POWER STORAGE DEVICE

摘要

In an electricity storage device, a case 1 in which an electrode group is accommodated includes a first main wall 11 and a second main wall 12 that face each other, a first side wall 13 and a second side wall 14 through which the first main wall 11 and the second main wall 12 are coupled with each other at both sides of the first main wall 11 and the second main wall 12, a top wall 15 on which an external terminal is disposed, and a bottom wall 16. The electrode group is accommodated in the case 1 while both end surfaces of the electrode group in a stacking direction of positive electrode plates and negative electrode plates face an inner surface of the first main wall 11 and an inner surface of the second main wall 12. A plurality of positive electrode tabs disposed on the plurality of positive electrode plates at a position close to the first side wall 13 and a plurality of negative electrode tabs disposed on the plurality of negative electrode plates at a position close to the second side wall 14 protrude from an end surface of the electrode group in a direction toward the top wall 15. The top wall 15 of the case 1 has a recess 17 depressed to a position between the positive electrode tabs and the negative electrode tabs.