Abstract: A discharge system includes: a secondary battery pack; a discharge device; and an application software running on a personal computer connected to the discharge device. The application software receives total battery voltage information, temperature information, and over-discharge information of the secondary battery pack through the discharge device, determines deterioration of the secondary battery pack based on the informations, and displays results of the determination. Further, the application software instructs the discharge device to terminate the discharge when the temperature in the pack exceeds a predetermined value and/or an over-discharge is detected.

Abstract: A charge circuit is composed of a first circuit and a second circuit. Said second circuit is provided at a battery pack in which a secondary battery is comprised. Said first circuit is provided at a charger for charging said secondary battery. Said charge circuit comprises: an output power supply section; a control section configured to control said output power supply section to perform a charging operation; a memory provided at said second circuit and storing a number of charging; and a threshold current setting section. Said control section is configured to, in said charging operation, perform firstly a constant current charging operation, and then perform a constant voltage charging operation, and finish the charging operation when a charging current reaches a charge stop current value. Said threshold current setting section is configured to decrease said charge stop current value along with the increase of said number of charging.

Abstract: An electric power tool is included in a plurality of types of electric power tools. The plurality of types of electric power tools comprise a plurality of types of battery packs having different rated output voltages and a plurality of types of tool bodies, the housings of which are equipped with an attached part on which each of the battery packs is mounted in a freely removable manner. The attached part possessed by the plurality of types of tool bodies equipped with motors having different voltage characteristics is formed so as to be able to mount an arbitrary one of the plurality of types of battery packs having different rated output voltages. This makes it possible to widen the range of available battery packs and enhance convenience.

Abstract: A battery pack includes a rechargeable battery, a battery information memory unit configured to store battery type information relating to a type of the rechargeable battery, and an information output unit configured to output the battery type information from the battery pack.

Abstract: An electric power tool includes a rechargeable battery, a motor, a detector that detects a parameter that affects a voltage drop of the rechargeable battery and outputs a detection signal corresponding to the detected parameter, a controller that receives the detection signal and generates a control signal in accordance with the detection signal, and a power switching unit operated in accordance with the control signal from the controller to switch between a situation in which the rechargeable battery supplies electric power to the motor and a situation in which the rechargeable battery stops supplying electric power to the motor. The controller controls the power switching unit using a pulse width modulation (PWM) control signal when the electric power tool is activated. The controller changes a duty ratio of the PWM control signal in accordance with the detection signal of the detector.

Abstract: The electric tool is powered by a secondary battery as a power source, and includes: an output section configured to be transmitted thereto a rotation of a motor directly or through a decelerator; a voltage measurement section that measures a battery voltage; a storage means that stores, as a reference voltage, a voltage value of the battery voltage measured preliminarily when a motor-lock is occurring; and a control means that controls a driving of the motor. The control means is configured to decide that the motor is being locked and then stop or decelerate the motor upon detecting that the battery voltage measured through the voltage measurement section is maintained lower than or equal to the reference voltage stored in the storage means for a predetermined period of time during the driving of the motor.

Abstract: A motor device includes an electric motor operated when supplied with power from a rechargeable battery, a voltage detection unit that detects voltage of the rechargeable battery, a determination unit that performs an abnormality determination based on a comparison of the voltage of the rechargeable battery, which is detected by the voltage detection unit, and a determination value, a control unit that controls the operation of the electric motor in accordance with the determination result of the determination unit, and a temperature detection unit that detects the usage environment temperature. The determination unit changes the determination value in accordance with the temperature detected by the temperature detection unit and performs the abnormality determination based on the changed determination value.

Abstract: A rotary tool includes an externally operable operation switch; a motor serving as a power source; a power transfer block for transferring the rotation of the motor; a load detection unit for detecting an amount of load of the motor; and a control unit for controlling the motor. The control unit is configured to perform an operation control by which the motor is controlled so that a rotation speed of the motor is increased in proportion to the operation amount of the operation switch and a feedback control by which the rotation speed of the motor is controlled depending on the detection result of the load detection unit. The control unit inhibits the feedback control during the time when the operation amount of the operation switch is equal to or less than a threshold and performing the feedback control only when the operation amount of the operation switch is greater than the threshold.

Abstract: A battery pack includes a status detection unit for detecting a status of a battery; a switch unit for interrupting a discharging path of the battery; a notification unit for notifying a user of the status of the battery; an operation unit operable by the user; and control unit for opening and closing the switch unit. The control unit is configured to have the switch unit interrupt the discharging path of the battery when the status of the battery detected by the status detection unit is abnormal. Further, the control unit is configured to have the notification unit notify the user of the availability to restart a discharging operation and close the switch unit in response to an operation signal inputted from the operation unit to make the battery pack dischargeable when the status of the battery detected by the status detection unit is recovered from the abnormal status.

Abstract: A charger for an electric power tool includes a charging unit for charging a secondary battery detachably attached to the charger; a notification unit for notifying an operation state of the charging unit by using a combination of a turn-on and turn-off of the notification unit; a brightness reducing unit for reducing a light brightness of the notification unit; and a controller for controlling the notification unit and the brightness reducing unit. If an operation state of the charging unit satisfies a specific condition, the controller controls the brightness reducing unit to reduce the light brightness of the notification unit.

