Top cover assembly and battery

Abstract

The utility model discloses a top cover assembly and a battery, and relates to the technical field of power batteries. The top cover assembly comprises a cover plate, a pole, a sealing ring and upper plastic, a first through hole penetrating through the cover plate is formed in the cover plate, a bulge is annularly arranged on the cover plate in the circumferential direction of the first through hole, and an extension part extending inwards is arranged on the inner wall of the bulge; the pole is arranged in the first through hole in a penetrating manner; at least one of a first annular table and a second annular table which are formed after pressing riveting is arranged on the side wall of the pole; the sealing ring is arranged on the second annular table in a sleeving mode and abuts against the inner wall of the first through hole and the extending part; the upper plastic cement is annular, the upper plastic cement is arranged on the pole in a sleeving mode and wraps the protrusion, the upper plastic cement is provided with a filling part partially stretching into the position between the first through hole and the pole, the filling part is located between the first annular table and the second annular table, and the first annular table abuts against the upper portion of the filling part. The top cover assembly solves the technical problem that a sealing ring in an existing top cover assembly is prone to failure.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of power battery, especially top cover subassembly and battery. BACKGROUND

[0002] The top cover subassembly of the existing power battery is provided with a sealing ring on the cover plate, and then the pole post is installed and fixed after riveting, and the structure design of each element in the top cover subassembly is only a simple contact relationship, which leads to the technical problem that the sealing ring is prone to failure after long-term use. UTILITY MODEL CONTENTS

[0003] Therefore, the utility model provides a top cover subassembly and battery, which solves the technical problem that the sealing ring in the existing top cover subassembly is prone to failure.

[0004] In order to solve the above technical problem, the utility model adopts the following technical scheme:

[0005] A top cover subassembly, the top cover subassembly comprises:

[0006] A cover plate, a first through hole penetrating through the cover plate is formed in the cover plate, a protrusion is arranged around the first through hole in the circumferential direction of the first through hole, and an extension extending inward is arranged on the inner wall of the protrusion;

[0007] A pole post, the pole post is arranged in the first through hole, and at least one of a first annular table and a second annular table formed after riveting is arranged on the side wall of the pole post;

[0008] A sealing ring, the sealing ring is sleeved on the second annular table and abuts against the inner wall of the first through hole and the extension;

[0009] An upper plastic, the upper plastic is annular, the upper plastic is sleeved on the pole post and wrapped on the protrusion, has a filling part extending into the first through hole and the pole post, the filling part is located between the first annular table and the second annular table, and the first annular table abuts above the filling part.

[0010] In some embodiments of the top cover subassembly, a groove is further formed in the cover plate, the groove is arranged around the protrusion in the circumferential direction, and the upper plastic partially extends into the groove.

[0011] In some embodiments of the top cover subassembly, the distance between the groove bottom surface of the groove and the lower surface of the extension is less than the thickness of the sealing ring.

[0012] In some embodiments of the top cover subassembly, the inner wall surface of the protrusion is flush with the inner wall surface of the first through hole.

[0013] In some embodiments of the top cover assembly, the first annular platform is circumferentially annularly arranged along the pole post.

[0014] In some embodiments of the top cover assembly, an outer diameter of the second annular platform is greater than an inner diameter of the extension.

[0015] In some embodiments of the top cover assembly, the top cover assembly further comprises a lower plastic connected to a side of the cover plate away from the upper plastic, and a second through hole is formed in the lower plastic to pass through the lower plastic for the pole post to pass through.

[0016] In some embodiments of the top cover assembly, one of the lower plastic and the pole post is provided with a clamping groove, and the other is provided with a buckle matched with the clamping groove, so that the lower plastic is connected with the cover plate through clamping with the pole post.

[0017] In some embodiments of the top cover assembly, a fixing ring is welded on the first annular platform, the fixing ring is located between the first annular platform and the upper plastic, and the fixing ring abuts against the filling portion.

