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

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 .