Electric storage device, electric storage apparatus, method for producing electric storage device, and method for producing cover plate

摘要

The electric storage device according to the present invention includes a case having a case body and a cover plate, the case body includes a step portion at an opening edge, the cover plate includes a projection that is inserted into the opening of the case body, and a portion of the projection opposes the step portion within the case body.

主权项

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:
irradiating a seam between the cover plate and an opening edge of the case body with a laser, with the cover plate being placed on the opening edge of the opening of the case body, 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.