BATTERY PACK AND BALANCING METHOD OF BATTERY CELLS
First Claim
1. A balancing method for a battery pack comprising a plurality of battery cells, the method comprising balancing the battery cells near an end of discharge.
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Accused Products
Abstract
A balancing method for a battery pack includes balancing battery cells near an end of discharge. A deep discharge of the battery cells can be prevented without using an overdischarge control unit. One battery cell balancing method includes: a balancing check condition determination step for determining whether or not a maximum voltage out of voltages of the battery cells is smaller than a reference voltage; a balancing start condition determination step for determining whether or not a residual capacity difference or voltage difference between the individual battery cells exceeds a reference value; a balancing time calculation step for calculating a balancing time for discharging the battery cell that exceeds the reference value; and a balancing operation step for discharging the selected battery cell when the battery cells are under charge or are at rest or when a discharge current of the battery cells is smaller than a reference current.
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Citations
32 Claims
- 1. A balancing method for a battery pack comprising a plurality of battery cells, the method comprising balancing the battery cells near an end of discharge.
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3. A balancing method for a battery pack comprising a plurality of battery cells, the method comprising:
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determining whether or not a first condition for performing balancing of the discharge cells exists; determining whether or not a second condition for performing balancing of the discharge cells exists; if the first and second conditions exist, calculating a balancing time; and
performing balancing operation in accordance with the balancing time. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A battery cell balancing system for a battery pack comprising a plurality of battery cells, the battery cell balancing system comprising:
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a plurality of balancing switches, each of the balancing switches coupled between positive and negative terminals of a corresponding one of the battery cells; a plurality of balancing resistors, each of the balancing resistors coupled in series with a corresponding one of the balancing switches between the positive and negative terminals of the corresponding one of the battery cells; and a logic circuit for controlling the balancing switches to selectively discharge the battery cells through the respective balancing resistors near an end of discharge, such that the battery cells have same or similar voltages as each other. - View Dependent Claims (26, 27)
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28. A battery pack comprising:
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a plurality of battery cells coupled together; and a battery cell balancing system comprising; a plurality of balancing switches, each of the balancing switches coupled between positive and negative terminals of a corresponding one of the battery cells; a plurality of balancing resistors, each of the balancing resistors coupled in series with a corresponding one of the balancing switches between the positive and negative terminals of the corresponding one of the battery cells; and a logic circuit for controlling the balancing switches to selectively discharge the battery cells through the respective balancing resistors near an end of discharge, such that the battery cells have same or similar voltages as each other. - View Dependent Claims (29, 30, 31, 32)
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Specification