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POWER SOURCE APPARATUS FOR VEHICLE

  • US 20110001352A1
  • Filed: 07/01/2010
  • Published: 01/06/2011
  • Est. Priority Date: 07/01/2009
  • Status: Abandoned Application
First Claim
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1. A power source apparatus which is mounted to a vehicle with an alternator and a constant voltage control means capable of adjusting a voltage of electric power generated by the alternator to a set voltage, the power source apparatus comprising:

  • a lead-acid battery electrically connected to an alternator; and

    a secondary battery, electrically connected in parallel to the lead-acid battery, having an output power density and an energy density which is higher than an output power density and an energy density of the lead-acid battery,wherein an open circuit voltage and an internal resistance of the lead-acid battery and an open circuit voltage and an internal resistance of the secondary battery are determined in order to satisfy the following conditions (a), (b), and (c);

    (a) an equal voltage point, at which the open circuit voltage of the lead-acid battery becomes equal to the open circuit voltage of the secondary battery, is present in a use range of state of charge (SOC) of the lead-acid battery and a use range of SOC of the secondary battery;

    (b) the open circuit voltage of the secondary battery is higher than the open circuit voltage of the lead-acid battery at an upper limit side from the equal voltage point in the use range of SOC of the secondary battery; and

    (c) a terminal voltage of the secondary battery when a maximum charging current flows in the secondary battery is not more than the set voltage which is set by the constant voltage control means.

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