Hitachi Information & Telecommunication Engineering, Ltd.

Daisuke Ishida

Fumikazu Takahashi

Yoshihide Takahashi

Kimiaki Taniguchi

Akinori Uchida

Yusuke Katsuyama

Susumu Nagafuchi

A power storage system is provided with a battery and a battery charger which charges a battery pack having a battery voltage and current detection circuit. A charge circuit is structured such as to acquire terminal voltage information of the battery from a battery voltage detection circuit of the battery pack in a charging process, carry out a constant current charge control in a state in which the terminal voltage of the battery is equal to or lower than a previously determined reference voltage value of the battery, and switch to a constant voltage charge control maintaining the output voltage of the charge circuit in the case that the terminal voltage of the battery goes beyond the reference voltage value, thereby carrying on the charge until the battery is fully charged. Therefore, the power storage system can accurately charge the battery to a prescribed amount safely.

Power storage system with constant current charge control or constant voltage charge control depending on battery terminal voltage in a charging process

Growing community of inventors

Yokohama, Japan

Daisuke Ishida