Sanyo Electric Co., Ltd.

Nobuyoshi Oi

Masao Inoue

Tadashi Ise

Takeo Hamamatsu

Yasushi Kuroda

Hiroshi Sato

Takashi Nagase

Hirofumi Sako

Satoru Kometani

A rectangular battery having an electrode group which is inserted in a battery case having an airtight structure. The electrode group is formed by alternately stacking positive electrodes and negative electrodes via separators. The battery case is rectangular had has a closed bottom and an open part that is airtightly sealed by a cover. The outermost electrodes, which are located on both faces of the electrode group, are coated with an active material on a surface of a core. Furthermore, the outermost electrodes have the same polarity and the cores thereof directly contact an inside surface of the outer battery case. In one embodiment, the capacity of the outermost electrodes is smaller than the capacity of the inwardly disposed electrodes of the same polarity.

Rectangular battery

Growing community of inventors

Tokushima, Japan

Nobuyoshi Oi