Method, apparatus, and device for charging a battery and storage medium

Patent metadata

Field	Value
Publication number	US-10965138-B2
Application number	US-202016919109-A
Country	US
Kind code	B2
Filing date	Jul 2, 2020
Priority date	Sep 27, 2017
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

The present disclosure provides a method, apparatus, and device for charging a battery, and storage medium. The method for charging a battery includes acquiring a battery temperature; determining a charging current value In for the nth charging stage of the battery, according to the battery temperature and a mapping relationship between different temperature ranges and charging current values I, wherein a preset charging cut-off voltage value Vn for the nth charging stage is greater than Vn−1; charging the battery with Ij in the jth charging stage; acquiring a voltage value of the battery at the current time; if the voltage value is less than Vj, continuing to charge the battery with Ij; if the voltage value is not less than Vj and j<N, charging the battery with Ij+1; if the voltage value is not less than Vj and j=N, stopping charging the battery.

First claim

What is claimed is:

1. A method for charging a battery, comprising:
acquiring a first voltage value of the battery, the first voltage value is a voltage value of the battery before charging;
determining a charging cut-off voltage value V j corresponding to the first voltage value;
determining a charging cut-off current value I j corresponding to the charging cut-off voltage value;
charging the battery with I j ;
in a j th charging stage, wherein 1 j N, and N is a total number of charging stages,
acquiring a second voltage value of the battery at current time;
charging the battery with I j+1 if the second voltage value is not less than V j and j<N; and

wherein determining the charging cut-off current value I j further comprises:
acquiring a battery temperature of the battery;
determining the charging cut-off current value I j according to the acquired battery temperature, the charging cut-off voltage value V j and a preset mapping relationship, wherein the preset mapping relationship comprises a correspondence relationship among charging cut-off voltage values, different temperature ranges and charging cut-off current values.

2. The method of claim 1 , wherein determining the charging cut-off voltage value V j further comprises:
selecting a charging cut-off voltage value in a plurality of charging cut-off voltage values that is greater than the first voltage value and has a smallest difference from the first voltage value.

3. The method of claim 1 , further comprising:
continuing to charge the battery with I j if the second voltage value is less than V j .

4. The method of claim 1 , further comprising:
stopping charging the battery if the second voltage value is not less than V j and j=N.

5. The method of claim 1 , wherein before determining the charging cut-off current value I j , the method further comprises:
setting the correspondence relationship among the charging cut-off voltage values, the different temperature ranges and the charging cut-off current values.

6. The method of claim 5 , wherein setting the correspondence relationship among the charging cut-off voltage values, the different temperature ranges and the charging cut-off current values comprises:
setting charging cut-off voltage values V;
dividing the V into charging cut-off voltage intervals, wherein a minimum voltage value for a n th interval of the charging cut-off voltages is V n−1 , and a maximum voltage value for the n th interval is V n , and a minimum voltage value for the 1 st interval is a preset lower limit voltage value;
determining charging cut-off current values for a n th charging stage for the different temperature ranges, according to the n th interval and the different temperature ranges;
establishing the correspondence relationship among the charging cut-off voltage values, the different temperature ranges and the charging cut-off current values.

7. The method of claim 1 , wherein determining the charging cut-off current value I j according to the acquired battery temperature, the charging cut-off voltage value V j and the preset mapping relationship comprises:
determining a temperature range in which the battery temperature is located;
determining the charging cut-off current value I j according to the temperature range, the charging cut-off voltage value V j and the preset mapping relationship.

8. The method of claim 1 , wherein charging the battery with I j+1 comprises:
charging the battery with I j+1 after controlling I j to change to I j+1 at a predetermined rate.

9. The method of claim 1 , wherein the battery comprises a nickel cobalt manganese power storage unit.

10. An apparatus for charging a battery, comprising:
a processor;
a memory for storing processor-executable program codes; and
wherein the processor is configured to:
acquire a first voltage value of the battery, the first voltage value is a voltage value of the battery before charging;
determine a charging cut-off voltage value V j corresponding to the first voltage value;
determine a charging cut-off current value I j corresponding to the charging cut-off voltage value;
charge the battery with I j ;
in a j th charging stage, wherein 1 j N, and N is a total number of charging stages,
acquire a second voltage value of the battery at current time;
charge the battery with I j+1 if the second voltage value is not less than V j and j<N; and

wherein the processor is further configured to:
acquire a battery temperature of the battery;
determine the charging cut-off current value I j according to the acquired battery temperature, the charging cut-off voltage value V j and a preset mapping relationship, wherein the preset mapping relationship comprises a correspondence relationship among charging cut-off voltage values, different temperature ranges and charging cut-off current values.

11. The apparatus of claim 10 , wherein the processor is further configured to:
select a charging cut-off voltage value in a plurality of charging cut-off voltage values that is greater than the first voltage value and has a smallest difference from the first voltage value.

12. The apparatus of claim 10 , wherein the processor is further configured to:
continue to charge the battery with I j if the second voltage value is less than V j .

13. The apparatus of claim 10 , wherein the processor is further configured to:
stop charging the battery if the second voltage value is not less than V j and j=N.

14. The apparatus of claim 10 , wherein the processor is further configured to:
set the correspondence relationship among the charging cut-off voltage values, the different temperature ranges and the charging cut-off current values.

15. The apparatus of claim 14 , wherein the processor is further configured to:
set charging cut-off voltage values V;
divide the V into charging cut-off voltage intervals, wherein a minimum voltage value for a n th interval of the charging cut-off voltages is V n−1 , and a maximum voltage value for the n th interval is V n , and a minimum voltage value for the 1 st interval is a preset lower limit voltage value;
determine charging cut-off current values for a n th charging stage for the different temperature ranges, according to the n th interval and the different temperature ranges;
establish the correspondence relationship among the charging cut-off voltage values, the different temperature ranges and the charging cut-off current values.

16. The apparatus of claim 10 , wherein the processor is further configured to:
determine a temperature range in which the battery temperature is located;
determine the charging cut-off current value I j according to the temperature range, the charging cut-off voltage value V j and the preset mapping relationship.

17. The apparatus of claim 10 , wherein the processor is further configured to:
charge the battery with I j+1 after controlling I j to change to I j+1 at a predetermined rate.

18. A computer-readable storage medium having computer instructions stored thereon which, when executed on a computer, cause the computer to perform the method for charging a battery of claim 1 .

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Du Xinxin
• Luo Fuping
• Wang Shengwei
• Fu Xin

Classifications

• H02J7/977

  of the battery · CPC title

• H02J7/975

  in response to temperature · CPC title

• H02J7/933

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

• H02J7/92 Primary

  with prioritisation of loads or sources · CPC title

• H01M10/486

  for measuring temperature · CPC title