| abstract |
During overcharging, etc., the carbon dioxide generated by decomposing lithium carbonate in the positive electrode mixture layer easily flows out of the flat wound electrode body, and the pressure-sensitive current is quickly and reliably blocked before the internal pressure of the battery rises significantly. Agency starts. A non-aqueous electrolyte secondary battery (10) according to one embodiment of the present invention has a pressure-sensitive current blocking mechanism, and a positive electrode core exposed portion (15) is formed at one end of a flat wound electrode body (14). , a negative electrode core exposed portion (16) is formed at the other end, lithium carbonate is contained in the positive electrode mixture layer (11a), and on the positive electrode core exposed portion (15), at a position opposite to the separator (13) , a protective layer (11b) is formed along the boundary with the positive electrode mixture layer (11a). |