CN215184433U

CN215184433U - Battery top cap and battery

Info

Publication number: CN215184433U
Application number: CN202120784023.1U
Authority: CN
Inventors: 王先文; 吕正中; 苑丁丁
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2021-04-16
Filing date: 2021-04-16
Publication date: 2021-12-14
Anticipated expiration: 2031-04-16

Abstract

The utility model relates to a battery top cap and battery, this battery top cap includes the apron, pressing plates, insulating assemblies and utmost point post, the apron is provided with the mounting hole that runs through its thickness direction's both sides face, utmost point post wears to locate in the mounting hole and with the apron interval, utmost point post includes utmost point post body, the first mounting groove that is used for the erection joint spare is offered at the middle part of the first end of utmost point post body, the week portion of the first end of utmost point post body is provided with first flange, the free end orientation of first flange extends towards the direction that deviates from the axis of mounting hole, the one end that utmost point post body deviates from first flange is located to the clamp plate cover, all be provided with insulating assemblies between clamp plate and the apron and between first flange and the apron, and make apron and insulating assemblies press from both sides tightly between clamp plate and first flange. The battery top cover has the characteristics of simple structure, high production efficiency and low manufacturing cost.

Description

Battery top cap and battery

Technical Field

The utility model relates to a battery technology field especially relates to a battery top cap and including battery of this battery top cap.

Background

With the development of new energy, the market demand of lithium ion batteries is increasing. At present, the top cover of the battery is manufactured by processes of pole encapsulation injection molding, riveting and the like in the battery industry. For example, in a relatively common top cover manufacturing process, a plurality of parts for fixing the pole and insulating the isolation pole need to be assembled and welded with the cover plate, and finally, the pole and the parts are protected by encapsulation and injection molding. This top cap part is more, and the structure is complicated, and assembly process is loaded down with trivial details, is unfavorable for improving battery preparation efficiency.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery top cap and battery, its simple structure, production efficiency are high, low in manufacturing cost.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a battery top cover, includes apron, clamp plate, insulating assembly and utmost point post, the apron is provided with the mounting hole that runs through its thickness direction's both sides face, utmost point post wears to locate in the mounting hole and with the apron interval, utmost point post includes utmost point post body, the first mounting groove that is used for erection joint spare is offered at the middle part of the first end of utmost point post body, the week portion of the first end of utmost point post body is provided with first flange, the free end orientation of first flange deviates from the direction of the axis of mounting hole extends, the clamp plate cover is located utmost point post body deviates from the one end of first flange, the clamp plate with between the apron and first flange with all be provided with between the apron insulating assembly, and make the apron with insulating assembly presss from both sides tightly and is in the clamp plate with between the first flange.

Further, the insulating assembly comprises an insulating part and a sealing ring with elasticity, the insulating part is located on one side close to the pressing plate, and the sealing ring is located on one side close to the first flange.

Further, the insulating part is ring structure, the insulating part includes first insulating plate, and set up in the second insulation board of the outer ring side of first insulating plate with set up in the third insulation board of the inner ring side of first insulating plate, first insulating plate is located the clamp plate with between the apron, the third insulation board is located utmost point post body with between the pore wall of mounting hole, the second insulation board with form between the utmost point post body and be used for holding the second mounting groove of clamp plate.

Furthermore, one of the first insulating plate and the cover plate is provided with a positioning column, the other one of the first insulating plate and the cover plate is provided with a positioning groove matched with the positioning column, and the positioning column is spliced with the positioning groove.

Furthermore, along the circumferencial direction of first insulating plate, a side that first insulating plate is close to the apron is provided with a plurality ofly the reference column.

Further, the sealing washer is including being first sealing and the second sealing that the contained angle set up, first sealing is located first flange with between the apron, the second sealing is located utmost point post body with between the pore wall of mounting hole, just the second sealing can with the insulating part butt.

