Abstract: A fuel cell system includes a plurality of fuel cell units each including a fuel cell, a fuel cell cooling system having a heat exchanger that exchanges heat between a primary-side coolant, and a secondary-side coolant flowing through the fuel cell, and a coolant pump that adjusts the flow rate of the secondary-side coolant, and a controller that controls the fuel cell, a cooling device, and a cooling system that supplies the primary-side coolant from the cooling device to each fuel cell unit. During stop of operation of the fuel cell system, the cooling device supplies the primary-side coolant having a temperature equal to or higher than a predetermined temperature to each fuel cell unit, and the controller activates the coolant pump to cause the secondary-side coolant to flow through the heat exchanger, in one or more fuel cell units in which the fuel cell has a possibility of freezing.

Abstract: A fuel cell system includes: a plurality of fuel cell units of which each includes a fuel cell, an air supply pipe, an air supply device, an air discharge pipe, and a control unit; and an exhaust pipe connected to the plurality of air discharge pipes and configured to discharge exhaust gas to the outside of the fuel cell system. The control units of the plurality of fuel cell units are configured such that, when one or more fuel cell units included in the plurality of fuel cell units are operating to generate electric power and each of the remainder of the plurality of fuel cell units is not operating to generate electric power, the control unit of the fuel cell unit that is not operating to generate electric power activates the air supply device of the corresponding fuel cell unit.

Abstract: A fuel cell system includes fuel cell units each including a fuel cell stack, an anode gas discharge system configured to discharge anode gas from the fuel cell stack, and a cathode gas supply and discharge system configured to supply cathode gas to the fuel cell stack and discharge cathode gas from the fuel cell stack, a mixed gas discharge system configured to mix gas discharged from the anode gas discharge system and the cathode gas supply and discharge system of each fuel cell unit and discharge the mixed gas, and a controller configured to control the fuel cell units. The controller is configured to control at least one of the anode gas discharge system and the cathode gas supply and discharge system of each fuel cell unit to shift a time at which gas to be discharged from each fuel cell unit merges in the mixed gas discharge system.

Abstract: A fuel cell system includes a plurality of fuel cell units each including a fuel cell, a fuel cell cooling system having a heat exchanger that exchanges heat between a primary-side coolant, and a secondary-side coolant flowing through the fuel cell, and a coolant pump that adjusts the flow rate of the secondary-side coolant, and a controller that controls the fuel cell, a cooling device, and a cooling system that supplies the primary-side coolant from the cooling device to each fuel cell unit. During stop of operation of the fuel cell system, the cooling device supplies the primary-side coolant having a temperature equal to or higher than a predetermined temperature to each fuel cell unit, and the controller activates the coolant pump to cause the secondary-side coolant to flow through the heat exchanger, in one or more fuel cell units in which the fuel cell has a possibility of freezing.

Abstract: A fuel cell system includes fuel cell units each including a fuel cell stack, an anode gas discharge system configured to discharge anode gas from the fuel cell stack, and a cathode gas supply and discharge system configured to supply cathode gas to the fuel cell stack and discharge cathode gas from the fuel cell stack, a mixed gas discharge system configured to mix gas discharged from the anode gas discharge system and the cathode gas supply and discharge system of each fuel cell unit and discharge the mixed gas, and a controller configured to control the fuel cell units. The controller is configured to control at least one of the anode gas discharge system and the cathode gas supply and discharge system of each fuel cell unit to shift a time at which gas to be discharged from each fuel cell unit merges in the mixed gas discharge system.

Abstract: A fuel cell system includes: a plurality of fuel cell units of which each includes a fuel cell, an air supply pipe, an air supply device, an air discharge pipe, and a control unit; and an exhaust pipe connected to the plurality of air discharge pipes and configured to discharge exhaust gas to the outside of the fuel cell system. The control units of the plurality of fuel cell units are configured such that, when one or more fuel cell units included in the plurality of fuel cell units are operating to generate electric power and each of the remainder of the plurality of fuel cell units is not operating to generate electric power, the control unit of the fuel cell unit that is not operating to generate electric power activates the air supply device of the corresponding fuel cell unit.

Abstract: A battery system includes: a battery; a voltage detector that detects a voltage of the battery as a detected voltage value; a current detector that detects a current flowing through the battery as a detected current value; and an electronic control unit. The electronic control unit is configured to estimate an aging deterioration of the battery based on an open circuit voltage value that is calculated from the detected voltage value and an integrated current value that is calculated from the detected current value, and estimate the aging deterioration of the battery based on the open circuit voltage value and the integrated current value that are calculated when a charge level of the battery is in the non-hysteresis region.

Abstract: A battery system includes: a battery; a voltage detector that detects a voltage of the battery as a detected voltage value; a current detector that detects a current flowing through the battery as a detected current value; and an electronic control unit. The electronic control unit is configured to estimate an aging deterioration of the battery based on an open circuit voltage value that is calculated from the detected voltage value and an integrated current value that is calculated from the detected current value, and estimate the aging deterioration of the battery based on the open circuit voltage value and the integrated current value that are calculated when a charge level of the battery is in the non-hysteresis region.