SECONDARY BATTERY

PROBLEM TO BE SOLVED: To provide a secondary battery capable of quickly cooling the battery even if thermal runaway is generated on the inside of a laminate, lowering the temperature of gas ejecting to the outside, and suppressing the amount of ejecting gas. SOLUTION: The secondary battery 10 includes: a container 11 storing an electrolyte on the inside; a laminate 12 including a sheet-like positive electrode plate 18 and a sheet-like negative electrode plate 20, which are alternately laminated, and a separator 21 interposed between the positive electrode plate 18 and the negative electrode plate 20, and housed in the container 11; a radiator plate 13 arranged between the positive electrode plate 18 or the negative electrode plate 20 of the laminate and the container and coming into contact with the container 11 so as to be capable of conducting heat at the edge; and a fire extinguisher-housing structure 22 arranged in the radiator plate 13, housing a fire extinguisher on the inside and being broken at the prescribed temperature. COPYRIGHT: (C)2011,JPO&INPIT