POWER SOURCE APPARATUS FOR VEHICLE
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A power source apparatus mounted to a vehicle is equipped with a lead-acid battery and a lithium battery. An open circuit voltage and an internal resistance of each of the batteries are determined to satisfy the following conditions (a1), (a2), and (a3): (a1) In the use range of SOC of the lead-acid battery and the use range of SOC of the lithium battery, there is an equal voltage point Vds at which the open circuit voltage V0 (Pb) of the lead-acid battery becomes equal to the open circuit voltage V0 (Li) of the lithium battery; (a2) The relationship of V0 (Li)>V0 (Pb) is satisfied in the upper limit side of the use range of SOC of the battery; and (a3) A terminal voltage Vc (Li) of the lithium battery is not more than a set voltage Vreg of a regulator when a maximum current flows in the lithium battery.
-
Citations
26 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. 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; a secondary battery, electrically connected in parallel to the lead-acid battery, is higher in output density or energy density than the lead-acid battery; and rectifying means placed between the lead-acid battery and the secondary battery so that a forward current direction of the rectifying means becomes a direction from the lead-acid battery to the secondary battery, and the rectifying means having a barrier voltage to the current flowing in the forward direction through the rectifying means, 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 secondary battery is equal to a subtracted voltage obtained by subtracting the barrier voltage of the rectifying means from the open circuit voltage of the lead-acid 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 subtracted 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. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
-
Specification