Patent ID: 9649950
Date: 2017-05-16
CPC Classifications: B60L,H01M,Y02E,Y02T

Claim:
1. A power supply apparatus which includes a generator, a lead battery, and a second battery, the lead battery and the second battery being connected in parallel with the generator, and in which electric power is supplied from the lead battery and the second battery to an electrical load, the apparatus comprising: a protective control section which limits an amount of charge to the second battery to protect the second battery from overcharge, while limiting an amount of discharge from the second battery to protect the second battery from overdischarge, such that a residual capacity of the second battery falls within a predetermined range of use determined in an entire residual capacity range; an opening/closing section which is provided to a connection path electrically connecting between the lead battery and the second battery and is turned on and off to connect and disconnect between the lead battery and the second battery; and an opening/closing control section which controls the opening/closing section, wherein open-circuit voltages and internal resistances of the lead battery and the second battery are determined so that the opening/closing control section makes the opening/closing section an off state in at least one of the power-generation state of the generator and a load-activated state where the electrical load is activated.