CYLINDRICAL LITHIUM-ION BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a cylindrical lithium-ion battery which moderately acts and which is superior in safety even if exposed to conditions such as overcharge or vibration or the like. SOLUTION: A wound group 6 is formed by winding a positive electrode plate and negative electrode plate around a shaft core 21 via a separator, and a sheet 25 having a cubical expansion layer 24 which has synthetic resin as the main component between the winding group 6 and battery container 5 is made to exist. Then, the cubical expansion layer 24 is formed in stripe-shaped toward a direction in parallel with the shaft core 21 in the sheet 25.