To provide a power storage element of high volume capacity density, which can reduce a generation rate of a short circuit generated between a lead tab for a terminal of an electrode having a narrow area and an electrode having a wide area.
The power storage element is constituted: to bring a shift amount α between a side part 6c on which an edge part 6b is formed out of the side parts 6c, 6d of a positive electrode-forming face 6a and a side part 7c positioned between a side part 6c and a lead tab 8 for a positive electrode terminal out of the side parts 7c, 7d of a negative electrode-forming face 7a in parallel to the side part 6c, into 0 mm or more to 3 mm or less; to bring the shortest distance X from one end part of the lead tab 8 for the positive electrode terminal up to the side part 7c of the negative electrode-forming face 7a positioned between the side part 6c of the positive electrode-forming face 6a formed with the edge part 6b and the lead tab 8f or the positive electrode terminal, into 0.5 mm or more to 5.0 mm or less; and to bring the shortest distance Y from one end part of a lead tab 9 for a negative electrode terminal up to the side part 6c of the positive electrode-forming face 6a positioned between the side part 7c of the negative electrode-forming face 7a formed with the edge part 7b and the lead tab 9 for the negative electrode terminal, into 0.5+α mm or more to 5.0+α mm or less.
COPYRIGHT: (C)2010,JPO&INPIT
Takahiro Yamamoto
Toshio Tsubata
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Yoshiaki Naito
Hide Tanaka Tetsu