A system for maintaining insulation resistance of a fuel cell includes a fuel cell stack, a coolant line that allows coolant to pass through the fuel cell stack, a circulation pump that circulates the coolant in the coolant line, a deionizer that removes impurities or ions from the coolant in the coolant line, and a controller configured to measure the insulation resistance of a high-voltage terminal connected to the fuel cell stack, to determine whether recovery control is necessary based on the measured insulation resistance, and upon determining that recovery control is necessary, to control the circulation pump so as to change the flow of the coolant passing through the deionizer.

A fuel cell vehicle according to the present disclosure includes, in a front room: a fuel cell stack fixed to an upper part of a stack frame; a high voltage element fixed to an upper part of the fuel cell stack; and an ion exchanger that is arranged in front of the fuel cell stack and the high voltage element. The stack frame is provided with an inclined part, and when the ion exchanger is displaced rearward at the time of a frontal crash of the fuel cell vehicle, a rear part in a lower end of the ion exchanger is slid along an inclined surface of the inclined part and the ion exchanger is displaced in a diagonally upward direction, whereby the cap part of the ion exchanger is positioned on the upper side in the vertical direction with respect to the high voltage element.

An FC (fuel cell) system includes: an FC; a radiator configured to cool a CL (cooling liquid); an ion exchanger provided in a BFP (bypass flow path) branched off from a CFP (circulation flow path) for allowing the CL to circulate between the FC and the radiator; a multi-way valve provided in a branching point at which the BFP is branched off from the CFP; and a pump which circulates the CL. A percentage of the CL that is made to flow through the BFP can be controlled by the multi-way valve. In a case in which a stop time is longer than a threshold time when the FC system is started up, after the CL is circulated through the radiator, the CL is circulated through the BFP at the percentage of 80% or more until electrical conductivity of the CL becomes smaller than a threshold electrical conductivity.

A fuel cell system including a radiator disposed on an electronic part cooling line, the cooling line configured to pass through an electronic part and to circulate a coolant, the radiator being configured to cool the coolant, a coolant pump configured to pump the coolant to circulate the coolant in electronic part cooling line, and a controller configured to determine whether air bubbles are generated, based on a change in a current of the coolant pump while the coolant is circulating and control an air bleeding through the coolant pump.

A fuel cell system FCS includes a fuel cell 10, a high voltage circuit 21 for driving an electromotor 42, and a relay 41 for electrically connecting or blocking the fuel cell 10 to or from the high voltage circuit 21. A control unit 50 obtains insulation decrease information in accordance with a request for starting the fuel cell, and performs, when a specified insulation decrease occurred region is not a fuel cell region SE1 including the fuel cell and the cooling circuit, conductivity reduction process on cooling liquid using a conductivity reduction unit 113 before having a relay 41 connect, and has the relay 41 connect after completing the conductivity reduction process.

A method for cooling a fuel cell (3) using a liquid cooling medium, wherein of the starting materials supplied to the fuel cell and the products discharged from the fuel cell, at least one is gaseous during at least one of the operating conditions. The cooling medium is conveyed through the fuel cell (3) by a coolant conveying device (11). The power consumption of the coolant conveying device (11) is compared to predefined reference values in order to detect gas in the liquid cooling medium by a deviation of the power consumption from the predefined reference values.

An ion exchanger filter device comprises a housing comprising a central tube extending in an axial direction, and at least two receiving compartments respectively enclosing at least two ion exchanger cartridges, the at least two receiving compartments being arranged circumferentially and in fluid connection with the central tube, each of the at least two ion exchanger cartridges comprising a cartridge container with a circumferentially extending wall enclosing a receptacle filled with an ion exchanger material, and the circumferentially extending wall comprising one or more outflow ports distributed at or about a circumference of the circumferentially extending wall. The ion exchanger filter further comprises a connector comprising at least one inflow opening and at least one outflow opening for a medium, the connector being in fluid connection to a central opening of the housing. The medium flows through the at least two ion exchanger cartridges in parallel.