Patent ID: 11874330
Assignee: LG ENERGY SOLUTION, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H  Y | IPC G  H

Claim 0:
1. A battery management apparatus, comprising:
a voltage sensor and a current sensor configured to measure a voltage and current of a battery cell, respectively, while the battery cell is being charged or discharged, for a plurality of charging and discharging cycles of the battery cell;
a control unit configured to estimate, for each charging and discharging cycle, a capacity of the battery cell based on the measured current of the battery cell during the charging and discharging cycle; and
memory configured to store:
a respective capacity-voltage differential profile generated based on the measured voltage of the battery cell and the corresponding estimated capacity of the battery cell for each charging and discharging cycle; and
a respective charging and discharging current rate (C-rate) for each charging and discharging cycle,

wherein the control unit is configured to:
generate a subset of the plurality of charging and discharging cycles having a common charging and discharging C-rate; and
diagnose a state of the battery cell based on a comparison of capacity-voltage differential profiles of the subset of charging and discharging cycles with each other.