Abstract: A chainsaw includes a chain, a liquid pump assembly, a motor, and a controller. The chain is used for implementing a cutting operation. The liquid pump assembly includes a liquid pump and a motor. The liquid pump is used for releasing a liquid for lubricating or cooling the chain. The motor is used for at least driving the liquid pump to operate. The controller is electrically connected to at least the motor. The controller is configured to, when the liquid pump is in the jammed state, control the liquid pump assembly to enter a throttling mode in which a supplied amount of the liquid is reduced, and when the liquid pump exits the jammed state, control the liquid pump assembly to exit the throttling mode. Technical solutions provided by the present application can determine and release the jammed state of the chainsaw.

Abstract: A battery pack includes a housing; a cell assembly including multiple stacked cell units; elastic pads separately disposed between adjacent ones of the multiple cell units, where air cavities are formed between the elastic pads and the adjacent ones of the multiple cell units; a sealing member disposed at least on the surface of the cell assembly, where the sealing member and the housing form a sealed chamber; and an air-permeable element partially disposed on the side surface of the cell assembly and extending into multiple air cavities along the first direction, where the air-permeable element connects with the air outside the sealed chamber.

Abstract: A power tool includes a housing, a brushless motor disposed inside the housing, and a controller. The controller is configured to receive power-off signals and power-on signals. Upon receiving a power-on signal, the controller is further configured to receive a time signal indicative of a time interval from the last power-off signal to the current power-on signal. The controller is further configured to determine whether the time interval is greater than or equal to a first time threshold and less than a second time threshold, and brake the motor before start-up if the time interval is greater than or equal to the first time threshold and less than the second time threshold.

Abstract: The present disclosure provides an open-air circulating pool for simulating ecological damage, and belongs to the technical field of simulation tests of ecological environment impact. The open-air circulating pool is provided with a set of devices for simulating natural ecological environments of different water quality and sediments, as well as changes in water bodies caused by a sea occupation project, discharge of a typical pollution source and a sudden leakage accident, so as to observe changing trends of an aquatic organism and an environmental element, and qualitatively and quantitatively determine a law of causality of damage. The set of devices includes an open-air wave-flow circulating pool, an additive injection apparatus and an ecological indicator sampling and detection apparatus.

Abstract: A power tool includes a main body and a battery pack. The main body includes a housing and a motor, a switch assembly, and an electronic control device. The electronic control device is electrically connected to the switch assembly and the motor. The electronic control device includes an electronic control assembly, a mounting base, and a connecting assembly. The electronic control assembly includes a power circuit board. The power circuit board is provided with an opening. The connecting assembly conductively connects the battery pack to the electronic control assembly, connects to the mounting base via the opening, and mates with the mounting base to form a mounting space in which the electronic control assembly is mounted.

Abstract: A battery pack includes a plurality of cells, a first detection unit configured to detect a first electrical parameter of a cell, a second detection unit configured to detect a second electrical parameter of a cell group, a storage unit at least configured to store a third electrical parameter of the cell, and a control unit configured to acquire the first electrical parameter, the second electrical parameter, and the third electrical parameter, dynamically adjust a discharge capacity parameter of the battery pack based on the third electrical parameter, the first electrical parameter, and the second electrical parameter, and transmit the discharge capacity parameter to a load connected to the battery pack to enable the load to adjust the current operating state based on the discharge capacity parameter.

Abstract: A power tool includes a housing, a brushless motor disposed inside the housing, and a controller. The controller is configured to receive power-off signals and power-on signals. Upon receiving a power-on signal, the controller is further configured to receive a time signal indicative of a time interval from the last power-off signal to the current power-on signal. The controller is further configured to determine whether the time interval is greater than or equal to a first time threshold and less than a second time threshold, and brake the motor before start-up if the time interval is greater than or equal to the first time threshold and less than the second time threshold.

Abstract: A power tool that is powered by a battery pack includes a function member, a motor, a motor driving circuitry, an energy storage component, an electromagnetic switch, and a power-off protection module. The electromagnetic switch includes a coil, a first switch electrically connected to the coil and configured to turn on and off an electrical connection between the coil and the battery pack, and a second switch electrically connected to the motor driving circuitry and configured to turn on and off an electrical connection between the battery pack and the motor driving circuitry. The power-off protection module is electrically connected to the coil and to the energy storage component and is configured to cut off an electrical connection between the coil and the energy storage in response to the power tool and the battery pack being electrically disconnected.

Abstract: The present disclosure provides an open-air circulating pool for simulating ecological damage, and belongs to the technical field of simulation tests of ecological environment impact. The open-air circulating pool is provided with a set of devices for simulating natural ecological environments of different water quality and sediments, as well as changes in water bodies caused by a sea occupation project, discharge of a typical pollution source and a sudden leakage accident, so as to observe changing trends of an aquatic organism and an environmental element, and qualitatively and quantitatively determine a law of causality of damage. The set of devices includes an open-air wave-flow circulating pool, an additive injection apparatus and an ecological indicator sampling and detection apparatus.

