Abstract: A hierarchical health index evaluation method for an intelligent substation includes: obtaining a basic health index of a device based on static information and dynamic information of the device; obtaining a device correlation based on a communication connection relationship between the device and another device, and correcting the basic health index of the device based on the device correlation to obtain a health index of the device; obtaining a layer-based health index of a layer based on a device health index and a device importance weight of the layer; obtaining a whole-station health index of an intelligent substation based on a layer-based health index of each layer and a sum of device importance weights of each layer; and regulating the intelligent substation based on a health index of each device in the intelligent substation, the layer-based health index of each layer, and the whole-station health index.

Abstract: A charging system includes at least one first charging device and at least one second charging device that are cascaded. The first charging device includes at least one first accommodation portion for mounting a first energy storage device and a connecting port for connecting the second charging device or the first charging device. The second charging device includes at least one second accommodation portion for mounting a second energy storage device and a connecting port for connecting the first charging device or the second charging device. The first accommodation portion and the second accommodation portion have different shapes or dimensions.

Abstract: A charging system includes at least one first charging device and at least one second charging device that are cascaded. The first charging device includes at least one first accommodation portion for mounting a first energy storage device and a connecting port for connecting the second charging device or the first charging device. The second charging device includes at least one second accommodation portion for mounting a second energy storage device and a connecting port for connecting the first charging device or the second charging device. The first accommodation portion and the second accommodation portion have different shapes or dimensions.

Abstract: A charging system includes at least one first charging device and at least one second charging device that are cascaded. The first charging device includes at least one first accommodation portion for mounting a first energy storage device and a connecting port for connecting the second charging device or the first charging device. The second charging device includes at least one second accommodation portion for mounting a second energy storage device and a connecting port for connecting the first charging device or the second charging device. The first accommodation portion and the second accommodation portion have different shapes or dimensions.

Abstract: An adapter includes: a housing; a battery pack port for accessing a battery pack; a device port including multiple USB-type ports capable of accessing an electric device or a charging apparatus; a protocol matching module configured to perform a protocol handshake with the electric device or the charging apparatus; and a bidirectional DC-DC conversion module capable of converting electrical energy outputted by the battery pack into direct current power supply electrical energy or converting electrical energy from the charging apparatus into direct current charging electrical energy. The bidirectional DC-DC conversion module includes: a power switching element disposed on the power transmission loop between the battery pack port and the device port and capable of adjusting electrical energy in the power transmission loop; and a power control unit electrically connected to the power switching element and capable of controlling the conducting state of the power switching element.

Abstract: A battery pack includes a housing, a cell group, an interface disposed on the housing so as to be connected to a charger or a power tool. The interface includes a first terminal electrically connected to a first electrode of the cell group, a second terminal electrically connected to the first electrode of the cell group, and a third terminal electrically connected to a second electrode of the cell group. The battery pack includes a first interrupt circuit disposed on a discharging loop, a second interrupt circuit disposed on a charging loop, and a control unit connected to the second interrupt circuit. The second interrupt circuit has an on state and an off stat. The control unit outputs, under a preset condition, a control signal to the second interrupt circuit such that the second interrupt circuit switches from the on state to the off state.

Abstract: A battery pack of a power tool includes a plurality of cells connected in series, a controller, which is configured to detect a charge current and/or a discharge current of the plurality of cells, estimate remaining capacity of the plurality of cells at least base on an integral of the charge current and/or the discharge current of the plurality of cells over time and generate or select a power supply capability parameter for limiting power of the power tool at least base on the remaining capacity of the plurality of cells, and a memory, which is configured to store data related to the remaining capacity of the plurality of cells.

Abstract: A battery pack is detachably connectable to an electric tool or a charger and includes a housing, a cell group, a first voltage monitoring module, a control module, a second voltage monitoring module and a protection module. The cell group includes a plurality of cells electrically connected to each other. The first voltage monitoring module monitors at least one of the voltage of each cell or the total voltage of the cell group. The second voltage monitoring module monitors the voltage of each cell to detect whether the cells are in an overvoltage state. The protection module is electrically connected to the second voltage monitoring module and when the second voltage monitoring module monitors that any one of the cells is in the overvoltage state, cuts off a charging path formed between the battery pack and the charger.

Abstract: Provided are a battery pack and a charging method for the same. The battery pack includes at least one cell set including multiple cells connected in series. The charging method includes detecting a temperature of the battery pack under a preset state and a voltage of each of the multiple cells, the preset state being a state in which a charging circuit is disconnected and the battery pack is inserted in a charger after the battery pack has been fully charged, calculating a voltage difference between at least two cells in the battery pack based on the voltage of each cell, and determining whether to activate a balancing operation based on the voltage difference and the temperature.

Abstract: A battery pack is detachably connectable to an electric tool or a charger and includes a housing, a cell group, a first voltage monitoring module, a control module, a second voltage monitoring module and a protection module. The cell group includes a plurality of cells electrically connected to each other. The first voltage monitoring module monitors at least one of the voltage of each cell or the total voltage of the cell group. The second voltage monitoring module monitors the voltage of each cell to detect whether the cells are in an overvoltage state. The protection module is electrically connected to the second voltage monitoring module and when the second voltage monitoring module monitors that any one of the cells is in the overvoltage state, cuts off a charging path formed between the battery pack and the charger.

