Method and apparatus for controlling temperature of battery pack, battery management system and storage medium

1. A method for controlling a temperature of a battery pack, comprising:

detecting a SOC of the battery pack;

determining a SOC interval in which the SOC is located from a plurality of preset SOC intervals;

determining a target temperature threshold corresponding to the SOC interval under a condition that a preset battery pack life requirement is met, based on a mapping relationship between preset SOC intervals, target temperature thresholds and battery pack life; and

performing thermal management on the battery pack based on the target temperature threshold;

wherein the performing thermal management on the battery pack based on the target temperature threshold comprises:

cooling the battery pack based on the target temperature threshold.

2. The method according to claim 1 , wherein before the determining a target temperature threshold corresponding to the SOC interval, based on a mapping relationship between preset SOC intervals, target temperature thresholds and battery pack life, the method further comprises:

determining a mapping relationship of battery pack life with average battery pack SOC values and average battery pack temperature values, based on historical SOC data and historical temperature data of a plurality of battery packs meeting the preset battery pack life requirement;

determining an average temperature value interval corresponding to each SOC interval of the plurality of preset SOC intervals under the condition that the preset battery pack life requirement is met, based on the mapping relationship of battery pack life with average battery pack SOC values and average battery pack temperature values; and

determining a minimum temperature in the average temperature value interval corresponding to each SOC interval of the plurality of preset SOC intervals as a target temperature threshold corresponding to the respective SOC interval, so that the mapping relationship between preset SOC intervals, target temperature thresholds and battery pack life is obtained.

3. The method according to claim 2 , wherein the determining a mapping relationship of battery pack life with average battery pack SOC values and average battery pack temperature values, based on historical SOC data and historical temperature data of a plurality of battery packs meeting the preset battery pack life requirement specifically comprises:

calculating an average value of historical SOC data and an average value of historical temperature data of each battery pack of the plurality of battery packs meeting the preset battery pack life requirement, to obtain an average SOC value and an average temperature value of each battery pack of the plurality of battery packs; and

obtaining the mapping relationship of battery pack life with average battery pack SOC values and average battery pack temperature values, based on the average SOC value and the average temperature value of each battery pack of the plurality of battery pack.

4. The method according to claim 1 , wherein before the determining a SOC interval in which the SOC is located from a plurality of preset SOC intervals, the method further comprises:

acquiring historical SOC data of a plurality of battery packs with different battery life;

calculating an average value of historical SOC data of each battery pack of the plurality of battery packs, to obtain an average SOC value of each battery pack of the plurality of battery packs;

determining a mapping relationship between average battery pack SOC values and battery pack capacity retention ratios, based on the average SOC value of each battery pack and a capacity retention ratio of each battery pack at the end of life of the battery pack; and

determining the plurality of preset SOC intervals, based on the mapping relationship between average battery pack SOC values and battery pack capacity retention ratios.

5. The method according to claim 4 , wherein the determining the plurality of preset SOC intervals, based on the mapping relationship between average battery pack SOC values and battery pack capacity retention ratios specifically comprises:

obtaining a variation curve of battery pack capacity retention ratio versus average SOC value, based on the mapping relationship between average battery pack SOC values and battery pack capacity retention ratios;

acquiring a SOC interval point on the variation curve of battery pack capacity retention ratio versus average SOC value, wherein a slope change rate of the variation curve of battery pack capacity retention ratio versus average SOC value at the SOC interval point is greater than a preset change threshold;

dividing, based on the SOC interval point, the variation curve of battery pack capacity retention ratio versus average SOC value into a plurality of curve segments; and

determining a plurality of SOC intervals corresponding to the plurality of curve segments as the plurality of preset SOC intervals.

6. The method according to claim 1 , wherein the cooling the battery pack specifically comprises:

determining a cooling-enabling threshold corresponding to the SOC interval, wherein the cooling-enabling threshold is greater than or equal to the target temperature threshold corresponding to the SOC interval;

enabling cooling of the battery pack, when the temperature of the battery pack is greater than or equal to the cooling-enabling threshold and an electric vehicle where the battery pack is located is in a working state;

disabling the cooling of the battery pack, when the temperature of the battery pack is less than the cooling-enabling threshold; and

disabling the cooling of the battery pack, when the electric vehicle where the battery pack is located is in an off-working state.

7. The method according to claim 6 , wherein after the enabling cooling of the battery pack, the method further comprises:

determining a cooling-disabling threshold corresponding to the SOC interval, wherein the cooling-disabling threshold is less than the target temperature threshold corresponding to the SOC interval;

disabling the cooling of the battery pack, when the temperature of the battery pack is less than the cooling-disabling threshold;

or,

acquiring an ambient temperature value of the battery pack;

disabling the cooling of the battery pack, when the temperature of the battery pack is less than a larger one of the cooling-disabling threshold and the ambient temperature value.

8. The method according to claim 1 , wherein the plurality of preset SOC intervals comprise:

an interval A corresponding to a SOC range from 0% to 60%;

an interval B corresponding to a SOC range from 60% to 70%;

an interval C corresponding to a SOC range from 70% to 80%; and

an interval D corresponding to a SOC range from 80% to 100%.

9. The method according to claim 8 , wherein

a target temperature threshold corresponding to the interval A is T C1 ranging from 43° C. to 47° C.;

a target temperature threshold corresponding to the interval B is T C2 ranging from 39° C. to 43° C.;

a target temperature threshold corresponding to the interval C is T C3 ranging from 29° C. to 39° C.; and

a target temperature threshold corresponding to the interval D is T C4 ranging from 27° C. to 29° C.

10. An apparatus for controlling a temperature of a battery pack, comprising:

a detecting module configured to detect a SOC of the battery pack;

a first determining module configured to determine a SOC interval in which the SOC is located from a plurality of preset SOC intervals;

a second determining module configured to determine a target temperature threshold corresponding to the SOC interval under a condition that a preset battery pack life requirement is met, based on a mapping relationship between preset SOC intervals, target temperature thresholds and battery pack life; and

a thermal managing module configured to perform thermal management on the battery pack based on the target temperature threshold;

wherein the thermal managing module is specifically configured to cool the battery pack based on the target temperature threshold.

11. A battery management system comprising a processor, a memory, and a computer program stored on the memory and executable on the processor, wherein the computer program when being executed by the processor implements the method for controlling the temperature of the battery pack according to claim 1 .

12. A computer-readable storage medium having a computer program is stored thereon, wherein the computer program, when being executed by a processor, implements the method for controlling the temperature of the battery pack according to claim 1 .