| 摘要 |
<p>PROBLEM TO BE SOLVED: To secure airtightness (sealability) of a case by closing pin holes with a case body, a lid body and a separate member even if the pin holes are generated when the case body and the lid body are beam-welded.SOLUTION: In a method for welding a lid body 14 and a case body 13 of a secondary battery 10 (power storage battery), the lid body 14 closing an opening 13a is beam-welded to the case body 13 in a state where an electrode assembly 12 is housed in the case body 13 having the opening 13a capable of inserting the electrode assembly 12 thereinto. Then, beam irradiation is performed on an abutting part between the lid body 14 and the case body 13 from the outside thereof in a state where a place to be welded of the lid body 14 is arranged at a welding position abutting with the case body 13 and under such a condition, a thermoplastic material 24 capable of being molten by heat resulting from welding is arranged on the inner side than the abutting part between the lid body 14 and the case body 13.</p> |
