Patent ID: 8283878

Claim:
A battery storage device system that has a main battery storage device A and an auxiliary battery storage device B as power source, comprising: (1) the main battery storage device A that has high energy density relative to the auxiliary battery storage device B, the main battery storage device A having an output ability that is equal to or more than an output requirement necessary for the battery storage device system by a single output of the main battery storage device A in a temperature range of a predetermined temperature or more, and the output ability of the main battery storage device A being below the output requirement in a temperature range lower than the predetermined temperature; (2) the auxiliary battery storage device B that has high output density relative to the main battery storage device A, the auxiliary battery storage device B having the output ability that is equal to or more than the output requirement by a single output of the auxiliary battery storage device B or simultaneous outputs of the main battery storage device A and the auxiliary battery storage device B in the temperature range lower than the predetermined temperature; (3) a warm-up means for warming up the main battery storage device A to the predetermined temperature or more; (4) a warm-up monitoring means for monitoring a need for warm-up with respect to the main battery storage device A; (5) an operation mode switching means for selecting an operation mode from a warm-up operation mode and a normal operation mode and performing the selected operation mode, wherein the warm-up operation mode starts warm-up of the main battery storage device A and the single output of the auxiliary battery storage device B or the simultaneous outputs of the main battery storage device A and the auxiliary battery storage device B are performed while the warm-up being performed when the warm-up monitoring means determines that the warm-up of the main battery storage device A is required, and the normal operation mode stops the warm-up of the main battery storage device A and the single output of the main battery storage device A is performed when the warm-up monitoring means determines that the warm-up of the main battery storage device A is not required; and (6) an electricity supply system for supplying an electric power to an outside of the battery storage device system, the electric power being obtained by the single output of the auxiliary battery storage device B or the simultaneous outputs of the main battery storage device A and the auxiliary battery storage device B in the warm-up operation mode, or obtained by the single output of the main battery storage device A in the normal operation mode.