Lithium-based battery pack for a hand held power tool
First Claim
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1. A battery pack comprising:
- a housing connectable to and supportable by a hand held power tool;
a plurality of battery cells supported by the housing, the battery cells having a lithium-based chemistry, each of the plurality of battery cells being cylindrical and having a cell diameter and a cell length, the cell length being at least twice the cell diameter;
first and second terminals for electrically connecting the battery pack to the hand held power tool; and
a circuit configured to monitor at least one parameter of the battery pack and control a discharge of the battery cells to produce a discharge current from the battery cells,wherein an average of the discharge current produced by the battery cells is greater than or equal to approximately 20 amps.
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Abstract
A method for conducting an operation including a power tool battery pack. The battery pack can include a housing, a first cell supported by the housing and having a voltage, and a second cell supported by the housing and having a voltage. The battery pack also can be connectable to a power tool and be operable to supply power to operate the power tool. The method can include discharging one of the first cell and the second cell until the voltage of the one of the first cell and the second cell is substantially equal to the voltage of the other of the first cell and the second cell.
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21 Claims
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1. A battery pack comprising:
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a housing connectable to and supportable by a hand held power tool; a plurality of battery cells supported by the housing, the battery cells having a lithium-based chemistry, each of the plurality of battery cells being cylindrical and having a cell diameter and a cell length, the cell length being at least twice the cell diameter; first and second terminals for electrically connecting the battery pack to the hand held power tool; and a circuit configured to monitor at least one parameter of the battery pack and control a discharge of the battery cells to produce a discharge current from the battery cells, wherein an average of the discharge current produced by the battery cells is greater than or equal to approximately 20 amps. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An electrical combination comprising:
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a hand held power tool; a battery pack for supplying power to the hand held power tool, the battery pack including a housing connectable to and supportable by the hand held power tool, and a plurality of battery cells supported by the housing, the battery cells having a lithium-based chemistry, each of the plurality of battery cells being cylindrical and having a cell diameter and a cell length, the cell length being at least twice the cell diameter; first and second terminals for electrically connecting the battery pack and the hand held power tool; and a circuit configured to monitor at least one parameter of the battery pack, to control a discharge of the battery cells to produce a discharge current from the battery cells, and to supply the discharge current to the hand held power tool, wherein an average of the discharge current produced by the battery cells is greater than or equal to approximately 20 amps. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification