Patent ID: 11894527
Assignee: JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 9:
10. A battery cell self-discharge current detection apparatus, comprising:
a control and acquisition module for controlling a constant voltage source to start charging a battery cell at a first moment, and acquiring a first rate of change of a target current over time in a first preset duration after the first moment, wherein the target current is a total charging current to the battery cell;
a first control module for controlling, in the case where the first rate of change is greater than a first threshold value, a constant current source and the constant voltage source to charge the battery cell;
a first acquisition module for acquiring, in the case of reaching a second moment, a second rate of change of the target current over time in a second preset duration after the second moment, wherein the second moment is a moment when the time for charging the battery cell using the constant current source and the constant voltage source reaches a third preset duration; and
a first determination module for determining, in the case where the absolute value of the second rate of change is less than or equal to a second threshold value, a self-discharge current of the battery cell according to the target current at the second moment or the target current in a fourth preset duration after the second moment, wherein the first threshold value and the second threshold value are both greater than or equal to 0.