Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Cell enclosure structure – e.g. – housing – casing – container,...
Reexamination Certificate
2005-08-16
2005-08-16
Ruthkosky, Mark (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Cell enclosure structure, e.g., housing, casing, container,...
C029S730000, C029S623100, C429S176000
Reexamination Certificate
active
06929880
ABSTRACT:
A prismatic battery case (3) has a configuration wherein a rectangular shorter-side plate (3a) has a thickness (A) larger than a thickness (B) of a longer-side plate (3b). When the prismatic battery case (3) is manufactured, a battery case material (8) punched into a predetermined shape undergoes deep drawing to form a first intermediate cup element (1) having a substantially elliptic cross section; the first intermediate cup element (1) undergoes redrawing successively in a plural stages to form a second intermediate cup element (2) having a substantially elliptic cross section which is smaller in minor-axis-diameter to major-axis-diameter ratio; and the second intermediate cup element (2) undergoes DI processing to form the prismatic battery case (3) having a substantially rectangular cross section wherein the thickness (A) of the shorter-side plate (3a) is made larger than the thickness (B) of the longer-side plate (3b).
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Kitaoka Susumu
Mori Katsuhiko
Tanaka Shigekazu
Yamashita Shoji
Ikkoseiko Co., Ltd.
Ruthkosky Mark
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