Patent ID: 7547489

Claim:
An electrochemical device having an electrode plate assembly that comprises: (a) at least one first electrode; (b) at least one second electrode; and (c) a separator interposed between the first electrode and the second electrode, wherein said electrode plate assembly includes a PTC device, said first electrode (a) comprises a first current collector sheet having a conductive area and an insulating area and at least one first electrode mixture layer carried thereon, said second electrode (b) comprises a second current collector sheet having a conductive area and an insulating area and at least one second electrode mixture layer carried thereon, said electrode plate assembly is a layered-type electrode plate assembly obtained by layering said first electrode, said second electrode and said separator, and the conductive area of said first current collector sheet is connected to a first terminal on a first side face of said layered-type electrode plate assembly, the conductive area of said second current collector sheet is connected to a second terminal on a second side face of said layered-type electrode plate assembly, the insulating area of said first current collector sheet is positioned on said second side face, and the insulating area of said second current collector sheet is positioned on said first side face, wherein said insulating area of said first current collector protrudes into the second terminal, and said insulating area of said second current collector protrudes into the first terminal.