Back to results
US 10,205,198 B2Granted
Power tool and battery pack
AssigneeKoki Holdings Co., Ltd.
InventorsYoshikazu Kawano, Nobuhiro Takano, Toshiaki Koizumi, Kazuhiko Funabashi, Kenichirou Yoshida, Takao Aradachi
Life of this patent
Estimating the term…
Abstract
A power tool includes a motor and control means for controlling the motor. The motor is capable of being driven by power supplied from a battery pack including a battery cell. The control means is configured to continue to rotate the motor even when a motor-halt signal is inputted from the battery pack. With this structure, the power tool can be used continuously without need to halt rotation of the motor, even when receiving a halt signal, such as an overdischarge detection signal or an overcurrent detection signal.
Claims12
A power tool system comprising:
- a battery pack including at least one secondary battery cell;
- and
- a power tool being capable of continuously performing a desired operation by virtue of discharge current supplied from the secondary battery cell,
- wherein in a state where the power tool is driven and the discharge current shows a behavior to once increase and then decrease, the power tool is configured to halt the desired operation when the discharge current having a current value greater than or equal to a predetermined value continues to flow for a predetermined period of time, and
- wherein when comparing a first case where the power tool is operated in a first state that the battery temperature of the secondary battery cell is at a first temperature and the power tool is driven with a first discharge current having a value greater than or equal to the predetermined value, with a second case where the power tool is operated in a second state that the battery temperature of the secondary battery cell is at a second temperature higher than the first temperature and the power tool is driven with the first discharge current, the predetermined continuous period of time is longer in the first state than in the second state.
2 more elements
A power tool group comprising:
- a battery pack including a battery cell, a battery protection portion configured to output a signal indicating an abnormal state of the battery pack, and a signal output terminal configured to output the signal;
- and
- a plurality of different types of power tools including a first power tool and a second power tool,
- wherein the first power tool comprises:
- a first signal input terminal connectable to the signal output terminal;
- a first motor capable of being driven by power supplied from the battery pack;
- and
- a first controller configured to perform stopping the first power tool in response to the signal received from the battery pack when the battery pack is used for the first power tool, and
- wherein the second power tool comprises:
- a second signal input terminal connectable to the signal output terminal;
- a second motor capable of being driven by power supplied from the battery pack;
- and
- a second controller configured to perform continuing operating the second power tool irrespective of the signal being received from the battery pack when the battery pack is used for the second power tool.
10 more elements
A power tool system comprising:
- a battery pack including a battery cell and a battery protection portion configured to monitor a state of the battery cell;
- and
- a power tool including a motor capable of being driven by power supplied from the battery pack, a current detection part configured to detect current flowing through a current path between the battery cell and the motor, and a controller configured to control the motor,
- wherein the battery protection portion is configured to output an abnormality signal when current flowing through the current path is greater than or equal to a first prescribed value, and
- wherein the controller is configured to continuously rotate the motor even when the abnormality signal is inputted from the battery pack when the current flowing through the current path is greater than or equal to the first prescribed value and smaller than a second prescribed value smaller than the first prescribed value, and further configured to halt the rotation of the motor when the current flowing through the current path is greater than or equal to the second prescribed value.
2 more elements
A power tool system comprising:
- a battery pack including a battery cell and a battery protection portion configured to monitor a state of the battery cell;
- and
- a power tool including a motor capable of being driven by power supplied from the battery pack, a current detection part configured to detect current flowing through a current path between the battery cell and the motor;
- a battery temperature detector configured to detect temperature of the battery cell;
- and a controller configured to control the motor,
- wherein the battery protection portion is configured to output an abnormality signal when current flowing through the current path is greater than or equal to a first prescribed value, and
- wherein the controller, in state that temperature of the battery cell is lower than or equal to a predetermined temperature value, is configured to continue to rotate the motor even when the abnormality signal is inputted from the battery pack and to halt to rotate the motor when voltage of the battery cell is lower than or equal to a predetermined voltage value, and
- wherein the controller, in state that temperature of the battery cell is greater than the predetermined temperature value, is configured to halt to rotate the motor when the abnormality signal is inputted from the battery pack.
5 more elements
Dependencies are inferred from the claim text.