A method of operating a battery charging circuit for charging a battery is described. The method includes controlling the battery charging circuit to operate in a first mode to output a direct current (DC) current at a first voltage less than or equal to a predefined threshold and controlling the battery charging circuit to operate in a second mode to output the DC current at a second voltage greater than the predefined threshold. In the first mode, the AC-to-DC converter is controlled to regulate a DC link voltage across a DC link capacitor and the DC-to-DC converter is configured to output the DC current at the first voltage. In the second mode, the AC-to-DC converter is controlled to output the DC current and the DC-to-DC converter is bypassed to equalize the DC link voltage with the second voltage.

A control device of a charging system is configured to execute acquiring a first index value indicating a deterioration degree of a low-voltage battery of the charging system, acquiring a second index value indicating a degree of whether or not a state in which the low-voltage battery is placed is a state in which the state is likely to deteriorate, and setting a specified range that is a range of input and output power to the low-voltage battery based on the first index value and the second index value.

A portable power charger is provided. The portable power charger includes a port configured to connect to a cable configured to connect to a battery and a safety circuit. The safety circuit is configured to: a) determine that the port is connected to the battery via the cable; b) determine that one or more battery factors of the battery meet one or more corresponding battery thresholds; and c) determine that one or more power charger factors of the portable power charger meet one or more corresponding power charger thresholds. The portable power charger also includes a charging circuit configured to determine a current state of the battery and provide an associated charge to the battery based on the current state.

A device includes an AC impedance circuit to apply an AC excitation signal to a set of battery cells of a battery pack. The device includes a controller to determine a battery pack identification (ID) value from a battery pack identification (ID) circuit of the battery pack, calculate an impedance value of the battery pack based on the AC excitation signal, identify a maximum charging rate to charge the battery pack using the battery pack ID value of the battery pack and the impedance value of the battery pack, where the battery pack is one of at least two battery packs having a same battery pack ID value with different maximum charging rates, and set a charging rate to charge the battery pack using the maximum charging rate.

A processor of a control device of a vehicle performs control to set a first switch to an on state such that power generated by a solar photovoltaic power generation device is supplied to a high-voltage battery while the vehicle is in a ready-to-travel state; in response to a transition from the ready-to-travel state to a parked state, derives a predicted idle time indicating a predicted value of a time for which the vehicle is left idle; determines whether the predicted idle time is longer than a specific time including a polarization elimination time for eliminating polarization of the high-voltage battery; and when it is determined that the predicted idle time is longer than the specific time, performs control to set the first switch to an off state and a second switch to an on state such that the power is supplied to the low-voltage battery.

A method is provided comprising: detecting a connection between an electronic device and a battery charger; transmitting to the battery charger a first request for at least one of a first voltage level and a first current level; receiving from the battery charger a signal; and charging a battery of the electronic device with the signal.

A battery pack powered robotic device that includes a housing, a plurality of wheels connected to the housing, a battery pack receiving interface on the housing and configured to receive at least one battery pack for powering the robotic device, a wireless communications module, and a controller. The wireless communications module is configured to receive a control signal from an external device. The wireless communications module is detachably connected to the housing of the robotic device. The controller is configured to receive the control signal from the wireless communications module, determine whether to power on or power off the robotic device based on the control signal, and power on the robotic device in response to the control signal.

Disclosed are systems and methods to provide continuous power to electrical devices using a portable power supply unit and a portable power charging unit. The portable power supply unit may include a first battery providing a first DC output, at least one first inverter for converting said first DC output to a first AC output for powering the electrical devices and for converting a first AC input to a first DC input for charging said first battery The portable power charging unit may include a second battery for providing a second DC output, a second inverter for converting said second DC output to a second AC output; and transmitting the second AC output to the first battery using charging ports on respective units such that said second AC output replaces said first AC output for powering said electrical devices, and replaces said first AC input for charging said first battery.

Systems and methods for collocated gasoline pumps and electric vehicle charging stations for ultra-high speed charging may include a fuel station having fuel pumps, electric vehicle supply equipment, and a charge buffer. The charge buffer may receive electric current from an electricity supply grid and supply current to the electric vehicle supply equipment. The electric vehicle supply equipment may charge batteries at a rate greater than 4 C, 5.6 C, or 10 C. The electric vehicle supply equipment may be configured to charge batteries with silicon-dominant anodes including active material of 50% or more silicon. The charge buffer may be located in an underground former fuel tank. The electric vehicle supply equipment may supply greater than 120 kW. The charge buffer may include an array of capacitors and/or an array of batteries. The electric vehicle supply equipment may be configured to apply a voltage to batteries above their battery voltage limit when charging.

A device and method for charging a battery pack may include one or more charger terminals configured to connect to corresponding one or more battery pack terminals of a battery pack. The device may include a sensor configured to measure a movement of the charger. The device may include a controller electrically coupled to the sensor and configured to: receive, from the sensor, a movement parameter of the battery pack charger, determine a derating value based on the movement parameter, and modify an amount of current provided to the battery pack over the one or more terminals based on the derating value.