CONTROL METHOD FOR LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY SYSTEM

摘要

A control method for a lithium ion secondary battery includes performing a charging step (S5 to S7) of charging the lithium ion secondary battery (100) with a predetermined quantity of electricity when the battery voltage of the lithium ion secondary battery (100) has decreased to a lower limit battery voltage that is set at a value that falls within a range higher than (B - C) V and lower than or equal to (B - C + 0.2) V where a maximum value of a positive electrode potential of a flat portion (F1) in a discharge positive electrode potential curve (K1) is B (V) and a negative electrode dissolution potential is C (V). It is possible to suppress a dissolution of a negative electrode current collector (158) of the lithium ion secondary battery (100) to prevent the service life of the lithium ion secondary battery (100) from shortening because of an internal short circuit.