POWER STORAGE ELEMENT WITH THERMOSENSITIVE RESISTOR LAYER

PROBLEM TO BE SOLVED: To provide a power storage element with no fear of rupture or fire of the power storage element even if high current caused by accidental short circuit of the power storage element flows, high safety, and high energy density. SOLUTION: By using conductive microbeads obtained by covering Ni or Cu on the surface of a hollow balloon formed with the partition of thermoplastic resin having a melting point of 120-170 deg.C as a thermosensitive resistor 3, even if a power storage element is accidentally short-circuited, high current flows, and temperature is raised, the resin partition of the conductive microbeads is melted, and the conductive microbeads are electrically separated each other. Resistance value of a thermosensitive resistor layer mainly comprising the thermosensitive resistors is sharply increased, resistance value between an electrode current collector and an electrode layer is increased, and energy in the electrode layer is instantaneously released.