A battery system includes a battery receiving device and a plurality of battery units. Each battery unit can be coupled bidirectionally and inductively to one another and/or to the receiving device for charging/discharging. The receiving device can be connected to an external electrical energy source and/or sink. Each battery unit includes a coil unit. The receiving device has a storage seat for each battery unit removable with a magnetically complementary connectable coil unit for inserting/removing a battery unit without tools. The coil unit has a single coil which is substantially shaped as an elliptical, elongated flat coil, arranged in a half-shell housing and embedded in a ferrite core half-shell of ferrite elements, with a coil unit ratio of thickness to length/width of at least 1:5. The coil unit of the battery unit and receiving device are formed mechanically separable with a maximum distance between the coil units of 110 mm.

A method for diagnosing at least one fuel cell stack of a fuel cell device by way of a fuel cell diagnostic system includes: impressing a sinusoidal first and at least one sinusoidal second AC current into the fuel cell stack; recording a sinusoidal first and second voltage response of the fuel cell stack; evaluating the first voltage response and evaluating the second voltage response by way of an analytical algorithm for a differential impedance analysis; determining a first resistance, a second resistance and a capacitance of the fuel cell stack by specifying an equivalent circuit diagram for the fuel cell stack; and diagnosing the fuel cell stack on the basis of the determined first resistance, the determined second resistance and the determined capacitance, wherein the diagnosis is carried out in real time. A computer-readable storage medium and a fuel cell diagnostic system are also described.

A fuel cell system comprises a controller configured to determine whether a condition relating to a stop pattern of the fuel cell system satisfies a predetermined condition, and an output unit configured to output a warning when it is determined that the condition relating to the stop pattern satisfies the predetermined condition.

Example embodiments of systems, devices, and methods are provided herein for energy systems having multiple modules arranged in cascaded fashion for storing power from one or more photovoltaic sources. Each module includes an energy source and converter circuitry that selectively couples the energy source to other modules in the system over an AC interface for generating AC power or for receiving and storing power from a charge source. Each module also includes a DC interface for receiving power from one or more photovoltaic sources. Each module can be controlled by control system to route power from the photovoltaic source to that modules energy source or to the AC interface. The energy systems can be arranged in single phase or multiphase topologies with multiple serial or interconnected arrays. The energy systems can be arranged such that each module receives power from the same single photovoltaic source, or multiple photovoltaic sources.

Described herein is a fuel cell and battery hybrid system (1) comprising one or more sets (2) of serially connected fuel cells (FC1-n). The one or more sets (2) of serially connected fuel cells (FC1-n) are further serially connected via a respective fuel cell series enhancer (3). The serially connected sets (2) are further connected in parallel with a battery (4) via a fuel cell power charge controller (5). Each respective set (2) of serially connected fuel cells (FC1-n) is further arranged be controlled by the fuel cell series enhancer (3) to operate electrically independent from other sets (2) of serially connected fuel cells (FC1-n) and at its own unique maximum power point or uniquely selected other operating point, regardless of the operating points of other sets (2) of serially connected fuel cells (FC1-n).

A power supply includes fuel cell, secondary battery, power converter, current detecting unit and control unit. The power converter couples the fuel cell with the secondary battery, and is adapted to convert current outputted by the fuel cell into output current. The current detecting unit couples the power converter with the secondary battery and adapted to detect charging current of the output current transferred to the secondary battery. The control unit couples the current detecting unit with the power converter and is adapted to: when the charging current is greater than a charging current upper-limit-setting value of the secondary battery, a down-adjustment signal is outputted to the power converter to reduce the output current; and when the charging current is less than the charging current upper-limit-setting value, an up-adjustment signal is outputted to the power converter to increase the output current.

System, methods, and other embodiments described herein relate to safely activating a fuel cell (FC) within a generator. In one embodiment, a method includes initiating a test for sensitive systems of a generator using backup power including a battery. The method also includes powering an FC and a direct current (DC) converter within the generator to an operational level using the battery, wherein the DC converter stabilizes a circuit fed by the FC. The method also includes, upon successfully completing the test and powering the FC and the DC converter, energizing a load inverter after completing a non-critical sequence that controls support systems of the generator, wherein the DC converter stabilizes energy between the FC, the battery, and the load inverter.

A power supply system including a stack of fuel cells, a device for regulating the voltage at the poles of the stack which includes a resistive load connected between the poles of the stack for generating a voltage drop between them and a controlled switch inserted in series with the resistive load, which can be actuated between an open configuration and a closed configuration.

An electrical energy supply system for mobile platforms includes an electrical arrangement having at least two fuel cell units in a serial interconnection in relation to one another in the electrical arrangement and configured to provide an electrical voltage to supply at least one consumer. The electrical energy supply system includes a ground unit which is assigned an electrical reference potential, and at least two control units, which are each assigned to at least one of the fuel cell units, wherein each of the at least two control units is configured to detect an electrical voltage of the assigned fuel cell unit in relation to the reference potential. An aircraft is disclosed having an electrical energy supply system.

Methods, systems, and apparatus for an energy or fuel sharing network system. The energy or fuel sharing network system includes an in-house fuel cell apparatus that is coupled or included within a home. The in-house fuel cell apparatus includes a generation and distribution unit. The generation and distribution unit is configured to generate energy or fuel and provide the energy or fuel to a vehicle. The energy or fuel sharing network system includes an energy or fuel sharing platform. The energy or fuel sharing platform includes a processor. The processor is configured to determine a location of the in-house fuel cell apparatus, and provide the location of the in-house fuel cell apparatus to the vehicle or a user device.