Furthermore, a first step surface is concavely arranged on one side surface of the cover plate close to the battery core, and the sealing ring is abutted against the first step surface; and/or, a second step surface is concavely arranged on one side surface of the cover plate, which deviates from the battery cell, and the insulating part is abutted to the second step surface.

Further, the utmost point post has two, two utmost point post is anodal post and negative pole post respectively, the insulating part has two, two the insulating part is anodal insulating part and negative pole insulating part respectively, anodal insulating part with the anodal post corresponds the setting, the negative pole insulating part with the negative pole post corresponds the setting, the embedded electrically conductive particle that is equipped with of anodal insulating part.

Further, the insulating part is formed by injection molding.

Further, still include insulating support, insulating support set up in the apron is close to a side of electric core, insulating support be provided with the hole of dodging of mounting hole intercommunication, the pore wall of dodging the hole is provided with the second flange, the free end orientation of second flange the axis direction of dodging the hole extends, and makes the second flange clamp is located first flange with between the apron.

Further, the pole body and the first flange are integrally formed.

Still provide a battery, including foretell battery top cap, still include electric core and connecting piece, the one end of connecting piece with the utmost point ear of electric core is connected, the other end of connecting piece with the tank bottom of first mounting groove is connected, so that utmost point post with electric core passes through connecting piece electric connection.

The utility model discloses compare in prior art's beneficial effect:

the utility model discloses a battery top cap and battery sets up first mounting groove through the middle part at the first end of utmost point post, sets up first flange in week portion of the first end of utmost point post, and the second end of utmost point post sets up the clamp plate to make apron and insulating assemblies tightly pressed from both sides between clamp plate and first flange, the realization is fixed to the installation of utmost point post, is favorable to reducing the part quantity of battery top cap, avoids carrying out the rubber coating to the battery top cap and moulds plastics, has simple structure, simplifies the characteristics that manufacturing process and cost are low. Meanwhile, a first mounting groove for mounting the connecting piece is formed in the middle of the first end of the pole, so that the connecting piece is welded in the first mounting groove, and the thermal influence on the insulating assembly on the periphery of the pole during welding is avoided. And, set up first mounting groove and be used for the erection joint spare at the first end of utmost point post, increased the installation space between utmost point post and the electric core.

Drawings

Fig. 1 is an exploded view of a battery top cover of an embodiment.

Fig. 2 is a cross-sectional view of a battery top cap of an embodiment.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Fig. 4 is a partial sectional view of a cover plate of the embodiment.

Fig. 5 is a schematic view of a pole of an embodiment.

FIG. 6 is a schematic view of an angle of an insulating member according to an embodiment.

FIG. 7 is a schematic view of another angle of the insulating member of the embodiment.

In the figure:

1. a cover plate; 10. mounting holes; 11. a first step surface; 12. a second step surface; 13. an explosion-proof hole; 14. a liquid injection hole; 2. pressing a plate; 3. an insulating member; 31. a first insulating plate; 32. a second insulating plate; 33. a third insulating plate; 34. a second mounting groove; 35. a positioning column; 4. a seal ring; 5. a pole column; 50. a pole body; 51. a first flange; 52. a first mounting groove; 6. an insulating support; 61. avoiding holes; 62. a second flange; 7. a connecting member; 8. and (4) a protective film.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner.

As shown in fig. 1 to 7, the utility model provides a pair of battery top cap installs on electric core, and electric core includes shell and core package, and the shell has the chamber that holds that is used for holding core package and electrolyte, and the core package is installed and is being held the intracavity, and the battery top cap is installed at the open position of shell to with core package and electrolyte sealing inside the shell. This battery top cap includes apron 1, clamp plate 2, insulating assembly and utmost point post 5, apron 1 is provided with the mounting hole 10 that runs through its thickness direction's both sides face, utmost point post 5 wears to locate in the mounting hole 10 and with apron 1 interval, utmost point post 5 includes utmost point post body 50, first mounting groove 52 that is used for erection joint spare 7 is offered at the middle part of the first end of utmost point post body 50, the week portion of the first end of utmost point post body 50 is provided with first flange 51, the free end orientation of first flange 51 deviates from the direction extension of the axis of

