Battery system and method for determining battery module voltages
First Claim
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1. A battery system comprising:
- at least two battery modules connected in series to provide a battery voltage, each of the at least two battery modules comprising;
a plurality of battery cells connected in series to provide a battery module voltage;
a cell voltage sensing unit configured to measure a battery cell voltage of each battery cell of the plurality of battery cells; and
a module voltage sensing unit configured to measure the battery module voltage independently of the cell voltage sensing unit; and
a central controller, the central controller being operatively connected to the cell voltage sensing unit of each of the at least two battery modules via a common communication bus, the central controller being operatively connected to the module voltage sensing unit of each of the at least two battery modules via separate connections.
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Abstract
A battery system comprises at least two modules which include a plurality of battery cells, with each module being associated with a cell voltage detection unit which is connected to a central controller via a common communication bus. Each module additionally includes a module voltage detection unit which is connected to the central controller and is configured to separately detect the voltage of the associated module.
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Citations
10 Claims
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1. A battery system comprising:
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at least two battery modules connected in series to provide a battery voltage, each of the at least two battery modules comprising; a plurality of battery cells connected in series to provide a battery module voltage; a cell voltage sensing unit configured to measure a battery cell voltage of each battery cell of the plurality of battery cells; and a module voltage sensing unit configured to measure the battery module voltage independently of the cell voltage sensing unit; and a central controller, the central controller being operatively connected to the cell voltage sensing unit of each of the at least two battery modules via a common communication bus, the central controller being operatively connected to the module voltage sensing unit of each of the at least two battery modules via separate connections. - View Dependent Claims (2, 3, 4)
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5. A method for determining battery module voltages in a battery system including at least two battery modules connected in series to provide a battery voltage, each of the at least two battery modules including (i) a plurality of battery cells connected in series to provide a battery module voltage, (ii) a cell voltage sensing unit configured to measure a battery cell voltage of each battery cell of the plurality of battery cells, and (iii) a module voltage sensing unit configured to measure the battery module voltage independently of the cell voltage sensing unit, the method comprising:
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measuring the battery cell voltages the battery cells of each plurality of battery cells with the respective cell voltage sensing units; transmitting the measured battery cell voltages via a common communication bus to a central controller, the central controller being operatively connected to the cell voltage sensing unit of each of the at least two battery modules via the common communication bus; measuring the battery module voltages of each battery module with the respective module voltage sensing units; and transmitting the measured battery module voltages to the central controller, the central controller being operatively connected to the module voltage sensing unit of each of the at least two battery modules via separate connections. - View Dependent Claims (6, 7, 8, 9)
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10. A motor vehicle comprising:
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a drive system; and a battery system connected to the drive system, the battery system comprising; at least two battery modules connected in series to provide a battery voltage, each of the at least two battery modules comprising; a plurality of battery cells connected in series to provide a battery module voltage; a cell voltage sensing unit configured to measure a battery cell voltage of each battery cell of the plurality of battery cells; and a module voltage sensing unit configured to measure the battery module voltage independently of the cell voltage sensing unit; and a central controller, the central controller being operatively connected to the cell voltage sensing unit of each of the at least two battery modules via a common communication bus, the central controller being operatively connected to the module voltage sensing unit of each of the at least two battery modules via separate connections.
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Specification