Storage battery system, on-vehicle power supply system, vehicle and method for charging storage battery system

摘要

A storage battery system includes a battery module A (6) with a first nonaqueous electrolyte battery including a negative-electrode material which has an average grain size of 2 µm or more and is used to occlude and discharge lithium ions, a battery module B (7) with a second nonaqueous electrolyte battery set at a lithium-ion-occluding potential of 0.4V (vs.Li/Li) or more, and including a negative-electrode material which has an average grain size of primary particles of 1 µm or less and is used to occlude lithium ions, and a controller (4) configured to intermittently connect the battery module A (6) to the battery module B (7) to intermittently supply power from the battery module A (6) to the battery module B (7) to set a charge state and a discharge depth of the second nonaqueous electrolyte battery within a range of 10 to 90%, when no power is supplied to the battery module B at least from an outside.