# US 11,906,592 B2 · Method of producing all-solid-state battery

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- Number: US 11,906,592 B2
- Document ID: US11906592B2
- Status: Granted
- Kind: B2
- Application number: 17/376,734
- Filed: 2021-07-15
- Published: 2022-01-20
- Granted: 2024-02-20
- Earliest claimed: 2020-07-20
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Ryuto Sakamoto
- Web page: https://patentgrep.com/patent/US11906592B2

## CPC

- G01R 31/3865: {related to manufacture, e.g. testing after manufacture}
- G01R 31/1227: {of components, parts or materials (G01R31/1209, G01R31/1218, G01R31/18 take precedence; circuits therefor G01R31/14; testing vessels of electrodes G01R31/16)}
- G01R 31/14: Circuits therefor {, e.g. for generating test voltages, sensing circuits (G01R31/1209 - G01R31/1227 take precedence; for testing switches G01R31/327)}
- G01R 31/389: Measuring internal impedance, internal conductance or related variables
- H01M 10/049: {Processes for forming or storing electrodes in the battery container}
- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 10/0562: Solid materials
- H01M 10/4285: {Testing apparatus}
- H01M 2300/0068: inorganic
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- 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 method of producing an all-solid-state battery includes forming an insulating layer-attached stack unit including an insulating layer and a stack unit that includes a positive electrode layer, a solid electrolyte layer and a negative electrode layer; performing a dielectric breakdown test on the insulating layer included in the insulating layer-attached stack unit, and determining that the insulating layer-attached stack unit is a non-defective product if no dielectric breakdown is present; forming an electrode member having both ends by disposing the two insulating layer-attached stack units at the both ends, the insulating layer-attached stack unit being determined to be a non-defective product; accommodating the electrode member in a case; and assembling a restraint member to the outside of the case to produce an all-solid-state battery.

## Claims

### Claim 1

A method of producing an all-solid-state battery, comprising:
forming an insulating layer-attached stack unit including an insulating layer and a stack unit that includes a positive electrode layer, a solid electrolyte layer and a negative electrode layer;
performing a dielectric breakdown test on the insulating layer included in the insulating layer-attached stack unit, and determining that the insulating layer-attached stack unit is a non-defective product if no dielectric breakdown is present;
forming an electrode member having both ends by disposing two insulating layer-attached stack units at the both ends, the insulating layer-attached stack unit being determined to be a non-defective product;
accommodating the electrode member in a case; and
assembling a restraint member to the outside of the case to produce the all-solid-state battery,
in the dielectric breakdown test, the a presence or absence of dielectric breakdown being confirmed at a predetermined test temperature with a predetermined test pressure applied to the insulating layer, the predetermined test temperature is greater than or equal to a measured operation maximum temperature of the electrode member and the predetermined test pressure is greater than or equal to a measured maximum restraint pressure of the electrode member,
under the test temperature and the test pressure of the dielectric breakdown test, the insulating layer having a property that the a thickness thereof is gradually reduced to a constant value,
the insulating layer being disposed between the stack unit and the case, and
the case including a metal material.

### Claim 2 (depends on 1)

The method of producing an all-solid-state battery according to claim 1, wherein
the restraint member applies to the insulating layer a pressure that is less than the test pressure in the dielectric breakdown test, and
the all-solid-state battery is used in an environment with a temperature that is equal to or lower than the test temperature in the dielectric breakdown test.

### Claim 3 (depends on 1)

The method of producing an all-solid-state battery according to claim 1, wherein
the electrode member having the both ends further includes one or more stack units disposed between the two insulating layer-attached stack units at the both ends, and
the insulating layer is disposed between adjacent stack units.

### Claim 4 (depends on 1)

The method of producing an all-solid-state battery according to claim 1, wherein the insulating layer comprises one or more of polypropylene, diamond-like carbon, alumina, anodized aluminum, silicon carbide, and boron nitride.