A battery top cover assembly with strong sealing performance

Abstract

The utility model discloses a kind of battery top cover assemblies of strong sealing performance, including top cover sheet, it has the through-hole for pole post to pass and set, the through-hole outer periphery edge is extended and is formed with ring edge along height direction, the ring edge upper side free end is formed with stop portion by folding towards the through-hole inside, pole post is prepositioned in the through-hole by positioning clamp, and annular gap is formed between the pole post and the inner wall of through-hole, upper plastic is injection molded in the ring edge and annular gap, and with pole post, ring edge and stop portion closely adhere, to limit the pole post and be fixed in through-hole, the upper plastic includes integrally formed first snap ring and second snap ring, the first snap ring is arranged on the outside of ring edge, the second snap ring is arranged in cooperation with stop portion and part enters the annular gap, the technical scheme of the utility model, it is simple in structure, strong in sealing, easy to realize and low in cost, solve the problem of existing battery cover plate injection molding glue leakage, poor sealing.

Description

Technical Field

[0001] This utility model relates to the field of battery top cover technology, and specifically to a battery top cover assembly with strong sealing performance. Background Technology

[0002] In the manufacturing of lithium-ion batteries and other rechargeable batteries, the sealing performance and structural stability of the top cover assembly are crucial to the safety and lifespan of the battery. In existing technologies, the fixing and sealing process for the terminals typically involves: first, pre-fixing components such as the sealing ring and bottom sealing plate below the terminal; then, using injection molding to form an upper plastic layer, which is used to limit and fix the terminal within the through-hole of the top cover plate.

[0003] However, in this traditional process, the injection molding compound produced during the top layer is highly susceptible to impact or seepage into the already installed sealing ring and bottom sealing plate area due to the high pressure. This results in some injection molding compound leakage residue remaining on the sealing ring and bottom sealing plate, affecting the product's appearance and assembly accuracy, and may even damage the established sealing structure, thereby increasing the risk of battery leakage. Furthermore, the annular gap formed between the existing terminal post and the top cover plate's through-hole is the main channel for leakage, and the existing sealing ring structure cannot completely cover this gap, resulting in insufficient sealing reliability. Utility Model Content

[0004] This utility model provides a battery top cover assembly with strong sealing performance. It features a simple structure, strong sealing performance, ease of implementation, and low cost, solving the problems of injection molding leakage and poor sealing performance in existing battery cover panels. Its main technical solution is as follows:

[0005] A battery top cover assembly with strong sealing performance includes a top cover sheet having a through hole for a terminal post to pass through. The outer periphery of the through hole extends along its height to form a ring edge, and the upper free end of the ring edge is folded towards the inside of the through hole to form a stop portion. A terminal post is pre-positioned within the through hole by a positioning clamp, and an annular gap is formed between the terminal post and the inner wall of the through hole. An upper plastic layer is injection molded within the ring edge and the annular gap, and is tightly fitted to the terminal post, the ring edge, and the stop portion to limit and fix the terminal post within the through hole. The upper plastic layer includes integrally molded components. The system includes a first retaining ring and a second retaining ring. The first retaining ring is engaged with the outer side of the ring edge, and the second retaining ring engages with the stop part and partially enters the annular gap. A sealing ring is used to be fitted under the pole post after the upper plastic is molded, and is located below the upper plastic. The upper end face of the sealing ring is recessed with a first annular groove, the width of which is greater than the width of the annular gap, and the first annular groove covers the annular gap. A bottom sealing plate is used to support the sealing ring and is welded and fixed to the bottom of the top cover plate to press the sealing ring tightly onto the pole post.

[0006] Preferably, an anti-rotation structure is provided between the upper plastic and the top cover sheet. The anti-rotation structure includes a first recessed hole on the outer side of the ring edge, a second recessed hole on the stop portion, a first protrusion on the inner side of the first retaining ring, and a second protrusion on the second retaining ring. The first recessed hole and the first protrusion are engaged in a locking fit, and the second recessed hole and the second protrusion are engaged in a locking fit.

