Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Daisuke Sumimoto

Shinichi Kawaguchi

Toshihiko Ikehata

Mitsugu Okahisa

Touta Mizuta

Yukihiro Gotanda

Masahiko Yoshida

Disclosed is a flat-shaped battery including: a power generation element including a positive electrode, a negative electrode, a separator, and an electrolyte; a cylindrical case formed of a conductor, housing the power generation element, and having a circular bottom and a circular opening; a sealing plate formed of a conductor and closing the opening; an insulating member interposed between the case and the sealing plate; and a plate-shaped current collector disposed between the case and the positive electrode. The current collector is welded to the case and is in contact with the positive electrode. A welding point where the current collector is welded to the bottom is set so as to allow contact between the positive electrode and a center portion of the current collector to be maintained when the case is deformed such that a center portion of the bottom is displaced outward of the case.

Flat-shaped battery

A lithium primary battery including: a positive electrode containing a mixed crystalline manganese oxide; a negative electrode containing at least one selected from the group consisting of lithium and a lithium alloy; and a lithium-ion conductive non-aqueous electrolyte. The mixed crystalline manganese oxide contains at least &#x3bb;-type manganese oxide and &#x3b2;-type manganese oxide, and the &#x3b2;-type manganese oxide has a crystallinity of 300 to 500. The mixed crystalline manganese oxide preferably has a specific surface area of 0.5 to 4 m/g. The lithium alloy preferably contains at least aluminum in an amount of 0.2 wt % to 15 wt %.

Lithium primary battery

Growing community of inventors

Osaka, Japan

Daisuke Sumimoto