BATTERY PACK, METHOD FOR PRODUCING SAME, ELECTRIC VEHICLE PROVIDED WITH SAID BATTERY PACK, AND POWER STORAGE DEVICE

摘要

The present invention improves service life properties by effectively preventing a decline in electric properties due to repeated charging and discharging over time while preventing damages to the outer case of a flat secondary battery. A battery pack is provided with a battery stacked body (9) in which multiple flat secondary batteries (1) are stacked, end plates (4) disposed on both ends of the battery stacked body (9), and bind bars (5) which are connected to the end plates (4) and which secure the flat secondary batteries (1) of the battery stacked body (9) while applying a predetermined clamping pressure in the stacking direction. The flat secondary batteries (1) constituting the battery stacked body (9) are each provided with an electrode body (11) in which a positive electrode (11A) and a negative electrode (11B) are spirally wound via a separator (11C), and an outer case (12) which has a hermetically-sealed structure in which an electrode body (11) and an electrolyte solution are stored. In the battery pack, the electrode bodies (11) of the flat secondary batteries (1) are press-molded into a flat shape by means of a pressing pressure that is higher than the clamping pressure applied to the flat secondary batteries (1) by the bind bars (5).