| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a laminated outer package-type power storage device capable of preventing the burst due to increase in internal pressure and controlling the ejection direction of gas and an electrolyte without causing cost increase while maintaining its external dimension and electrical performance. <P>SOLUTION: A laminate 50 of sheet-like electrodes (10p,10n) and an electrolyte 51 are sealed in an outer package 100 in which the circumferences of two films (100a,100b) are bonded together in a frame-like adhesion region 60, and the adhesion region includes an internal pressure release part 70 and an internal pressure guide path 71 opening in the circumference of the outer package. A distance Wa from an inner periphery 61 to an outer periphery 62 in the frame-like adhesion region is longer than a distance Wc to a site 64 nearest to the inner periphery between the inner periphery and the internal pressure guide path, and the distance Wc is longer than a distance Wb to a site 63 nearest to the inner periphery between the inner periphery of the adhesion region and the internal pressure release part, and as the inner periphery of the adhesion region retreats to the side of the outer periphery at the time of internal pressure rising, the internal pressure release part communicates with the inner periphery and the internal pressure is released from an opening 72 of the internal pressure guide path. <P>COPYRIGHT: (C)2012,JPO&INPIT |