mounting hole

10, 2 covers of clamp plate establish with utmost point post body 50 the one end that deviates from first flange 51, between clamp plate 2 and the apron 1, and all be provided with insulating assembly between first flange 51 and apron 1, and make apron 1 and insulating assembly press from both sides tightly between clamp plate 2 and first flange 51. It can be understood that the battery top cover is used for sealing the shell of the battery core and installing the fixed pole 5, the pole 5 is used for connecting the battery core and external equipment, the pole 5 is connected with a pole lug on the battery core through a connecting piece 7, and the external power transmission equipment is connected with the pole 5, so that the electric energy transmission of the battery is realized. In this embodiment, the cover plate 1 is used to close the opening of the outer shell, so that a containing cavity for installing the core package and filling the electrolyte is formed between the outer shell and the cover plate 1. Meanwhile, the cover plate 1 is also used for installing the pole 5, and the electric connection with external equipment is realized through the pole 5. The number of the polar columns 5 is two, the two polar columns 5 are respectively a positive pole column and a negative pole column, and the positive pole column and the negative pole column are arranged at intervals along the length direction of the cover plate 1. Correspondingly, the number of the pressing plates 2 and the number of the insulating assemblies are two, and the two pressing plates 2 and the two insulating assemblies are respectively arranged corresponding to the two pole columns 5. The pressing plate 2 and the insulating assembly are used for fixing the pole 5 on the cover plate 1. Utmost point post 5 includes utmost point post body 50 and first flange 51, and utmost point post body 50 has relative first end and second end, and utmost point post body 50 first end is located the one side that is close to electric core, and utmost point post body 50 first end extends to the inside of battery and passes through connecting piece 7 with electric core to be connected, and utmost point post body 50 second end exposes in the outside of battery to make utmost point post body 50 second end be connected with external equipment. The middle part of the first end of the pole body 50 is provided with a first mounting groove 52, and the connecting piece 7 is welded and fixed with the groove bottom of the first mounting groove 52. The first flange 51 is disposed on a peripheral portion of the first end of the pole body 50, that is, the first flange 51 is disposed around a peripheral portion of the first mounting groove 52. The free end of the first flange 51 is the end of the first flange 51 facing away from the pole body 50, and the free end of the first flange 51 extends in a direction away from the axis of the mounting hole 10, so that the orthographic projection of the first flange 51 on the cover plate 1 is located on the cover plate 1. The pressing plate 2 is of an annular structure, the pressing plate 2 is sleeved on the periphery of the pole 5, and the pressing plate 2 is located at the second end of the pole body 50. The pressing plate 2 is fixed with the pole body 50 in a welding mode, and the orthographic projection of at least part of the pressing plate 2 on the cover plate 1 is located in the cover plate 1. First flange 51 is located apron 1 and is close to one side of electric core, and clamp plate 2 is located apron 1 and deviates from one side of electric core, and all be provided with insulating assembly between clamp plate 2 and the apron 1 to and between first flange 51 and the apron 1, insulating assembly's effect lies in keeping apart clamp plate 2 and apron 1, and keeps apart first flange 51 and apron 1. Meanwhile, the insulating assembly plays a role in sealing so that the pole 5 and the cover plate 1 are hermetically installed. The area of the cover plate 1 adjacent to the mounting hole 10 and the insulating assembly are clamped between the pressure plate 2 and the first flange 51, so that the pole 5 and the insulating assembly are mounted and fixed, and the structure has the advantages of small number of parts, simplification of the structure and reduction of cost. Meanwhile, compared with the existing encapsulation injection molding mode for fixing the pole 5, the method is beneficial to simplifying the process and improving the production efficiency.

