Circuit control method, battery and its controller and management system, and electrical apparatus

Patent metadata

Field	Value
Publication number	US-11973364-B2
Application number	US-202318489021-A
Country	US
Kind code	B2
Filing date	Oct 18, 2023
Priority date	Sep 30, 2021
Publication date	Apr 30, 2024
Grant date	Apr 30, 2024

Abstract

Provided are a circuit control method, a battery controller, a battery management system, a battery, an electrical apparatus, and a vehicle. The circuit control method includes: acquiring an apparatus wake-up signal; determining whether a power source terminal voltage of a charging circuit of a battery on the apparatus is greater than a first threshold and whether a change rate in a first time length is less than a second threshold, wherein the charging circuit is a circuit connecting the battery on the apparatus and a generator, and the power source terminal voltage is an output voltage of the generator; and issuing a first instruction when the power source terminal voltage of the charging circuit of the battery on the apparatus is greater than the first threshold and the change rate in the first time length is less than the second threshold, so that the charging circuit is turned on.

First claim

The invention claimed is:

1. A circuit control method, comprising:
acquiring an apparatus wake-up signal;
determining whether a power source terminal voltage of a charging circuit of a battery on the apparatus is greater than a first threshold and whether a power source terminal voltage change rate in a first time length is less than a second threshold, wherein the charging circuit is a circuit connecting the battery on the apparatus and a generator, and the power source terminal voltage is an output voltage of the generator; and
issuing a first instruction when the power source terminal voltage of the charging circuit of the battery on the apparatus is greater than the first threshold and the power source terminal voltage change rate in the first time length is less than the second threshold, wherein the first instruction is used for controlling a first switch unit in the charging circuit to be closed, so that the charging circuit is turned on.

2. The method according to claim 1 , wherein the method further comprises:
determining whether a state of charge (SOC) of the battery is greater than a third threshold, whether the battery has a fault alarm, and whether a battery cell temperature of the battery is in a first range; and
issuing the first instruction when the power source terminal voltage of the charging circuit of the battery on the apparatus is greater than the first threshold and the terminal voltage change rate in the first time length is less than the second threshold, and further comprises:
issuing the first instruction when the power source terminal voltage of the charging circuit of the battery on the apparatus is greater than the first threshold, the power source terminal voltage change rate in the first time length is less than the second threshold, the SOC of the battery is greater than the third threshold, the battery has no fault alarm, and the battery cell temperature of the battery is in the first range.

3. The method according to claim 1 , wherein the method further comprises:
determining, after the charging circuit of the battery is turned on, whether a change rate of a charging current of the battery in a second time length is greater than a fourth threshold, or whether a voltage of the battery cell in the battery is greater than or equal to a fifth threshold, or whether the battery has a fault alarm, or whether the battery cell temperature is not in the first range; and
issuing a second instruction when the change rate of the charging current of the battery in the second time length is greater than the fourth threshold, or the voltage of the battery cell in the battery is greater than or equal to the fifth threshold, or the battery has a fault alarm, or the battery cell temperature is not in the first range, wherein the second instruction is used for controlling the first switch unit in the charging circuit to be turned off, so that the charging circuit is turned off.

4. The method according to claim 1 , wherein the method further comprises:
determining whether there is an apparatus wake-up signal and whether the power source terminal voltage is less than a sixth threshold; and
issuing a third instruction when there is an apparatus wake-up signal and the power source terminal voltage is lower than the sixth threshold, wherein the third instruction is for controlling the first switch unit in the charging circuit to be closed, so that the charging circuit is turned on, and the charging circuit is in a first turn-on state.

5. The method according to claim 4 , wherein the method further comprises:
determining whether the SOC of the battery is greater than a seventh threshold and whether the battery has a fault alarm; and
issuing the third instruction when there is an apparatus wake-up signal and the power source terminal voltage is less than the sixth threshold, and further comprises:
issuing the third instruction when there is an apparatus wake-up signal, the power source terminal voltage is less than the sixth threshold, the SOC of the battery is greater than the seventh threshold, and the battery has no fault alarm.

6. The method according to claim 5 , wherein the method further comprises:
determining, in the first turn-on state, whether a turn-on time of the charging circuit is greater than an eighth threshold; and
issuing a fourth instruction if the turn-on time of the charging circuit is greater than the eighth threshold, wherein the fourth instruction is used for controlling the first switch unit in the charging circuit to be turned off, so that the charging circuit is turned off.

7. The method according to claim 1 , wherein the method further comprises:
determining whether the SOC of the battery is greater than the seventh threshold; and
issuing a fifth instruction if the SOC of the battery is greater than the seventh threshold, wherein the fifth instruction is used for controlling a second switch unit in a discharging circuit of the battery to be closed, so that the discharging circuit is turned on, and the discharging circuit is a circuit connecting the battery on the apparatus and an electrical device.

8. The method according to claim 7 , wherein the method further comprises:
determining, after the discharging circuit of the battery is turned on, whether there is the apparatus wake-up signal, or whether the battery has a fault alarm, or whether the SOC of the battery is less than or equal to the seventh threshold; and
issuing a sixth instruction when there is the apparatus wake-up signal, or the battery has a fault alarm, or the SOC of the battery is less than or equal to the seventh threshold, wherein the sixth instruction is used for controlling the second switch unit in the discharging circuit to be turned off, so that the discharging circuit is turned off.

9. A battery controller , comprising: one or a plurality of processors working individually or jointly, the processors being used for performing the steps of the circuit control method according to claim 1 .

10. A battery management system, wherein:
at least one processor; and
a memory communicatively connected to the at least one processor; and, wherein
the memory stores instructions executable by the at least one processor, the instructions are executed by the at least one processor so that the at least one processor performs the steps of the circuit control method according to claim 1 .

11. A battery, comprising the battery management system according to claim 9 , or the battery management system according to claim 10 .

12. An electrical apparatus, comprising the battery according to claim 11 , wherein the battery is configured to provide electric energy.

13. A vehicle, comprising a lithium battery, a generator, and a vehicle wake-up switch; wherein the lithium battery is connected to the generator to form a charging circuit, the lithium battery comprises a battery management system, and the battery management system is used for:
acquiring a vehicle wake-up signal;
determining whether a power source terminal voltage of a charging circuit of the lithium battery on the vehicle is greater than a first threshold and whether a power source terminal voltage change rate in a first time length is less than a second threshold, wherein the charging circuit is a circuit connecting the lithium battery on the vehicle and the generator, and the power source terminal voltage is an output voltage of the generator; and
issuing a first instruction when the power source terminal voltage of the charging circuit of the battery on the vehicle is greater than the first threshold and the power source terminal voltage change rate in the first time length is less th

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Lu Fangyou
• Ma Hang
• Tian Wei
• Wang Xingchang
• Huang Zhenhui

Classifications

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/52

  for charge balancing, e.g. equalisation of charge between batteries · CPC title

• H02J7/96 Primary

  in response to battery voltage · CPC title

• H02J2105/33

  exchanging power with road vehicles · CPC title

• H02J7/977

  of the battery · CPC title