Patent ID: 7928736

Claim:
A battery management system, comprising: a sensor for detecting a pack current and a pack voltage of a battery, the pack current of the battery including a charge current and a discharge current, the battery having only the discharge current during a discharge time period; a state of health measurer coupled to the sensor to receive the pack current and the pack voltage, and measuring a state of health of the battery from both of the pack current and the pack voltage; a state of charge measurer coupled to the sensor to receive the pack current; a total amount of charge determiner coupled to the state of charge measurer, the total amount of charge determiner obtaining a total amount of discharge accumulation by integrating the pack current of the battery only during the discharge time period, the total amount of charge determiner determining a total amount of charge from a relationship between the total amount of charge and the total amount of discharge accumulation, the total amount of charge determiner delivering the information of the total amount of charge to the state of charge measurer, the state of charge measurer measuring a state of charge from both of the pack current and the total amount of charge of the battery; and an output unit coupled to both of the state of health measurer and the state of charge measurer, and receiving the state of health and the state of charge.