Patent ID: 8566049

Claim:
A battery system comprising: a first battery cell; and a first management unit which is connected in one-to-one correspondence to the first battery cell, wherein the first management unit at least includes: a first parameter acquiring unit which acquires a power consumption parameter of the first battery cell; a first calculating unit which calculates a power consumption state value of the first battery cell on the basis of the power consumption parameter acquired by the first parameter acquiring unit; a first storage unit which stores the power consumption state value calculated by the first calculating unit; a power load which moves by electric power supplied from the first battery cell; and a start time acquiring unit which times start time of the power load, wherein the first calculating unit which calculates the power consumption state value using at least two power consumption parameters among temperature of the first battery cell, a current value input to the first battery cell, a current value output from the first battery cell, and operating time of the power load, as power consumption parameters.