Battery controller and method for suppression of lithium plating during charging

Patent metadata

Field	Value
Publication number	US-11909244-B2
Application number	US-202117365362-A
Country	US
Kind code	B2
Filing date	Jul 1, 2021
Priority date	Feb 9, 2021
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

Disclosed are a battery charging method, a controller, a battery management system, a battery, and an electric device, aimed to suppress lithium plating of the battery. The battery charging method includes: obtaining an electrical parameter of a battery; determining whether the electrical parameter of the battery reaches a preset threshold, where a value range of the preset threshold meets the following condition: a battery state of charge (SOC) corresponding to the preset threshold is 70% to 80%; suspending, when the electrical parameter of the battery reaches the preset threshold, charging of the battery and discharging the battery for a duration of t; and continuing to charge the battery when the discharge is completed.

First claim

What is claimed is:

1. A battery charging method, comprising:
performing a charging process on a battery; and
monitoring an electrical parameter of the battery during the charging process; wherein the charging process consists of the following steps:
when the electrical parameter of the battery reaches a first threshold, suspending charging of the battery and discharging the battery by applying a first negative pulse for a first duration of t 1 ;
continuing to charge the battery after discharging the battery for the first duration of t 1 ;
when the electrical parameter of the battery reaches a second threshold, suspending charging of the battery and discharging the battery by applying a second negative pulse for a second duration of t 2 ; and
continuing to charge the battery after discharging the battery for the second duration of t 2 ;

wherein the first duration t 1 is greater than or equal to 3 seconds and less than 13 seconds, the second duration t 2 is greater than 3 seconds and less than or equal to 13 seconds, and t 1 is less than t 2 ; and
wherein the electrical parameter is state of charge (SOC), and the first threshold is lower than the second threshold.

2. The battery charging method according to claim 1 , wherein a negative electrode material of the battery comprises graphite.

3. The battery charging method according to claim 1 , wherein
the first threshold is an SOC of 35% to 45%; and
the second threshold is an SOC of 70% to 80%.

4. The battery charging method according to claim 1 , wherein the method further comprises:
determining whether the electrical parameter of the battery meets a charge stop condition; and
stopping charging of the battery when the electrical parameter of the battery meets the charge stop condition.

5. A battery charging controller, comprising one or more processors, wherein the processors work individually or jointly, and the processors are configured to:
perform a charging process on a battery; and
monitor an electrical parameter of the battery during the charging process;

wherein the charging process consists of the following steps:
when the electrical parameter of the battery reaches a first threshold, suspending charging of the battery and discharging the battery by applying a first negative pulse for a first duration of t 1 ;
continuing to charge the battery after discharging the battery for the first duration of t 1 ;
when the electrical parameter of the battery reaches a second threshold, suspending charging of the battery and discharging the battery by applying a second negative pulse for a second duration of t 2 ; and
continuing to charge the battery after discharging the battery for the second duration of t 2 ;

wherein the first duration t 1 is greater than or equal to 3 seconds and less than 13 seconds, the second duration t 2 is greater than 3 seconds and less than or equal to 13 seconds, and t 1 is less than t 2 ; and
wherein the electrical parameter is state of charge (SOC), and the first threshold is lower than the second threshold.

6. The battery charging controller according to claim 5 , wherein a negative electrode material of the battery comprises graphite.

7. The battery charging controller according to claim 5 , wherein
the first threshold is an SOC of 35% to 45%; and
the second threshold is an SOC of 70% to 80%.

8. The battery charging controller according to claim 5 , wherein the processors are further configured to:
determine whether the electrical parameter of the battery meets a charge stop condition;
stop charging of the battery when the electrical parameter of the battery meets the charge stop condition.

9. A battery management system, comprising:
at least one processor; and
a memory coupled to the at least one processor,
wherein the memory stores an instruction executable by the at least one processor, and when the instruction is executed by the at least one processor, the at least one processor is configured to:
perform a charging process on a battery; and
monitor an electrical parameter of the battery during the charging process;
wherein the charging process consists of the following steps:
when the electrical parameter of the battery reaches a first threshold, suspending charging of the battery and discharging the battery by applying a first negative pulse for a first duration of t1;
continuing to charge the battery after discharging the battery for the first duration of t1;
when the electrical parameter of the battery reaches a second threshold, suspending charging of the battery and discharging the battery by applying a second negative pulse for a second duration of t2; and
continuing to charge the battery after discharging the battery for the second duration of t2;

wherein the first duration t 1 is greater than or equal to 3 seconds and less than 13 seconds, the second duration t 2 is greater than 3 seconds and less than or equal to 13 seconds, and t 1 is less than t 2 ; and
wherein the electrical parameter is state of charge (SOC), and the first threshold is lower than the second threshold.

10. The battery management system according to claim 9 , wherein a negative electrode material of the battery comprises graphite.

11. The battery management system according to claim 9 , wherein
the first threshold is an SOC of 35% to 45%; and
the second threshold is an SOC of 70% to 80%.

12. The battery management system according to claim 9 , wherein the at least one processor is further configured to:
determine whether the electrical parameter of the battery meets a charge stop condition; and
stop charging of the battery when the electrical parameter of the battery meets the charge stop condition.

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Li Haili

Classifications

• H02J2105/57

  according to a pre-established time schedule · CPC title

• H02J7/875

  Charging or discharging for charge maintenance, battery initiation or rejuvenation · CPC title

• H02J7/96

  in response to battery voltage · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/933 Primary

  the cycle being controlled or terminated in response to electric parameters · CPC title