[0007] Preferably, the ring edge is configured as a stepped ring edge, the stepped ring edge including a first stepped layer connected to the top cover plate and a second stepped layer having the stop portion formed thereon; the cross section of the first stepped layer is arc-shaped, and the first concave hole is provided on the first stepped layer.

[0008] Preferably, the sealing ring includes an inner ring and an outer ring arranged concentrically, the first annular groove is located between the inner ring and the outer ring, and the inner sidewall of the inner ring is provided with a plurality of positioning parts arranged around the periphery. When the sealing ring is fitted onto the pole post, each of the positioning parts abuts against the outer sidewall of the pole post.

[0009] Preferably, the positioning part is configured as an arc-shaped protrusion structure.

[0010] Preferably, the bottom of the first annular groove is provided with a plurality of weight-reducing through holes, and each of the weight-reducing through holes is evenly distributed along the circumference of the first annular groove.

[0011] Preferably, the lower end face of the sealing ring is recessed with a second annular groove, and the second annular groove is correspondingly provided with the first annular groove.

[0012] Preferably, the top cover plate has a receiving groove below the through hole corresponding to the position of the bottom sealing plate, and the bottom sealing plate is welded and fixed in the receiving groove so that the bottom sealing plate is flush with the bottom surface of the top cover plate.

[0013] Preferably, it also includes a lower plastic sheet, wherein the bottom of the top cover sheet is provided with a plurality of accumulation holes, and the lower plastic sheet is provided with a plurality of injection holes corresponding to each accumulation hole, so that hot melt adhesive passes through the injection holes and enters the accumulation holes, and after cooling, the top cover sheet and the lower plastic sheet are fixedly connected.

[0014] Preferably, a stop ring is formed on the outer peripheral wall of the pole post, and the upper and lower end faces of the stop ring act on the stop portion and the sealing ring respectively to limit the axial displacement of the pole post in the through hole.

[0015] As can be seen from the above description of this utility model, compared with the prior art, this utility model has the following beneficial effects:

[0016] (1) This utility model provides a battery top cover assembly with strong sealing performance. It has a simple structure, strong sealing performance, is easy to implement and has low cost, which solves the problem of poor sealing performance caused by injection molding of existing battery cover plates. In the technical solution of this utility model, the pole is pre-positioned in the through hole by the positioning fixture, and then the upper plastic is directly injection molded. The upper plastic limits and fixes the pole in the through hole of the top cover plate. Finally, the sealing ring and the bottom sealing plate are fixed and installed. By adopting the above-mentioned different method of first injection molding and fixing the pole and then installing the sealing components, it effectively prevents the injection molding from leaking and seeping into the area of ​​the installed sealing ring and bottom sealing plate, ensuring that there is no residue of injection molding, improving the product's aesthetics, sealing performance and assembly accuracy, and avoiding the risk of battery leakage. Secondly, the first annular groove covers the annular gap and has a larger groove width, blocking the battery liquid leakage channel, and combined with the pressing effect of the bottom sealing plate, it achieves a strong sealing effect.

[0017] (2) In this technical solution, the anti-rotation structure precisely restricts the rotation of the upper plastic relative to the top cover plate through the interlocking of the first concave hole and the first protrusion, and the second concave hole and the second protrusion, so as to avoid the pole post from circumferential displacement or loosening due to the rotation of the upper plastic, further ensuring the reliability of the pole post fixation and indirectly strengthening the stability of the sealing structure.

[0018] (3) In this technical solution, the first step layer of the ring edge is arc-shaped, which can reduce the stress concentration during the injection of the upper plastic, avoid cracks in the ring edge or the upper plastic, and enhance the molding quality of the upper plastic and the bonding strength with the top cover. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the battery cover plate according to an embodiment of the present utility model;

[0021] Figure 2 This is a cross-sectional schematic diagram of the battery cover plate according to an embodiment of the present utility model;

[0022] Figure 3 This is an exploded view of the battery cover plate according to an embodiment of the present invention;

[0023] Figure 4 This is an exploded cross-sectional view of the battery cover plate according to an embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of the sealing ring structure in an embodiment of the present invention;

[0025] Figure 6 This is a cross-sectional view of the plastic in an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of the other side of the plastic in an embodiment of this utility model.

