Abstract: The present application provide a control method of a power battery heating system. The method includes: controlling all upper bridge arms of a first bridge arm group and all lower bridge arms of a second bridge arm group to be turned on, and controlling all lower bridge arms of the first bridge arm group and all upper bridge arms of the second bridge arm group to be turned off, so as to form a first loop; controlling all the lower bridge arms of the first bridge arm group and all the upper bridge arms of the second bridge arm group to be turned on, and controlling all the upper bridge arms of the first bridge arm group and all the lower bridge arms of the second bridge arm group to be turned off, so as to form a second loop. The method is used to heat the power battery.

Abstract: A charge/discharge circuit includes a power supply module, a switch module, an energy storage module, and a charge-discharge switching module connected in parallel. A first terminal of the energy storage module is connected to the switch module, and a second terminal of the energy storage module is connected to the charge-discharge switching module. The switch module and the charge-discharge switching module are configured to perform an action in response to a charge/discharge enable signal to produce an alternating current in the charge/discharge circuit. A waveform of the alternating current includes at least one of a triangular waveform, a quasi-triangular waveform, a sinusoidal waveform, or a quasi-sinusoidal waveform.

Abstract: A control method may include: controlling a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a first leg, and a second leg set to turn on or off, to form in a first period a circuit loop for a charge/discharge module to discharge to a motor and to form in a second period a circuit loop for the charge/discharge module and the motor to charge a first electric vehicle battery group and a second electric vehicle battery group or form in the second period a circuit loop for the motor to charge the first electric vehicle battery group and the second electric vehicle battery group.

Abstract: Embodiments of the present application provide a battery heating method, a charging device, and a battery management system, which can effectively heat a power battery. The method may be performed by a charging device, the method including: receiving first instruction information from a control device of a power battery before the charging device charges the power battery, where the first instruction information may be used to instruct the charging device to heat the power battery; and heating the power battery according to the first instruction information.

Abstract: A fastener includes a main body having a tubular portion and a split portion that extends from a lower end of the tubular portion, and longitudinally includes a tapered section that tapers in a direction towards the tubular portion. The fastener further includes an expansion sleeve annularly surrounding the split portion, wherein the expansion sleeve longitudinally extends to a lower end of the tapered section.

Abstract: Provided are a battery heating device and a control method and circuit therefor, and a power device. The battery heating device includes: a heating module including a first bridge arm, a second bridge arm, and an energy storage element; and a control module configured to control the first bridge arm and the second bridge arm, to form a circuit for discharging from a first battery cell to the energy storage element and a circuit for charging from the energy storage element and the first battery cell to a second battery cell, and/or to form a circuit for discharging from the second battery cell to the energy storage element and a circuit for charging from the energy storage element and the second battery cell to the first battery cell, for heating of the first battery cell and the second battery cell.

Abstract: A heating circuit for a battery, a control method therefor, a battery, and an electric vehicle are provided. The battery includes a first battery bank and a second battery bank, and the heating circuit includes a switch module, a heating module, and a control module. The switch module is connected to each of the first battery bank and the second battery bank. The heating module is connected to each of the first battery bank, the second battery bank, and the switch module. The control module is connected to each of the switch module and the heating module. The control module is configured to control the switch module to switch the battery to a heating state, and is configured to control the heating module when the battery is in the heating state, such that the first battery bank, the heating module, and the second battery bank form a loop.

Abstract: Embodiments of this application provide a thermal management method and a thermal management system. The thermal management method is applied to a thermal management system including a heating apparatus, a battery pack, and a pipeline subsystem. The pipeline subsystem is in thermal contact with the heating apparatus and the battery pack. The thermal management method includes: measuring temperature of the heating apparatus and battery pack temperature of the battery pack under the condition that the heating apparatus is in operating state; and transferring heat from the heating apparatus to the battery pack via the pipeline subsystem under the condition that the temperature of the heating apparatus is higher than the battery pack temperature. According to the embodiments of this application, the thermal management efficiency can be improved and the thermal management costs can be reduced.

Abstract: A control method may include: controlling a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a first leg, and a second leg set to turn on or off, to form in a first period a circuit loop for a charge/discharge module to discharge to a motor and to form in a second period a circuit loop for the charge/discharge module and the motor to charge a first electric vehicle battery group and a second electric vehicle battery group or form in the second period a circuit loop for the motor to charge the first electric vehicle battery group and the second electric vehicle battery group.

Abstract: A charge method includes obtaining a temperature of a battery, and in response to the temperature of the battery being lower than a preset temperature threshold, determining to use a first charge current to charge the battery until the battery meets a preset condition, and then determining to use a second charge current to charge the battery. The first charge current is used for heating the battery during charging, and the first charge current is greater than the second charge current.

