Method and system for battery protection employing over-discharge control
First Claim
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1. A battery pack configured to be interfaced with a hand held power tool, the battery pack comprising:
- a housing;
a locking assembly operable to lock the battery pack to the power tool, the locking assembly including an actuator;
at least three terminals including a positive terminal, a negative terminal, and a sense terminal;
a plurality of cells, each cell having a voltage, power being transferable between the cells and the power tool, each cell having a lithium-based battery chemistry, the cells being electrically connected to one another in a partial parallel arrangement and a partial series arrangement;
a battery identification resistor; and
a thermistor indicative of a battery pack temperature;
whereina controller is operable to control a function of the battery pack, the controller being external to the cells and being operable with a voltage at least one of equal to and greater than an operating voltage threshold, the cells being operable to selectively supply voltage to the power tool as a function of the state of a switch and the thermistor; and
the controller is operable to prevent the battery pack from entering an over-discharged state via the switch when the voltage supplied by the cells to the power tool is below a predetermined battery voltage threshold.
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Abstract
A method and system for battery protection. In some aspects, a battery pack configured to be interfaced with a power tool includes a housing, a cell, a controller, and a circuit. The circuit is operable to enable the controller to operate when the voltage supplied by the cell to the controller is below an operating voltage threshold of the controller.
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Citations
5 Claims
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1. A battery pack configured to be interfaced with a hand held power tool, the battery pack comprising:
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a housing; a locking assembly operable to lock the battery pack to the power tool, the locking assembly including an actuator; at least three terminals including a positive terminal, a negative terminal, and a sense terminal; a plurality of cells, each cell having a voltage, power being transferable between the cells and the power tool, each cell having a lithium-based battery chemistry, the cells being electrically connected to one another in a partial parallel arrangement and a partial series arrangement;
a battery identification resistor; and
a thermistor indicative of a battery pack temperature;
whereina controller is operable to control a function of the battery pack, the controller being external to the cells and being operable with a voltage at least one of equal to and greater than an operating voltage threshold, the cells being operable to selectively supply voltage to the power tool as a function of the state of a switch and the thermistor; and the controller is operable to prevent the battery pack from entering an over-discharged state via the switch when the voltage supplied by the cells to the power tool is below a predetermined battery voltage threshold. - View Dependent Claims (2, 3, 4, 5)
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Specification