Patent ID: 9225001
Filing Date: 2015-12-29
Classification: H01M,Y02E

Abstract:
1. A prismatic secondary battery, comprising: a prismatic outer casing having an opening; an electrode assembly having a positive electrode plate and a negative electrode plate, the electrode assembly being accommodated within the prismatic outer casing; a sealing body for sealing the opening of the prismatic outer casing, the sealing body having an inner surface that faces toward inside of the prismatic outer casing, an outer surface that is the opposite side of the inner surface, a first through-hole penetrating from the inner surface to the outer surface, and a third through-hole penetrating from the inner surface to the outer surface; a positive electrode collector disposed in a region of the inner surface side of the sealing body and electrically connected to the positive electrode plate; a negative electrode collector disposed in a region of the inner surface side of the sealing body and electrically connected to the negative electrode plate; a positive electrode exterior terminal inserted into the first through-hole and electrically insulated from the sealing body via a first insulating member; a negative electrode exterior terminal inserted into the third through-hole and electrically insulated from the sealing body via a second insulating member; a positive electrode terminal plate arranged on the positive electrode exterior terminal in a region of the outer surface side of the sealing body and electrically connected to the positive electrode collector; and a negative electrode terminal plate arranged on the negative electrode exterior terminal in a region of the outer surface side of the sealing body and electrically connected to the negative electrode collector; wherein the positive electrode terminal plate has a second through-hole into which an upper end part of the positive electrode exterior terminal is inserted; the second through-hole has a first convexity formed on an edge of the upper end side of the second through-hole; the upper end part of the positive electrode exterior terminal inserted into the second through-hole on the side where the first convexity is formed is crimped and connected to the positive electrode terminal plate, and straddling the positive electrode terminal plate, is fused with at least a part of the first convexity by irradiation with high-energy beams, and a first welded spot is formed; and the positive electrode terminal plate is formed with a groove at an outer peripheral of the first convexity.