CN212934727U

CN212934727U - Secondary battery top cap

Info

Publication number: CN212934727U
Application number: CN202021837500.8U
Authority: CN
Inventors: 张彪; 周龙
Original assignee: Xiamen Haichen New Energy Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2021-04-09
Anticipated expiration: 2030-08-28

Abstract

The utility model discloses a secondary battery top cover used for sealing a secondary battery shell, which comprises a top cover main body, wherein the lower surface of the top cover main body is provided with an insulating layer, and the insulating layer is tightly attached to the lower surface of the top cover main body; the top cover main body is provided with two mounting holes with plastic rings, the two mounting holes penetrate through the top cover main body, the plastic rings are connected with the mounting holes in a sealing mode, and the two plastic rings are used for fixing a pole of a battery and avoiding the contact between the pole and the top cover of the battery; replace the use insulating support or insulating film among the prior art, insulating film has the advantage that is difficult for being lacerated in the insulating layer comparison, when practicing thrift the space in the casing, insulating properties is good, is favorable to electric core energy density and security performance to promote, and wherein the setting of plastic ring in the top cap main part prevents in the battery use, avoids the electrode of battery and the mounting hole contact in the top cap main part and the electric core electric leakage and the inside short circuit of electric core that causes.

Description

Secondary battery top cap

Technical Field

The utility model relates to a secondary battery processing technology field, concretely design a secondary battery top cap.

Background

A secondary battery is also called a rechargeable battery or a secondary battery, and refers to a battery that can be continuously used by activating an active material by charging after the battery is discharged. By utilizing the reversibility of chemical reactions, a new battery can be constructed, namely after one chemical reaction is converted into electric energy, the chemical system can be repaired by using the electric energy, and then the electric energy is converted into the electric energy by utilizing the chemical reaction, so the battery is called a secondary battery (a rechargeable battery). The main rechargeable batteries in the market include nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid (or lead storage) batteries, lithium ion batteries, polymer lithium ion batteries and the like.

In order to isolate the battery core electrode group in the battery from the outside independently and provide a stable chemical reaction environment for the battery, the secondary battery in the prior art comprises a shell, an electrode assembly accommodated in the shell and a top cover assembly hermetically connected with the shell; the top cap adopts electrically conductive material, therefore the easy short circuit of electricity core, need be with insulating in order to prevent the inside short circuit of battery between electricity core and the top cap, promotes the security performance of battery.

In the prior art, in order to enable the top cover and the battery cell to be in an insulation state, an insulation support or a covering insulation film is arranged below the top cover to isolate the top cover from the battery cell; however, the insulating support occupies a large space in the housing, which is not beneficial to improving the energy density of the battery cell, and the insulating film is easily scratched by the battery cell, resulting in poor insulating effect.

SUMMERY OF THE UTILITY MODEL

The utility model provides a secondary battery top cap has solved the top cap below among the prior art and has been provided with insulating support or cover insulating film, has restricted the energy density of electric core and the easy damaged problem of insulating film, and it accounts for the space few when using, and difficult damaged is favorable to the promotion of electric core energy density and security performance.

In order to solve the technical problem, the utility model provides a following technical scheme:

the secondary battery top cover comprises a top cover main body, wherein the top cover main body is used for sealing a secondary battery shell, and is characterized in that the lower surface of the top cover main body is provided with an insulating layer; the top cap main part is provided with two mounting holes that have the plastic ring, two the mounting hole all runs through the top cap main part, the plastic ring with sealing connection between the mounting hole, two plastic rings are used for fixed battery's utmost point post, avoid utmost point post and top cap main part contact.

Set up the insulating layer in this scheme and be used for insulating between top cap main part and the electric core, replace use insulating support or insulating film among the prior art, insulating film has the advantage that is difficult for being lacerated in the insulating layer comparison, when practicing thrift the space in the casing, insulating properties is good, be favorable to electric core energy density and security performance to promote, the setting of plastic ring in the top cap main part, prevent in the battery use, avoid the electrode of battery and the mounting hole contact in the top cap main part and the electric core electric leakage and the inside short circuit of electric core that causes.

Further, the thickness of the insulating layer is 5 μm to 100 μm.

Further, the insulating layer is made of oxide ceramics, the insulating layer completely covers the lower surface of the top cover of the secondary battery, and the insulating layer can be covered on the lower surface of the top cover main body by adopting an electroplating process.

Furthermore, the insulating layer completely covers the lower surface of the top cover main body, and the insulating layer is made of insulating paint; an insulating layer is deposited on the lower surface of the cap body by an electrophoretic process.

Furthermore, the insulating layer can also adopt an insulating thin plate, for example, the insulating layer 2 is made of a polyvinyl chloride plate or a polyethylene plate, so that the insulating layer is firmly and reliably bonded with the lower surface of the top cover main body, and the insulating layer is prevented from falling; a bonding layer is arranged between the top cover main body and the insulating layer and is formed by solidifying liquid glue.

Preferably, the adhesive layer has a thickness of 10 to 50 μm.

Further, the battery top cover is made of aluminum alloy materials.

Preferably, both of the mounting holes and both of the plastic rings are rectangular in shape.

Furthermore, in order to facilitate the installation of the sealing end cover on the top cover main body, a through hole for fixing the sealing end cover is formed in the top cover main body, and the through hole is of a structure with a large upper part and a small lower part. The arrangement of the through hole with the big top and the small bottom avoids that the sealing end cover falls into the shell filled with the electrolyte from the through hole when the sealing end cover is installed and fixed.

Compared with the prior art, the utility model, have following advantage: 1. replace the use insulating support or insulating film among the prior art, insulating film has the advantage that is difficult for being lacerated in the insulating layer comparison, when practicing thrift the space in the casing, insulating properties is good, is favorable to electric core energy density and security performance to promote.

