Secondary battery and method of manufacturing the same

摘要

A secondary battery according to an embodiment includes a container having a pouring hole through which an electrolyte is poured, and housing the electrolyte, poured through the pouring hole, together with an electrode body; and a sealing lid fixed to the container and closing the pouring hole. The container has a plurality of grooves extending in parallel along the outer edge of the pouring hole, in a predetermined region that surrounds the periphery of the pouring hole, and the sealing lid is provided on the plurality of grooves in such a manner as to close the pouring hole and is fixed to the container.

主权项

1. A method of manufacturing a secondary battery comprising:
forming a plurality of grooves by laser irradiation in a predetermined region surrounding a periphery of a pouring hole of a container in which an electrolyte has been poured, the plurality of grooves being parallel to an outer edge of the pouring hole; placing a sealing lid on the formed plurality of grooves in such a manner as to close the pouring hole; and fixing the placed sealing lid to the container by laser welding, wherein the grooves are formed such that each upper part between the grooves is sharp, the sealing lid is placed on upper parts between the formed grooves, and an under surface of the placed sealing lid is welded to one of the upper parts between the formed grooves.