# US 12,603,344 B2 · Method for cooling battery

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- Number: US 12,603,344 B2
- Document ID: US12603344B2
- Status: Granted
- Kind: B2
- Application number: 18/644,736
- Filed: 2024-04-24
- Published: 2025-01-16
- Granted: 2026-04-14
- Earliest claimed: 2023-07-11
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Tsubasa Migita; Masahide Iida; Yasumasa Oguma; Yusuke Kuruma; Keisuke Ukita
- Web page: https://patentgrep.com/patent/US12603344B2

## CPC

- H01M 10/613: Cooling or keeping cold
- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 10/633: characterised by algorithms, flow charts, software details or the like
- H01M 10/647: Prismatic or flat cells, e.g. pouch cells
- H01M 10/6556: Solid parts with flow channel passages or pipes for heat exchange (closed pipes H01M10/6552)
- H01M 10/6561: Gases
- H01M 10/6568: characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
- H01M 50/105: Pouches or flexible bags
- H01M 50/178: for pouch or flexible bag cells
- H01M 50/188: the sealing members being arranged between the lid and terminal
- H01M 50/193: Organic material
- H01M 50/211: adapted for pouch cells
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- 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

## Abstract

In a laminated all-solid-state battery, a negative electrode terminal and a positive electrode terminal around which a resin sheet is wound are sandwiched between exterior members (laminate films), and the exterior members are joined by heat welding. The laminated all-solid-state battery is in contact with the heat exchanger via a heat conductive sheet. When the terminal temperature detected by the temperature sensor provided at the negative electrode terminal and the positive electrode terminal is equal to or higher than a predetermined value, the flow rate control valve is fully closed and the flow rate control valve is fully opened. The cooling amount of the joint portion in which the negative electrode terminal and the positive electrode terminal extend increases, the temperature of the joint portion decreases, the deformation of the resin sheet is suppressed, and the unsealing of the seal is suppressed.

## Claims

### Claim 1

A method for cooling a battery including
a power generation element including an all-solid-state battery stack, and
an exterior member including a laminate film housing the power generation element and having a peripheral edge joined by thermal welding to seal the power generation element,
an electrode terminal of the power generation element extending from a joint portion of the exterior member, the method comprising:
detecting a terminal temperature of the joint portion from which the electrode terminal extends;
cooling the joint portion by fully opening a flow rate control valve provided in a flow path of a heat exchanger corresponding to the joint portion and increasing a flow rate of a heat medium in the flow path in a case where the terminal temperature is higher than a first predetermined value; and
cooling the battery by the heat medium flowing through an entire flow path of the heat exchanger in a case where the terminal temperature is equal to or lower than the first predetermined value, wherein
the heat medium flowing through the flow path is a liquid cooling medium, and
a thermoplastic resin sheet is disposed between the electrode terminal and the exterior member at the joint portion.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the all-solid-state battery stack is a sulfide-based all-solid-state battery.

### Claim 3 (depends on 1)

The method according to claim 1, wherein:
the thermoplastic resin sheet is wrapped around the electrode terminal; and
the terminal temperature is detected by a temperature sensor provided in the thermoplastic resin sheet.