[0018] To solve the above technical problems, the technical scheme two of the utility model is:

[0019] A battery comprising the top cover assembly in the above embodiments, the battery further comprising a shell and a cell, the top cover assembly is installed at an opening portion of the shell, and the cell is accommodated in an enclosed space surrounded by the top cover assembly and the shell.

[0020] The utility model embodiment is implemented, and at least the following beneficial effects are achieved:

[0021] The top cover assembly is applied to the battery, and the top cover assembly and the battery have the technical effect that the sealing ring is not prone to failure. Specifically, the upper plastic is wrapped on the protrusion, and the sealing ring abuts against the inner wall of the first through hole and the extension of the protrusion. In the process of pressure riveting the pole post to form the first annular platform and / or the second step, the pressure is transmitted from top to bottom or from bottom to top among the upper plastic, the protrusion and the sealing ring, and the sealing ring is compressed by mutual extrusion. The transmission of the force finally enables the pole post to be compressed by the turning strength of the pole post itself, so that the sealing ring is compressed. The long-term use of the battery can be guaranteed to avoid the failure of the sealing ring, and the technical problem that the sealing ring is prone to failure in the existing top cover assembly is solved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0023] Figure 1 It is a structural schematic view of the top cover assembly in one embodiment.

[0024] Figure 2 It is a top view of the top cover assembly. Figure 1

[0025] Figure 3 It is a structural schematic view of A-A part in the embodiment. Figure 2

[0026] Figure 4 It is a top view of the top cover assembly in one embodiment.

[0027] Figure 5 It is a top view of the top cover assembly. Figure 4

[0028] Among them:

[0029] 1, cover plate; 11, first through hole; 12, protrusion; 121, extension; 13, groove;

[0030] 2, pole; 21, first annular table; 22, second annular table;

[0031] 3, sealing ring;

[0032] 4, upper plastic; 41, filling part;

[0033] 5, lower plastic; 51, second through hole;

[0034] 6, fixing ring. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many other different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0036] ​​​It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] like Figures 1-3 As shown, in one embodiment of the top cover assembly, the top cover assembly includes a cover plate 1, a pole post 2, a sealing ring 3, and an upper plastic 4. The cover plate 1 has a first through hole 11 penetrating the cover plate 1. A protrusion 12 is circumferentially arranged along the first through hole 11 on the cover plate 1. The inner wall of the protrusion 12 has an inwardly extending extension 121. The pole post 2 passes through the first through hole 11. At least one of the pole post 2's sidewalls is a first annular platform 21 and a second annular platform 22, formed by riveting. The sealing ring 3 is fitted onto the second annular platform 22 and abuts against the inner wall of the first through hole 11 and the extension 121. The upper plastic 4 is annular, fitted onto the pole post 2 and wrapped around the protrusion 12, and has a filling portion 41 that partially extends into the space between the first through hole 11 and the pole post 2. The filling portion 41 is located between the first annular platform 21 and the second annular platform 22.

[0039] In this embodiment, by wrapping the upper plastic 4 around the protrusion 12 and making the sealing ring 3 abut against the inner wall of the first through hole 11 and the extension 121 of the protrusion 12, during the process of forming the first annular platform 21 by pressing the pole post 2, the pressure is transmitted from top to bottom among the upper plastic 4, the protrusion 12 and the sealing ring 3, and they squeeze each other, so that the sealing ring 3 is compressed. The transmission of force layer by layer ultimately makes the pole post 2's own flipping strength during pressing achieve the effect of compressing the sealing ring 3, which can ensure that the sealing ring 3 does not fail during long-term use and solves the technical problem that the sealing ring 3 is prone to failure in the existing top cover assembly.

[0040] In one embodiment of the top cover assembly, the cover plate 1 is further provided with a groove 13, which is arranged around the circumference of the protrusion 12, and the upper plastic part 4 extends into the groove 13.

[0041] In this embodiment, the groove 13 is provided to position the plastic 4.

