# US 2021/0083333 A1 · Washer for secondary battery, secondary battery including same, and method for manufacturing washer for secondary battery

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- Number: US 2021/0083333 A1
- Document ID: US20210083333A1
- Status: Published application
- Kind: A1
- Application number: 16/954,422
- Filed: 2018-12-21
- Published: 2021-03-18
- Earliest claimed: 2017-12-22
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Byoung Gu LEE; Do Gyun KIM; Je Jun LEE; Sang Suk JUNG; Hang Soo SHIN
- Web page: https://patentgrep.com/patent/US20210083333A1

## CPC

- H01M 10/4228: {Leak testing of cells or batteries}
- C09J 7/22: Plastics; Metallised plastics
- C09J 11/06: organic
- C09J 121/00: Adhesives based on unspecified rubbers
- C09J 133/06: of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J 133/08: Homopolymers or copolymers of acrylic acid esters
- C09J 183/00: Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
- G01N 21/80: Indicating pH value
- G01N 31/22: using chemical indicators (G01N31/02 takes precedence)
- H01M 10/02: Details (of electrodes H01M4/00; of non-active parts H01M50/00)
- H01M 10/48: Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569)
- H01M 50/147: Lids or covers
- H01M 50/15: for prismatic or rectangular cells (H01M50/153 takes precedence)
- H01M 50/152: for cells having curved cross-section, e.g. round or elliptic (H01M50/15, H01M50/153 take precedence)
- H01M 50/159: Metals
- H01M 50/176: for prismatic or rectangular cells (H01M50/181 takes precedence)
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present invention relates to a washer for a secondary battery including a film layer and an adhesive layer disposed on at least one surface of the film layer, wherein the adhesive layer includes an adhesive component and an indicator component, and the indicator component is fat-soluble, a secondary battery including the same, and a method for manufacturing the washer.

## Claims

### Claim 1

A washer for a secondary battery, comprising:
a film layer, and
an adhesive layer on at least one surface of the film layer,
wherein the adhesive layer includes an adhesive component and an indicator component, and
wherein the indicator component is fat-soluble.

### Claim 2 (depends on 1)

The washer of claim 1, wherein the color of the indicator component is configured to change in an acidic region of pH 4.0 or less.

### Claim 3 (depends on 1)

The washer of claim 1, wherein the indicator component includes at least any one of p-dimethylaminoazobenzene, tropeolin OO, crystal violet, celliton fast violet 6B, and pentamethoxy red.

### Claim 4 (depends on 1)

The washer of claim 1, wherein the adhesive layer includes the indicator component in an amount of 0.02 wt % to 30 wt % based on the total weight of the adhesive layer.

### Claim 5 (depends on 1)

The washer of claim 1, wherein the adhesive component comprises at least any one selected from the group consisting of an acryl-based adhesive compound, a rubber-based adhesive compound, a silicone-based adhesive compound, and a vinyl ether-based adhesive compound.

### Claim 6 (depends on 5)

The washer of claim 5, wherein the acryl-based adhesive compound comprises at least any one of
a) a (meth) acrylate-based resin;
b) a homopolymer or a copolymer comprising an acrylic acid ester-based monomer derived unit; and
c) a copolymer comprising at least one selected from the acrylic acid ester-based monomer derived unit, an acrylic acid monomer derived unit, an acrylic acid 2-hydroxy ethyl monomer derived unit, and a vinyl acetate monomer derived unit.

### Claim 7 (depends on 1)

The washer of claim 1, wherein the film layer includes a material layer configured to transmit a change in color of the adhesive layer to an outside with the film layer interposed therebetween.

### Claim 8 (depends on 7)

The washer of claim 7, wherein the film layer includes a transparent material layer or a translucent material layer.

### Claim 9 (depends on 1)

The washer of claim 1, wherein the film layer comprises a polymer resin, and the polymer resin includes at least any one selected from the group consisting of a polyolefin-based polymer resin, an acryl-based polymer resin, a polycarbonate-based polymer resin, a vinyl-based polymer resin, an ABS resin, a polystyrene-based polymer resin, a polycarbonate-based polymer resin, tetrafluoroethylene, teflon, polybutylterephthalate, and polyethylene terephthalate.

### Claim 10

A method for manufacturing a washer for a secondary battery, the method comprising:
preparing an adhesive solution including an adhesive component and a first organic solvent;
preparing an indicator solution including an indicator component and a second organic solvent;
preparing a composition for an adhesive layer by mixing the adhesive solution and the indicator solution;
applying the composition for an adhesive layer on a base film; and
drying the base film having the adhesive layer applied thereon,
wherein the indicator component is fat-soluble.

### Claim 11

A secondary battery comprising:
an electrode assembly including a positive electrode, a separator, and a negative electrode;
a can having the electrode assembly embedded therein and including a crimping portion on the top thereof; and
a washer mounted on the crimping portion,
wherein the washer includes:
a film layer, and
an adhesive layer on at least one surface of the film layer,
wherein the adhesive layer includes an adhesive component and a fat-soluble indicator component.

### Claim 12 (depends on 11)

The secondary battery of claim 11, wherein the washer is fixed on the crimping portion in an adhesive manner or a mechanical coupling manner.

### Claim 13 (depends on 11)

The secondary battery of claim 11, wherein the color of the indicator component is configured to change in an acidic region of pH 4.0 or less.

### Claim 14 (depends on 11)

The secondary battery of claim 11, wherein the indicator component includes at least any one of p-dimethylaminoazobenzene, tropeolin OO, crystal violet, celliton fast violet 6B, and pentamethoxy red.

### Claim 15 (depends on 11)

The secondary battery of claim 11, wherein the adhesive layer includes the indicator component in an amount of 0.02 wt % to 30 wt % based on the total weight of the adhesive layer.

### Claim 16 (depends on 11)

The secondary battery of claim 11, wherein the adhesive component comprises at least any one selected from the group consisting of an acryl-based adhesive compound, a rubber-based adhesive compound, a silicone-based adhesive compound, and a vinyl ether-based adhesive compound.

### Claim 17 (depends on 16)

The secondary battery of claim 16, wherein the acryl-based adhesive compound comprises at least any one of
a) a (meth) acrylate-based resin;
b) a homopolymer or a copolymer comprising an acrylic acid ester-based monomer derived unit; and
c) a copolymer comprising at least one selected from the acrylic acid ester-based monomer derived unit, an acrylic acid monomer derived unit, an acrylic acid 2-hydroxy ethyl monomer derived unit, and a vinyl acetate monomer derived unit.

### Claim 18 (depends on 11)

The secondary battery of claim 11, wherein the film layer includes a material layer configured to transmit a change in color of the adhesive layer to an outside with the film layer interposed therebetween.

### Claim 19 (depends on 7)

The secondary battery of claim 7, wherein the film layer includes a transparent material layer or a translucent material layer.

### Claim 20 (depends on 11)

The secondary battery of claim 11, wherein the film layer comprises a polymer resin, and the polymer resin includes at least any one selected from the group consisting of a polyolefin-based polymer resin, an acryl-based polymer resin, a polycarbonate-based polymer resin, a vinyl-based polymer resin, an ABS resin, a polystyrene-based polymer resin, a polycarbonate-based polymer resin, tetrafluoroethylene, teflon, polybutylterephthalate, and polyethylene terephthalate.