A method for operating an electrical energy storage device for a motor vehicle, which energy storage device includes an energy storage unit, which has an energy storage unit voltage during normal operation, and which, during a charging process, is charged by electrical energy provided at a charging connection point at a charging voltage that is lower than the energy storage unit voltage. Based on the energy storage unit voltage and the charging voltage, the energy storage unit is divided into a plurality of energy storage subunits, at least one of which has an energy storage subunit voltage that corresponds to the charging voltage and is electrically connected to the charging connection point for the at least partial charging of the energy storage unit.

A battery equalization method includes: obtaining a voltage value of a to-be-equalized cell in a battery pack; obtaining a reference voltage value required for equalization; determining a target equalization duration of the to-be-equalized cell according to a voltage value of the to-be-equalized cell, the reference voltage value, and a preset equalization duty cycle, where the equalization duty cycle is a ratio of an equalization period in a unit cycle to the unit cycle, and the unit cycle includes the equalization period and a sampling period; and controlling equalization of the to-be-equalized cell in the equalization period in the unit cycle according to the target equalization duration. According to this method, sampling is separated from equalization in a unit cycle, thereby ensuring accuracy of collected battery information, making the calculated equalization duration relatively accurate, and improving equalization effects of the battery pack.

A battery-powered aerial vehicle has a central controller, one or more propelling modules, and one or more battery assemblies for powering at least the one or more propelling modules. The battery assemblies are at a distance away from the central controller for reducing electromagnetic interference to the central controller. In some embodiments, the aerial vehicle is an unmanned aerial vehicle (UAV) having a center unit, a plurality of rotor units circumferentially uniformly distributed about and coupled to the center unit, and one or more battery assemblies. The central controller is in the center unit and the propelling modules are in respective rotor units. Each battery assembly is in a rotor unit in proximity with the propelling module thereof. In some embodiments, the central controller also has a battery-power balancing circuit for balancing the power consumption rates of the one or more battery assemblies.

A chargeable device and a charging method are proposed. The chargeable device includes a charging interface and a first charging circuit coupled to the charging interface. The first charging circuit receives voltage and current outputted by an adapter through the charging interface and to apply the voltage and current outputted by the adapter onto two terminals of multiple cells coupled in series built in the chargeable device to charge the multiple cells directly.

A method and system for charging multi-cell lithium-based batteries. In some aspects, a battery charger includes a housing, at least one terminal to electrically connect to a battery pack supported by the housing, and a controller operable to provide a charging current to the battery pack through the at least one terminal. The battery pack includes a plurality of lithium-based battery cells, with each battery cell of the plurality of battery cells having an individual state of charge. The controller is operable to control the charging current being supplied to the battery pack at least in part based on the individual state of charge of at least one battery cell.

A motor vehicle multi-voltage battery device includes a first output current terminal and a ground terminal providing a first rated voltage; a second output current terminal and the ground terminal providing a second rated voltage; a first battery cell group, electrically connected to the first output current terminal and to the ground terminal; a second battery cell group, electrically connected to the second output current terminal and to the first output current terminal and switchably connected in series with the first battery cell group; a charging current terminal connecting the multi-voltage battery device to an external current source; a first DC voltage converter electrically connected on the input voltage side to the charging current terminal and on the output voltage side to the first positive pole, and configured to convert an input voltage at the charging current terminal to a first charging voltage for charging the first battery cell group.

The present disclosure relates to methods and associated systems for operating a battery exchange station. The present method includes (1) receiving a ratio associated with a plurality of vehicles served by the battery exchange station; and (2) based on the ratio, storing different sets of information in memories associated with the batteries respectively, in accordance with received ratio.

The claimed system relates to electrical equipment and comprises a module that includes a module docking unit (16), a remote control device (1), electrical connectors (2, 3) for connection to sources of alternating current (AC) and direct current (DC), and electrical connectors (4, 5) for connection to an AC load and to a DC load. The electrical connector (2) for connection to an AC source is connected, via a unit (6) for switching a supply of electrical energy from an AC source, to the electrical connectors (4) for connection to an AC load and to an AC/DC converter (7), and the electrical connector (3) for connection to a DC source is connected, via a unit (8) for selecting a maximum output from solar panels and a unit (9) for determining a drop in voltage from the DC source, which are connected in series, and by a storage battery charging unit (10), to a first DC converter (11) which steps up and stabilizes the voltage. The storage battery charging unit (10) is connected, via a battery management system unit (12), to a storage battery unit (13) connected to the first DC converter (11), the latter being connected to the electrical connectors (4) for connection to an AC load via an inverter (14) having the function of switching off the supply of DC electrical energy thereto, and to the electrical connectors (5) for connection to a DC load via a second DC converter (15) which steps down the voltage. The invention allows more stable and reliable functioning of the power supply system and could be used as independent power supply system with combination of photovoltaic panels.

In one aspect, a device includes system components and a battery pack. The battery pack includes one or more cell balancing resistors, plural battery cells in a circuit with the one or more cell balancing resistors, at least one processor, and storage accessible to the processor. The storage includes instructions executable by the processor to determine whether a threshold amount of time has accrued during which the device has not been operated on battery power and, responsive to a determination that the threshold amount of time has accrued, employ the one or more cell balancing resistors of the battery pack to reduce the charge level of the plural battery cells.

A battery pack includes a battery including at least one battery cell, a cell balancing device configured to balance a voltage of the at least one battery cell, a switch unit including a charging switch and a discharging switch arranged on a high current path through which a charging current and a discharging current flow, and a battery management unit configured to monitor a voltage and a current of the battery, to control the cell balancing device, and to control charging and discharging operations of the battery, wherein when a state of the battery during charging with a constant current satisfies a preset swelling condition, the battery management unit is configured to operate the cell balancing device for a preset discharging time to make the battery self-discharge, when the present discharging time passes, the battery management unit is configured to pause the battery from self-discharging for a preset pausing time, and when the preset pausing time passes, the battery management unit is configured to charge the battery.