An off grid electric system for charging electric vehicles. An electric storage system (BTS) is arranged to store electric power generated by a plurality of wind turbines. A plurality of electric vehicle charging stations are connected to the plurality of wind turbines, and the electric storage system by means of an off grid electric power network (CN), so as to allow each charging station to charge at least one electric vehicle (EV).

A moving object includes: a first battery module and a second battery module, each of which includes a plurality of battery cells laminated in a first direction; a battery case configured to house the first and the second battery modules; a charger configured to charge the first and the second battery modules; a load; and a battery controller configured to control the first and the second battery modules. The first and the second battery modules are arranged in the first direction. The first and the second battery modules are electrically connected in parallel to the charger and the load. When one of the first and the second battery modules is being charged, the battery controller prohibits charge of the other of the first and the second battery modules.

A vehicle charging apparatus is described herein, which may include a battery pack comprising a plurality of individual batteries, a power input port receiving electrical power at a first wattage, an AC-to-DC conversion circuit configured to provide DC power to charge groups of batteries in the plurality of individual batteries, a power conversion circuit configured to condition a DC output of at least one group of batteries to provide a charging current output to a vehicle via a coupling, and a processing circuit configured to control the power conversion circuit to provide the charging current at a second wattage greater than the first wattage. The first wattage may be actively or inherently limited to a level less than the second wattage in order to provide fast DC charging with a limited power input.

Described is a new partial power converter (PPC) for the DC-DC stage of rapid-charging stations for electric vehicles (EV). The proposed converter manages only a fraction of the total power delivered from the grid to the battery, which increases the general efficiency of the system and the power density while potentially reducing the cost of the charger. The proposed topology is based on a switched capacitor between the AC terminals of a bridge converter H and does not require high-frequency isolation transformers in order to provide a source of controllable voltage between the CC link and the battery. The proposed concept can be implemented by using interposed power cells, which can improve energy quality, reduce the size of the inductor, and allow scalability for chargers of higher nominal power.

Various disclosed embodiments include illustrative controller units, direct current fast charging (DCFC) units, and methods. In an illustrative embodiment, a controller unit includes a controller and a memory configured to store computer-executable instructions. The computer-executable instructions are configured to cause the controller to determine status of a power electronics module (PEM) of a direct current fast charging (DCFC) unit, and instruct the PEM to control power quality of a three-phase alternating current (AC) grid power signal in response to the determined status being available.

Embodiments of the present application provide a charging/discharging apparatus, a method for charging a battery and a charging/discharging system, the charging-and-discharging apparatus including a bidirectional AC/DC converter, a first DC/DC converter, and a control unit, where the first DC/DC converter is a bidirectional DC/DC converter; and where the control unit is configured to: receive a first charging current sent by a BMS of a battery, control the bidirectional AC/DC converter and the first DC/DC converter according to the first charging current to charge the battery through an AC power; receive a first discharging current sent by the BMS and discharging a power of the battery according to the first discharging current; and receiving a second charging current sent by the BMS and control the bidirectional AC/DC converter and the first DC/DC converter according to the second charging current to charge the battery through the AC power.

A charging device disclosed herein includes an input port, an output port, and a relay circuit. The input port is electrically connected to an external power source provided externally and that is configured to be able to input direct-current power and alternating-current power from the external power source. The output port is electrically connected to an electrified vehicle and that outputs direct-current power to the electrified vehicle. The relay circuit relays electric power between the input port and the output port. The relay circuit includes a converter circuit that converts alternating-current power into direct-current power when the alternating-current power is input to the input port, and an input bypass circuit that causes direct-current power to bypass the converter circuit when the direct-current power is input to the input port.

A system and method of a multi-channel, multi-mode electric vehicle (EV) AC to DC charger has power channels, each power channel contains an AC/DC converter and corresponding DC/DC regulator. Each channel is configured to supply DC power to a channel-connected EV. The charger also has a controllable bridging switch, connected in parallel between the power channels and disposed before or after the DC/DC regulators, and provides an intermediary path between the power channels. It also contains controllable series switches, after the DC/DC regulators to provide a break in a power channel output path. A controller controls the AC/DC converters, DC/DC regulators, bridging and series switches. The charger is multi-mode capable, enabling (a) charging an EV, (b) directing power from one channel's connected end device to another channel's connected end device, (c) injecting real or reactive power back to an AC power source, (d) active AC filtering, and (d) phase balancing.

An intermediate circuit is equipped with a first terminal connection, which includes a neutral conductor connection, and with a first and a second intermediate circuit capacitor and a diode circuit. The intermediate circuit has configuration switches which in a first state connect the intermediate circuit capacitors to one another in series and in a second state connect the intermediate circuit capacitors to one another in parallel. The configuration switches are each designed as changeover switches, which bypass the diode circuit in the first state, wherein the neutral conductor connection is connected to the diode circuit. A vehicle-based charging circuit, which includes the intermediate circuit and a rectifier circuit, is also described.

Powerflow of a rechargeable energy storage system (RESS) is managed according to a method. The RESS has series-connected first and second battery elements with different characteristics. Each element, e.g., a pack, has a corresponding maximum or minimum voltage or current limit. Currents are predicted for each of the first and second battery elements via a controller using a corresponding voltage limit. A requested operating mode of the RESS is used to select a current for the elements. A voltage across the elements is predicted using the selected current and a corresponding battery state space model. The method predicts a total power capability of the RESS over a prediction horizon using the selected current to generate predicted power capability values. The requested operating mode is controlled over the horizon using the power capability values. A powertrain system includes the RESS, an inverter, an electric machine, and the controller.