| 摘要 |
The present invention provides a novel method for electrical connection between a polymer PTC device and a metal lead element to thereby prevent the problems of the connection by caulking or soldering. For this purpose, the present invention provides a process for producing a connection structure by laser welding, said connection structure having (A) a PTC device ( 10 ) including (i) a laminar polymer PTC element ( 12 ) and (ii) a metal foil electrode ( 14 ) disposed on a main surface of the laminar polymer PTC element ( 12 ), and (B) a metal lead element ( 20 ) electrically connected to the metal foil electrode. The metal foil electrode ( 14 ) has at least two metal layers, one of which, the X-th layer, has laser beam absorption a % that is the lowest among the metal layers of the metal foil electrode ( 14 ). The X-th layer is present between a first metal layer ( 18 ) of the metal foil electrode-and the laminar polymer PTC element ( 12 ). First metal layer ( 18 ) is located farthest from the laminar polymer PTC element ( 12 ) and has a laser beam absorption of b %, where b>a.
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