Matsushita Electric Industrial Co., Ltd.

Junji Fujiwara

Katsumi Kozu

Takashi Takemura

Keisuke Tanaka

Ryoichi Kaiwa

Shoji Konishi

Shigeru Kajiwara

Tetsuo Hirabayashi

Shigeo Aoki

Motohide Masui

Yoshinori Koyanagi

A battery power source device including a plurality of rechargeable batteries ( ) having a laminated sheet as an outer case, and having extended positive and negative electrode leads of a metal foil is provided. A circuit board ( ) and a plurality of rechargeable batteries are positioned in a pack case ( ), a soldering land ( ) is formed in the extending direction of the positive and negative electrode leads ( ) and ( ) of the rechargeable batteries, and a circuit pattern formed on the circuit board allows the circuit board and the rechargeable batteries to be connected without applying force in the bending or distortional direction to the positive and negative electrode leads of a foil.

Battery power source device including rechargeable battery and circuit board joined thereto

A battery pack that reduces thickness and lightens weight as required for battery power sources of portable electronic equipment. A battery pack is constituted by accommodating a battery and battery protection device between a top case and bottom case forming a pack case. Since the battery is formed accommodated within an external casing wherein positive and negative electrode plates are formed by laminated sheet, reduced thickness and reduced weight of battery pack can be achieved. Also, since the face of bottom case opposite the battery is formed as a resiliently deformable face which is formed of small thickness, when expansion takes place such that the thickness of the battery as a whole increases, resiliently deformable face deforms maintaining a planar condition by resilient deformation, so that there is no possibility of an adverse effect on the equipment due to drum-shaped swelling being produced in battery pack, by such swelling.

Resiliently deformable battery pack

Growing community of inventors

Izumiotsu, Japan

Junji Fujiwara