CN218569137U

CN218569137U - High-temperature-resistant punching isolating membrane

Info

Publication number: CN218569137U
Application number: CN202222741691.3U
Authority: CN
Inventors: 罗志文; 韩上云; 韩海燕; 罗晟天; 韩上河; 洪少娜; 韩上松
Original assignee: Guangzhou Shengda Industry Co ltd
Current assignee: Guangzhou Shengda Industry Co ltd
Priority date: 2022-10-18
Filing date: 2022-10-18
Publication date: 2023-03-03
Anticipated expiration: 2032-10-18

Abstract

The utility model discloses a high temperature resistant barrier film that punches relates to barrier film technical field. Including basic unit, positive pole piece, negative pole piece, both sides all are provided with a plurality of arc piece about the basic unit, the surface that the arc piece is close to positive pole piece or negative pole piece has evenly scribbled thermal barrier coating. The utility model provides a high temperature resistant punching isolating membrane, which is simultaneously beneficial to the heat dissipation generated during the working of a battery by arranging a plurality of gaps at the separation part of an arc-shaped block, and can better protect a base layer and avoid the damage of the base layer; through setting up a plurality of arc pieces, and interval distribution such as a plurality of arc pieces, can form a plurality of clearances between basic unit and positive pole piece or the negative pole piece, electrolyte gets into from a plurality of clearances, can let the infiltration basic unit that electrolyte can be abundant, absorption electrolyte that basic unit can be better, the polarization that reduces the battery improves the security performance of battery.

Description

High-temperature-resistant punching isolating membrane

Technical Field

The utility model relates to an isolating membrane technical field especially relates to a high temperature resistant isolating membrane that punches.

Background

Lithium ion batteries generally comprise a positive electrode, a negative electrode, a separation film and an electrolyte, wherein the separation film is used as a barrier between the positive electrode and the negative electrode, has good insulation for electrons and good permeability for ions, and is an important component of the battery. In practical use, the separator must be adapted to the changes of the positive and negative electrodes and the electrolyte of the battery during the charging and discharging processes. In addition, the performance of the separator also determines the interface structure and internal resistance of the battery, and further influences the key performances of the battery such as capacity, cycle performance, charge-discharge current density and the like.

Firstly, free electrolyte inevitably undergoes redox reaction with positive and negative electrodes in charge-discharge circulation, which consumes a large amount of electrolyte to cause poor battery solution, thereby increasing the polarization of the battery, and simultaneously causing the electrolyte at the position of the isolating membrane not to be fully soaked, thus influencing the exertion of the electrochemical performance of the battery and the storage capacity of the battery; secondly, the lithium battery generates heat when used for a long time, and parts such as a separator inside the battery are easily damaged due to overheating.

SUMMERY OF THE UTILITY MODEL

The utility model provides a high temperature resistant barrier film that punches has solved the technical problem that above-mentioned background art provided.

In order to solve the technical problem, the utility model provides a pair of high temperature resistant barrier film that punches, including basic unit, positive pole piece, negative pole piece, both sides all are provided with a plurality of arc piece about the basic unit, the surface that the arc piece is close to positive pole piece or negative pole piece has evenly been smeared thermal barrier coating.

Preferably, the arc piece adopts thermal insulation material, and the arc piece adopts rock wool board material, and the arc piece passes through glue and bonds on the basic unit.

Preferably, a plurality of the arc blocks are distributed at equal intervals.

Preferably, the thickness of the arc-shaped block is 20-30 μm.

Preferably, the thickness of the thermal barrier coating is 4-8 μm.

Preferably, the heat insulation coating is formed by mixing silica and magnesium oxide with dimethyl sulfoxide solution.

