| abstract |
A battery element ( 2 ) includes a positive electrode and a negative electrode stacked via a separator. A collector portion ( 3 ) is formed by collectively bonding each of positive electrode plates and negative electrode plates which extend outward from this stacked region. Laminated films ( 5, 6 ) are obtained by laminating a thermally-fusible resin layer and a metal layer, and by sealing the battery element ( 2 ) and electrolyte by thermally fusing sealing portion ( 8 ) at a peripheral edge. A tab ( 4 ) is connected to collector portion ( 3 ) and extends outward from the laminated films ( 5, 6 ). An overlaying member ( 7 ) includes a protective region ( 7 d ) which protects the laminated films ( 5, 6 ) from corners ( 2 c ) of the battery element ( 2 ), corners ( 3 c ) of the collector portion ( 3 ) and corners ( 4 c ) of the tab ( 4 ), and a communication portion ( 7 c ) through which electrolyte can pass. |