Battery having positive temperature coefficient element

摘要

A highly reliable cylindrical primary battery is provided where the surface temperature of a body portion of which at the time of a short circuit is controlled to be low. The heat conductivity lambda (W/m.K) of a resin sealing body of a sealing assembly having a PTC element and the amount of heat generation Q (W) in the PTC element at the time of tripping are set so that the relational expressions of: <?in-line-formulae description="In-line Formulae" end="lead"?>0.12<=lambda<=0.27; (1) <?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>1.0<=Q<=1.5; and (2) <?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>Q<=-3.33lambda+1.9 are met. (3) <?in-line-formulae description="In-line Formulae" end="tail"?>