# US 12,181,531 B2 · Warning method and apparatus for battery thermal runaway, medium, and device

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

- Number: US 12,181,531 B2
- Document ID: US12181531B2
- Status: Granted
- Kind: B2
- Application number: 17/994,730
- Filed: 2022-11-28
- Published: 2023-03-23
- Granted: 2024-12-31
- Earliest claimed: 2020-05-29
- Assignees: BYD Company Limited
- Applicants: BYD Company Limited
- Inventors: Linwang Deng; Yonggang Yin; Tianyu Feng; Sijia Liu
- Web page: https://patentgrep.com/patent/US12181531B2

## CPC

- G01R 31/3835: involving only voltage measurements
- H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)}
- G01K 1/14: Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
- G01K 3/005: {Circuits arrangements for indicating a predetermined temperature (fire detection G08B17/00)}
- H01M 10/42: Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells (H01M10/60 takes precedence)
- H01M 10/4207: {for several batteries or cells simultaneously or sequentially}
- 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 10/486: {for measuring temperature}
- G01R 31/382: Arrangements for monitoring battery or accumulator variables, e.g. SoC
- H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- 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
- G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A warning method for battery thermal runaway includes: acquiring current temperature data of each temperature sensor arranged in a battery pack, current voltage data of each voltage sensor arranged in the battery pack, and current sensor disconnection data of each temperature sensor; calculating a number of occurrences of a primary feature at a current moment according to the current temperature data; calculating a number of occurrences of a secondary feature at the current moment according to the current voltage data and the current sensor disconnection data in a case that the number of occurrences of the primary feature is greater than 0; calculating a sum of the number of occurrences of the primary feature and the number of occurrences of the secondary feature at the current moment; and sending a warning for battery thermal runaway when the sum is greater than a preset feature number threshold.

## Claims

### Claim 1

A warning method for battery thermal runaway, comprising:
acquiring current temperature data of each temperature sensor arranged in a battery pack, current voltage data of each voltage sensor arranged in the battery pack, and current sensor disconnection data of each temperature sensor;
calculating a number of occurrences of a primary feature at a current moment according to the current temperature data, wherein the primary feature comprises an abnormal-temperature feature of the temperature sensor; the number of occurrences of the primary feature at the current moment is a sum of the numbers of occurrences of the abnormal-temperature feature of all of the temperature sensors arranged in the battery pack at the current moment;
calculating a number of occurrences of a secondary feature at the current moment according to the current voltage data and the current sensor disconnection data in a case that the number of occurrences of the primary feature is greater than 0, wherein the secondary feature comprises an abnormal-voltage feature of the voltage sensor and a sensor disconnection feature of the temperature sensor; the number of occurrences of the secondary feature at the current moment is a sum of occurrences of the sensor disconnection feature of all of the temperature sensors arranged in the battery pack at the current moment and occurrences of the abnormal-voltage feature of all of the voltage sensors at the current moment;
calculating a sum of the number of occurrences of the primary feature and the number of occurrences of the secondary feature at the current moment; and
sending a warning for battery thermal runaway in a case that the sum is greater than a preset feature number threshold.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the current temperature data comprises a current temperature and a current temperature rise rate; and the abnormal-temperature feature comprises the current temperature of the temperature sensor in the battery pack exceeding a preset temperature threshold and/or the current temperature rise rate of the temperature sensor in the battery pack exceeding a preset temperature rise rate threshold.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the abnormal-voltage feature comprises the voltage sensor in the battery pack being disconnected, a current voltage of the voltage sensor in the battery pack being greater than a preset voltage upper limit, and a current voltage of the voltage sensor in the battery pack being less than a preset voltage lower limit.

### Claim 4 (depends on 1)

The method according to claim 1, further comprising: determining that no thermal runaway occurs in a case that the number of occurrences of the primary feature is equal to 0.

