SECONDARY BATTERY, ELECTRIC VEHICLE, AND POWER STORAGE SYSTEM

摘要

This secondary battery comprises battery elements and an external casing that houses these battery elements together with a non-aqueous electrolyte. The non-aqueous electrolyte contains a redox shuttle agent. Using the formula T = T０ + IV/hS {1 - exp (-hS/C·t)}, each parameter is set such that the time t1 until the battery temperature T reaches a separator shutdown temperature Ts is 5 < t1 < 30 (min), when the surface area of the battery is S(m2), the battery temperature during overcharge is T (°C), the external temperature is T０ (°C), the maximum current that the redox shuttle agent can follow is I (A), the cell voltage when the redox shuttle agent is reacting is V (V), the air thermal conductivity is h (W/K·m2), the battery thermal capacity is C (J/K), and the overcharge time is t (min).