Power supply device and failure detection method for battery

Patent metadata

Field	Value
Publication number	US-12196811-B2
Application number	US-202218090767-A
Country	US
Kind code	B2
Filing date	Dec 29, 2022
Priority date	Jun 29, 2020
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

A power supply device includes a measurement unit that measures at least one of a voltage and a current of a lithium ion battery, a peak detection unit that detects at least one of a maximum value of the current and a minimum value of the voltage at regular time intervals using at least one of the voltage and the current measured by the measurement unit, and a determination unit that determines a failure of the lithium ion battery based on at least one of the maximum value of the current and the minimum value of the voltage detected at regular time intervals by the peak detection unit.

First claim

The invention claimed is:

1. A power supply device comprising:
a measurement unit configured to measure a voltage and a current of a lithium ion battery;
a peak detection unit configured to detect a maximum value of the current and a minimum value of the voltage at regular time intervals using the voltage and the current measured by the measurement unit; and
a determination unit configured to determine a failure of the lithium ion battery based on the maximum value of the current and the minimum value of the voltage detected at the regular time intervals by the peak detection unit,
wherein the peak detection unit is a peak holding unit that holds the maximum value of the current and the minimum value of the voltage at the regular time intervals from the voltage and the current measured by the measurement unit,
wherein the measurement unit comprises a current measurement unit and a voltage measurement unit,
wherein the peak holding unit comprises an upper peak hold circuit and a lower peak hold circuit,
wherein the determination unit comprises a microcontroller,
wherein the current measurement unit outputs the current to the upper peak hold circuit and the microcontroller, the voltage measurement unit outputs the voltage to the lower peak hold circuit and the microcontroller,
wherein the upper peak hold circuit outputs the maximum current value to the microcontroller at the regular time intervals and the lower peak hold circuit outputs the minimum voltage value to the microcontroller at the regular time intervals, and
wherein the microcontroller resets the upper peak hold circuit and the lower peak hold circuit at the regular time intervals.

2. The power supply device according to claim 1 , further comprising a temperature measurement unit configured to measure a temperature of the lithium ion battery,
wherein the determination unit determines the failure of the lithium ion battery based on the maximum value of the current and the minimum value of the voltage detected by the peak detection unit, at least one of the voltage and the current measured by the measurement unit, and the temperature measured by the temperature measurement unit.

3. The power supply device according to claim 1 , further comprising a temperature measurement unit configured to measure a temperature of the lithium ion battery,
wherein the determination unit determines the failure of the lithium ion battery based on the maximum value of the current and the minimum value of the voltage detected by the peak detection unit, the voltage and the current measured by the measurement unit, and the temperature measured by the temperature measurement unit.

4. The power supply device according to claim 1 , wherein the determination unit determines the failure of the lithium ion battery using a learned model using a neural network.

5. The power supply device according to claim 1 , wherein each of the regular time intervals is 1 minute or less.

6. A failure detection method for a battery, comprising:
measuring, by a measuring unit, a voltage and a current of a lithium ion battery;
detecting, by a peak detection unit, a maximum value of the current and a minimum value of the voltage at regular time intervals using the measured voltage and the measured current;
determining, by a microcontroller, the failure of the lithium ion battery based on the maximum value of the current and the minimum value of the voltage detected at regular time intervals, wherein
the detecting includes holding, by a peak holding unit, the maximum value of the current and the minimum value of the voltage at the regular time intervals from the voltage and the current measured by the measurement unit,
the measurement unit comprises a current measurement unit and a voltage measurement unit,
the peak holding unit comprises an upper peak hold circuit and a lower peak hold circuit,
the measuring includes outputting, by the current measurement unit, the current to the upper peak hold circuit and the microcontroller, and outputting, by the voltage measurement unit, the voltage to the lower peak hold circuit and the microcontroller, and
the upper peak hold circuit outputs the maximum current value to the microcontroller at the regular time intervals and the lower peak hold circuit outputs the minimum voltage value to the microcontroller at the regular time intervals; and

resetting, by the microcontroller, the upper peak hold circuit and the lower peak hold circuit at the regular time intervals.

Assignees

• Murata Manufacturing Co

Inventors

• Shimura Jusuke
• Kamitani Gaku

Classifications

• H02J7/977

  of the battery · CPC title

• H02J7/96

  in response to battery voltage · CPC title

• H02J7/94

  in response to battery current · CPC title

• H02J7/65

  against overtemperature · CPC title

• G01R31/367 Primary

  Software therefor, e.g. for battery testing using modelling or look-up tables · CPC title