# US 12,183,914 B2 · Non-aqueous electrolyte secondary battery

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- Number: US 12,183,914 B2
- Document ID: US12183914B2
- Status: Granted
- Kind: B2
- Application number: 18/388,907
- Filed: 2023-11-13
- Published: 2024-03-07
- Granted: 2024-12-31
- Earliest claimed: 2020-09-16
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Yoshitomo Takebayashi
- Web page: https://patentgrep.com/patent/US12183914B2

## CPC

- H01M 4/364: {as mixtures}
- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A non-aqueous electrolyte secondary battery, in which a positive electrode includes a positive electrode mixture layer in which a mixture containing a positive electrode active material is formed and a positive electrode mixture layer non-forming portion in which the positive electrode mixture layer is not formed, and a negative electrode includes a negative electrode mixture layer in which a mixture containing a negative electrode active material is formed and a negative electrode mixture layer non-forming portion in which the negative electrode mixture layer is not formed. At least one of the positive electrode mixture layer non-forming portion and the negative electrode mixture layer non-forming portion has a resin portion substantially formed of a swellable resin having a property of swelling the non-aqueous electrolyte.

## Claims

### Claim 1

A non-aqueous electrolyte secondary battery comprising:
an electrode body that has a structure in which a plurality of positive electrodes and negative electrodes are stacked via a separator; and
a non-aqueous electrolyte, wherein:
the plurality of positive electrodes includes a positive electrode that has a positive electrode mixture layer in which a mixture containing a positive electrode active material is formed and a positive electrode mixture layer non-forming portion in which the positive electrode mixture layer is not formed;
the plurality of negative electrodes includes a negative electrode that has a negative electrode mixture layer in which a mixture containing a negative electrode active material is formed and a negative electrode mixture layer non-forming portion in which the negative electrode mixture layer is not formed;
at least one of the positive electrode mixture layer non-forming portion and the negative electrode mixture layer non-forming portion has a resin portion substantially formed of a swellable resin having a property of swelling the non-aqueous electrolyte; and
a thermal capacity of the resin portion is 10 J/(kg·K) or more per unit weight of the positive electrode mixture layer or the negative electrode mixture layer.

### Claim 2 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the thermal capacity of the resin portion is 20 J/(kg·K) or more per unit weight of the positive mixture layer or the negative electrode mixture layer.

### Claim 3 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the resin portion is formed along the positive electrode mixture layer or the negative electrode mixture layer.

### Claim 4 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the resin portion contains at least any one of polyvinylpyrrolidone, styrene-butadiene rubber, and an acrylic resin.

### Claim 5 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the resin portion is formed at least in the negative electrode mixture layer non-forming portion.