Patent ID: 9537172
Date: 2017-01-03
CPC Classifications: H01M,Y02E,Y02P,Y10T

Claim:
1. A manufacturing method of a sealed secondary battery, comprising: placing a first sealing body, which is configured to seal an opening portion of a lid body to cover the opening portion and is formed into a sheet-like shape by using a metal material, on the lid body of a container of a sealed secondary battery in which an opening of a container main body having an electrode body and an electrolyte arranged therein is closed by the lid body which is formed of a metal material and comprises the opening portion; welding the first sealing body to the lid body; charging the sealed secondary battery having the first sealing body welded thereto; discharging the sealed secondary battery after the charging; boring a hole in the first sealing body to form a hole portion after the discharging; placing a second sealing body, which is configured to seal the opening portion and the hole portion and formed into a sheet-like shape by using a metal material, to cover the first sealing body; and welding the second sealing body to the lid body through the first sealing body, wherein the opening portion comprises a first opening portion formed on a container main body side of the lid body and a second opening portion formed with a larger diameter than the first opening portion, and the hole portion is bored through the first sealing body between an inner peripheral surface of the first opening portion and an inner peripheral surface of the second opening portion.