Method, apparatus and system for controlling charging of a battery module

1. A method for controlling charging of a battery module, comprising:

acquiring an internal pressure value of the battery module during charging;

when determining the internal pressure value of the battery module increases from a first pressure threshold range to a second pressure threshold range, obtaining a second target charge cutoff voltage corresponding to the second target pressure threshold range;

controlling the battery module to be charged at a constant charging current until a voltage of the battery module reaches the second target charge cutoff voltage; and

controlling the battery module to be charged at the second target charge cutoff voltage until a current of the battery module reaches a predefined charge cutoff current,

wherein the first pressure threshold range and the second pressure threshold range are two adjacent pressure threshold ranges and are continuous and non-overlapping; and a first target charge cutoff voltage corresponding to the first pressure threshold range is larger than the second target charge cutoff voltage corresponding to the second pressure threshold range.

2. The method of claim 1 , wherein before controlling the battery module to be charged at a constant charging current until a voltage of the battery module reaches the second target charge cutoff voltage, the method further comprises:

controlling the battery module to rest for a first predetermined period of time.

3. The method of claim 1 , wherein the method further comprises:

controlling the battery module to be discharged at a constant discharging current until a voltage of the battery module reaches a predefined discharge cutoff voltage.

4. The method of claim 3 , wherein before controlling the battery module to be discharged at a constant discharging current until a voltage of the battery module reaches a predefined discharge cutoff voltage, the method further comprises:

controlling the battery module to rest for a second predetermined period of time.

5. The method of claim 1 , further comprising:

controlling the battery module to stop charging and discharging, when the internal pressure value of the battery module is larger than a maximum pressure threshold;

wherein the maximum pressure threshold is a maximum pressure value in a plurality of predefined pressure threshold ranges, wherein the plurality of predefined pressure threshold ranges at least comprises the first pressure threshold range and the second pressure threshold range.

6. The method of claim 1 , wherein the acquiring an internal pressure value of the battery module during charging comprises:

acquiring the internal pressure value of the battery module through sensing by at least one pressure sensor provided on each battery cell in the battery module and/or between two adjacent battery cells in the battery module.

7. A battery management system (BMS), wherein the BMS comprises a memory, a processor and a plurality of instructions stored in the memory that, when executed by the processor, cause the BMS to:

acquire an internal pressure value of the battery module during charging;

when determining the internal pressure value of the battery module increases from a first pressure threshold range to a second pressure threshold range, obtain a second target charge cutoff voltage corresponding to the second target pressure threshold range;

control the battery module to be charged at a constant charging current until a voltage of the battery module reaches the second target charge cutoff voltage; and

control the battery module to be charged at the second target charge cutoff voltage until a current of the battery module reaches a predefined charge cutoff current,

wherein the first pressure threshold range and the second pressure threshold range are two adjacent pressure threshold ranges and are continuous and non-overlapping; and a first target charge cutoff voltage corresponding to the first pressure threshold range is larger than the second target charge cutoff voltage corresponding to the second pressure threshold range.

8. The BMS of claim 7 , wherein the BMS is further configured to:

control the battery module to rest for a first predetermined period of time before controlling the battery module to be charged at a constant charging current until a voltage of the battery module reaches the second target charge cutoff voltage.

9. The BMS of claim 7 , wherein the BMS is further configured to:

control the battery module to be discharged at a constant discharging current until a voltage of the battery module reaches a predefined discharge cutoff voltage.

10. The BMS of claim 9 , wherein the BMS is further configured to:

control the battery module to rest for a second predetermined period of time before controlling the battery module to be discharged at a constant discharging current until a voltage of the battery module reaches a predefined discharge cutoff voltage.

11. The BMS of claim 7 , wherein the BMS is further configured to:

control the battery module to stop charging and discharging, when the internal pressure value of the battery module is larger than a maximum pressure threshold;

wherein the maximum pressure threshold is a maximum pressure value in a plurality of predefined pressure threshold ranges, wherein the plurality of predefined pressure threshold ranges at least comprises the first pressure threshold range and the second pressure threshold range.

12. The BMS of claim 7 , wherein the BMS is configured to:

acquire the internal pressure value of the battery module through sensing by at least one pressure sensor provided on each battery cell in the battery module and/or between two adjacent battery cells in the battery module.