[0042] Specifically, the upper plastic 4 can be a U-shaped structure, which is buckled on the protrusion 12, so as to form a wrapping effect of the protrusion 12, and by extending into the groove 13, the upper plastic 4 can be conveniently butted with the top cover by the staff or the device.

[0043] In an embodiment of the top cover assembly, the distance between the bottom surface of the groove 13 and the lower surface of the extension 121 is less than the thickness of the sealing ring 3.

[0044] In the embodiment, the distance between the bottom surface of the groove 13 and the lower surface of the extension 121 is small, so that the sealing ring 3 can be better and more tightly compressed during the subsequent compression of the pole 2, and the compressed sealing ring 3 can be expanded and filled to achieve a better sealing effect.

[0045] In an embodiment of the top cover assembly, the inner wall surface of the protrusion 12 is flush with the inner wall surface of the first through hole 11.

[0046] In the embodiment, the protrusion 12 can be injection molded in this way, which is simple and integrated, and the protrusion 12 can be formed by first turning up the inner wall of the first through hole 11 towards the top and then turning it inwards, i.e. bending twice, so as to form a rounded transition. It can be understood that the inwardly turned edge forms the extension 121, which is formed in a simple and flat manner, and the part of the protrusion 12 can also extend the axial inner wall of the first through hole 11, so that the sealing ring 3 can abut against the side wall of the part of the protrusion 12, thereby achieving a better sealing effect.

[0047] In an embodiment of the top cover assembly, the first annular table 21 is arranged in a ring around the pole 2.

[0048] In the embodiment, by arranging the first annular table 21 in a ring, the shape of the sealing ring 3 can be better matched, so that the forces on different parts of the sealing ring 3 are balanced.

[0049] Specifically, the first annular table 21 can be formed by forming a ring-shaped edge at the end of the pole 2 and then compression riveting.

[0050] In an embodiment of the top cover assembly, the outer diameter of the second annular table 22 is greater than the inner diameter of the extension 121.

[0051] In the embodiment, the second annular table 22 has a large diameter, which can avoid the pole 2 from passing through and facilitate the installation of the sealing ring 3, so that the sealing ring 3 can abut against the extension 121, and in addition, the first annular table 21 and the second annular table 22 form a clamping, which can prevent the pole 2 from being separated from the cover plate 1, thereby achieving a fixed effect.

[0052] In an embodiment of the top cover assembly, the top cover assembly further comprises a lower plastic 5 connected to the side of the cover plate 1 away from the upper plastic 4, and the lower plastic 5 is provided with a second through hole 51 penetrating the lower plastic 5 to allow the pole 2 to pass through.

[0053] In the embodiment, the lower plastic 5 cooperates with the sealing ring 3 and the upper plastic 4 to further avoid discharge arc between the pole 2 and the cover plate 1, and also supports the cover plate 1.

[0054] In an embodiment of the top cover assembly, one of the lower plastic 5 and the pole 2 is provided with a clamping groove, and the other is provided with a clamping buckle matched with the clamping groove, so that the lower plastic 5 is connected with the cover plate 1 through clamping with the pole 2.

[0055] In the embodiment, when the lower plastic 5 is clamped with the pole 2, and then assembled with the battery cell, whether the tab is welded with the connecting piece first or the connecting piece is welded with the pole 2 first, the connecting piece is welded with the pole 2, which further limits and fixes the lower plastic 5, and meets the tensile force requirement.

[0056] In an embodiment of the top cover assembly, as shown in Figures 4-5 , the first annular table 21 is welded with a fixing ring 6, the fixing ring 6 is located between the first annular table 21 and the upper plastic 4, and the fixing ring 6 abuts against the filling part 41.

