Koki Holdings Co., Ltd.

Naoto Wakatabe

Tomomasa Nishikawa

Nobuhiro Takano

Kazuhiko Funabashi

Hiroyuki Hanawa

Haruhisa Fujisawa

Akira Matsushita

Shinji Watanabe

Toshio Mizoguchi

Junichi Toukairin

Takuya Teranishi

Yasushi Nakano

Takuhiro Murakami

Masayuki Ogura

Takuya Yoshinari

Shota Kanno

Shota Takeuchi

Hayato Yamaguchi

Osamu Kawanobe

Jyun Enta

Masaru Hirano

Yusuke Funabiki

Junpei Sato

Hikaru Tamura

Takafumi Itoh

Takafumi Itho

A battery pack houses first and second cell units that are composed of a plurality of cells, and has a positive electrode power source terminal and a negative electrode power source terminal. This battery pack is provided with a series connector capable of connecting, in series, the first and second cell units and a parallel connector capable of connecting, in parallel, the first and second cell units, and is capable of switching between a parallel connection voltage and a series connection voltage. In the case of attachment to the high voltage electrical device body, the series connector becomes conductive and the parallel connector pair is cut off by the action of the series/parallel switching terminal. In the case of attachment to a low voltage electrical device body, the state is returned to an initial state, the series connector is cut off, and the parallel connector pair becomes conductive.

Battery pack, electrical device using battery pack, and electrical device system

In an upper cell unit () and a lower cell unit () comprising five battery cells, positive electrode terminals () are set apart and aligned vertically, and negative electrode terminals () are set apart and aligned vertically. When an electrical device body is rated at 36V, device-side terminals are in contact only at the upper terminals (), and short circuiting of the lower terminals () is effected using a short bar. When the electrical device body is rated at 18V, the upper and lower terminals (andand) are simultaneously made to contact the device-side terminals, and the upper cell unit () and the lower cell unit () assume a parallel connected state. Thus, it is possible to automatically switch the output voltage when a battery pack is mounted according to the difference in terminal shape on the electrical device body side.

Growing community of inventors

Ibaraki, Japan

Naoto Wakatabe