certain extent. If only one protrusion 22 is set, although it can also provide a certain resistance to push and pull, the force on the pole 2 is not as strong as the combined force of two symmetrically set protrusions 22.

[0066] After the pressure ring 4 is fitted onto the outside of the pole post 2, the pole post 2, the sealing ring 3 and the pressure ring 4 need to be transferred together into the injection mold. Then the injection mold is closed and the plastic raw material is injected into the cavity for injection molding.

[0067] Furthermore, the overlapping surface 4a of the pressure ring 4 can be sunk to form a limiting step 41. The accommodating space formed by the limiting step 41 is adapted to the shape and size of the protrusion 22 so that the protrusion 22 can be placed in the injection mold when it is transferred to form a reliable limiting for the protrusion 22.

[0068] See Figure 4 In Step 3, the pressure ring 4 is held in place by a tooling fixture, allowing the outer protrusion 22 of the pole post 2 to fall into the limiting step 41. Then, the pole post assembly 1 is transferred into the positioning groove in the injection mold. During this process, the overlapping surface 4a is used to support the pole post 2, and the limiting step 41 forms a circumferential positioning for the pole post 2.

[0069] See Figure 4 In Step 4, due to the limiting step 41's limiting effect on the pole post 2, when the pressure ring 4 is released and allowed to fall naturally onto the sealing ring 3, the distance from the outer wall of the pole post 2 to the inner wall of the pressure ring 4 is basically uniform in all directions. By sinking the overlapping surface 4a of the pressure ring 4 to form the limiting step 41, no additional tooling calibration is required, simplifying the assembly process and reducing the difficulty of manual operation.

[0070] See Figure 4 In Step 5, after placing the pressure ring 4 on the sealing ring 3, plastic is filled into the gap between the pole post 2, the sealing ring 3, and the pressure ring 4. After cooling and demolding, the upper plastic part 5 is formed, completing the assembly of the pole post assembly. The upper plastic fills the space D formed between the lower surface of the outward protrusion 22 and the overlapping surface 4a of the pressure ring 4 to provide sufficient support, thereby improving the resistance of the pole post 2 to push and pull.

[0071] To improve torsional resistance, the cross-section of the pole post 21 can be designed as non-circular (such as rectangular, rounded rectangle, regular hexagon, etc.). The inner hole shape of the pressure ring 4 is adapted to the cross-sectional shape of the pole post 21, and the space between the inner wall of the pressure ring 4 and the outer wall of the pole post 21 is filled with the upper plastic part 5. The cooperation between the non-circular pole post 21, the pressure ring 4, and the upper plastic part 5 forms a circumferential limit, which can effectively prevent relative torsion between the pole post 2 and the pressure ring 4, thereby improving torsional resistance.

[0072] Based on this, an annular groove 42 can be formed on the upper surface of the pressure ring 4, and part of the upper plastic part 5 is embedded in the annular groove 42 to form an interlocking structure. The interlocking structure between the upper plastic part 5 and the annular groove 42 greatly enhances the connection strength between the two, preventing the upper plastic part 5 from separating from the pressure ring 4 due to vibration and temperature difference during long-term use; at the same time, the interlocking structure further restricts circumferential relative rotation, which, combined with the anti-torsional effect of the non-circular column 21, improves the overall anti-torsional performance of the pole post assembly 1. It is conceivable that multiple annular grooves 42 can be formed according to actual needs to further improve the interlocking effect.

[0073] like Figure 5 As shown, the final upper plastic part 5 fills the gap formed by the outer side of the column 21 of the pole post 2, the lower part and the outer side of the protrusion 22, the upper part of the sealing ring 3, and the upper part of the overlapping surface 4a of the pressure ring 4, and covers part of the upper surface of the pressure ring 4, including the annular groove 42, to ensure that there are no gaps between the components. After cooling and demolding, the upper plastic part 5 is fixed in shape.