[0027] Figure 8 This is a cross-sectional view of the plastic and the top cover sheet being heat-fused and fixed in an embodiment of this utility model;

[0028] Figure 9 for Figure 8 A magnified view of part A shown.

[0029] The annotations in the attached figures are explained as follows:

[0030] 1. Top cover plate; 11. Through hole; 12. Ring edge; 121. First stepped layer; 122. Second stepped layer; 13. Stop; 14. Accumulation hole; 15. Receiving groove;

[0031] 2. Pole post; 21. Retaining ring;

[0032] 3. Apply plastic; 31. First retaining ring; 32. Second retaining ring;

[0033] 4. Sealing ring; 41. First annular groove; 411. Weight reduction through hole; 42. Second annular groove; 43. Inner ring; 431. Positioning part; 44. Outer ring;

[0034] 5. Bottom sealing plate;

[0035] 61. First concave hole; 62. Second concave hole; 63. First protrusion; 64. Second protrusion;

[0036] 7. Lower plastic; 71. Injection hole; A. Annular gap. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0038] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0039] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does 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 limiting the specific protection scope of this utility model.

[0040] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0041] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0042] Please see Figures 1 to 9 .

[0043] This embodiment provides a battery top cover assembly with strong sealing performance. It features a simple structure, strong sealing, ease of implementation, and low cost, solving the problems of injection molding leakage and poor sealing in existing battery cover panels. The technical solution of this utility model mainly includes a top cover sheet 1, a terminal post 2, an upper plastic layer 3, a sealing ring 4, and a bottom sealing plate 5. Specific structural descriptions are as follows.

[0044] In this embodiment, see Figure 1 and Figure 2 The top cover plate 1 has through holes 11 on both its left and right sides for the positive and negative terminals 2 to pass through. The top cover plate 1 extends upwards along the height direction from the outer periphery of the through holes 11 to form a ring edge 12. The free end of the ring edge 12 is folded inwards towards the through holes 11 to form a stop portion 13. In this embodiment, see... Figure 2 and Figure 4 The ring edge 12 is a stepped ring edge 12, which includes a lower first stepped layer 121 and an upper second stepped layer 122. The cross section of the first stepped layer 121 is arc transitioned and integrally formed with the top cover plate 1. The second stepped layer 122 forms a stop part 13, which is mainly a folded edge, used to stop the pole post 2 from moving upward.

[0045] In this embodiment, the pole piece 2 is pre-positioned in the through hole 11 mainly by a positioning fixture (not shown). An annular gap A is formed between its outer wall and the inner wall of the through hole 11. The annular gap A includes the gap between the ring edge 12 and the pole piece 2. In the specific manufacturing process, after the top cover plate 1 is positioned and clamped by the external fixture (not shown), the positioning hole on the top surface of the pole piece 2 and the bottom surface of the pole piece 2 are clamped by the external fixture to completely position and clamp the pole piece 2 in the through hole 11 of the top cover plate 1. Then, the upper plastic 3 can be injection molded in the ring edge 12 and the annular gap A by injection molding. The upper plastic 3 is tightly attached to the pole piece 2, the ring edge 12 and the stop part 13, and the upper plastic 3 limits and fixes the pole piece 2 in the through hole 11. Therefore, the pole post 2 in this embodiment is different from the traditional top cover assembly which first installs the sealing ring 4 and bottom sealing plate 5 and then injects the plastic 3. This embodiment adopts the method of injection molding first and then sealing, which effectively prevents the injection molding glue from leaking and seeping into the area of ​​the installed sealing ring 4 and bottom sealing plate 5, and ensures that the injection molding glue will not remain on the sealing ring 4 and bottom sealing plate 5.

