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.

The present invention discloses a method and system for charging rechargeable battery cells in series. When the voltage of a specific battery cell is too high, discharge the specific battery cell, and at the same time let other battery cells with lower voltage continue to charge, so that each battery cell in series can be charged to almost the same level. This invention designs in a “Total voltage follow-up charging method”, a Battery Manage System (BMS) detects total voltage of the series-connected battery in real-time and modifies an “equalizing trigger voltage”, as the total voltage drifts the equaling function still works well.

A downhole power system includes an energy storage adapted to operate at high temperatures, and a modular signal interface device that serves to control the energy storage component as well as offer a means of data logging at high temperatures. The controller is fabricated from pre-assembled components that may be selected for various combinations to provide desired functionality. The energy storage may include at least one ultracapacitor.

This document describes techniques and systems that enable battery state estimation. The techniques and systems may be used to determine a shut-down voltage for a battery of an electronic device. Additionally or alternatively, the techniques and systems may be used to determine a state-of-charge of the battery, which may be determined relative to the shut-down voltage. The techniques and systems use current or expected conditions at the battery to estimate the battery state. These techniques can allow the electronic device to dynamically set a shut-down voltage, rather than using a fixed shut-down voltage over the life of the electronic device. The dynamically set shut-down voltage can provide a low margin, and therefore a greater portion of battery capacity, when operating in good conditions and provide a relatively large margin that is sufficient for poor conditions.

A vehicle includes an electrified propulsion system powered by a traction battery over an electrical distribution system (EDS) and a controller programmed to monitor at least one of a current flow and a temperature at a plurality of locations throughout the EDS. The controller is also programmed to implement at least one mitigation action over a predetermined time window in response to detecting a filtered current value exceeding a threshold.

An energy storage device and a method thereof are provided. The power transfer circuit transfers a DC voltage provided by a battery module into an AC output voltage to provide the AC output voltage to an output end of the power transfer circuit for providing power to a load. When the AC output voltage is at a default phase, the power transfer circuit is disabled in a default period, and whether the energy storage device may be shut down is determined according to a voltage difference of the AC output voltage sensed by a sensing circuit during the default period.

A battery control system and method selectively connect battery strings to one or more conductive buses by plural electrically controllable switches. The switches are controlled to one or more of (a) connect the strings with one or more of the load or the power source via the one or more conductive buses in a first sequence and/or (b) disconnect the strings from one or more of the load or the power source via the one or more conductive buses in a second sequence. The first sequence and the second sequence are based on one or more of states of charge between the strings, different charge capacities between the strings, different electric currents conducted through the strings, different polarities of the electric currents conducted through the strings, and/or a speed of a vehicle that is powered by the one or more loads.

A battery pack is provided that can better manage peak current of in a converged portable radio. The battery pack comprises an internal Li-Ion cell stack characterized by a linear output voltage curve. A DC-DC converter converts the internal cell stack voltage to a desired DC-DC converter output voltage. The output voltage and current sourcing capability of the battery pack remain constant over the full cell discharge curve. The battery pack optimizes cell utilization, without the use of any internal microprocessor, thereby supporting the operation of simultaneous high peak current application features associated with LMR and LTE.

A vehicle battery diagnosis method and system are provided. A controller completes charging a battery by stopping supply of current from a charger to the battery. The controller measures a relaxation voltage corresponding to a decrement of a voltage of the battery during a predetermined time period directly after the charging of the battery is completed. The controller estimates the state of health (SoH) of the battery in accordance with the relaxation voltage.

Provided is a switched capacitor-based electrical stimulation device which supplies a direct current (DC) power, detects a charging voltage charged in any one of a plurality of capacitors, controls the DC power supplied to a capacitor module to repeat a charging level and a resting level according to a charging pattern when the charging voltage is lower than a target voltage, and outputs an electric current to electrodes which contact a human body based on an output pattern.