[0074] The above assembly method improves injection molding efficiency. The injection process is not constrained by the size of the top cover plate, allowing multiple pre-assembled pole components to be simultaneously placed into a customized injection mold, enabling the processing of multiple pole components in a single injection. Simultaneously, it simplifies the alignment process. Utilizing the shape-adaptive characteristics of the limiting step 41, rapid circumferential alignment of the pole 2 and the pressure ring 4 is achieved. Furthermore, the overlapping surface 4a of the pole's protruding portion 22 and the pressure ring 4 forms an overlapping support structure through the upper plastic component 5. When the pole is subjected to vertical tension or pressure, the protruding portion 22 transmits the force to the pressure ring 4 through the upper plastic component 5, thereby improving the vertical resistance to push and pull of the pole 2. The protruding portion 22 and the overlapping surface 4a cooperate during assembly for transfer and positioning; they also cooperate after assembly for structural reinforcement.

[0075] like Figure 6 As shown in the embodiment of this application, a cover plate structure is also provided, including at least two of the above-mentioned electrode assembly 1, one of which is a positive electrode assembly 1A, including an electrode 2A, a pressure ring 4A, a sealing ring 3A, and an upper plastic part 5A; the other is a negative electrode assembly 1B, including an electrode 2B, a pressure ring 4B, a sealing ring 3B, and an upper plastic part 5B. It also includes a top cover plate 6 and a lower plastic part 7. The pressure rings 4A and 4B are fixedly connected to the top cover plate 6 by welding. The top cover plate 6 has a top cover plate mounting hole 61 for the electrode 2A and electrode 2B to pass through. The ends of the electrode 2A and electrode 2B away from the flange 23 pass through the top cover plate mounting hole 61 and extend to the side of the top cover plate 6 opposite to the pressure ring 4. The top cover plate 6 has an injection hole 63 and an explosion-proof valve 64.

[0076] The lower plastic part 7 is located on the side of the top cover plate 6 away from the pressure ring 4A and pressure ring 4B. The lower plastic part 7 is tightly fitted to the top cover plate 6 and connected by ultrasonic welding or other methods.

[0077] The cover plate structure integrates the advantages of the pole post assembly 1 in terms of small size, easy injection molding, and resistance to push-pull and torsion. The connection strength between the pressure ring 4 and the top cover plate 6 is ensured by welding, which prevents the pressure ring 4 from falling off during long-term use. The lower plastic part 7 provides insulation protection for the back side of the top cover plate 6, improves the basic insulation performance of the cover plate structure, and prevents the risk of leakage.

[0078] See Figure 9 In this embodiment, a mounting groove 62 is formed on the upper surface of the top cover plate 6 around the mounting hole 61 of the top cover plate. The pressure ring 4 can be accommodated in the mounting groove 62, thereby facilitating the positioning of the pressure ring 4 when welding the pressure ring 4 and the top cover plate 6. After the pole post assembly is installed, the upper surface of the pressure ring 4 is flush with the upper surface of the top cover plate 6 to facilitate the welding operation. The welding part can be either the upper surface of the pressure ring 4 and the top cover plate 6 or their lower surface, which can be selected according to the welding process and structural requirements.

[0079] like Figure 8 and Figure 9 As shown, in this embodiment, welding grooves 65 are also provided on the outer periphery of the upper surface of the pressure ring 4 and the outer periphery of the mounting groove 62 on the upper surface of the top cover plate 6 to facilitate welding.

[0080] See Figure 10 The lower plastic component 7 also has a mounting hole 71, and the flange portion of the electrode post 2 is installed within the mounting hole 71. Around the mounting hole 71, an annular protrusion 72 is provided on the side of the lower plastic component 7 facing the top cover plate 6. The annular protrusion 72 is embedded in the gap between the top cover plate 6 and the flange 23 of the electrode post 2, thereby increasing the creepage distance and improving insulation performance. Furthermore, the annular protrusion 72 enhances the connection stability between the lower plastic component 7 and the top cover plate 6, further ensuring the overall reliability of the cover plate structure.

[0081] This application also provides an energy storage battery, including a casing, at least one battery cell housed within the casing, and the aforementioned cover structure. The cover structure closes onto the opening of the casing to ensure sealing. The cover structure ensures that the terminal portion can withstand certain pushing, pulling, and torsional forces, preventing structural failure; and it ensures the battery's airtightness and liquid tightness, preventing electrolyte leakage or the entry of external moisture and impurities, significantly improving the reliability and lifespan of the energy storage battery.

