Patent ID: 8991232
Filing Date: 2015-03-31
Classification: B21K,H01M,Y02E

Abstract:
1. A method for producing a sealing plate for a prismatic secondary battery, the sealing plate including a front face and a back face and including a pair of mouths for attaching a negative electrode terminal and a positive electrode terminal, the pair of mouths comprising a first mouth formed near one end in a longitudinal direction of the sealing plate, and a second mouth being formed near an other end in a longitudinal direction of the sealing plate, and including a gas release valve and an electrolyte pour hole provided between the pair of mouths, the method comprising: (1) simultaneously forming through forging, with respect to a material forming the sealing plate for a prismatic secondary battery, a coining area formed on the front face and used for positioning of an insulating member around each of the pair of mouths, and a first groove formed on the front face, the first groove from a position between the corresponding coining area and a first long side edge of the sealing plate to near a position to form the gas release valve along the first long side edge of the sealing plate; and thereafter (2) forming the gas release valve at the position to form the gas release valve through forging.