Patent ID: 11940501
Assignee: LG ENERGY SOLUTION, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H  Y | IPC G  H

Claim 0:
1. A method for diagnosing low voltage failure of a secondary battery cell, the method comprising:
pre-aging a battery cell;
charging the battery cell to have a preset voltage according to a preset charging condition, wherein the preset voltage is set to a voltage of which a voltage change rate with respect to a state of charge (SOC) is greater than or equal to a preset reference value;
measuring a parameter for determining the low voltage failure of the battery cell;
comparing the measured parameter with a reference parameter to determine whether the battery cell is normal; and
subjecting the pre-aged battery cell to a subsequent charging under a predetermined voltage condition when the battery cell is determined to be normal, wherein the subsequent charging is an initial charging of a formation process.