BATTERY PACK, METHOD OF CONTROLLING THE SAME, AND ENERGY STORAGE SYSTEM INCLUDING THE BATTERY PACK
First Claim
1. A method of controlling a battery pack comprising a plurality of battery cells, the method comprising:
- calculating charge capacities of the battery cells;
obtaining a first average value, wherein the first average value is an average value of the calculated charge capacities;
establishing a first standard value for selecting an abnormal battery cell based on the first average value;
determining a first battery cell having the lowest charge capacity from among battery cells having charge capacities greater than the first standard value;
establishing a second standard value for selecting at least one battery cell that is to be discharged during a cell balancing operation; and
performing a cell balancing operation with respect to the at least one battery cell having charge capacities greater than the second standard value.
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Accused Products
Abstract
A battery pack, a method of controlling the same, and an energy storage system including the battery pack are disclosed. According to some aspects, the method may include calculating charge capacities of the battery cells, obtaining a first average value, which is an average value of the calculated charge capacities, establishing a first standard value for selecting an abnormal battery cell based on the first average value and determining a first battery cell having the lowest charge capacity from among battery cells having charge capacities greater than the first standard value. A second standard value for selecting a battery cell that is to be discharged during a cell balancing operation may be established. A cell balancing operation with respect to battery cells having charge capacities greater than the second standard value may then be performed. Accordingly, a cell balancing operation may be effectively performed in order to efficiently manage a battery pack.
44 Citations
20 Claims
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1. A method of controlling a battery pack comprising a plurality of battery cells, the method comprising:
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calculating charge capacities of the battery cells; obtaining a first average value, wherein the first average value is an average value of the calculated charge capacities; establishing a first standard value for selecting an abnormal battery cell based on the first average value; determining a first battery cell having the lowest charge capacity from among battery cells having charge capacities greater than the first standard value; establishing a second standard value for selecting at least one battery cell that is to be discharged during a cell balancing operation; and performing a cell balancing operation with respect to the at least one battery cell having charge capacities greater than the second standard value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A battery pack comprising:
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a plurality of battery cells; a capacity measuring unit configured to measure charge capacities of the battery cells; an average value calculator configured to calculate an average value of the measured charge capacities; a balancing controller configured to select at least one battery cell that is to be discharged during a cell balancing operation based on the measured charge capacities and the average value; and a balancing circuit unit configured to perform the cell balancing operation according to a control signal applied from the balancing controller. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. An energy storage system that is connected to a battery comprising a plurality of battery cells, a power generation system, and a grid so as to supply power to a load, the energy storage system comprising:
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a capacity measuring unit configured to measure charge capacities of the battery cells; an average value calculator configured to calculate an average value of the measured charge capacities; and a balancing controller configured to select at least one battery cell that is to be discharged during a cell balancing operation based on the measured charge capacities and the average value, and wherein the balancing controller is further configured to perform a cell balancing operation with respect to the selected battery cell.
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Specification