MULTI-BATTERY SYSTEM FOR INCREASING THE ELECTRIC RANGE
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Abstract
A motor vehicle includes an high-voltage power system, a multi-battery system including energy stores for supplying power to an electric drive motor, and switching units connecting the energy stores to the power system. A control device detects a state of charge of each energy store and to selectively connect and/or disconnect the energy stores as a function of their state of charge during travel to and from the power system. The switching units include each contactors to disconnect the energy stores on a plus side and on a minus side from the power system, with only either the positive side or negative side of each energy store including a contactor configured to switch when a load is greater than a minimum load, whereas the other one of the positive and negative sides includes a contactor that is adequate only for a load demand which is less than the minimum load.
106 Citations
15 Claims
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1-7. -7. (canceled)
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8. A motor vehicle, comprising:
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an electric drive motor; an on-board high-voltage power system; a multi-battery system comprising a plurality of energy stores for supplying power to the electric drive motor; a plurality of switching units connecting the energy stores to the on-board high-voltage power system in one-to-one correspondence; and a control device adapted to detect a state of charge of each energy store and to selectively connect and/or disconnect the energy stores as a function of their state of charge during travel to and from the on-board high-voltage power system, wherein the switching units include each contactors to disconnect the corresponding energy stores on a plus side and on a minus side from the on-board high-voltage power system, with only one of the positive and negative sides of each of the plurality of energy stores including a one of the contactors which is configured to switch when a load is greater than a minimum load, whereas the other one of the positive and negative sides includes a one of the contactors that is adequate only for a load demand which is less than the minimum load. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of operating a motor vehicle, comprising:
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detecting by a control device a state of charge of an energy store; selectively connecting, depending on the state of charge, also under load, when a driving current flows, one of a plurality of said energy store to an on-board high-voltage power system, and disconnecting another one of the plurality of said energy store from the on-board high-voltage power system, with the energy store being disconnected on a plus side and on a minus side from the on-board high-voltage power system by contactors, arid with only one of the positive and negative sides of each of the plurality of said energy store including a one of the contactors which is configured to switch, when a load is greater than a minimum load, whereas the other one of the positive and negative sides includes a one of the contactors that is adequate only for a load demand which is less than the minimum load.
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Specification