Preferably, the mass ratio of silica to magnesia is 100:10-100:15, the mass ratio of the silicon dioxide to the dimethyl sulfoxide solution is 1:6-1:10.

compared with the prior art, the utility model provides a pair of high temperature resistant isolation film that punches has following beneficial effect:

the utility model provides a high temperature resistant barrier film that punches, through setting up a plurality of clearances of arc piece partition department simultaneously, help the battery to produce the thermal effluvium while working, isolate the heat through arc piece and thermal barrier coating with heat-proof quality at the same time, can better protection basic unit, avoid its damage;

through setting up a plurality of arc pieces, and interval distribution such as a plurality of arc pieces, can form a plurality of clearances between basic unit and positive pole piece or the negative pole piece, electrolyte gets into from a plurality of clearances, can let the infiltration basic unit that electrolyte can be abundant, absorption electrolyte that the basic unit can be better reduces the polarization improvement battery's of battery security performance.

Drawings

FIG. 1 is a schematic structural diagram of a high temperature resistant perforated barrier film.

Reference numbers in the figures: 1. a base layer; 2. a positive electrode plate; 3. a negative pole piece; 4. an arc-shaped block; 5. and (4) a thermal insulation coating.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments; based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Given by figure 1, the utility model discloses a 1, positive pole piece 2, negative pole piece 3 of basic unit, 1 upper and lower both sides of basic unit all are provided with a plurality of arc piece 4, and arc piece 4 adopts thermal insulation material, and arc piece 4 adopts rock wool board material, and arc piece 4 bonds on 1 of basic unit through glue, and interval distribution such as a plurality of arc pieces 4, the thickness of arc piece 4 are 20-30 mu m, thermal-insulated coating 5 has evenly been paintd on the surface that arc piece 4 is close to positive pole piece 2 or negative pole piece 3, and thermal-insulated coating 5's thickness is 4-8 mu m, and thermal-insulated coating 5 adopts silica, the mixed dimethyl sulfoxide solution of magnesium oxide to form, and the quality ratio of silica and magnesium oxide is 100:10-100:15, the mass ratio of the silicon dioxide to the dimethyl sulfoxide solution is 1:6-1:10;

the upper surface and the lower surface of the base layer 1 are respectively provided with the arc blocks 4 with heat insulation performance, the surfaces of the arc blocks 4 are uniformly coated with the heat insulation coatings 5, the arc blocks 4 are arranged, the arc blocks 4 are distributed at equal intervals, gaps are divided into a plurality of gaps, a plurality of gaps can exist among the base layer 1, the positive pole piece 2 and the negative pole piece 3, electrolyte enters from the gaps, the base layer 1 can be fully soaked by the electrolyte, the base layer 1 can better absorb the electrolyte, the polarization of the battery is reduced, and the safety performance of the battery is improved;

simultaneously through setting up a plurality of clearances of arc piece 4 partition department, help the battery during operation to produce thermal effluvium, simultaneously through having the isolated heat of arc piece 4 and thermal barrier coating 5 of heat-proof quality, protection basic unit 1 that can be better avoids its damage.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a high temperature resistant barrier film that punches, includes basic unit (1), positive pole piece (2), negative pole piece (3), its characterized in that, both sides all are provided with a plurality of arc piece (4) about basic unit (1), thermal barrier coating (5) have evenly been paintd on the surface that arc piece (4) are close to positive pole piece (2) or negative pole piece (3).

2. The high-temperature-resistant perforated isolating membrane as claimed in claim 1, wherein the arc blocks (4) are made of heat-insulating materials, the arc blocks (4) are made of rock wool boards, and the arc blocks (4) are bonded on the base layer (1) through glue.

3. The high-temperature-resistant perforated separation film according to claim 1, wherein a plurality of the arc-shaped blocks (4) are distributed at equal intervals.

4. The high temperature resistant perforated separator of claim 1, wherein the thickness of the arc-shaped blocks (4) is 20-30 μm.

5. A high temperature resistant perforated separator according to claim 1, wherein the thickness of the thermal barrier coating (5) is 4-8 μm.