Referring to fig. 3, the insulating assembly includes an insulating member 3 and a sealing ring 4 having elasticity, the insulating member 3 is located at a side close to the pressing plate 2, and the sealing ring 4 is located at a side close to the first flange 51. In this embodiment, insulating part 3 is injection moulding, and insulating part 3 is installed in the one side that apron 1 deviates from electric core, and insulating part 3 is located between clamp plate 2 and the apron 1, and between partial insulating part 3 extended to the pore wall of utmost point post 5 and mounting hole 10, plays the insulating guard action to clamp plate 2 and utmost point post 5. The sealing ring 4 is made of an elastic material with acid and alkali resistance and high temperature resistance, and the sealing ring 4 has elasticity so as to ensure the sealing property between the pole 5 and the cover plate 1. The sealing ring 4 is arranged on one side of the cover plate 1 close to the battery, the sealing ring 4 is arranged between the first flange 51 and the cover plate 1, and part of the sealing ring 4 extends to the space between the pole 5 and the hole wall of the mounting hole 10, so that the insulating protection and sealing effects on the first flange 51 and the pole 5 are achieved.

Specifically, referring to fig. 6 and 7, the insulating member 3 has an annular structure, and the inner ring side surface of the insulating member 3 abuts against the pole 5. The insulating part 3 comprises a first insulating plate 31, a second insulating plate 32 arranged on the outer ring side surface of the first insulating plate 31 and a third insulating plate 33 arranged on the inner ring side surface of the first insulating plate 31, the first insulating plate 31 is positioned between the pressing plate 2 and the cover plate 1, the third insulating plate 33 is positioned between the pole body 50 and the hole wall of the mounting hole 10, and a second mounting groove 34 for accommodating the pressing plate 2 is formed between the second insulating plate 32 and the pole body 50. In this embodiment, the cross-section of the insulating member 3 is "Z" shaped, the first insulating plate 31 is abutted against a side surface of the cover plate 1 departing from the battery cell, the second insulating plate 32 and the third insulating plate 33 are respectively extended toward the battery cell and away from the battery cell, and the second insulating plate 32 and the third insulating plate 33 are both perpendicular to the first insulating plate 31. Form second mounting groove 34 between second insulation board 32 and utmost point post body 50, clamp plate 2 is installed in second mounting groove 34, is favorable to carrying out insulation protection to clamp plate 2 through insulating part 3, avoids clamp plate 2 and apron 1 contact to cause the battery short circuit risk.

Specifically, one of the first insulating plate 31 and the cover plate 1 is provided with a positioning column 35, the other one of the first insulating plate 31 and the cover plate 1 is provided with a positioning groove matched with the positioning column 35, and the positioning column 35 is inserted into the positioning groove. It can be understood that, by providing the positioning column 35 and the positioning groove on the insulating member 3 and the cover plate 1, respectively, the positioning installation of the insulating member 3 is facilitated, and the insulating member 3 is prevented from rotating relative to the cover plate 1. In this embodiment, the positioning column 35 is disposed on a side surface of the first insulating plate 31 close to the cover plate 1, and the positioning groove is disposed on the cover plate 1.

In order to further improve the installation stability between the insulating member 3 and the cover plate 1, a plurality of positioning pillars 35 are disposed on one side surface of the first insulating plate 31 close to the cover plate 1 along the circumferential direction of the first insulating plate 31, and the plurality of positioning pillars 35 are uniformly distributed.

Specifically, the first insulating plate 31, the second insulating plate 32, the third insulating plate 33, and the positioning posts 35 in the insulating member 3 are integrally injection-molded.

In this embodiment, the cover plate 1 is provided with a positive pole and a negative pole at intervals. Correspondingly, the number of the insulating parts 3 is two, the two insulating parts 3 are respectively an anode insulating part and a cathode insulating part, the anode insulating part is arranged corresponding to the anode pole, the cathode insulating part is arranged corresponding to the cathode pole, and conductive particles are embedded in the anode insulating part. It will be appreciated that the insulating member 3 and the sealing ring 4 are made of insulating material to insulate the pole 5 from the cover plate 1. In order to improve the safety of the battery during use, a small amount of conductive particles are added in the positive electrode insulating piece, so that the positive electrode column and the cover plate 1 can be conducted, and the positive electrode column and the cover plate are in a weak conductive state.

