A supply device for the electrical supply of at least one consumer has a primary current system in which there is a fuel cell device, a secondary current system in which there is a battery which has an operating voltage range limited at the top by a maximum voltage and at the bottom by a minimum voltage and which has an operating current strength range for supplying current to the at least one consumer, and a frost-starting element, which is provided in the primary current system and is designed to bring about heating of the fuel cell device. An open-circuit voltage of the fuel cell device corresponds at most to the maximum voltage of the battery.

A supply device for the electrical supply of at least one consumer has a primary current system in which there is a fuel cell device, a secondary current system in which there is a battery which has an operating voltage range limited at the top by a maximum voltage and at the bottom by a minimum voltage and which has an operating current strength range for supplying current to the at least one consumer, and a frost-starting element, which is provided in the primary current system and is designed to bring about heating of the fuel cell device. An open-circuit voltage of the fuel cell device corresponds at most to the maximum voltage of the battery.

A fuel cell system includes a fuel cell stack, an oxidizing gas supply system, a cooling medium circulation pump, a stack temperature acquisition unit, and a control unit. After a first time point when a change in an acquisition temperature turns from downward to upward after the change in the acquisition temperature turns from upward to downward for the first time after the start of the warm-up operation processing, the control unit sets a decrease speed in cases of decreasing a rotational speed of the cooling medium circulation pump to a smaller value than a value set before the first time point.

A fuel cell system includes an air pump configured to supply air to a fuel cell, and a discharge flow rate determination unit which determines a discharge flow rate of the air pump when warming up the fuel cell, in accordance with a speed of a vehicle in which the fuel cell and the air pump are installed, or a required drive output of the vehicle. The discharge flow rate determination unit increases the discharge flow rate in the case that the speed or the required drive output is greater than or equal to a predetermined threshold value, and decreases the discharge flow rate in the case that the speed or the required drive output is less than the predetermined threshold value.

A fuel cell system includes an air pump configured to supply air to a fuel cell, and a discharge flow rate determination unit which determines a discharge flow rate of the air pump when warming up the fuel cell, in accordance with a speed of a vehicle in which the fuel cell and the air pump are installed, or a required drive output of the vehicle. The discharge flow rate determination unit increases the discharge flow rate in the case that the speed or the required drive output is greater than or equal to a predetermined threshold value, and decreases the discharge flow rate in the case that the speed or the required drive output is less than the predetermined threshold value.

A control method includes acquiring the operation stop request of the fuel cell system, acquiring a next vehicle operation start timing, and calculating a first energy cost and a second energy cost at a predetermined timing after acquiring the operation stop request and the next vehicle operation start timing. The first energy cost is an energy cost required from the predetermined timing to completion of warming up of the fuel cell when a warm-up control is executed using the heater in accordance with the next vehicle operation start timing after the stop control is executed. The second energy cost is an energy cost required when an operation of the fuel cell is continued so as to maintain a temperature of the fuel cell at a warm-up temperature from the predetermined timing to the next vehicle operation start timing. The control method includes continuing the operation of the fuel cell such that the temperature of the fuel cell is maintained at the warm-up temperature while the first energy cost is larger than the second energy cost after the operation stop request is acquired.

A control method includes acquiring the operation stop request of the fuel cell system, acquiring a next vehicle operation start timing, and calculating a first energy cost and a second energy cost at a predetermined timing after acquiring the operation stop request and the next vehicle operation start timing. The first energy cost is an energy cost required from the predetermined timing to completion of warming up of the fuel cell when a warm-up control is executed using the heater in accordance with the next vehicle operation start timing after the stop control is executed. The second energy cost is an energy cost required when an operation of the fuel cell is continued so as to maintain a temperature of the fuel cell at a warm-up temperature from the predetermined timing to the next vehicle operation start timing. The control method includes continuing the operation of the fuel cell such that the temperature of the fuel cell is maintained at the warm-up temperature while the first energy cost is larger than the second energy cost after the operation stop request is acquired.

A battery and a load device are connected to a fuel cell stack. Electric power is supplied from the battery to fuel cell auxiliary equipment. A controller of a fuel cell system has stored therein a desired output of the fuel cell stack. The controller predicts auxiliary equipment power consumption, which is the amount of electric power that is consumed by the fuel cell auxiliary equipment for operation of the fuel cell stack, and determines estimated input and output power of the battery. The controller determines a requested output, which is an output requested for the fuel cell stack, based on the predicted auxiliary equipment power consumption and the estimated input and output power. The controller determines an operating point of the fuel cell stack based on the desired output. The load device controls its operation so that the difference between the requested output and the desired output becomes zero.

A battery and a load device are connected to a fuel cell stack. Electric power is supplied from the battery to fuel cell auxiliary equipment. A controller of a fuel cell system has stored therein a desired output of the fuel cell stack. The controller predicts auxiliary equipment power consumption, which is the amount of electric power that is consumed by the fuel cell auxiliary equipment for operation of the fuel cell stack, and determines estimated input and output power of the battery. The controller determines a requested output, which is an output requested for the fuel cell stack, based on the predicted auxiliary equipment power consumption and the estimated input and output power. The controller determines an operating point of the fuel cell stack based on the desired output. The load device controls its operation so that the difference between the requested output and the desired output becomes zero.

A method and a system for heat preservation of a battery of a vehicle, and a storage medium is provided. The method includes: detecting, in response to completing the charging of the vehicle, whether a current temperature of the battery of the vehicle is lower than a preset temperature threshold value of the battery, and the temperature threshold value is configured as a lowest temperature value at which the battery is able to maintain normal performance; and controlling, when a detection result is yes, the vehicle to obtain an electrical energy from an external charging device to heat the battery, such that the battery is heated above the temperature threshold value to complete heat preservation of the battery. The method provided by the present application can heat the battery without consuming the power of the battery used for endurance mileage of the vehicle when the battery is charged.