Abstract: A grass trimmer has a main body and a trimming device. The main body has an operating device and a power source. The trimming device has a grass cutting assembly having a cutting member and a power head for rotating the cutting member. The power head has a housing, a rotor assembly and a stator assembly. The housing is formed integrally and defines an accommodation chamber. The rotor assembly is received in the accommodation chamber of the housing and has a rotor sleeve which rotates around an axis. The stator assembly is at least partly received in the rotor sleeve. The rotor assembly further has two or more magnetic pieces disposed at an inner wall of the rotor sleeve. The stator assembly has a stator support and a coil assembly. The stator support includes a mounting portion and a supporting portion. The coil assembly is disposed in the rotor sleeve by the supporting portion.

Abstract: A battery pack of a power tool includes a plurality of cells connected in series, a controller, which is configured to detect a charge current and/or a discharge current of the plurality of cells, estimate remaining capacity of the plurality of cells at least base on an integral of the charge current and/or the discharge current of the plurality of cells over time and generate or select a power supply capability parameter for limiting power of the power tool at least base on the remaining capacity of the plurality of cells, and a memory, which is configured to store data related to the remaining capacity of the plurality of cells.

Abstract: A charging system includes a first battery pack having a first capacity, a second battery pack having a second capacity and a charger for charging the first battery pack and the second battery pack. When the first battery pack is charged by the charger at a predetermined charging current I, a first charging time in which the first battery pack reaches a predetermined temperature T is set as a predetermined time t. When the second battery pack is charged by the charger at the predetermined charging current I, and when a second charging time of the second battery pack reaches the predetermined time t, the second battery pack is charged at a lower charging current. The first capacity is less than the second capacity.

Abstract: A power toolcapable of being balance powered by multiple battery packs is provided. A power tool comprising: a motor; a first battery pack; a second battery pack; a first battery receptacle for receipt of the first battery pack; a second battery receptacle for receipt of the second battery pack; a first switch device for connecting to the first battery pack and the motor; a second switch device for connecting to the second battery pack and the motor; and a controller operable to send a signal to cause the switch device opened so as to disconnect the battery pack and the motor when the voltage of the switch device is less than a control voltage.

Abstract: A discharge protection circuit has a cell combination with more than one cell, a power supply circuit, an output circuit, a MCU chip, a voltage detection circuit, a NTC circuit, a current detection circuit, a drive circuit and a drive switch. The power supply circuit, the output circuit and the cell combination form a series connection and the MCU chip forms an electrical connection with the voltage detection circuit, the drive circuit and the current detection circuit, respectively, with the voltage detection module being electrically connected with the cell combination and the NTC circuit respectively. A control method includes enabling a discharge procedure of the discharge protection circuit to discharge with a power quantity 0.2 times nominal power quantity each hour. In this procedure, the MCU chip is cyclically dormant to reduce the control power dissipation and improve discharge quantity while achieving discharge protection of the battery pack.

Abstract: An electrical combination includes a power tool and battery pack. The battery pack includes a detection terminal and a normal terminal, two detection circuits, and a control module for respectively connecting with the two terminals. The control module can detect and compare voltage signals in the detection circuits. One detection circuit is used to provide a comparing reference and the other detection circuit is used as a circuit of the terminals and to apply the same voltage on the terminals. A difference between voltages sampled from voltage sampling points and a predetermined value is compared to determine whether the resistance of the terminals is increased. The method can help to decide whether the connection of terminals is good or not.

Abstract: A power tool capable of being balance powered by multiple battery packs is provided. A power tool comprising: a motor; a first battery pack; a second battery pack; a first battery receptacle for receipt of the first battery pack; a second battery receptacle for receipt of the second battery pack; a first switch device for connecting to the first battery pack and the motor; a second switch device for connecting to the second battery pack and the motor; and a controller operable to send a signal to cause the switch device opened so as to disconnect the battery pack and the motor when the voltage of the switch device is less than a control voltage.

Abstract: A power supply device includes a battery pack for storing electric energy and an adapter for outputting the electric energy stored in the battery pack. The battery pack includes a battery controller for detecting the voltage of the battery pack. The adapter includes an adapter controller for receiving a signal sent by the battery controller and stopping the adapter outputting the electric energy when a length of time that the battery pack has the voltage less than a predetermined voltage threshold reaches a predetermined length of time.

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 charging system includes a first battery pack having a first capacity, a second battery pack having a second capacity and a charger for charging the first battery pack and the second battery pack. When the first battery pack is charged by the charger at a predetermined charging current I, a first charging time in which the first battery pack reaches a predetermined temperature T is set as a predetermined time t. When the second battery pack is charged by the charger at the predetermined charging current I, and when a second charging time of the second battery pack reaches the predetermined time t, the second battery pack is charged at a lower charging current. The first capacity is less than the second capacity.