Specifically, referring to fig. 5, the pole 5 includes a pole body 50 and a first flange 51 located at one end of the pole body 50 close to the battery core, the extending direction of the first flange 51 is perpendicular to the axis of the pole body 50, and the pole body 50 and the first flange 51 are integrally formed. In this embodiment, the positive post is made for the aluminum product, and the negative pole post is made for copper aluminium combined material, and the one end that the negative pole post is close to electric core is the copper product, and the one end that deviates from electric core is the aluminum product. The pole 5 is in a disc shape with thick middle flange and thin middle flange and can be formed by extrusion and stretching.

Specifically, the sealing ring 4 includes a first sealing portion and a second sealing portion which are arranged at an included angle, the first sealing portion is located between the first flange 51 and the cover plate 1, the second sealing portion is located between the pole body 50 and the hole wall of the mounting hole 10, and the second sealing portion can be abutted to the insulating member 3. It can be understood that the sealing ring 4 is in a ring structure, and the sealing ring 4 is sleeved on the outer peripheral part of the pole 5. The section of the sealing ring 4 is in an L shape, that is, the sealing ring 4 is composed of a first sealing part and a second sealing part which are arranged vertically. The sealing ring 4 is installed at the opening of the installation hole 10, and the first sealing part is clamped between the first flange 51 and the cover plate 1, and the second sealing part is clamped between the pole body 50 and the hole wall of the installation hole 10. This structure facilitates positioning by utilizing the shape of the seal ring 4 itself. Meanwhile, the second sealing part is abutted to the insulating part 3, namely, a gap between the pole 5 and the hole wall of the mounting hole 10 is filled up through the insulating part 3 and the sealing ring 4, and the mounting sealing performance of the pole 5 is improved.

Referring to fig. 4, a first step surface 11 is concavely arranged on one side surface of the cover plate 1 close to the battery core, and the seal ring 4 abuts against the first step surface 11; and, or the side of the cover plate 1 departing from the battery core is concavely provided with a second step surface 12, and the insulating part 3 abuts against the second step surface 12. In the present embodiment, the mounting hole 10 penetrates the first step surface 11 and the second step surface 12. The first step surface 11 and the second step surface 12 are respectively arranged on the two side surfaces of the cover plate 1 in a concave mode, the sealing ring 4 and the insulating part 3 are respectively installed on the first step surface 11 and the second step surface 12, the thickness of the cover plate 1 between the pressing plate 2 and the first flange 51 is favorably reduced, and the overall thickness size of the pole 5 is further reduced.

In an embodiment, the battery top cover further includes an insulating support 6, the insulating support 6 is disposed on a side surface of the cover plate 1 close to the battery core, the insulating support 6 is provided with an avoiding hole 61 communicated with the mounting hole 10, a hole wall of the avoiding hole 61 is provided with a second flange 62, a free end of the second flange 62 extends toward an axial direction of the avoiding hole 61, and the second flange 62 is clamped between the first flange 51 and the cover plate 1. In this embodiment, the insulating support 6 plays an insulating protection role. The avoiding hole 61 is used for penetrating the pole 5 and/or the connecting piece 7. The second flange 62 is arranged on the avoiding hole 61, and the second flange 62 is clamped between the first flange 51 and the cover plate 1, so that the insulating support 6 is installed and fixed.

