Control system for battery hybrid system
First Claim
1. A control system for a hybrid battery power source having at least one energy battery of high energy density capable of discharging a small current over a comparatively long period of time and at least one power battery of high power density capable of discharging at least momentarily a comparatively large current for supplying current to a variable load, said control system comprising:
- controllable switch means for selectively connecting only one and both of the energy and power batteries in parallel across the load;
means for monitoring the discharge current from at least one of the energy and power batteries, and the load current through the load;
said monitoring means providing respective output signals in dependence on said load and discharge currents;
means for controlling said switch means in dependence on said output signals to cause said switch means to connect both said energy and power batteries in parallel across the load when said load current is smaller than a fixed level and the dicharge current from the energy battery is below a fixed level, and to connect only the power battery across the load when said load current is higher than a fixed level and the discharge current from the energy battery is at or above said predetermined level.
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Abstract
An electric auto power supply has an energy battery which is capable of discharging a current for a comparatively long period of time and high in energy density, and a power battery which is capable of discharging a current of a comparatively high amperage and high in power density. The energy battery and the power battery are connected respectively by way of switching means in parallel relation to each other, so as to be used as a power source of an electromobile. The current discharged from these batteries is controlled, such that a current required for the travelling of the electromobile, which is dependent upon the travelling conditions thereof, is supplied simultaneously from both batteries, or separately from individual batteries, or otherwise only from one battery, while a current is being charged to the other battery, thus extending the possible mileage range of the electromobile.
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Citations
11 Claims
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1. A control system for a hybrid battery power source having at least one energy battery of high energy density capable of discharging a small current over a comparatively long period of time and at least one power battery of high power density capable of discharging at least momentarily a comparatively large current for supplying current to a variable load, said control system comprising:
- controllable switch means for selectively connecting only one and both of the energy and power batteries in parallel across the load;
means for monitoring the discharge current from at least one of the energy and power batteries, and the load current through the load;
said monitoring means providing respective output signals in dependence on said load and discharge currents;
means for controlling said switch means in dependence on said output signals to cause said switch means to connect both said energy and power batteries in parallel across the load when said load current is smaller than a fixed level and the dicharge current from the energy battery is below a fixed level, and to connect only the power battery across the load when said load current is higher than a fixed level and the discharge current from the energy battery is at or above said predetermined level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- controllable switch means for selectively connecting only one and both of the energy and power batteries in parallel across the load;
Specification