### Claim 5

A warning apparatus for battery thermal runaway, comprising:
an acquisition module, configured to acquire current temperature data of each temperature sensor arranged in a battery pack, current voltage data of each voltage sensor arranged in the battery pack, and current sensor disconnection data of each temperature sensor;
a statistics module, configured to calculate a number of occurrences of a primary feature at a current moment according to the current temperature data, and calculate a number of occurrences of a secondary feature at the current moment according to the current voltage data and the current sensor disconnection data in a case that the number of occurrences of the primary feature is greater than 0, wherein the primary feature comprises an abnormal-temperature feature of the temperature sensor; the number of occurrences of the primary feature at the current moment is a sum of the numbers of occurrences of the abnormal-temperature feature of all of the temperature sensors arranged in the battery pack at the current moment; the secondary feature comprises an abnormal-voltage feature of the voltage sensor and a sensor disconnection feature of the temperature sensor; and the number of occurrences of the secondary feature at the current moment is a sum of occurrences of the sensor disconnection feature of all of the temperature sensors arranged in the battery pack at the current moment and occurrences of the abnormal-voltage feature of all of the voltage sensors at the current moment;
a calculation module, configured to calculate a sum of the number of occurrences of the primary feature and the number of occurrences of the secondary feature at the current moment; and
a warning module, configured to send a warning for battery thermal runaway in a case that the sum is greater than a preset feature number threshold.

### Claim 6 (depends on 5)

The apparatus according to claim 5, wherein the current temperature data comprises a current temperature and a current temperature rise rate; and the abnormal-temperature feature comprises the current temperature of the temperature sensor in the battery pack exceeding a preset temperature threshold and/or the current temperature rise rate of the temperature sensor in the battery pack exceeding a preset temperature rise rate threshold.

### Claim 7 (depends on 5)

The apparatus according to claim 5, wherein the abnormal-voltage feature comprises the voltage sensor in the battery pack being disconnected, a current voltage of the voltage sensor in the battery pack being greater than a preset voltage upper limit, and a current voltage of the voltage sensor in the battery pack being less than a preset voltage lower limit.

### Claim 8 (depends on 5)

The apparatus according to claim 5, wherein the warning module is further configured to determine that no thermal runaway occurs in a case that the number of occurrences of the primary feature is equal to 0.

### Claim 9

A non-transitory computer-readable storage medium storing a computer program for, when executed by at least one processor, the processor to perform:
acquiring current temperature data of each temperature sensor arranged in a battery pack, current voltage data of each voltage sensor arranged in the battery pack, and current sensor disconnection data of each temperature sensor;
calculating a number of occurrences of a primary feature at a current moment according to the current temperature data, wherein the primary feature comprises an abnormal-temperature feature of the temperature sensor; the number of occurrences of the primary feature at the current moment is a sum of the numbers of occurrences of the abnormal-temperature feature of all of the temperature sensors arranged in the battery pack at the current moment;
calculating a number of occurrences of a secondary feature at the current moment according to the current voltage data and the current sensor disconnection data in a case that the number of occurrences of the primary feature is greater than 0, wherein the secondary feature comprises an abnormal-voltage feature of the voltage sensor and a sensor disconnection feature of the temperature sensor; the number of occurrences of the secondary feature at the current moment is a sum of occurrences of the sensor disconnection feature of all of the temperature sensors arranged in the battery pack at the current moment and occurrences of the abnormal-voltage feature of all of the voltage sensors at the current moment;
calculating a sum of the number of occurrences of the primary feature and the number of occurrences of the secondary feature at the current moment; and
sending a warning for battery thermal runaway in a case that the sum is greater than a preset feature number threshold.

### Claim 10 (depends on 9)

The non-transitory computer-readable storage medium according to claim 9, wherein the current temperature data comprises a current temperature and a current temperature rise rate; and the abnormal-temperature feature comprises the current temperature of the temperature sensor in the battery pack exceeding a preset temperature threshold and/or the current temperature rise rate of the temperature sensor in the battery pack exceeding a preset temperature rise rate threshold.

### Claim 11 (depends on 9)

The non-transitory computer-readable storage medium according to claim 9, wherein the abnormal-voltage feature comprises the voltage sensor in the battery pack being disconnected, a current voltage of the voltage sensor in the battery pack being greater than a preset voltage upper limit, and a current voltage of the voltage sensor in the battery pack being less than a preset voltage lower limit.

### Claim 12 (depends on 9)

The non-transitory computer-readable storage medium according to claim 9, wherein the processor is further to perform: determining that no thermal runaway occurs in a case that the number of occurrences of the primary feature is equal to 0.