Patent ID: 8017266

Claim:
An electrochemical device comprising: a case; a power generation element included in said case; and a resin sealing assembly including an external terminal plate, a communication plate electrically connected to said power generation element, a positive temperature coefficient (PTC) element placed between said external terminal plate and said communication plate, an electrode current collector electrically connected to said external terminal plate, and a sealing body made of resin, and sealing an opening of said case; wherein said resin sealing body comprises polypropylene; and wherein relational expressions (1) to (3) are satisfied where the heat conductivity of said resin sealing body is λ (W/m·K) and an amount of heat generation in said PTC element at a time of tripping is Q (W): 0.12≦λ≦0.27; (1) 1.0≦Q≦1.5; and (2) Q≦− 3.33λ+1.9. (3)