Abstract: A battery heating apparatus configured to be connected to a traction battery and heat the traction battery. The battery heating apparatus includes a heating module including a first leg, a second leg, and an energy storage element, and a control module configured to control the first leg and the second leg to form a loop via which the traction battery discharges to the energy storage element and a loop via which the energy storage element charges the traction battery, so as to heat the traction battery during discharge and charge.

Abstract: A traction battery heating circuit, system, and control method, and an electric device are provided. In some embodiments, the traction battery heating circuit includes: a power supply module, including at least one battery group; an inverter module, connected to the power supply module and including an M-phase leg circuit, where the leg circuit is connected in parallel to the battery group, and M is an even multiple of three; a driving module, including a motor having M windings, where the M windings are respectively connected to M phase legs of the leg circuit in one-to-one correspondence; and a control module, connected to the leg circuit, configured to control upper legs of at least three phase legs in the leg circuit and lower legs of the same number of phase legs in remaining legs to be turned on.

Abstract: Embodiments of this application provide a DC/DC conversion circuit, a power unit, a charging pile, and a charge-discharge heating method. The circuit includes: a first rectifier module, where an input end of the first rectifier module is connected to a power grid through an AC/DC conversion circuit; a transformer module, where an input end of the transformer module is connected to an output end of the first rectifier module; an energy storage module; and a second rectifier module, where an input end of the second rectifier module is configured to connect to an output end of the transformer module or the energy storage module, and an output end of the second rectifier module is configured to connect to a battery pack of an electric vehicle when the charging pile is charging the electric vehicle.

Abstract: A battery heating control method includes collecting a battery parameter of a battery module, in response to the battery parameter of the battery module meeting a preset heating condition, controlling a traction battery and a feed battery of the battery module to charge and discharge each other so that the battery module is heated through mutual charge and discharge of the traction battery and the feed battery, and controlling the traction battery of the battery module to power a motor of a vehicle.

Abstract: 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.

Abstract: A self-heating control circuit includes a control module configured to obtain a cell temperature of each of two battery packs connected in parallel and send a trigger signal in response to the cell temperature being lower than a threshold. The two battery packs include a first battery pack and a second battery pack. The control circuit further includes a switch module disposed at a charging and discharging circuit of the first battery pack. A control terminal of the switch module is connected to the control module and is configured to cut off the charging and discharging circuit upon reception of the trigger signal. The control circuit also includes an excitation module configured to form a path with the two battery packs upon cut-off of the charging and discharging circuit, and generate an excitation current, so that the excitation current flows back and forth between the two battery packs.

Abstract: The embodiments of the present disclosure provide a control method, a device, a power system, and an electric vehicle. The method is applied to a motor controller of the power system. The power system further includes a power battery, a motor, and an inverter. The method includes: sending a first control signal to the inverter when a cell temperature of the power battery satisfies a preset heating condition for the power battery; where the first control signal is configured to control the inverter to convert an electricity provided by the power battery into an alternating current with a frequency changing randomly, and the alternating current with the frequency changing randomly is configured to supply power to the motor.

Abstract: Disclosed is a motor, a control method, a power system, and an electric vehicle. Each phase stator winding of the motor includes two sub-winding sets. When a traction battery needs to be heated, the two sub-winding sets of the motor store electrical energy and provide alternating currents to the traction battery through an inverter, so that the traction battery uses its internal resistance for heating. In addition, the two sub-winding sets generate opposite magnetic fields which cancel each other out, so that the strength of the magnetic field inside each phase stator winding and the air gap magnetic flux are reduced, thereby alleviating the heat generation and NVH problems of the motor.

Abstract: Disclosed is a traction battery self-heating control method and a device. Acquiring a second temperature of a rotor at a current sampling time according to system parameters and a first temperature of the rotor at a previous sampling time, and estimating a third temperature of the rotor at a next sampling time according to the first temperature and the second temperature, and stopping the self-heating of the traction battery when the third temperature reaches a demagnetization temperature of the rotor. Whether to stop the self-heating of the traction battery is determined by estimating a rotor temperature under the self-heating condition, and comparing the rotor temperature with the demagnetization temperature of the rotor, and thus the self-heating control of the traction battery is realized.

Abstract: The present application relates to a method for heating a battery pack, where the battery pack is connected to an inductive load via a converter and the method includes: controlling on and off of a switch module in the converter upon receiving a heating request, so as to control discharging and charging between the battery pack and the inductive load, connecting the battery pack and an auxiliary heating mechanism in parallel during a discharging stage of the battery pack; and disconnecting the auxiliary heating mechanism from the battery pack during a charging stage of the battery pack. The present application further relates to a battery heating system and an electric apparatus.