Patent ID: 8551635
Filing Date: 2013-10-08
Classification: H01M,Y02E

Abstract:
1. A power supply device comprising: a plurality of rectangular battery cells; and a holding portion that holds said plurality of rectangular battery cells with the rectangular battery cells being arranged side by side, wherein, each of the rectangular battery cells includes wherein the electrically insulating film is formed from a sheet of electrically insulating film that has main, bottom and side surface covering portions, wherein the main, bottom and side surface covering portions are continuously arranged, and cover the main, bottom and side surfaces of the exterior container, respectively, wherein said electrically insulating film is shaped so that the bottom surface covering portion is arranged between the pair of main surface covering portions, and the side surface covering portions protrude from the both sides of the main surface covering portions and the bottom surface covering portion, which are continuously arranged, wherein each of the side surface covering portions has first side surface covering portions that protrude from the side edges of the main surface covering portions, and a second side surface covering portion that protrudes outward of the bottom surface covering portion, wherein the first and second side surface covering portions are not separated from the both side edges of the main and bottom surface covering portion so that the first and second side surface covering portions are continuously arranged in connection areas between the first and second side surface covering portions, wherein the bottom and main surface covering portions are folded inward at the boundary lines between the bottom and main surface covering portions so that the bottom and main surface covering portions cover the bottom and main surfaces of the exterior container, respectively, wherein the second and bottom surface covering portions are folded inward at the boundary lines between the second and bottom surface covering portions, wherein the first and main surface covering portions are folded inward at the boundary lines between the first and main surface covering portions, wherein the first and second side surface covering portions are folded in parts in proximity to the connection area between the first and second side surface covering portions so that the first and second side surface covering portions are superposed on one another on the side surfaces of the exterior container, wherein the superposed parts are welded and made watertight, wherein the first and second side surface covering portions cover the side surfaces of the exterior container, and wherein the plurality of rectangular battery cells are arranged side by side and held by the holding portion so that the bottom surfaces of the plurality of rectangular battery cells are aligned coplanar with each other.