Battery pack
First Claim
Patent Images
1. A battery pack configured to be interfaced with an electrical device, comprising:
- a battery pack housing;
at least three terminals including a positive terminal, a negative terminal, and a sense terminal, the at least three terminals configured to be interfaced with corresponding terminals of the electrical device;
a plurality of rechargeable battery cells arranged within and supported by the housing, each of the battery cells having a respective state of charge, power being transferable between the battery cells and the electrical device;
a balancing circuit configured to detect a charge imbalance among the battery cells based on a plurality of voltages of the plurality of rechargeable battery cells detected at substantially the same time; and
a microprocessor configured to interrupt operation of the battery pack when a balanced ratio between the battery cells falls outside a predetermined range.
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Accused Products
Abstract
An electrical combination including a driver drill capable of producing an average current draw of approximately 20-amps, a circular saw capable of producing an average current draw of approximately 20-amps, and a power tool battery pack operable to supply power to the driver drill and to the circular saw, the battery pack including a plurality of battery cells, the plurality of battery cells each having a lithium-based chemistry.
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Citations
10 Claims
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1. A battery pack configured to be interfaced with an electrical device, comprising:
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a battery pack housing; at least three terminals including a positive terminal, a negative terminal, and a sense terminal, the at least three terminals configured to be interfaced with corresponding terminals of the electrical device; a plurality of rechargeable battery cells arranged within and supported by the housing, each of the battery cells having a respective state of charge, power being transferable between the battery cells and the electrical device; a balancing circuit configured to detect a charge imbalance among the battery cells based on a plurality of voltages of the plurality of rechargeable battery cells detected at substantially the same time; and a microprocessor configured to interrupt operation of the battery pack when a balanced ratio between the battery cells falls outside a predetermined range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification