Embodiments of the present disclosure provide an active equalizer circuit, a battery management system, a power supply system and an electrical equipment. The active equalizer circuit comprises a plurality of switching transistors, a driving transformer, a multi-port converter, a buck converter, and a microcontroller. Each of the switching transistors is coupled to a battery cell in the series battery pack on a one-to-one basis. The multi-port converter comprises an equalizing transformer and a bridge converter, each secondary winding of the bridge converter is coupled to a corresponding plurality of battery cells. The buck converter has an input terminal coupled to an output terminal of the series battery pack and an output terminal coupled to an input terminal of the bridge converter. The microcontroller is configured to output a first control signal to the buck converter, to make the buck converter transform an output voltage of the series battery pack and output the transformed output voltage to the bridge converter, and output a second control signal to the bridge converter, to control an operation state of the bridge converter. According to the embodiments of the present disclosure, the cost and volume of the active equalizer circuit can be reduced.

A switching unit is provided for each of a plurality of batteries arranged in series, and switches between a connected state where the corresponding battery is connected in series with another battery and a non-connected state where series connection between the corresponding battery and the other battery is disconnected. A control unit controls the switching unit corresponding to the battery to switch to the non-connected state when it is determined that the corresponding battery reaches a charge end voltage during charging or a discharge end voltage during discharging, and determinates deterioration of the batteries. Further, the control unit changes the charge end voltage or the discharge end voltage for each of the plurality of batteries in accordance with a deterioration state of the plurality of batteries.

A charge-discharge control circuit includes a first cell balancing circuit having a first switch; a second cell balancing circuit having a second switch; a first cell balance detection circuit having a third switch; a second cell balance detection circuit having a fourth switch; and a control circuit which outputs a control signal to turn on the first switch in a prescribed cycle according to the voltage of a first battery which is higher than or equal to a cell balance detection voltage, or outputs a control signal to turn on the second switch in the prescribed cycle according to the voltage of a second battery which is higher than or equal to the cell balance detection voltage, and outputs a control signal to turn off the third switch and the fourth switch in the prescribed cycle during output of the control signal.

A battery pack includes a housing having a positive terminal and a negative terminal. Battery cells are located within the housing and are selectively coupled to the positive terminal and coupled to the negative terminal. A battery management system is located within the housing and is configured to operate a first switch within the housing to selectively couple the battery cells and the positive terminal. A bleed circuit is electrically coupled between the positive terminal and the negative terminal. The bleed circuit includes a resistor and a second switch to selectively couple the positive terminal to the negative terminal. The battery management system is configured to open the first switch and close the second switch and measure a voltage drop across the resistor to detect a presence and type of voltage source connected to the positive terminal.

This power supply circuit for work machine is provided with a first switch for switching connection and disconnection of a first electrical path provided between a battery and a load which is driven with the power of the battery, and a second switch for switching connection and disconnection of a second electrical path bypassing the first switch. The second switch, when the first switch is switched from a state in which the first electrical path is connected to a state in which the first electrical path is disconnected, places the second electrical path in a connected state for a certain period and then, after the period elapses, switches the state in which the second electrical path is connected to a state in which the second electrical path is disconnected.

An energy storage system can comprise a stack of multiple battery modules, a plurality of ultrasound emitter transducers, a plurality of ultrasound receiving transducers, one or more excitation modules, one or more capture modules, and an ultrasound battery management system. Each ultrasound emitter transducer and each ultrasound receiving transducer can be acoustically coupled to a surface of a respective one of the battery modules. The excitation module(s) can be electrically interfaced with the plurality of ultrasound emitter transducers, and the capture module(s) can be electrically interface with the plurality of ultrasound receiving transducers. The ultrasound battery management system controller can be configured to initiate battery module ultrasound interrogation sequences.

A portable hybrid power module is provided. The power module represents a combined capacitor and battery residing together in a single housing. The battery is preferably a 12 volt DC gel cell battery while the capacitor is an ultra-capacitor residing in parallel with the battery. The ultra-capacitor may be a series of 6 to 12 super capacitors residing in series, with each super capacitor providing 2.5 volts DC charge. The hybrid power module is configured to provide a charge to start an external portable device. The device may be an all-terrain vehicle, a personal water craft, a generator set, or a vehicle. The power module includes a first device terminal and a second device terminal for establishing electrical communication with a battery of the external portable device.

A wireless battery management system includes a plurality of slave BMSs coupled to a plurality of battery modules in one-to-one correspondence. Each slave BMS is configured to operate in active mode and sleep mode. Each slave BMS is configured to wirelessly transmit a detection signal indicating a state of the battery module. The wireless battery management system further includes a master BMS configured to wirelessly receive the detection signal from each of the plurality of slave BMSs. The master BMS is configured to set a scan cycle and a scan duration for each of the plurality of slave BMSs based on the detection signal, and wirelessly transmit a control signal to the plurality of slave BMSs. The control signal includes a wireless balancing command indicating the scan cycle and the scan duration set for each of the plurality of slave BMSs.

A power supply system includes a first power circuit coupled to a capacity-type first battery and a drive motor, a second power circuit coupled to an output-type second battery, a voltage converter that converts a voltage between the first power circuit and the second power circuit, and a converter ECU and a management ECU that operate the voltage converter to control converter passing power in the voltage converter. The management ECU sets, when a first SOC that is a percentage of charge in the first battery is less than a predetermined lamp-on threshold and a first maximum output P1_lim that is a maximum output of the first battery is more them a predetermined output threshold Pe0 maximum converter passing power Pcnv_max corresponding to maximum power with respect to the converter passing power to 0 to prohibit discharging of the second battery.

A battery system includes: a battery and a battery management system (BMS) for controlling charging of the battery depending on a normal mode using a first battery capacity between a first lower limit state of charge (SOC) and a first upper limit SOC or an eco-friendly mode using a second battery capacity between a second lower limit SOC and a second upper limit SOC, the first lower limit SOC is smaller than the second lower limit SOC, and the first upper limit SOC is greater than the second upper limit SOC.