[0046] In this embodiment, see Figure 2 and Figure 4 The upper plastic 3 includes an integrally formed first retaining ring 31 and a second retaining ring 32. The first retaining ring 31 covers and is engaged with the first stepped layer 121 on the outer side of the ring edge 12, while the second retaining ring 32 partially enters the annular gap A and engages with the stop portion 13. To ensure that there is no relative rotation between the upper plastic 3 and the top cover plate 1, an anti-rotation structure is provided between them; the anti-rotation structure includes a first recess 61 provided in the first stepped layer 121, a second recess 62 provided in the stop portion 13 of the second stepped layer 122, a first protrusion 63 correspondingly provided on the inner side of the first retaining ring 31, and a second protrusion 64 provided in the second retaining ring 32 (see Figure 6 and Figure 7 The first concave hole 61 engages with the first protrusion 63, and the second concave hole 62 engages with the second protrusion 64.

[0047] In this embodiment, see Figure 2 After the sealing ring 4 is injection molded from the upper plastic 3, it is then fitted under the pole post 2, and positioned below the upper plastic 3. See [link / reference]. Figure 4 and Figure 5 The sealing ring 4 includes an inner ring 43 and an outer ring 44 arranged concentrically. A first annular groove 41 is recessed on the upper surface of the sealing ring 4, and the inner ring 43 and outer ring 44 are located on the inner and outer sides of the first annular groove 41, respectively. See also... Figure 2The width of the first annular groove 41 is greater than the width of the annular gap A, so that the first annular groove 41 can completely cover the annular gap A after assembly. The inner wall of the inner ring 43 is provided with a plurality of positioning parts 431 arranged around the circumference. When the sealing ring 4 is fitted onto the pole post 2, each positioning part 431 abuts against the outer wall of the pole post 2 to achieve radial positioning and auxiliary sealing, effectively preventing the pole post 2 from displacing and shaking in the radial direction. Secondly, the positioning parts 431 on the inner wall of the inner ring 43 can also ensure the concentricity and tightness of the sealing ring 4 and the pole post 2.

[0048] In this embodiment, the positioning part 431 is preferably a circular arc protrusion structure. The circular arc protrusion structure can provide effective positioning and sealing pressure while reducing friction and wear with the outer wall of the pole post 2, which facilitates assembly and protects the surface of the pole post 2.

[0049] In this embodiment, see Figure 5 The bottom of the first annular groove 41 is recessed with several weight-reducing through holes 411. These weight-reducing through holes 411 are evenly distributed circumferentially along the first annular groove 41. While ensuring the structural strength and sealing function of the sealing ring 4, this achieves material savings and product lightweighting, reducing manufacturing costs. Furthermore, see... Figure 2 The lower end face of the sealing ring 4 is also recessed with a second annular groove 42. The second annular groove 42 is arranged vertically and vertically corresponding to the first annular groove 41. In this way, the design of the second annular groove 42 increases the elastic deformation space of the sealing ring 4 under pressure, and also further realizes the lightweight design and reduces manufacturing costs.

[0050] In this embodiment, the bottom sealing plate 5 is used to support the sealing ring 4. The top cover plate 1 has a receiving groove 15 located below the through hole 11 corresponding to the position of the bottom sealing plate 5. The bottom sealing plate 5 is welded and fixed within this receiving groove 15, ensuring that the bottom sealing plate 5 is flush with the bottom surface of the top cover plate 1 after installation, resulting in a flatter and more stable structure. By welding and fixing the bottom sealing plate 5, the sealing ring 4 is pressed tightly onto the pole post 2, forming a reliable seal. The stop ring 21 formed on the outer peripheral wall of the pole post 2 has its upper and lower end faces acting on the stop portion 13 and the sealing ring 4 respectively, thereby limiting the axial displacement of the pole post 2 within the through hole 11.

[0051] In this embodiment, see Figure 8 and Figure 9 The system also includes a lower plastic sheet 7. The bottom of the top cover sheet 1 has several accumulation holes 14, and the lower plastic sheet 7 has several injection holes 71 corresponding to each accumulation hole 14. This allows hot melt adhesive to pass through the injection holes 71 and enter the accumulation holes 14. After the hot melt adhesive cools, it securely connects the top cover sheet 1 to the lower plastic sheet 7. The lower plastic sheet 7 is connected to the top cover sheet 1 by injecting hot melt adhesive into the injection holes 71 and filling the accumulation holes 14, forming a strong physical anchor point connection. This connection method is simple and reliable, with high structural stability, and makes it less likely for the top cover sheet 1 and the lower plastic sheet 7 to detach.

