An electronic device, a first terminal of a first power supply is electrically connected to a first power supply end of a to-be-powered component, and a second terminal of the first power supply is electrically connected to a first end of a first metal conductive part. A cover body is detachably connected to a first assembly. When the cover body covers the first assembly, a first magnet interacts with a second magnet so that the second magnet is electrically isolated from at least one of a second end of the first metal conductive part and a second power supply end of the to-be-powered component. When the cover body does not cover the first assembly, the second magnet is electrically connected to the first metal conductive part and the second power supply end.

The present disclosure provides a charging and discharging method for series-parallel batteries applied to a series-parallel battery system including series-parallel batteries and a mainboard, the series-parallel batteries are connected to the mainboard and include at least two batteries that are connected to each other, and the method includes: determining and adjusting a connection mode of each battery of the series-parallel batteries according to a charging or discharging demand type; and charging or discharging the series-parallel batteries according to the connection mode of each battery of the series-parallel batteries. The present disclosure further provides a series-parallel battery system.

The present disclosure provides a charging and discharging method for series-parallel batteries applied to a series-parallel battery system including series-parallel batteries and a mainboard, the series-parallel batteries are connected to the mainboard and include at least two batteries that are connected to each other, and the method includes: determining and adjusting a connection mode of each battery of the series-parallel batteries according to a charging or discharging demand type; and charging or discharging the series-parallel batteries according to the connection mode of each battery of the series-parallel batteries. The present disclosure further provides a series-parallel battery system.

A secondary battery protection circuit includes a potential-difference control circuit. The potential-difference control circuit provides, when overcharge is detected by an overcharge detection circuit, a control terminal of a charge control transistor with feedback on a potential-difference detection signal to control a potential difference between an electrode of a secondary battery and a terminal for a load and charger. The potential-difference control circuit provides, when overdischarge is detected by an overdischarge detection circuit, a control terminal of each of the charge control transistor and a discharge control transistor with feedback on the potential-difference detection signal to control the potential difference.

A power tool battery charging station (1) in the form of a mobile pod. The station/pod (1) includes a housing (2) and a plurality of compartments (3). Each compartment (3) has a lockable door (4), and a cutout (5) through which an electrical cord may be provided. Ventilation cutouts (7) may additionally be provided in the housing (2). The housing (2) incorporates a plurality of electrical outlets (6), each adapted to receive a plug of a respective power tool battery. The housing (2) additionally incorporates a circuit breaker operatively connected to the electrical outlets (6).

Embodiments herein provide an electrical protection circuit (100) for connecting an Energy Storage Unit, ESU (10) to a main power line (80). The electrical protection circuit (100) comprises first and second main terminals configured to be connected to a main power line, first and second ESU terminals connected to the ESU (10). The first main terminal is connected to the first ESU terminal via a first normally closed, NC, switch (20). The first main terminal is connected to the second main terminal via a normally open, NO switch (40). The first NC switch (20) is configured to be opened thereby to disconnect the ESU (10) from the main power line (80), and the NO switch (40) is configured to be closed thereby to bypass the ESU (10) from the main power line (80) in order to achieve electrical protection for the ESU (10).

A power supply circuit and a related apparatus, used in the field of terminal technologies, are provided. The power supply circuit includes: an EIS module connected to a battery, a controller, and a power management module. The EIS module is connected to the controller, and the controller is connected to the power management module. The EIS module may detect an internal resistance of the battery and transmit the internal resistance of the battery to the controller. The controller may obtain a charge cutoff voltage and/or a charge cutoff current of the battery according to the internal resistance of the battery, and send a first control signal to the power management module. The power management module may control the charge cutoff voltage and/or the charge cutoff current of the battery according to the first control signal.

An apparatus for protecting a battery pack, includes: a battery module; a relay to apply an output of the battery module to a load of a vehicle, or block the output of the battery module; an actuator to operate by a power supplied from a starter battery; and a processor to: monitor the battery module when a start signal is input to detect a failure of the relay; and if the failure of the relay is detected, control the actuator to discharge the starter battery and block a start of the vehicle.

The present disclosure relates to a charging and discharging device comprising: a sensing portion obtaining a status information of a battery cell, and a controller determining whether the battery cell is abnormal using the status information, wherein the controller determines whether the battery cell is abnormal based on comparing a first status information of the battery cell obtained in the N1th, where N is a natural number of 2 or more, charging cycle of the battery cell and a second status information of the battery cell obtained in the Nth charging cycle following the N1th charging cycle of the battery cell.

A power conversion apparatus and an energy storage apparatus. The power conversion apparatus includes a switch module, a power conversion module, a first processing module, and a second processing module, the power conversion module receives, by using the switch module, power discharged by a battery or charges the battery by using the switch module, the first processing module outputs a first on signal and a first start signal, and the second processing module outputs a second on signal and a second start signal. In response to the first on signal and the second on signal, the switch module connects the power conversion module to the battery. In response to the first start signal or the second start signal, the power conversion module starts. The first processing module and the second processing module are backups of each other.