[0082] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A pole post assembly (1), characterized in that, include: The pole post (2) includes a column (21), the side of the column (21) extends outward to form an outward protrusion (22), and the bottom of the column (21) extends outward to form a flange (23). A sealing ring (3) is fitted around the outer periphery of the column (21), and the lower surface of the sealing ring (3) is in contact with the upper surface of the flange (23). The pressure ring (4) is adapted to the shape of the column (21) and is spaced and fitted on the outer periphery of the column (21). The lower surface of the pressure ring (4) is in contact with the upper surface of the sealing ring (3). The projection of the protrusion (22) in the vertical direction covers part of the surface of the pressure ring (4) to form an overlapping surface (4a). The upper plastic part (5) fills the gap formed between the column (21), the sealing ring (3) and the pressure ring (4), and the upper plastic part (5) completely fills the space between the lower surface of the protrusion (22) and the overlapping surface (4a) of the pressure ring (4) in the vertical direction.

2. The pole assembly (1) according to claim 1, characterized in that, The pole post (2) has two protruding parts (22), which are symmetrically arranged on opposite sides of the post (21).

3. The pole assembly (1) according to claim 2, characterized in that, The overlapping surface (4a) of the pressure ring (4) is sunk to form a limiting step (41). The accommodating space formed by the limiting step (41) is adapted to the shape and size of the protrusion (22) so as to limit the protrusion (22) during assembly.

4. The pole assembly (1) according to claim 1, characterized in that, The cross-section of the column (21) of the pole (2) is not circular, and the inner hole shape of the pressure ring (4) is adapted to the cross-sectional shape of the column (21).

5. The pole assembly (1) according to claim 4, characterized in that, At least one annular groove (42) is provided on the upper surface of the pressure ring (4), and part of the structure of the upper plastic part (5) is embedded in the annular groove (42) to form an engagement.

6. A cover plate structure, characterized in that: The electrode assembly (1) according to any one of claims 1 to 5 further includes a top cover plate (6) and a lower plastic part (7); the top cover plate (6) has a mounting hole for the electrode post (2) to pass through, and the end of the electrode post (2) away from the flange (23) passes through the mounting hole and extends to the side of the top cover plate (6) away from the pressure ring (4); the pressure ring (4) of the electrode assembly (1) is fixedly connected to the top cover plate (6) by welding; the lower plastic part (7) is disposed on the side of the top cover plate (6) away from the pressure ring (4), and the lower plastic part (7) is fitted and connected to the top cover plate (6).

7. The cover plate structure according to claim 6, characterized in that, The upper surface of the top cover plate (6) has a mounting groove (62) formed around the mounting hole, and the pressure ring (4) is accommodated in the mounting groove (62).

8. The cover plate structure according to claim 7, characterized in that, The lower plastic part (7) has an annular protrusion (72) on the side facing the top cover (6), and the annular protrusion (72) is embedded in and fills the gap between the top cover (6) and the flange (23) of the pole post (2).

9. 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 6 to 8, the cover structure covering the opening end of the housing.

10. A method for assembling a pole assembly as described in any one of claims 3 to 5, characterized in that, Includes the following steps: S1. Elastically open the sealing ring and wrap it around the outer protrusion on the side of the pole post. Slide it into the pole post from the top along the axial direction of the pole body, so that the lower surface of the sealing ring fits tightly against the upper surface of the flange at the bottom of the pole post, thus completing the positioning and assembly of the sealing ring. S2. Tilt the pressure ring at a certain angle so that one side of it passes over the outer protrusion and enters the position between the outer protrusion and the sealing ring. Move the pressure ring to the other side in the horizontal direction, and then rotate the other side of the pressure ring so that it passes over another outer protrusion. S3. By clamping the pressure ring, the protruding part of the pole post is placed within the limiting step, and the pre-installed pole post assembly is transferred into the injection mold. S4. Loosen the pressure ring so that its lower surface fits against the upper surface of the sealing ring after it falls down, while ensuring that the distance between the outer wall of the pole post and the inner wall of the pressure ring is uniform in all circumferential directions. S5. Inject the plastic raw material into the gap formed between the column, the sealing ring and the pressure ring, and ensure that the space between the lower surface of the outer protrusion of the pole post and the overlapping surface of the pressure ring is completely filled. After cooling and demolding, the upper plastic part is formed, and the assembly of the pole post assembly is completed.

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