Matsushita Electric Industrial Co., Ltd.

Daisuke Yoshida

Fumio Daio

Akihiro Sano

Yasushi Hirakawa

Takayuki Aoi

Takeshi Inui

Susumu Yamanaka

Takao Uyama

Toshihiko Izumikawa

Yukihiro Gotanda

Takae Okazaki

A coin-shaped battery includes a cathode case ( ) having a crimp portion ( ) in the periphery of a bottom face ( ), and an anode cap ( ) having a flange ( ) with an extended portion ( ) and a turn-up portion ( ). Openings of cathode case ( ) and the anode cap ( ) are sealed by crimping with a gasket ( ) interposed therebetween, so that the gasket ( ) is compressed between the crimp portion ( ) having a U-shaped cross section, the flange ( ), the extended portion ( ) and the turn-up portion ( ) to effect reliable sealing. Thus, it is possible to disperse a deformation pressure, which is generated by bulge of the cathode case ( ) and the anode cap ( ) caused with a rise in internal pressure of the battery under severe working conditions such as use under a high temperature. As a result, the coin-shaped battery having improved liquid leakage resistance in the crimped portion is provided.

Coin-shaped battery

A method of attaching a battery cell in an apparatus acted upon by centrifugal force avoids an extreme decline in discharge capacity of the battery cell when acted upon by the centrifugal force. The battery, of the type including a positive polarity material and a negative polarity material which are placed in opposition in a thickness direction of a battery case with an intervening separator disposed therebetween, and a liquid electrolyte packed inside the battery case, is mounted in the apparatus, oriented such that a negative polarity material side of the battery cell faces generally in a direction in which the centrifugal force acts on the apparatus, and an angle of inclination of a thickness direction of the battery cell is within a range of 0 to about 60 degrees relative to the direction of the centrifugal force.

Method and device for mounting cell

A plurality of cells are disposed in close contact with each other with their longitudinal axes parallel to each other, and their electrode terminals that are juxtaposed at one end are electrically connected to each other with a connector piece. These cells thus joined together are inserted into and held within a frame body formed in one-piece with a pair of end face covers, connecting bar, and retaining piece, or alternatively, inserted into and held within a cell casing having a pair of end face covers, bottom wall, and partition boss formed integrally therewith.

Battery pack

A battery cell is attached in an apparatus loaded in a revolving body, etc., such that the negative electrode side of the battery cell is oriented, within a prescribed angular range, in the direction in which centrifugal force acts.

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Moriguchi, Japan

Daisuke Yoshida