Abstract: The battery pack includes a battery cell for supplying electric power to an external device connected thereto, a temperature sensor for sensing a temperature of a place on which the temperature sensor is arranged, a switch member for making and breaking an electric path between the external device and the battery cell; and a controller configured to control the switch member to turn on and off according to the temperature sensed by the temperature sense. The temperature sensor is arranged on a position between the battery cell and the switch member so as to be affected by the temperatures of both of the battery cell and the switch member.

Abstract: The charger includes: a connector to be connected to a battery; an identification unit configured to perform an identification process of judging whether the battery being connected to the connector is a compliant battery allowed to be directly connected to the connector or a non-compliant battery allowed to be indirectly connected to the connector, and output a result of the identification process; a main charging unit configured to charge the compliant battery according to a main charging condition appropriate to the compliant battery; an auxiliary charging unit configured to charge the non-compliant battery according to an auxiliary charging condition which does not cause a harmful effect on the non-compliant battery; and a control unit configured to receive the result from the identification unit, and, when the result indicates the compliant battery, activate the main charging unit, and, when the result indicates the non-compliant battery, activate the auxiliary charging unit.

Abstract: The battery pack includes: a charging terminal receiving power from a charger while connected to the charger; a battery connected to the charging terminal and recharged by power from the charger via the charging terminal; a protective circuit performing a protective operation of detecting an overcharge of the battery by using power from the battery while receiving a driving signal, and terminating the protective operation when receiving no driving signal; an activation terminal receiving an activation signal from the charger while connected to the charger; an activation circuit connected to the activation terminal and configured to output the driving signal to the protective circuit while receiving the activation signal from the charger via the activation terminal; and an auxiliary activation circuit connected to the charging terminal and configured to provide the driving signal to the protective circuit while the battery receives power from the charger via the charging terminal.

Abstract: The electric tool is powered by a secondary battery as a power source, and includes: an output section configured to be transmitted thereto a rotation of a motor directly or through a decelerator; a voltage measurement section that measures a battery voltage; a storage means that stores, as a reference voltage, a voltage value of the battery voltage measured preliminarily when a motor-lock is occurring; and a control means that controls a driving of the motor. The control means is configured to decide that the motor is being locked and then stop or decelerate the motor upon detecting that the battery voltage measured through the voltage measurement section is maintained lower than or equal to the reference voltage stored in the storage means for a predetermined period of time during the driving of the motor.

Abstract: A battery charger for charging a detachably attached battery pack by supplying an electric power from an external power source, the battery charger includes a notification unit for notifying a user of a charging operation by turning on or flickering a light-emitting member. The notification unit notifies the user of a power connection state of the battery charger by turning on or flickering the light-emitting member immediately after the battery charger is electrically connected to the external power source without attaching the battery pack thereto, and the notification unit turns off the light-emitting member after a predetermined period of time lapses and keeps the light-emitting member in an off-state until the battery pack is attached to the battery charger.

Abstract: An electric tool adaptor is configured to be disposed between an electric tool and a battery pack and attached detachably with respect to the electric tool and the battery pack. This adaptor includes a DC-DC converter configured to increase or reduce a voltage of the battery pack to convert the voltage to a drive voltage of the electric tool and supply the drive voltage to the electric tool.

Abstract: A charger includes an output circuit unit to output a charging current to a secondary battery, a voltage detection unit to detect a voltage of the secondary battery, and a control unit to control the output circuit unit, whereby constant current charging and constant voltage charging are performed. The control unit decreases a constant current value of the charging current by stages during the constant current charging and determines that the secondary battery has deteriorated by using a first voltage drop value of the secondary battery occurring upon first conversion and a second voltage drop value of the secondary battery occurring upon second conversion.

Abstract: A drill 40 for repairing a point defect in a liquid crystal device 10 in accordance with the present invention is the drill 40 for cutting the glass substrate 11 included in the liquid crystal device 10 so as to repair the point defect in the liquid crystal device 10. The drill 40 is characterized by having a point angle PA from 130 to 180 deg.

Abstract: A motor device includes an electric motor operated when supplied with power from a rechargeable battery, a voltage detection unit that detects voltage of the rechargeable battery, a determination unit that performs an abnormality determination based on a comparison of the voltage of the rechargeable battery, which is detected by the voltage detection unit, and a determination value, a control unit that controls the operation of the electric motor in accordance with the determination result of the determination unit, and a temperature detection unit that detects the usage environment temperature. The determination unit changes the determination value in accordance with the temperature detected by the temperature detection unit and performs the abnormality determination based on the changed determination value.

Abstract: An electric power tool is included in a plurality of types of electric power tools. The plurality of types of electric power tools comprise a plurality of types of battery packs having different rated output voltages and a plurality of types of tool bodies, the housings of which are equipped with an attached part on which each of the battery packs is mounted in a freely removable manner. The attached part possessed by the plurality of types of tool bodies equipped with motors having different voltage characteristics is formed so as to be able to mount an arbitrary one of the plurality of types of battery packs having different rated output voltages. This makes it possible to widen the range of available battery packs and enhance convenience.