Abstract: The invention proceeds from a method of operating a cell system (22) having at least one electrochemical cell (24). It is proposed that at least one operational parameter of a temperature control unit (30) of the cell system (22) is set depending on at least one internal temperature parameter of the cell system (22).

Abstract: The invention relates to a method for operating a fuel cell system, wherein the fuel cell system is controlled in accordance with a system-specific digital twin (14) that represents the fuel cell system. According to the invention, the digital twin (14) controls the fuel cell system in at least two different active operating states (16, 18) of the fuel cell system.

Abstract: The invention proceeds from a method for determining at least one cell parameter, in particular an aging parameter, of a cell system (30) comprising at least one electrochemical cell (32). It is proposed that the cell parameter be determined based on a physical model of the cell system (30) depending on operational parameters of the cell system (30). (FIG.

Abstract: A method for operating a fuel cell system, in particular a high-temperature fuel cell system. In at least one method step of the method, an oxygen-containing fluid is conveyed through at least one fuel cell unit of the fuel cell system for reaction with a fuel, wherein a flow parameter of the oxygen-containing fluid is adjusted according to a power balance of the fuel cell system. In at least one method step of the method, the power balance at a load change of the fuel cell system is partially replaced by an operating characteristic value of the fuel cell system determined in a stationary state of the fuel cell system.

Abstract: The invention relates to a method for operating a fuel cell system, wherein the fuel cell system is controlled in accordance with a system-specific digital twin (14) that represents the fuel cell system. According to the invention, the digital twin (14) controls the fuel cell system in at least two different active operating states (16, 18) of the fuel cell system.

Abstract: A power electronics unit may include a circuit board and a cooling device. The circuit board may include at least one electronic component which, in a heat transfer region, is disposed flat against an electronics side of the circuit board. The cooling device may include at least one impingement jet chamber through which a cooling fluid is flowable from an inlet to an outlet. The cooling device may further include at least one nozzle plate having at least one flow nozzle. The at least one nozzle plate may be arranged in and divide the at least one impingement jet chamber into an inlet chamber and an outlet chamber, which may be fluidically connected to one another via the at least one flow nozzle. The at least one flow nozzle may accelerate and conduct the cooling fluid towards the heat transfer region of the at least one electronic component.

Abstract: A power electronics unit may include a circuit board and a cooling device. The circuit board may include at least one electronic component which, in a heat transfer region, is disposed flat against an electronics side of the circuit board. The cooling device may include at least one impingement jet chamber through which a cooling fluid is flowable from an inlet to an outlet. The cooling device may further include at least one nozzle plate having at least one flow nozzle. The at least one nozzle plate may be arranged in and divide the at least one impingement jet chamber into an inlet chamber and an outlet chamber, which may be fluidically connected to one another via the at least one flow nozzle. The at least one flow nozzle may accelerate and conduct the cooling fluid towards the heat transfer region of the at least one electronic component.