| 摘要 |
PROBLEM TO BE SOLVED: To provide a sealed square battery having both sealing reliability and safety. SOLUTION: In the sealed square battery having a square exterior can (2) having an opening and storing an electrode body and an electrolyte, and a sealing body (1) fitted with the opening, wherein a fitting section between the square exterior can (2) and the sealing body (1) is laser-welded, the sealing body (1) has a safety valve (16) for discharging a gas in the battery when internal pressure of the battery is increased, and an electrode external terminal (11). Laser welding depth in the vicinity of the safety valve (16) is smaller than welding depth of a lateral section and a corner section of the electrode external terminal (11). COPYRIGHT: (C)2011,JPO&INPIT |
