# US 2024/0201272 A1 · Evaluation method of secondary battery

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- Number: US 2024/0201272 A1
- Document ID: US20240201272A1
- Status: Published application
- Kind: A1
- Application number: 18/589,155
- Filed: 2024-02-27
- Published: 2024-06-20
- Earliest claimed: 2020-09-02
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Aiko Nagano; Mamoru Mizutani
- Web page: https://patentgrep.com/patent/US20240201272A1

## CPC

- G01R 31/388: involving voltage measurements
- H01M 10/0562: Solid materials
- G01R 31/386: {using test-loads}
- G01R 31/389: Measuring internal impedance, internal conductance or related variables
- G01R 31/392: Determining battery ageing or deterioration, e.g. state of health
- H01M 10/4285: {Testing apparatus}
- H01M 10/441: {for several batteries or cells simultaneously or sequentially}
- H01M 10/486: {for measuring temperature}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/448: {End of discharge regulating measures}
- Y02E 60/10: Energy storage using batteries
- 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

## Abstract

A durability evaluation method of a secondary battery includes a durability step of continuing to apply an alternating current voltage of a durability frequency to a first secondary battery for evaluation over a durability test period, and an evaluation step of evaluating durability of an associated battery reaction associated with the durability frequency from among battery reactions of the first secondary battery. A temperature and a state of charge of the first secondary battery are adjusted to a first temperature and a first state of charge, respectively.

## Claims

### Claim 1

A durability evaluation method of a secondary battery, the durability evaluation method comprising:
a durability step of continuing to apply an alternating current voltage of a durability frequency to a first secondary battery for evaluation over a durability test period, a temperature and a state of charge (SOC) of the first secondary battery being adjusted to a first temperature and a first SOC, respectively;
a determination step of determining whether the durability test period has elapsed; and based on the determination that the durability test period has elapsed, an evaluation step of evaluating durability of an associated battery reaction associated with the durability frequency from among battery reactions of the first secondary battery.

### Claim 2 (depends on 1)

The durability evaluation method according to claim 1, wherein the durability test period is greater than or equal to 5 days.