Abstract: A power tool includes a tool accessory, a motor, a control module, a power supply, and an operating switch. The operating switch includes a trigger mechanism, a current switch coupled to the trigger mechanism to be actuated by the trigger mechanism for connecting and disconnecting the electrical connection between the power supply module and the motor, and a signal switch coupled to the trigger mechanism to be actuated by the trigger mechanism at least configured to output a control signal to the control module to control the start of the motor.

Abstract: A control circuit for a motor has a driving state and a braking state and includes a driving branch and a braking branch. The driving branch includes a branch formed by a stator winding and a rotor. The braking branch includes a branch formed by the stator winding, a braking switch, and an electrical energy storage component. The electrical energy storage component is configured to provide an electrical energy to the braking branch. When the motor is in the braking state, if the braking branch is detected as short-circuited, the connection between the stator winding and the rotor of the driving branch is turned on. Further provided is a power tool including the above control circuit.

Abstract: A circular saw includes a control unit having a signal processing unit. The signal processing unit is configured to collect a bus current and/or a phase current of the motor and output a second drive signal to the drive circuit after the bus current and/or the phase current of the motor is processed by the signal processing unit, so that the motor charges a battery pack with a charging current less than or equal to 50 A. A control method may independently adjust the current of the motor in the circular saw by optimizing the processing for the phase current and/or the bus current of the motor and feed back electric energy generated by the motor to the power supply to optimize the utilization efficiency of the power supply.

Abstract: A power tool that is powered by a battery pack includes a function member, a motor, a motor driving circuitry, an energy storage component, an electromagnetic switch, and a power-off protection module. The electromagnetic switch includes a coil, a first switch electrically connected to the coil and configured to turn on and off an electrical connection between the coil and the battery pack, and a second switch electrically connected to the motor driving circuitry and configured to turn on and off an electrical connection between the battery pack and the motor driving circuitry. The power-off protection module is electrically connected to the coil and to the energy storage component and is configured to cut off an electrical connection between the coil and the energy storage in response to the power tool and the battery pack being electrically disconnected.

Abstract: A control circuit for a motor has a driving state and a braking state and includes a driving branch and a braking branch. The driving branch includes a branch formed by a stator winding and a rotor. The braking branch includes a branch formed by the stator winding, a braking switch, and an electrical energy storage component. The electrical energy storage component is configured to provide an electrical energy to the braking branch. When the motor is in the braking state, if the braking branch is detected as short-circuited, the connection between the stator winding and the rotor of the driving branch is turned on. Further provided is a power tool including the above control circuit.

Abstract: An angle grinder includes a motor including a rotor and windings, a power supply for supplying power to the motor, a main switch for turning on/off an electrical connection between the windings of the motor and the power supply, an output shaft driven by the rotor to rotate, a rotor brake circuit for slowing down the rotor of the motor when the windings are short circuited or reverse connected, an output shaft brake circuit for producing a magnetic field to slow down the output shaft and a controller for detecting whether the rotor brake circuit short circuits or reverse connects with the windings. When the windings are short circuited or reverse connected for a time which reaches a preset value, the output shaft brake circuit produces the magnetic field to slow down the output shaft.

Abstract: An angle grinder includes a motor including a rotor and windings, a power supply for supplying power to the motor, a main switch for turning on/off an electrical connection between the windings of the motor and the power supply, an output shaft driven by the rotor to rotate, a rotor brake circuit for slowing down the rotor of the motor when the windings are short circuited or reverse connected, an output shaft brake circuit for producing a magnetic field to slow down the output shaft and a controller for detecting whether the rotor brake circuit short circuits or reverse connects with the windings. When the windings are short circuited or reverse connected for a time which reaches a preset value, the output shaft brake circuit produces the magnetic field to slow down the output shaft.

Abstract: A tool discharges one battery pack and a charger simultaneously charges another battery pack to provide for continuous and circular operation of the tool. Tool system includes a tool and a lithium based battery pack having a nominal voltage of at least 56 volts for supplying power to the tool. A heat absorbing device is associated with the battery pack and includes a phase-change material.

Abstract: A battery pack, a method for detecting the battery pack, a charging assembly, and an electric tool are provided for detecting voltage and disconnection of the battery cells. The battery pack may have an output voltage of at least 56V and may include a plurality of series connection units. A voltage detecting module may be utilized for detecting voltage in the battery pack. A battery control module configured to control voltage detecting module may also be employed. The method may involve determining whether the series connection units are disconnected based on rates of voltage change or internal-resistance of the series connection units.

Abstract: A tool discharges one battery pack and a charger simultaneously charges another battery pack to provide for continuous and circular operation of the tool. Tool system includes a tool and a lithium based battery pack having a nominal voltage of at least 56 volts for supplying power to the tool. A heat absorbing device is associated with the battery pack and includes a phase-change material.

Abstract: A charging assembly and a charging control method are provided for charging a battery pack according to an actual voltage of a battery in a battery pack. The charging assembly includes a battery pack having a battery with a rated charging current, a charger having a charging module for outputting an output voltage and an output current, and a charging circuit between the charging module and the battery. A method of operation includes: detecting the output current and the output voltage; calculating an actual voltage value on the battery; and determining whether to decrease or keep the output current or increase the output current of the charging module.