A portable energy storage device capable of simultaneous multi-port charging and discharging and method for allocating charging and discharging power, wherein the energy storage device includes a power allocation unit, at least two power input ports, and at least two charging output ports, wherein the power allocation unit is used for allocating power to the power input ports connected to the charging device and the charging output ports connected to the receiving device, and the maximum permissible operating power of the energy storage device in charging and discharging mode is defined as P.sub.max. By distributing the power of the power input port and the charging output port, the portable energy storage device is enabled to meet the demand for simultaneous charging and simultaneous power supply, ensuring a good user experience.

A battery charging/discharging control system and an electronic device, which relate to the technical field of battery charging/discharging. The control system includes: a positive power supply terminal, a negative power supply terminal, a positive battery terminal, a negative battery terminal, a charging/discharging circuit, and a controllable switching circuit. The charging/discharging circuit includes a first sample resistance circuit and a battery protection chip. One end of the first sample resistance circuit is connected to the negative power supply terminal, and there is a first node between the end of the first sample resistance circuit and the negative power supply terminal; and the other end of the first sample resistance circuit is connected to the negative battery terminal. The battery protection chip comprises an overcurrent detection pin, the overcurrent detection pin is connected to the first node.

A power supply system with a large number of battery modules, wherein each battery module has a first electrical connection and a second electrical connection, via which the battery modules are connected in series in an interconnection branch of the power supply system. Each battery module also has an accumulator which can be connected via a bridge circuit of the battery module to the first electrical connection and the second electrical connection, and to a charging path via which the power supply system can be charged, and to a discharging path via which the power supply system can deliver electrical power to a connected consumer. The power supply system has a switching component to which the charging path, the discharging path and the interconnection branch are connected, and wherein the switching component can connect the charging path and/or the discharging path electrically conductively to the interconnection branch.

A battery adapter can be used with an off-brand battery manufacturer to energize a power tool. The battery adapter is configured to monitor the voltage, temperature, and power level of the battery. Monitoring these levels helps prevent the tool from overdischarging the battery, as well as to prevent overheating. The battery adapter has a visible battery power level indicator, actuated by a switch, which visibly displays to a user a general indication of power left in the battery. The battery adapter is able to electrically disconnect the battery if the monitored temperature reaches a certain threshold. The battery adapter is also able to electrically disconnect if the battery adapter and off-brand battery are connected to a recharge station.

An example system includes a first battery; a second battery; a switch coupled to the first battery and the second battery, the switch configured to, based on a control signal, connect or disconnect at least one of the first battery from a load or the second battery from a load; and a current sensor to generate the control signal, the current sensor including a first sensor input terminal and a second sensor input terminal; and an amplifier configured to operate as an amplifier to determine an amount of current between the first sensor input terminal and the second sensor input terminal; and operate as a comparator to determine a direction of the current between the first sensor input terminal and the second sensor input terminal, the control signal corresponding to at least one of the amount of current or the direction of the current.

The present disclosure provides a marine starter battery management system and a method for monitoring its low-temperature charging and discharging. The system comprises a battery management unit, a heating circuit, a high-current charge/discharge drive circuit, a passive balancing circuit, a voltage spike suppression circuit, a soft-start circuit, and a processing unit. The processing unit is electrically connected to these components. Based on battery state parameters, the processing unit controls in real-time the operating states and sequences of the heating circuit, the high-current drive circuit, the passive balancing circuit, the voltage spike suppression circuit, and the soft-start circuit. This intelligent, coordinated control of the various functional modules improves the safety, reliability, and performance of the marine starter battery, particularly in demanding low-temperature environments.

A battery control device includes: a first battery control unit configured to control an electrical connection between an external load and a first battery module, the first battery control unit including: a first switch connected between a positive terminal for the first battery module and the external load; a second switch connected between a negative terminal for the first battery module and the external load; and a first controller configured to control an open/closed state of the first and second switches. The first controller may be configured to detect a short-circuit between the external load and the first battery control unit, according to a voltage between both ends of the first switch detected with the first switch open and the second switch closed.

An electrical isolation system for a high voltage battery circuit in an electrified vehicle, the electrical isolation system mounted to a chassis of the electrified vehicle and comprising: an overcurrent protection switch that is configured to be responsive to leakage current present in the high voltage battery circuit by breaking the high voltage battery circuit and a redundant overcurrent protection circuit that is configured to be responsive to leakage current present in the high voltage battery circuit in a manner that is different from the overcurrent protection switch to break the high voltage battery circuit such that the redundant overcurrent protection circuit is more responsive in one or more fault modes of the electrified vehicle than is the overcurrent protection switch alone, wherein the system is included in a control unit of the electric vehicle

An apparatus for controlling a main line switch mounted on an energy storage system is provided. The energy storage system includes a plurality of battery racks and a disconnect switch unit. The apparatus includes: a battery connection unit respectively on each of the battery racks, the battery connection unit being configured to measure a current of a corresponding one of the battery racks by using a built-in current measurement unit and to generate an overcurrent detection signal when the current of the corresponding one of the battery racks exceeds an overcurrent protection level; and a switch controller configured to open the disconnect switch unit to block a main line current flowing to the energy storage system in response to the overcurrent detection signal from a reference number or more of battery connection units.

A power supply circuit for providing a positive, intermediate, and negative voltage supply includes positive and negative DC voltage buses that connect to a power source; a first voltage divider that is connected between the positive and the negative DC voltage buses, that includes a first transistor connected to the negative DC voltage bus, and that provides the intermediate voltage supply; a second voltage divider that is connected between the positive and the negative DC voltage buses and that is connected to the first transistor; and a short circuit protection module that includes a second transistor connected between outputs of the first and second voltage dividers and connected to the first transistor and that includes a current limiting element connected to the first transistor and configured to limit power dissipated by the first transistor in the case of a short circuit to the intermediate voltage supply.