A charging device for charging a lithium-ion secondary battery based on at least a constant voltage method is provided. In the charging device, before starting charging with a constant voltage or while performing charging with a constant voltage, a first current pulse having a peak current value i.sub.1 larger than a charge current value i.sub.0 is applied at least once.

A precharge system and method are provided. The precharge system comprises a load circuit, a precharge circuit and a control circuit. The load circuit comprises an input terminal, an input switch and a bus capacitor. The precharge circuit comprises a precharge resistor and a precharge switch. The precharge method comprises: during the load circuit being in a precharge mode, controlling the input switch to be in an off state, and controlling the precharge switch to switch between the on and off state for multiple times; and during the load circuit being in a work mode, controlling the input switch to be in an on state. During the load circuit being in the precharge mode, when the precharge switch is in the on state, a consuming power of the precharge resistor is larger than a threshold power and is smaller than or equal to a limit power of the precharge resistor.

According to various embodiments, an electronic device may include: a housing, a battery, at least one sensor, a charging circuit, and at least one processor, wherein the at least one processor is configured to: control the charging circuit to charge the battery with a first charging current through the charging circuit, measure a temperature associated with the electronic device using the at least one sensor while charging the battery with the first charging current, based on the temperature associated with the electronic device being equal to or higher than a first threshold temperature, decrease the first charging current to be a second charging current and charge the battery with the second charging current, and based on the temperature associated with the electronic device being below a second threshold temperature lower than the firstSAVE threshold temperature while charging the battery with the second charging current, decrease the first charging current and charge the battery with the decreased charging current, wherein the battery is configured to be charged with the first charging current decreased based on a number of times the first charge current has been decreased, the temperature associated with the electronic device being below the first threshold temperature.

The present disclosure provides a charging system and method and a power adapter. The system includes: a battery; a first rectification unit, configured to output a voltage with a first pulsating waveform; a switch unit, configured to modulate the voltage with the first pulsating waveform; a transformer, configured to output a voltage with a second pulsating waveform according to the modulated voltage; a second rectification unit, configured to rectify the voltage with the second pulsating waveform to output a voltage with a third pulsating waveform; and a control unit, configured to output the control signal to the switch unit to decrease a length of a valley of the voltage with the third pulsating waveform such that a peak value of a voltage of the battery is sampled.

A charging power control method, including: acquiring a heat dissipation parameter of a power-transmitting device, where the heat dissipation parameter is used for indicating the heat dissipation capacity of the power-transmitting device when charging a power-receiving device; acquiring a demand parameter of the power-receiving device, where the demand parameter is used for indicating the charging power demand of the power-receiving device; acquiring a target power control algorithm according to the heat dissipation parameter and the demand parameter; and according to the target power control algorithm, controlling the charging power at which the power-transmitting device charges the power-receiving device.

The present application provides a charging control method and apparatus, a battery management system and a readable storage medium. The charging control method includes: obtaining a battery temperature and a battery state of charge; determining a pulse charging frequency according to the battery temperature, the battery state of charge and a pre-calibrated corresponding relationship; obtaining a preset waveform characteristic of a pulse charging waveform; where the waveform characteristic includes a ratio range of an area of a positive pulse waveform to an area of a negative pulse waveform in each pulse cycle of the pulse charging waveform; and generating a charging request according to the pulse charging frequency and the waveform characteristic and transmitting the charging request to a charging device. The method is used for improving charging stability and safety of a battery.

Disclosed are devices and methods for performing wireless charging of an electronic device and establishing a wireless connection with a plurality of electronic devices for data transfer. Different modes of wireless data transfer can be used to ensure that the power supply of the electronic device is charged without interruption.

According to one aspect of the present disclosure, an energy storage system includes one or more power sources, one or more energy storage components, and one or more solid state circuit breakers disposed between the one or more power sources and the one or more energy storage components such that electrical power is exchanged between the one or more power sources to the one or more energy storage components through the one or more solid state circuit breakers. The energy storage system also includes a controller configured to operate the one or more solid state circuit breakers to control current exchanged with the one or more energy storage components and protect the one or more energy storage components from the one or more power sources during a fault condition.

An uninterruptible power supply device includes a bidirectional chopper that converts a first DC voltage supplied from a battery into a second DC voltage and supplies the second DC voltage to an inverter when a power failure of a commercial AC power supply occurs. The bidirectional chopper includes a capacitor that stabilizes the second DC voltage. The uninterruptible power supply device further includes: a current detector that detects an output current of the battery; and a control circuit that, based on a detection result by the current detector, calculates an estimated temperature increase value of the capacitor every time a predetermined time period elapses, and stops an operation of the bidirectional chopper when the calculated estimated temperature increase value is higher than an upper limit value.

The present invention discloses a circuit having balanced charging and cell connection conversion functions. The circuit according to the present invention includes n cell groups, n−1 third switching circuits, and a master control unit, where n is an integer greater than 1. Each of the cell groups includes a first switching circuit, a cell, and a second switching circuit that are connected in series in sequence. The first switching circuit is connected between a positive wire and a positive terminal of the cell. The second switching circuit is connected between a negative wire and a negative terminal of the cell. Each of the third switching circuits is connected between a positive terminal and a negative terminal of two cells adjacent to each other. The master control unit controls turn-on/turn-off of the first switching circuits, the second switching circuits, and the third switching circuits by sending a control signal on a control bus, to enable switching of a serial/parallel connection of the n cell groups.