Patent ID: 8047316

Claim:
An on-vehicle power supply system comprising: a storage battery system, the storage battery system comprising: a battery module A comprising a first nonaqueous electrolyte battery including a negative-electrode material which has an average grain size of 2 μm or more; a battery module B comprising a second nonaqueous electrolyte battery including a negative-electrode material which has an average grain size of primary particles of 1 μm or less and is configured to occlude lithium ions within a range of 0.4V (vs.Li/Li+) or more; a motor or dynamo configured to supply a power to the battery module B; and a controller configured to intermittently connect the battery module A to the battery module B to intermittently supply power from the battery module A to the battery module B by repeating cycles of charging the battery module B from the battery module A and non-charging, while setting a state of charge of the second nonaqueous electrolyte battery within a range of 10 to 90%, when the motor or dynamo is stopped, wherein when power is supplied to the storage battery system from the motor or dynamo, the controller intermittently causes the power from the motor or dynamo to be supplied to the battery module B, and causes the battery module A to supply power to the motor or dynamo, the power from the battery module A being lower than the power supplied to the battery module B.