Kabushiki Kaisha Toshiba

Naoki Isooka

Naoki Tashiro

Hironori Ito

Shigeru Sekine

Shizuo Morioka

Masahiko Kasashima

Hisao Tsukazawa

Masayasu Tanaka

Katsuo Ozawa

Nobuyuki Hosoya

Yoshiaki Ukiya

Masaru Harashima

Akihiko Uchida

Hirohito Motomiya

Keiichi Mitsui

Masahiko Hagiwara

Yuichiro Hino

Masanori Morita

A battery charge circuit using a constant voltage/constant current to power charge a plurality of battery packs, a current detection circuit to detect a charge current according to a predetermined value, and control mechanisms to maintain a constant voltage charge mode when the charge current value drops below a set value within the battery pack.

Battery set structure and charge/discharge control apparatus for

In a battery-driven portable computer, a battery pack is constituted by m battery sets connected in series each including n lithium-ion secondary battery cells connected in parallel. A voltage monitor for monitoring the voltage of the terminal electrode of each battery set and a charger for independently appropriately charging each battery set in accordance with a monitor result are arranged, thereby realizing battery driving by a lithium-ion secondary battery pack having a large capacity. A computer system monitors the voltages of the battery cells which are part of a secondary battery by comparing the battery voltages with a predetermined voltage value in order to detect overdischarge (undervoltage) or overcharge (overvoltage), outputs this information outside of the battery pack, and terminates processing prior to a circuit disconnect.

Growing community of inventors

Tokyo, Japan

Naoki Isooka