[0052] In this embodiment, the stop ring 21 on the pole post 2 is restricted between the stop portion 13 and the sealing ring 4, providing a clear axial positioning reference for the pole post 2, preventing the pole post 2 from moving up and down in the through hole 11, and ensuring the stability of the pole post connection.

[0053] The working principle and usage process of this utility model:

[0054] First, after the top cover plate 1 is positioned and clamped by an external clamp (not shown), the positioning clamp holds the pre-set process positioning hole at the top of the pole post 2 and supports the lower end face of the pole post 2, so as to achieve concentric pre-positioning of the pole post 2 and the through hole 11.

[0055] Second, the upper plastic 3 is injection molded into the annular gap A between the ring edge 12 and the annular edge 12 using an injection molding machine. The first retaining ring 31 and the second retaining ring 32 of the upper plastic 3 then cover the annular edge 12 of the top cover plate 1. Each first protrusion 63 of the first retaining ring 31 engages with a corresponding first recess 61 on the outer periphery of the first stepped layer 121, and each second protrusion 64 of the second retaining ring 32 engages with a corresponding second recess 62 in the stop portion 13 of the second stepped layer 122. This achieves a locking anti-rotation fit, effectively preventing relative rotation and thus independently and securely fixing the pole post 2. This process is performed before the sealing components are installed, completely eliminating the risk of leakage due to injection pressure.

[0056] Third, the sealing ring 4 is installed, and its wide first annular groove 41 completely covers the annular gap A. That is, the annular gap A corresponds to the first annular groove 41 between the inner ring 43 and the outer ring 44 of the sealing ring 4. In this way, the battery fluid cannot enter the annular gap A from the direction of the inner ring 43 or the direction of the outer ring 44, and the channel to enter the annular gap A is completely blocked. Secondly, the positioning part 431 surrounding the inner ring 43 also fits tightly with the outer wall of the pole post 2, ensuring the concentricity between the sealing ring 4 and the pole post 2.

[0057] Fourth, the bottom sealing plate 5 is welded into the receiving groove 15 below the top cover plate 1. The bottom sealing plate 5 presses the sealing ring 4 under the pole post 2. In this way, the lower end face of the stop ring 21 on the outer peripheral wall of the pole post 2 acts on the upper part of the inner ring 43 of the sealing ring 4, and the upper end face acts on the second retaining ring 32 (since the second retaining ring 32 covers the stop part 13 of the ring edge 12, the stop ring 21 will indirectly act on the stop part 13) to limit the axial displacement of the pole post 2 in the through hole 11.

[0058] Fifth, the lower plastic 7 is connected to the top cover plate 1 by injecting hot melt adhesive into the injection hole 71 and filling the accumulation hole 14, forming a firm physical anchor point connection, thus fixing the lower plastic 7 to the top cover plate 1. Therefore, in this utility model, the electrode post 2 is pre-positioned in the through hole 11 by a positioning fixture, and then the upper plastic 3 is directly injection molded. The upper plastic 3 limits and fixes the electrode post 2 in the through hole 11 of the top cover plate 1, and finally the sealing ring 4 and the bottom sealing plate 5 are fixed and installed. By adopting the above-mentioned different method of first injection molding and fixing the electrode post 2 and then installing the sealing components, it is effective to prevent injection molding leakage from seeping into the area of ​​the already installed sealing ring 4 and bottom sealing plate 5, ensuring that there is no injection molding residue, improving the product's aesthetics, sealing performance and assembly accuracy, and avoiding the risk of battery leakage. Secondly, the first annular groove 41 covers the annular gap A and has a larger groove width, blocking the battery fluid leakage channel, and combined with the pressing effect of the bottom sealing plate 5, it achieves a strong sealing effect.