Specifically, still be provided with explosion-proof valve on the apron 1, the both ends of explosion-proof valve communicate with the inside and the outside of battery respectively to accessible explosion-proof valve carries out the pressure release when making the battery incident appear in the use, improves the safety in utilization. The cover plate 1 is provided with an explosion-proof hole 13 for communicating the inside and the outside of the battery, the outlet end of the explosion-proof valve is communicated with the explosion-proof hole 13, the cover plate 1 is further provided with a protective film 8, and the protective film 8 is used for selectively plugging the explosion-proof hole 13. It can be understood that when the internal pressure of the battery exceeds a set value, the explosion-proof valve carries out pressure relief, the explosion-proof hole 13 is in a state to be used under normal conditions, and the explosion-proof hole 13 is communicated with the outside of the battery only during pressure relief, so that pressure relief is realized. Utilize protective film 8 to cover and establish on explosion-proof hole 13, be favorable to protecting explosion-proof hole 13, avoid external impurity to get into explosion-proof hole 13. The protective film 8 is made of a low-strength material, or the protective film 8 is bonded with the cover plate 1 through a low-viscosity adhesive layer, so that when the explosion-proof valve is decompressed, ejected gas or liquid can burst the protective film 8, and the explosion-proof valve is communicated with the outside of the battery.

Specifically, the cover plate 1 is further provided with a liquid injection hole 14. The injection hole 14 is used for injecting an electrolyte into the case. And after the electrolyte is injected, the liquid injection hole 14 is blocked.

The beneficial effect of this embodiment does: set up first mounting groove 52 through the middle part at utmost point post 5's first end, week portion at utmost point post 5's first end sets up first flange 51, utmost point post 5's second end sets up clamp plate 2 to make apron 1 and insulating subassembly pressed from both sides tightly between clamp plate 2 and first flange 51, the realization is fixed to utmost point post 5's installation, be favorable to reducing the part quantity of battery top cap, avoid carrying out the rubber coating to the battery top cap and mould plastics, have simple structure, simplify the characteristics that manufacturing process and cost of manufacture are low. Meanwhile, the first mounting groove 52 for mounting the connecting piece 7 is formed in the middle of the first end of the pole 5, so that the connecting piece 7 is welded in the first mounting groove 52, and the thermal influence on the insulating assembly around the pole 5 during welding is avoided. And, the first end of the pole 5 is provided with a first mounting groove 52 for mounting the connecting piece 7, so that the mounting space between the pole 5 and the battery core is increased.

Also provides a battery, which comprises the battery top cover. The battery further comprises a battery core and a connecting piece 7, one end of the connecting piece 7 is connected with a pole lug of the battery core, and the other end of the connecting piece 7 is connected with the bottom of the first mounting groove 52, so that the pole 5 is electrically connected with the battery core through the connecting piece 7. In this embodiment, the connecting member 7 is welded to the bottom of the first mounting groove 52. The welding position is kept away from the sealing ring 4 sleeved on the periphery of the pole 5, and the heat influence on the sealing ring 4 during welding is avoided. Meanwhile, the installation space between the pole 5 and the battery core is enlarged, and the assembling and welding operation is convenient.

The manufacturing method of the battery comprises the following steps: firstly, respectively manufacturing and molding the cover plate 1, the pressing plate 2, the insulating part 3, the sealing ring 4, the pole 5 and the insulating support 6. The cover plate 1 is formed by plate punching, the insulating part 3 is formed by injection molding, and the pole 5 is formed by extrusion and stretching. And secondly, assembling the cover plate 1, the pressing plate 2, the insulating part 3, the sealing ring 4, the pole 5 and the insulating support 6, penetrating the pole 5 into the mounting hole 10, and enabling the first flange 51 to be located on one side of the cover plate 1 close to the battery core. The pressing plate 2 is sleeved at one end, away from the battery core, of the pole 5, the insulating part 3 is clamped between the pressing plate 2 and the cover plate 1, the sealing ring 4 is clamped between the first flange 51 and the cover plate 1, and the second flange 62 of the insulating support 6 is clamped between the first flange 51 and the cover plate 1. And thirdly, applying pressure to the pressing plate 2 to clamp the insulating part 3, the sealing ring 4, the second flange 62 and the cover plate 1 between the pressing plate 2 and the first flange 51, and then welding the pressing plate 2 and the pole 5 to fix the pressing plate 2. And fourthly, connecting the top end of the battery with the core package through a connecting piece 7, inserting the core package into the shell, and welding the cover plate 1 and the shell to fix the cover plate 1 and the battery core of the battery.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims

