Birch, Stewart, Kolasch & Birch, LLP
Battery comprising a flange formed at a peripheral edge and a protection circuit attached to the flange
A battery can 2 is composed of a can body 3 having a concave portion 31 for accommodating an electrode body 5, and a metal cover 4 for sealing an opening end of the concave portion 31 of the can body 3. The can body 3 is formed in a plate shape by subjecting a metal plate to shallow drawing. A flange 32 is provided at a peripheral edge portion of the opening end of the can body 3, which is bonded to be integrated with the metal cover 4 to keep an air-tight and liquid-tight state in the concave portion 31. 
Hitachi Maxell, Ltd.
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Masatoshi Osamu Yoshiki
Tanaka Watanabe Somatomo