Rectangular secondary battery

摘要

An insulation sheet is disposed between a rectangular housing and an electrode body. A first side wall of the insulation sheet is disposed between a large-area side surface of the rectangular housing and the electrode body. The first side wall includes a first folded portion that is folded along an edge of the first side wall near a sealing plate. The first folded portion extends from an edge of the first side wall near the sealing plate toward a bottom surface of the rectangular housing and is disposed between the large-area side surface and the electrode body in such a way that the first folded portion overlaps the first side wall.

主权项

1. A rectangular secondary battery comprising:
a rectangular housing that has an opening, a bottom surface, a pair of large-area side surfaces, and a pair of small-area side surfaces; a liquid electrolyte that is disposed in the rectangular housing; a sealing plate that seals the opening and that has an injection hole through which the liquid electrolyte is injected into the rectangular housing; an electrode body that has a planar shape, that is disposed in the rectangular housing, and that includes a positive electrode plate and a negative electrode plate; and an insulation sheet that is disposed between the rectangular housing and the electrode body, the insulation sheet including
a bottom portion disposed between the bottom surface of the rectangular housing and the electrode body,a first side wall disposed between one of the pair of large-area side surfaces and the electrode body, anda second side wall disposed between the other of the pair of large-area side surfaces and the electrode body, wherein the first side wall includes a first folded portion that is folded along an edge of the first side wall near the sealing plate, and wherein the first folded portion extends from the edge of the first side wall near the sealing plate toward the bottom surface of the rectangular housing and is disposed between one of the pair of large-area side surfaces and the electrode body in such a way that the first folded portion overlaps with the first side wall.