2. The utility model provides a secondary battery top cap, wherein the setting of plastic ring on the top cap main part prevents in the battery use, avoids the electrode of battery and the mounting hole contact on the top cap main part and the electric core electric leakage that causes and the inside short circuit of electric core.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is a schematic top view of a secondary battery top cap.

Fig. 2 is a schematic sectional view of a secondary battery top cap in front view.

Reference numbers and corresponding part names in the drawings: 1. a cap body; 2. an insulating layer; 3. a plastic ring; 4. mounting holes; 5. an adhesive layer; 6. and a through hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail with reference to the following embodiments, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not intended as limitations of the present invention.

As shown in fig. 1-2, a secondary battery top cap is provided, which includes a top cap main body 1, wherein the top cap main body 1 is disposed on the top of a secondary battery case and is used for sealing the secondary battery case and preventing an electrolyte in the case from leaking; the top cover main body 1 is made of an aluminum alloy material, the lower surface of the top cover main body 1 is provided with a layer of insulating layer 2, and the thickness of the insulating layer 2 is 5-100 micrometers.

In a specific embodiment, the material of the insulating layer 2 is oxide ceramic, and the battery top cover 1 can be well insulated by covering the lower surface of the top cover main body 1 with the oxide ceramic by an electroplating process, wherein the oxide ceramic is selected from alumina ceramic or other insulating oxide ceramic.

As a specific embodiment, the material of the insulating layer 2 may also be an insulating varnish, such as an epoxy paint, deposited on the lower surface of the top cover body by an electrophoretic process.

As a specific embodiment, the insulating layer 2 may also be an insulating thin plate, for example, the insulating layer 2 is made of a polyvinyl chloride plate or a polyethylene plate, the insulating layer 2 is tightly attached to the lower surface of the top cover main body 1, when the insulating layer 2 is made of a polyvinyl chloride plate or a polyethylene plate, an adhesive layer 5 needs to be disposed between the top cover main body 1 and the insulating layer 2, the thickness of the adhesive layer 5 is 10 μm to 50 μm, the adhesive layer 5 is formed by solidifying liquid glue, for example, the adhesive layer 5 can be uniformly sprayed on the lower surface of the top cover main body 1 by 502 glue, and then the insulating layer 2 is adhered to the lower surface of the top cover main body 1, so that the insulating layer 2 is firmly and reliably adhered to the lower surface of the top cover 1 of the battery, and the.

Be provided with two mounting holes 4 that have plastic ring 3 on the top cap, two mounting hole 4 all runs through battery top cap 1, plastic ring 3 with sealing connection between the mounting hole 4, for the standard electrode shape of matching the battery, the shape of two mounting holes 4 and two plastic ring 3 is the rectangle, and two plastic ring 3 are used for the utmost point post of fixed battery, avoid utmost point post and battery top cap 1 contact.

The top cover main body 1 is provided with a through hole 6 for fixing the sealing end cover, so that the sealing end cover can be conveniently installed on the top cover main body 1; the through hole 6 is of a structure with a large upper part and a small lower part. The through hole 6 is arranged in a large-end-up mode, so that the sealing end cover is prevented from falling into the shell filled with electrolyte from the through hole 6 when the sealing end cover is installed and fixed.

Set up insulating layer 2 at top cap main part 1 lower surface in this scheme and be used for insulating between top cap and the electric core, replace use insulating support or insulating film among the prior art, insulating layer 2 compares insulating film and has the advantage that is difficult for being lacerated, when practicing thrift the space in the casing, insulating properties is good, be favorable to electric core energy density and security performance to promote, the setting of plastic ring 3 on the top cap, prevent in the battery use, avoid the electrode of battery and the contact of mounting hole 4 on top cap main part 1 and the electric core electric leakage and the inside short circuit of electric core that cause.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A secondary battery top cover comprises a top cover main body (1), wherein the top cover main body (1) is used for sealing a secondary battery shell, and is characterized in that an insulating layer (2) is arranged on the lower surface of the top cover main body (1); be provided with two mounting holes (4) that have plastics ring (3) on top cap main part (1), two mounting hole (4) all run through top cap main part (1), plastics ring (3) with sealing connection between mounting hole (4), two plastics ring (3) are used for the utmost point post of fixed battery, avoid utmost point post and top cap main part (1) contact.

2. The secondary battery top cap according to claim 1, wherein the thickness of the insulating layer (2) is 5 to 100 μm.

3. The secondary battery top cap according to claim 1, wherein the material of the insulating layer (2) is oxide ceramic, and the insulating layer (2) completely covers the lower surface of the top cap body (1).

4. The secondary battery top cap according to claim 1, wherein the material of the insulating layer (2) is insulating varnish, and the insulating layer (2) completely covers the lower surface of the top cap body (1).

5. The secondary battery top cap according to claim 1, wherein an adhesive layer (5) is arranged between the top cap body (1) and the insulating layer (2), and the adhesive layer (5) is formed by solidifying liquid glue.

6. A secondary battery top cap according to claim 5, characterized in that the thickness of the adhesive layer (5) is 10 μm to 50 μm.

7. A secondary battery top cap according to claim 1, characterized in that the material of the top cap body (1) is an aluminum alloy material.

8. A secondary battery top cap according to any one of claims 1 to 7, characterized in that both of the two mounting holes (4) and both of the plastic rings (3) are rectangular in shape.

9. The secondary battery top cover according to claim 1, wherein the top cover main body (1) is provided with a through hole (6) for fixing a sealing end cover, and the through hole (6) is of a structure with a large top and a small bottom.