NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND BATTERY THERMAL RELAY

摘要

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery and a battery thermal relay with improved in usability, by promptly sensing a abnormally raised temperature inside a nonaqueous electrolyte secondary battery, safely and surely interrupting or short-circuiting and discharging an abnormal battery, and preventing smoking, firing and explosion from occurring. SOLUTION: This battery is provided with a temperature sensing bar 30 on the opening of a battery can 10 for directly sensing a temperature inside a battery and a thermo-melting metal 32 welded and fixed with a support shaft 31 in the temperature sensing bar 30. A safety device having a terminal switching switch responded and operated by melting of the thermo-melting metal 32 is disposed. By interrupting a carried current to an electrode or by short-circuiting between positive and negative electrodes at an abnormal temperature rise of the battery, an abnormal battery is separated from a plurality of battery packs connected in series.