[0059] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A battery top cover assembly with strong sealing performance, characterized in that: include The top cover plate has a through hole for the pole post to pass through. The outer peripheral edge of the through hole extends along the height direction to form a ring edge. The upper free end of the ring edge is folded towards the inside of the through hole to form a stop portion. The electrode post is pre-positioned in the through hole by a positioning fixture, and an annular gap is formed between the electrode post and the inner wall of the through hole. The upper plastic is injection molded into the annular edge and the annular gap, and is tightly fitted with the pole, the annular edge and the stop part to limit and fix the pole in the through hole; the upper plastic includes an integrally formed first retaining ring and a second retaining ring, the first retaining ring is engaged on the outside of the annular edge, and the second retaining ring is engaged with the stop part and partially enters the annular gap; A sealing ring, which is used to be fitted under the pole post after the upper plastic is molded, and is located below the upper plastic; The upper end face of the sealing ring is recessed with a first annular groove, the width of the first annular groove is greater than the width of the annular gap, and the first annular groove covers the annular gap. A bottom sealing plate is used to support the sealing ring and is welded and fixed to the bottom of the top cover plate to press the sealing ring tightly onto the pole.

2. The battery top cover assembly with strong sealing performance as described in claim 1, characterized in that: An anti-rotation structure is provided between the upper plastic and the top cover plate. The anti-rotation structure includes a first concave hole on the outer side of the ring edge, a second concave hole on the stop portion, a first protrusion on the inner side of the first retaining ring, and a second protrusion on the second retaining ring. The first concave hole and the first protrusion are engaged in a locking fit, and the second concave hole and the second protrusion are engaged in a locking fit.

3. The battery top cover assembly with strong sealing performance as described in claim 2, characterized in that: The ring edge is configured as a stepped ring edge, which includes a first stepped layer connected to the top cover plate and a second stepped layer having the stop portion formed thereon; the cross-section of the first stepped layer is arc-shaped, and the first concave hole is provided on the first stepped layer.

4. The battery top cover assembly with strong sealing performance as described in claim 1, characterized in that: The sealing ring includes an inner ring and an outer ring arranged concentrically. The first annular groove is located between the inner ring and the outer ring. The inner sidewall of the inner ring is provided with a plurality of positioning parts arranged around the periphery. When the sealing ring is fitted onto the pole post, each of the positioning parts abuts against the outer sidewall of the pole post.

5. A battery top cover assembly with strong sealing performance as described in claim 4, characterized in that: The positioning part is configured as an arc-shaped protrusion structure.

6. A battery top cover assembly with strong sealing performance as described in claim 4, characterized in that: The bottom of the first annular groove is provided with a plurality of weight-reducing through holes, and each of the weight-reducing through holes is evenly distributed along the circumference of the first annular groove.

7. A battery top cover assembly with strong sealing performance as described in claim 1, characterized in that: The lower end face of the sealing ring is recessed with a second annular groove, which is corresponding to the first annular groove.

8. A battery top cover assembly with strong sealing performance as described in claim 1, characterized in that: The top cover plate has a receiving groove below the through hole corresponding to the position of the bottom sealing plate. The bottom sealing plate is welded and fixed in the receiving groove so that the bottom sealing plate is flush with the bottom surface of the top cover plate.

9. A battery top cover assembly with strong sealing performance as described in claim 1, characterized in that: It also includes a lower plastic sheet, the bottom of which is provided with a number of accumulation holes, and the lower plastic sheet is provided with a number of injection holes corresponding to each of the accumulation holes, so that hot melt adhesive can pass through the injection holes and enter the accumulation holes, and after cooling, the top cover sheet and the lower plastic sheet are fixedly connected.

10. A battery top cover assembly with strong sealing performance as described in any one of claims 1-9, characterized in that: A stop ring is formed on the outer peripheral wall of the pole post. The upper and lower end faces of the stop ring act on the stop portion and the sealing ring, respectively, to limit the axial displacement of the pole post in the through hole.

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