# US 12,603,270 B2 · Lithium-ion battery electrodeposition detection method

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,603,270 B2
- Document ID: US12603270B2
- Status: Granted
- Kind: B2
- Application number: 17/991,942
- Filed: 2022-11-22
- Published: 2023-06-15
- Granted: 2026-04-14
- Earliest claimed: 2021-12-14
- Assignees: Honda Motor Co., Ltd.
- Applicants: Honda Motor Co., Ltd.
- Inventors: Kenji Sato; Atsushi Tamai
- Web page: https://patentgrep.com/patent/US12603270B2

## CPC

- H01M 4/045: {Electrochemical coating; Electrochemical impregnation}
- 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 4/0404: {by coating on electrode collectors}
- H01M 4/382: {Lithium (H01M4/405 takes precedence)}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/42: Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells (H01M10/60 takes precedence)
- H01M 10/4285: {Testing apparatus}
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- 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

A lithium-ion battery electrodeposition detection method includes: a positive-electrode SOC map generation step of irradiating a lithium-ion battery with an X-ray, performing an X-ray diffraction measurement of a positive-electrode active material layer, and generating a positive-electrode SOC map that indicates a distribution of a charging depth along a thickness direction of the positive-electrode active material layer; a SOC difference value detection step of detecting a SOC difference value which is a difference between a maximum value and a minimum value of the positive-electrode SOC map; and a determination step of comparing the SOC difference value with a preset threshold value and determining a presence or absence of a lithium electrodeposition of a negative-electrode active material layer.

## Claims

### Claim 1

A lithium-ion battery electrodeposition detection method that detects a lithium electrodeposition which occurs at a negative-electrode active material layer of a lithium-ion battery in which a positive electrode having a positive-electrode collector body and a positive-electrode active material layer located on at least one surface of the positive-electrode collector body, a negative electrode facing the positive electrode and having a negative-electrode collector body and the negative-electrode active material layer located on at least one surface of the negative-electrode collector body, and an electrolyte layer located between the positive electrode and the negative electrode are layered, the lithium-ion battery electrodeposition detection method comprising:
a positive-electrode state-of-charge (SOC) map generation step of irradiating the lithium-ion battery with an X-ray, performing an X-ray diffraction measurement of the positive-electrode active material layer, and based on X-ray diffraction data obtained by the X-ray diffraction measurement of the positive-electrode active material layer, generating a positive-electrode SOC map that indicates a distribution of a charging depth representing an SOC along a thickness direction of the positive-electrode active material layer;
an SOC difference value detection step of detecting an SOC difference value which is a difference between a maximum value of the SOC and a minimum value of the SOC in the positive-electrode SOC map generated in the positive-electrode SOC map generation step;
an electrodeposition determination step of comparing the SOC difference value detected in the SOC difference value detection step with a preset threshold value and, based on a first result of the comparing, determining a presence or absence of the lithium electrodeposition of the negative-electrode active material layer; and
a controlling step of: based on a second result of the determining of the presence or the absence of the lithium electrodeposition of the negative-electrode active material layer, controlling a charging condition of the lithium-ion battery to mitigate the lithium electrodeposition and degradation of the lithium-ion battery.

### Claim 2 (depends on 1)

The lithium-ion battery electrodeposition detection method according to claim 1, wherein in the electrodeposition determination step, the threshold value is set to 15%, and it is determined that the lithium electrodeposition occurs in the negative-electrode active material layer in a case where the SOC difference value is 15% or more.

### Claim 3 (depends on 1)

The lithium-ion battery electrodeposition detection method according to claim 1, wherein in the positive-electrode SOC map generation step, the X-ray used for the X-ray diffraction measurement is a high-energy X-ray having an energy of 40 keV or more.

### Claim 4 (depends on 2)

The lithium-ion battery electrodeposition detection method according to claim 2, wherein in the positive-electrode SOC map generation step, the X-ray used for the X-ray diffraction measurement is a high-energy X-ray having an energy of 40 keV or more.