Thermal fuse, battery pack, and method of manufacturing thermal fuse

A method of manufacturing a thermal fuse, comprising the steps of:

• (a) manufacturing at least one substrate of a strip substrate and a plate substrate;
• (b) disposing a first terminal and a second terminal opposed to each other on said substrate,
• where one end of said first terminal includes a first fusible metal connection, and one end of said second terminal includes a second fusible metal connection,
• said first fusible metal connection and said second fusible metal connection are opposed to each other on said substrate, and
• the other ends of said first terminal and said second terminal protrude in respective directions of said substrate;
• (c) placing an bonding film on said substrate with said first terminal and said second terminal disposed thereon, then heating under pressures said substrate and said bonding film thus laminated, thereby bonding said bonding film to said substrate by first weld deposit produced by heating,
• where said bonding film has a third through-hole, and said first fusible metal connection and said second fusible metal connection are exposed inside said third through-hole;
• (d) disposing a fusible metal between said first fusible metal connection and said second fusible metal connection;
• (e) disposing a cover film to cover said fusible metal and said bonding film, then heating said cover film and said bonding film positioned around said fusible metal except the zone where said fusible metal is disposed, thereby bonding said bonding film to said cover film by second weld deposit produced by heating;
• and
• (f) forming a fuse main body by cutting off weld deposit zones, so as to include a part of the weld deposit zone between said cover film and said bonding film bonded by said second weld deposit,
• where said fuse main body includes a rise portion and the, weld deposit zones, and said fusible metal is located in said rise portion.