Battery management system wake-up method, battery management system wake-up apparatus, and storage medium

Patent metadata

Field	Value
Publication number	US-11817563-B2
Application number	US-202217864676-A
Country	US
Kind code	B2
Filing date	Jul 14, 2022
Priority date	Jul 14, 2021
Publication date	Nov 14, 2023
Grant date	Nov 14, 2023

Abstract

Embodiments of this application provide a battery management system (BMS) wake-up method, a BMS wake-up apparatus, and a storage medium, and pertains to the field of battery safety technologies. In this application, before a BMS hibernates, a wake-up threshold corresponding to first sampling information is determined based on an obtained extremum of the first sampling information of a battery cell. After the BMS hibernates, a sampling chip collects second sampling information of the battery cell when the BMS is hibernating, and transmits a wake-up signal to the BMS when it is determined that the second sampling information of the battery cell reaches the wake-up threshold. In this way, the BMS can be woken up in a timely manner by the wake-up signal, and therefore the BMS can find battery safety problems in a timely manner.

First claim

What is claimed is:

1 . A battery management system (BMS) wake-up method, comprising:
before a BMS hibernates, obtaining a first sampling voltage of a battery cell that is collected by a sampling chip, and determining, based on an extremum of the first sampling voltage, a wake-up threshold, wherein the wake-up threshold is used for the sampling chip to wake up the BMS when the BMS is hibernating; and when the BMS is hibernating, receiving a BMS wake-up signal transmitted by the sampling chip and waking up the BMS, wherein the BMS wake-up signal is transmitted by the sampling chip when it is determined that a sampling value of a second sampling voltage of the battery cell reaches the wake-up threshold, and the second sampling voltage of the battery cell is collected by the sampling chip when the BMS is hibernating; wherein determining, based on the extremum of the first sampling voltage, the weak-up threshold comprises:
determining the extremum of the first sampling voltage as a target voltage; and
determining, based on the target voltage and a voltage threshold, the wake-up threshold.

2 . The method according to claim 1 , wherein the wake-up threshold is a first abnormal voltage threshold, and determining, based on the extremum of the first sampling voltage, the wake-up threshold comprises:
determining a minimum of the first sampling voltage as a first target voltage; and determining, based on the first target voltage and a first voltage threshold, the first abnormal voltage threshold.

3 . The method according to claim 2 , wherein the first voltage threshold comprises a voltage down-regulation threshold, and determining, based on the first target voltage and the first voltage threshold, the first abnormal voltage threshold comprises:
determining a difference between the first target voltage and the voltage down-regulation threshold as the first abnormal voltage threshold.

4 . The method according to claim 2 , wherein the first voltage threshold comprises a voltage down-regulation threshold and a battery cell undervoltage class 2 threshold, and determining, based on the first target voltage and the first voltage threshold, the first abnormal voltage threshold comprises:
determining a larger one of the battery cell undervoltage class 2 threshold and a difference between the first target voltage value and the voltage down-regulation threshold as the first abnormal voltage threshold.

5 . The method according to claim 1 , wherein the wake-up threshold is a second abnormal voltage threshold, and determining, based on the extremum of the first sampling voltage, the wake-up threshold comprises:
determining a maximum of the first sampling voltage as a second target voltage; and determining, based on the second target voltage and a second voltage threshold, the second abnormal voltage threshold.

6 . The method according to claim 5 , wherein the second voltage threshold comprises a voltage up-regulation threshold, and determining, based on the second target voltage and the second voltage threshold, the second abnormal voltage threshold comprises:
determining a sum of the second target voltage and the voltage up-regulation threshold as the second abnormal voltage threshold.

7 . The method according to claim 5 , wherein the second voltage threshold comprises a first voltage up-regulation threshold, a battery cell full charge voltage and a second voltage up-regulation threshold, and determining, based on the second target voltage and the second voltage threshold, the second abnormal voltage threshold comprises:
determining a smaller one of a sum of the second target voltage and the first voltage up-regulation threshold, and a sum of the battery cell full charge voltage and the second voltage up-regulation threshold as the second abnormal voltage threshold.

8 . A battery management system (BMS) wake-up apparatus, comprising:
a determining module, configured to obtain, before a BMS hibernates, a first sampling voltage of a battery cell that is collected by a sampling chip, and determine, based on an extremum of the first sampling voltage, a wake-up threshold, wherein the wake-up threshold is used for the sampling chip to wake up the BMS when the BMS is hibernating; and a wake-up signal receiving module, configured to receive, when the BMS is hibernating, a BMS wake-up signal transmitted by the sampling chip and wake up the BMS, wherein the BMS wake-up signal is transmitted by the sampling chip when it is determined that a sampling value of a second sampling voltage of the battery cell reaches the wake-up threshold, and the second sampling voltage of the battery cell is collected by the sampling chip when the BMS is hibernating; wherein in determining, based on the extremum of the first sampling voltage, the weak-up threshold, the determining module is configured to:
determine the extremum of the first sampling voltage as a target voltage; and
determine, based on the target voltage and a voltage threshold, the wake-up threshold.

9 . The apparatus according to claim 8 , wherein the wake-up threshold is a first abnormal voltage threshold, and in determining, based on the extremum of the first sampling voltage, the wake-up threshold, the determining module is configured to:
determine a minimum of the first sampling voltage as a first target voltage; and determine, based on the first target voltage and a first voltage threshold, the first abnormal voltage threshold.

10 . The apparatus according to claim 9 , wherein the first voltage threshold comprises a voltage down-regulation threshold, and in determining, based on the first target voltage and the first voltage threshold, the first abnormal voltage threshold, the determining module is configured to:
determine a difference between the first target voltage and the voltage down-regulation threshold as the first abnormal voltage threshold.

11 . The apparatus according to claim 9 , wherein the first voltage threshold comprises a voltage down-regulation threshold and a battery cell undervoltage class 2 threshold, and in determining, based on the first target voltage and the first voltage threshold, the first abnormal voltage threshold, the determining module is configured to:
determine a larger one of the battery cell undervoltage class 2 threshold and a difference between the first target voltage value and the voltage down-regulation threshold as the first abnormal voltage threshold.

12 . The apparatus according to claim 8 , wherein the wake-up threshold is a second abnormal voltage threshold, and in determining, based on the extremum of the first sampling voltage, the wake-up threshold, the determining module is configured to:
determine a maximum of the first sampling voltage as a second target voltage; and determine, based on the second target voltage value and a second voltage threshold, the second abnormal voltage threshold.

13 . The apparatus according to claim 12 , wherein the second voltage threshold comprises a voltage up-regulation threshold, and in determining, based on the second target voltage and the second voltage threshold, the second abnormal voltage threshold, the determining module is configured to:
determine a sum of the second target voltage and the voltage up-regulation threshold as the second abnormal voltage threshold.

14 . The apparatus according to claim 12 , wherein the second voltage threshold comprises a first voltage up-regulation threshold, a battery cell full charge voltage and a second voltage up-regulation threshold, and in determining, based on the second target voltage and the second voltage threshold, the second a

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Jia Hui
• Zhan Xueyu
• Xie Jihai
• Yuan Yajie
• Wang Jinfu

Classifications

• H02J7/60

  including safety or protection arrangements · CPC title

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J7/65

  against overtemperature · CPC title

• H01M10/4285 Primary

  Testing apparatus · CPC title

• B60L58/10

  for monitoring or controlling batteries · CPC title