Patent ID: 8399804

Claim:
A method for manufacturing a prismatic battery, the method comprising: laser welding by using a laser welding jig provided with a securing section for securing a prismatic battery outer can having side surfaces and a mouth portion at an upper portion thereof and a gas supply section for supplying an inert gas, and by supplying the inert gas from the laser welding jig to a welding point between the prismatic battery outer can and a sealing cover that is fitted to the mouth portion of the prismatic battery outer can, the laser welding jig having the securing section provided with a slit-shaped blower outlet at a position below the welding point, the inert gas being supplied from the gas supply section to the slit-shaped blower outlet, and the inert gas being blown from the slit-shaped blower outlet upward to the welding point from below along the side surfaces of the prismatic battery outer can to carry out the laser welding.