Vehicular power supply system
First Claim
1. A vehicular power supply system, comprising:
- a lead battery;
a lithium-ion battery that is charged and discharged at a voltage higher than the lead battery'"'"'s voltage;
a step-down DC-DC converter that is connected between the lead battery and the lithium-ion battery and whose output voltage is controllable;
a generator connected with the step-down DC-DC converter and the lithium-ion battery;
a lithium-ion battery SOC detection means for detecting a state of charge of the lithium-ion battery;
a relay for the lithium-ion battery by which the lithium-ion battery is connected to and disconnected from the generator and the step-down DC-DC converter; and
a control means, based on the state of charge of the lithium-ion battery, for taking control of switching on and off the relay for the lithium-ion battery; and
a lithium-ion battery temperature detection means for detecting a temperature of the lithium-ion battery,wherein the control means switches off the relay for the lithium-ion battery when the temperature of the lithium-ion battery is lower than or higher than a predetermined temperature range, and operates the generator with the step-down DC-DC converter continuously activated.
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Accused Products
Abstract
A vehicular power supply system is provided, which is equipped with a two-battery power supply system including a lithium-ion battery and a lead battery, and can securely supply the lead battery with power without fail even when the lithium-ion battery is disconnected by a relay. The vehicular power supply system comprises: a lead battery; a lithium-ion battery that can be charged and discharges at a voltage higher than the lead battery'"'"'s voltage; a step-down DC-DC converter that is connected between the lead battery and the lithium-ion battery and whose output voltage is controllable; a generator connected with the step-down DC-DC converter and the lithium-ion battery; a lithium-ion battery SOC detection means for detecting a state of charge of the lithium-ion battery; a relay for the lithium-ion battery by which the battery is connected to or disconnected from the generator and the step-down DC-DC converter; and a control means, based on the state of charge of the lithium-ion battery, for taking control of switching on and off the relay for the lithium-ion battery.
12 Citations
5 Claims
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1. A vehicular power supply system, comprising:
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a lead battery; a lithium-ion battery that is charged and discharged at a voltage higher than the lead battery'"'"'s voltage; a step-down DC-DC converter that is connected between the lead battery and the lithium-ion battery and whose output voltage is controllable; a generator connected with the step-down DC-DC converter and the lithium-ion battery; a lithium-ion battery SOC detection means for detecting a state of charge of the lithium-ion battery; a relay for the lithium-ion battery by which the lithium-ion battery is connected to and disconnected from the generator and the step-down DC-DC converter; and a control means, based on the state of charge of the lithium-ion battery, for taking control of switching on and off the relay for the lithium-ion battery; and a lithium-ion battery temperature detection means for detecting a temperature of the lithium-ion battery, wherein the control means switches off the relay for the lithium-ion battery when the temperature of the lithium-ion battery is lower than or higher than a predetermined temperature range, and operates the generator with the step-down DC-DC converter continuously activated. - View Dependent Claims (2, 3, 4, 5)
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Specification