A power tool system includes a tool body for implementing the function of the power tool and a battery pack detachably connectable to the tool body. The battery pack also includes a housing and a cell assembly disposed in the housing and used for storing or releasing electrical energy. The battery pack also includes a battery management module electrically connected to a detection module and the cell assembly and configured to dynamically adjust a charge parameter of the battery pack or a discharge parameter of the battery pack according to the current cycle count of the battery pack.

A charging system for a battery-operated machine is disclosed. The charging system includes a charging receptacle having a power connection and a signal connection, with the charging receptacle configured to receive electrical current via the power connection from a power supply plug. The charging system further includes a heat rejection element thermally coupled to the charging receptacle, a temperature sensor, and a charging controller operatively coupled to the temperature sensor and the charging receptacle. The charging controller is configured to receive a temperature signal from the temperature sensor, the temperature signal being indicative of a charging-receptacle temperature. The charging controller is further configured to transmit, via the signal connection to the connected plug, a control signal to adjust (e.g., raise or lower) the electrical current supplied to the power connection.

Embodiments of the present application provide a charging and discharging device. The charging and discharging device includes an AC/DC converter, a first DC/DC converter, a second DC/DC converter and a control unit. The control unit is used to: receive a first charging request, the first charging request including a first charging voltage and a first charging current; set output power of the first DC/DC converter based on the first charging voltage and the first charging current; turn on the second DC/DC converter if an SOC of the energy storage unit is greater than a first threshold to charge the battery by the energy storage unit; and adjust output power of the second DC/DC converter, so as to enable a voltage difference between a bus voltage and a bus balance voltage of the charging and discharging device to be less than or equal to a preset value.

A battery pack may include a battery (60), a board (10), a first connection terminal (12), a second connection terminal (11), a control circuit (620), and a busbar (18). The first connection terminal is provided on the board and is configured to be connected to an electric work machine (500). The second connection terminal is provided on the board and is connected to the battery. The control circuit is provided on the board and is configured to control discharging of the battery. The busbar is provided on the board in a current discharge path between the first connection terminal and the second connection terminal.

A method for the open-loop and closed-loop control of a power tool with at least one rechargeable battery, a drive and at least one control device, the rechargeable battery serving as an energy supply for the power tool. The method includes the method steps of: recording at least one temperature value of the rechargeable battery by a temperature measuring device; recording at least one first voltage value of the rechargeable battery by a voltage measuring device; and setting a first performance parameter value of the power tool to a second performance parameter value of the power tool for setting a current intensity value if the recorded temperature value corresponds to a predetermined temperature threshold value and the recorded voltage value corresponds to a predetermined voltage threshold value. A system including a power tool and at least one rechargeable battery for supplying the power tool with electrical energy for carrying out the method.

A method of discharging battery modules of a battery in case of a fault state of at least one of the battery modules, a respective battery module of the plurality of battery modules having at least one battery cell includes, under at least one first condition that at least one first battery cell of a first battery module of the plurality of battery modules has at least one critical state, respective second battery modules, from among the battery modules which are different from the first battery module are at least partly discharged in accordance with an order at least under a second condition. The order depending on a spatial distance between the respective second battery modules different from the first battery module and the first battery module and/or depending on a thermal resistance between the respective battery modules different from the first battery module and the first battery module.

An electronic device according to an embodiment may include: a battery; a connector including multiple pins; and at least one processor, and wherein the at least one processor is configured to: identify an external electronic device electrically connected through the connector, identify, among at least two supportable current values, a current value of power to be supplied to the external electronic device, and supply power of the battery to the external electronic device through the connector based on the identified current value.

The present disclosure provides a power circuit for a battery powered wearable device. The circuit may include a first switch and a second switch successively coupled between the battery of the wearable device and a power output terminal of the power circuit. The circuit may further include a control unit configured to receive a detection signal indicating that a power switch is switched off, and send, after completing required data processing before the wearable device is powered off based on the detection signal, a first control signal to the first switch, to control the first switch to be switched off and cause the second switch to be switched off, thereby cutting off power supply of the battery via the power output terminal.

A power tool system including a battery pack and a power tool. The power tool includes a power tool housing, a drive unit located within the housing, and a power tool controller located within the housing. The power tool controller is configured to receive a signal from the battery pack (for example, a battery pack controller), the signal indicative of a temperature (for example, a temperature of the battery pack); determine whether the temperature is between a lower temperature threshold and an upper temperature threshold; and limit a power to a drive unit if the temperature is between the lower temperature threshold and the upper temperature threshold.

Systems of the present disclosure include an electronic device that manages operations in low temperature environments for improved battery performance. Such management can be based on a temperature and/or a charge level of a battery of the electronic device. When the temperature of the battery is below a threshold, the components of the electronic device can be operated to generate heat until the temperature of the battery is at or above the threshold temperature. The operations can be selected and performed based on available charge in the battery, the minimum temperature change that would raise the temperature of the battery to a temperature threshold, the available temperature change that would be induced by performing one or more operations, user inputs, and the like. Such heat generation can allow the electronic device to remain on and maintain its operations despite exposure to an external environment that presents low temperatures.