Patent ID: 9564613
Date: 2017-02-07
CPC Classifications: H01G,H01M,Y02E,Y10T

Claim:
1. A method for producing an electric storage device, the device comprising: an electrode assembly comprising a positive electrode plate and a negative electrode plate that are insulated from each other; and a case that houses the electrode assembly and comprises a case body having an opening, and a cover plate configured to cover the opening of the case body, the method comprising: wherein the case body comprises a step portion at the opening edge, wherein the cover plate comprises a projection that is inserted into the opening of the case body, wherein at least a portion of the projection opposes the step portion within the case body, wherein the seam is irradiated with the laser at a position corresponding to the step portion in the laser irradiation step, and wherein the step portion extends from an outer surface of the case body toward an inner surface of the case body such that the step portion is non-perpendicular to the inner surface of the case body to provide a gap between the cover plate and the opening edge of the opening of the case body.