1. A battery top cover is characterized by comprising a cover plate, a pressing plate, an insulating component and a pole column, the cover plate is provided with mounting holes penetrating through two side surfaces in the thickness direction of the cover plate, the pole posts penetrate through the mounting holes and are spaced from the cover plate, the pole comprises a pole body, a first mounting groove for mounting a connecting piece is arranged in the middle of the first end of the pole body, the periphery of the first end of the pole body is provided with a first flange, the free end of the first flange extends towards the direction departing from the axis of the mounting hole, the pressing plate is sleeved at one end of the pole body, which is far away from the first flange, the insulating assemblies are arranged between the pressing plate and the cover plate and between the first flange and the cover plate, and clamping the cover plate and the insulating assembly between the pressure plate and the first flange.

2. The battery top cap of claim 1, wherein the insulating assembly comprises an insulating member and a resilient sealing ring, the insulating member being located on a side adjacent to the pressure plate, the sealing ring being located on a side adjacent to the first flange.

3. The battery top cap of claim 2, wherein the insulating member is an annular structure, the insulating member includes a first insulating plate, a second insulating plate disposed on an outer ring side of the first insulating plate, and a third insulating plate disposed on an inner ring side of the first insulating plate, the first insulating plate is located between the pressing plate and the cover plate, the third insulating plate is located between the post body and a hole wall of the mounting hole, and a second mounting groove for accommodating the pressing plate is formed between the second insulating plate and the post body.

4. The battery top cover according to claim 3, wherein one of the first insulating plate and the cover plate is provided with positioning posts, and the other of the first insulating plate and the cover plate is provided with positioning slots matched with the positioning posts, and the positioning posts are plugged with the positioning slots.

5. The battery top cover according to claim 4, wherein a plurality of positioning pillars are arranged on one side surface of the first insulating plate close to the cover plate along the circumferential direction of the first insulating plate.

6. The battery top cap of any one of claims 2 or 3, wherein the sealing ring comprises a first sealing portion and a second sealing portion arranged at an included angle, the first sealing portion is located between the first flange and the cover plate, the second sealing portion is located between the pole body and the hole wall of the mounting hole, and the second sealing portion can abut against the insulating member.

7. The battery top cover according to any one of claims 2 or 3, wherein a first step surface is concavely arranged on one side surface of the cover plate close to the battery core, and the sealing ring abuts against the first step surface; and/or, a second step surface is concavely arranged on one side surface of the cover plate, which deviates from the battery cell, and the insulating part is abutted to the second step surface.

8. The battery top cap according to any one of claims 2 or 3, wherein there are two of the poles, the two poles are a positive pole and a negative pole respectively, the two insulators are a positive insulator and a negative insulator respectively, the positive insulator is disposed corresponding to the positive pole, the negative insulator is disposed corresponding to the negative pole, and conductive particles are embedded in the positive insulator.

9. The battery top cap of claim 8, wherein the insulator is injection molded.

10. The battery top cover according to claim 1, further comprising an insulating support, wherein the insulating support is disposed on a side surface of the cover plate close to the battery core, the insulating support is provided with an avoiding hole communicated with the mounting hole, a second flange is disposed on a hole wall of the avoiding hole, a free end of the second flange extends toward an axial direction of the avoiding hole, and the second flange is clamped between the first flange and the cover plate.

11. The battery top cap of claim 1, wherein the post body and the first flange are integrally formed.

12. A battery, comprising the battery top cap of any one of claims 1 to 11, and further comprising a battery cell and a connecting member, wherein one end of the connecting member is connected to a tab of the battery cell, and the other end of the connecting member is connected to a bottom of the first mounting groove, so that the terminal is electrically connected to the battery cell through the connecting member.