Battery management system and driving method thereof
First Claim
1. A battery management system that manages a battery comprising at least one pack comprising a plurality of cells, the system comprising:
- a sensing unit to measure a voltage, a current, and a temperature of each of the cells; and
a micro controller unit (MCU) to receive the voltage, the current, and the temperature of each cell, to calculate an estimated cell voltage, by applying a pack voltage sensing error and a cell voltage deviation to each cell voltage, to calculate an estimated cell resistance, by adding a pack assembly resistance to an internal resistance of the cell, and to calculate a pack output, by using the estimated cell voltage and the estimated cell resistance,wherein the pack assembly resistance is a resistance of elements of the pack other than the cells.
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Abstract
The present invention relates to a battery management system and method. In some embodiments the battery management system includes a sensing unit and a micro controller unit (MCU). The sensing unit measures the current, the voltage and the temperature of a battery. The MCU receives the voltages, the currents, and the temperatures, calculates an estimated cell voltage, by applying a pack voltage sensing error and the cell voltage deviation to the cell voltages, and calculates an estimated cell resistance, by adding a pack assembly resistance to an internal resistance of the cell, and calculates an pack output of the battery by using the estimated cell voltage and the estimated cell resistance.
15 Citations
20 Claims
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1. A battery management system that manages a battery comprising at least one pack comprising a plurality of cells, the system comprising:
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a sensing unit to measure a voltage, a current, and a temperature of each of the cells; and a micro controller unit (MCU) to receive the voltage, the current, and the temperature of each cell, to calculate an estimated cell voltage, by applying a pack voltage sensing error and a cell voltage deviation to each cell voltage, to calculate an estimated cell resistance, by adding a pack assembly resistance to an internal resistance of the cell, and to calculate a pack output, by using the estimated cell voltage and the estimated cell resistance, wherein the pack assembly resistance is a resistance of elements of the pack other than the cells. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A battery management method for managing a battery comprising at least one pack comprising a plurality of cells, the method comprising:
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calculating by using a micro controller unit (MCU) an estimated cell voltage by using a pack voltage sensing error, a cell voltage deviation, and a cell voltage; calculating an estimated cell resistance by adding a pack assembly resistance to an internal resistance of the cell; and calculating a pack output by using the estimated cell voltage, the estimated cell resistance, and one of a fully charged cell voltage and fully discharged cell voltage, wherein the pack assembly resistance is a resistance of elements of the pack other than the cells. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A battery management method, for managing a battery pack comprising a plurality of cells, the method comprising:
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calculating by using a micro controller unit (MCU) an estimated cell voltage of the pack; calculating an estimated cell resistance of the pack; and calculating a pack output of the pack by using an estimated cell voltage of the plurality of cells, an estimated cell resistance of the plurality of cells, and one oft the fully charged cell voltage of the pack and the fully discharged cell voltage of the pack, wherein the calculating of the estimated cell voltage comprises detecting the cell voltage, the pack voltage sensing error, and the cell voltage deviation of the pack, while the pack is discharging. - View Dependent Claims (17, 18, 19, 20)
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Specification