An elevator automatic rescue and energy-saving control method, the method comprising: when the power grid supplies power normally, selecting a single current in a three-phase power grid (9) as an AC power supply for an elevator control system (10); controlling a DC-DC converter (2) to charge the super capacitor module (1) connected to the DC-DC converter to a specified standby electric energy level; and when the power grid is suddenly interrupted, selecting to use the electric energy stored in the super capacitor module (1) as a rescue electric energy for a traction motor (7) and the elevator control system (10). The described method uses a super capacitor module, so that a stable and reliable elevator rescue power supply is provided when the power grid is suddenly interrupted, and the regenerative electric energy dissipated during elevator braking operation is stored and utilized during elevator operation, thereby conserving energy.

In a sampling circuit, a single cell in a series battery pack is isolated from a voltage divider resistor in a bleeder circuit by using a first isolation sampling switch, so as to prevent a drain current of the single cell. In addition, sampling errors in sampling voltages collected by the sampling circuit may be offset during differential calculation.

An apparatus for jump starting a vehicle having a battery and an alternator is disclosed. The apparatus comprises a rechargeable power supply, an isolator electrically connected to said rechargeable power supply and configured for transitioning between a closed position to establish a low impedance electrical path between the rechargeable power supply and the alternator, via the vehicle battery, and an open position to close the electrical connection between the rechargeable power supply and the alternator, a cell voltage sensing and balancing circuit electrically connected to said a rechargeable power supply, and a controller electrically connected to said rechargeable power supply via said cell voltage sensing and balancing circuit, and electrically connected to said isolator, wherein the controller comprises a processor for processing digital data and a memory device coupled to the processor and configured for storing digital data including computer program code, wherein the processor is controlled by the computer program code to: (i) monitor a cell voltage in said rechargeable power supply via the cell voltage sensing and balancing circuit, and if the cell voltage is less than a first predetermined threshold voltage, cause the isolator to transition to the closed position to charge said rechargeable power supply from the alternator, if the cell voltage is greater than the first predetermined threshold voltage, cause the isolator to transition to the open position to close the electrical connection between said rechargeable power supply and the alternator; and (ii) when said rechargeable power supply has sufficient charge, cause the isolator to transition to the closed position to allow an electrical current to flow from said rechargeable power supply to the vehicle battery to jump start the vehicle via said low impedance electrical path.

A modular multi-level converter including modules each having switching elements and at least one electrical energy storage element, wherein a first number of modules are interconnected to form a closed ring, and at least two taps are arranged between respective adjacent individual modules of the closed ring. Wherein at at least two taps respectively a second number of modules are provided as a phase module branching off from the closed ring and forming a star string comprising at least two modules, the phase module connected to the respective tap on one end and forming a phase terminal at an other end. Wherein the switching elements enable interconnection of energy storage elements of adjacent modules, as a result of which between two adjacent phase terminals a voltage difference is provideable, which is regulatable by a control unit in accordance with a polyphase rotating field profile. Furthermore, the present invention relates to a polyphase system and a method for efficient power exchange between modules.

One or more battery sub-modules are selected by obtaining at least one voltage from each battery sub-module and selecting based at least in part on the obtained voltages. The battery sub-modules are electrically connected in series in order to provide power to a primary load. Each battery sub-module includes a plurality of cells electrically connected in series and each battery sub-module further includes a battery management system that monitors the cells in that battery sub-module. Those battery management systems in the selected sub-modules are turned off so that the battery management systems in the selected sub-modules do not consume power at least temporarily from the cells in the selected sub-modules while (1) the battery sub-modules are not providing power to the primary load and (2) the battery sub-modules are not being charged.

A parameter estimation device configured to estimate a parameter of an equivalent circuit model of a secondary battery includes: a voltage acquisition unit configured to acquire a voltage of the secondary battery in a time-series manner; a current acquisition unit configured to acquire a charge/discharge current of the secondary battery in a time-series manner; an estimation unit configured to estimate the parameter on the basis of the voltage acquired by the voltage acquisition unit and the charge/discharge current acquired by the current acquisition unit; and a prohibition unit configured to prohibit the estimation of the parameter performed by the estimation unit, on the basis of the charge/discharge current acquired by the current acquisition unit or the voltage acquired by the voltage acquisition unit.

A balance charging method and a charging device are provided. The method includes: obtaining a voltage parameter of a plurality of battery cells; determining a control parameter set according to a first value relationship between the voltage parameter and a plurality of first threshold values, wherein the control parameter set includes a plurality of second threshold values; determining a charging rule of balance charging according to a second value relationship between the voltage parameter and the second threshold values; and performing the balance charging on the battery cells according to the charging rule.

A system for charging one or more batteries of a vehicle may include a charging box mounted to a vehicle to facilitate connection to a charge coupler from under the vehicle. The charge coupler may be configured to provide an electrical connection between an electrical power source and the charging box. A vehicle including the charging box may maneuver to a position above the charge coupler, after which electrical contacts of the charging box and the charge coupler may be brought into contact with one another. The charge coupler and/or the charging box may be configured to provide electrical communication between the electrical power source and the one or more batteries, so that the electrical power source may charge one or more of the batteries. Thereafter, the electrical contacts may be separated from one another, and the vehicle may maneuver away from the charge coupler.

A cell supervising circuit includes: a measurement circuit which measures a state of charge of a secondary battery cell; a transformer which is provided for the measurement circuit to contactlessly receive power supply from a power source different from the secondary battery cell; and a communication circuit which transmits, via the transformer to a BMU which manages a status of a battery pack, the state of charge measured by the measurement circuit.

The invention provides a voltage balancing system for balancing controlling of voltage of battery cells including a first set of battery cells and a second set of battery cells connected in series. The system includes a high-side analog front end (AFE) connected to the first set of battery cells, a low-side analog front end (AFE) connected to the second set of battery cells, a microcontroller communicating with the high-side AFE and the low-side AFE, and a communication isolating module interconnecting between the high-side AFE and the microcontroller. The system further includes a balancing module arranged at a back end of the low-side AFE or the high-side AFE to equalize voltages output by the low-side AFE and the high-side AFE. Compared with the prior arts, the system employs a balancing module to balance the voltages of the two sets of battery cells, which can shorten the voltage difference therebetween.