| abstract |
Provided is a secondary battery capable of breaking an external electrical connection by way of a simpler configuration when an abnormality such as overcharge occurs. A secondary battery 1 comprises a battery element comprising a positive electrode 11 , a negative electrode 12 , a separator 13 , and an electrolytic solution, and a casing sealing the battery element. The electrolytic solution comprises a gel component and an organic solvent having a boiling point of 125° C. or less. The separator 13 comprises a fiber assembly or a microporous structure composed of one or more resins selected from aramid, polyimide, and polyphenylenesulfide, and has an average void size of 0.1 μm or more. |