Sony Corporation

Makoto Kamoshida

Kazuo Yamazaki

Tamiji Nagai

Kuniharu Suzuki

Tamon Ikeda

Tadahisa Yamamoto

A battery pack BP having terminals T , T , and T , a detecting circuit, a signal generating circuit, a temperature, voltage, and current detecting circuit, a switching circuit, and a secondary battery connected to the switching circuit. A first external signal generating unit may be connected to terminals T and T and a second external signal generating unit may be connected to terminals T and T . The detecting circuit detects whether the first or second external signal generating units has been connected. In so doing, the detecting circuit may detect an impedance of the first external signal generating unit and may detect a terminal voltage of the second external signal generating unit. The on/off operations of the switching circuit SW may be controlled in accordance with the detection result.

Growing community of inventors

Tokyo, Japan

Makoto Kamoshida