[0057] In the embodiment, the first annular table 21 can extend the diameter by welding the fixing ring 6, and the filling part 41 is abutted by the fixing ring 6, so that when the second annular table 22 is riveted, the effect of clamping and compressing the sealing ring 3 can be achieved. In addition, the fixing ring 6 is welded with the pole 2 to fix the pole 2. It should be noted that the first annular table 21 can not need to be formed by riveting the flange, that is, the first annular table 21 can be formed together with the pole 2, and the fixing of the pole 2 is achieved by welding with the fixing ring 6. Of course, the fixing ring 6 can be installed and welded after the first annular table 21 is formed by riveting, and the pole 2 is further fixed after the sealing ring 3 is compressed.

[0058] In combination with the previous embodiments, the first annular table 21 can be formed by riveting the annular flange at the upper end surface edge of the pole 2, and the upper surface of the formed first annular table 21 can be flat with the upper surface of the main body of the pole 2, or lower than the upper surface of the main body of the pole 2.

[0059] In addition, in combination with Figure 3 and Figure 5 , it should be noted that the side wall of the pole 2 can not be a cylindrical with the same diameter, but can be different in diameter from top to bottom, for example Figure 5The upper diameter is smaller than the lower diameter, but the annular platform can still be formed.

[0060] The utility model also relates to a battery, apply the top cover subassembly in preceding embodiment, the battery still includes shell and electric core, top cover subassembly installs in the opening part of shell, and the electric core is accomodated in the enclosed space surrounded by top cover subassembly and shell.

[0061] In the embodiment, by applying the top cover subassembly in the preceding embodiment, the failure of the sealing ring 3 in long-term use can be avoided, thereby reducing the maintenance of the battery.

[0062] The technical features of the above embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0063] The above embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it should not be understood as the limitation of the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A top cover assembly, characterized in that, The top cover assembly includes: A cover plate, wherein a first through hole is provided through the cover plate, and a protrusion is provided on the cover plate circumferentially along the first through hole, and an inwardly extending extension is provided on the inner wall of the protrusion; The pole post is inserted through the first through hole, and the side wall of the pole post is provided with at least one of the first annular platform and the second annular platform formed after press riveting. A sealing ring, which is fitted onto the second annular platform and abuts against the inner wall of the first through hole and the extension; The upper plastic is annular and is sleeved on the pole post and wrapped around the protrusion. It has a filling portion that extends into the space between the first through hole and the pole post. The filling portion is located between the first annular platform and the second annular platform, and the first annular platform abuts against the filling portion.

2. The top cover assembly as claimed in claim 1, characterized in that, The cover plate is also provided with a groove, which is arranged around the circumference of the protrusion, and the upper plastic part extends into the groove.

3. The top cover assembly as described in claim 2, characterized in that, The distance between the bottom surface of the groove and the lower surface of the extension is less than the thickness of the sealing ring.

4. The top cover assembly as claimed in claim 1, characterized in that, The raised inner wall surface is flush with the inner wall surface of the first through hole.

5. The top cover assembly as claimed in claim 1, characterized in that, The first annular platform is arranged circumferentially around the pole post.

6. The top cover assembly as claimed in claim 5, characterized in that, The outer diameter of the second annular platform is larger than the inner diameter of the extension.

7. The top cover assembly as claimed in claim 1, characterized in that, The top cover assembly also includes a lower plastic piece, which is connected to the side of the cover plate opposite to the upper plastic piece. The lower plastic piece has a second through hole that passes through it, allowing the pole post to pass through.

8. The top cover assembly as claimed in claim 7, characterized in that, One of the lower plastic and the electrode post is provided with a slot, and the other is provided with a buckle that cooperates with the slot, so that the lower plastic is connected to the cover plate by engaging with the electrode post.

9. The top cover assembly as claimed in claim 1, characterized in that, A fixing ring is welded to the first annular platform. The fixing ring is located between the first annular platform and the upper plastic and abuts against the filling part.

10. A battery, characterized in that, The battery includes a top cover assembly as described in any one of claims 1-9, and further includes a housing and a battery cell, wherein the top cover assembly is mounted on an opening in the housing, and the battery cell is housed within a closed space enclosed by the top cover assembly and the housing.

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