Method and system for battery protection
First Claim
1. An electrical combination comprising:
- a hand held power tool includinga power tool housing,a motor supported by the power tool housing, anda plurality of power tool terminals electrically connected to the motor, the plurality of power tool terminals including a power tool sense terminal;
a battery pack includinga battery pack housing connectable to and supportable by the hand held power tool,a plurality of battery cells supported by the battery pack housing, each of the plurality of battery cells having a lithium-based chemistry, being individually tapped and having an individual state of charge, anda plurality of battery pack terminals to electrically connect to the plurality of power tool terminals, the plurality of battery pack terminals including a battery pack sense terminal, a communication path being provided by the battery pack sense terminal and the power tool sense terminal; and
a controller operable to monitor a state of charge of a number of battery cells less than the plurality of battery cells and to generate a signal based on the monitored state of charge of the number of battery cells less than the plurality of battery cells, the signal being operable to control the operation of the hand held power tool.
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Accused Products
Abstract
An electrical combination. The combination comprises a hand held power tool, a battery pack and a controller. The battery pack includes a battery pack housing connectable to and supportable by the hand held power tool, a plurality of battery cells supported by the battery pack housing, each of the plurality of battery cells having a lithium-based chemistry, being individually tapped and having an individual state of charge. A communication path is provided by a battery pack sense terminal and a power tool sense terminal. The controller is operable to monitor a state of charge of a number of battery cells less than the plurality of battery cells and to generate a signal based on the monitored state of charge of the number of battery cells less than the plurality of battery cells, the signal being operable to control the operation of the hand held power tool.
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Citations
27 Claims
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1. An electrical combination comprising:
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a hand held power tool including a power tool housing, a motor supported by the power tool housing, and a plurality of power tool terminals electrically connected to the motor, the plurality of power tool terminals including a power tool sense terminal; a battery pack including a battery pack housing connectable to and supportable by the hand held power tool, a plurality of battery cells supported by the battery pack housing, each of the plurality of battery cells having a lithium-based chemistry, being individually tapped and having an individual state of charge, and a plurality of battery pack terminals to electrically connect to the plurality of power tool terminals, the plurality of battery pack terminals including a battery pack sense terminal, a communication path being provided by the battery pack sense terminal and the power tool sense terminal; and a controller operable to monitor a state of charge of a number of battery cells less than the plurality of battery cells and to generate a signal based on the monitored state of charge of the number of battery cells less than the plurality of battery cells, the signal being operable to control the operation of the hand held power tool. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification