# US 10,770,740 B2 · Method of shutting down operation of fuel cell vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,770,740 B2 - Document ID: US10770740B2 - Status: Granted - Kind: B2 - Application number: 16/032,296 - Filed: 2018-07-11 - Published: 2019-09-19 - Granted: 2020-09-08 - Earliest claimed: 2018-03-14 - Assignees: Hyundai Motor Company; Kia Motors Corporation - Applicants: Hyundai Motor Company; Kia Motors Corporation - Inventors: Dae Jong Kim - Web page: https://patentgrep.com/patent/US10770740B2 ## CPC - B60L 3/0053: {relating to fuel cells} - H01M 8/04955: Shut-off or shut-down of fuel cells - B60L 3/04: Cutting off the power supply under fault conditions (protective devices and circuit arrangements in general H01H; H02H) - B60L 50/70: using power supplied by fuel cells (in combination with batteries B60L50/75) - B60L 58/30: for monitoring or controlling fuel cells - B60L 58/33: by cooling - B60L 58/40: for controlling a combination of batteries and fuel cells - H01M 8/04303: applied during shut-down - H01M 8/04753: {of fuel cell reactants} - H01M 8/0488: {of fuel cell stacks} - H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00) - H02J 7/34: Parallel operation in networks using both storage and other DC sources, e.g. providing buffering (H02J7/14 takes precedence) - B60Y 2200/91: Electric vehicles - H01M 2250/20: Fuel cells in motive systems, e.g. vehicle, ship, plane - Y02E 60/10: Energy storage using batteries - Y02E 60/50: Fuel cells - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 90/40: Application of hydrogen technology to transportation, e.g. using fuel cells - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method of shutting down operation of a fuel cell vehicle includes: blocking, by a controller, an air supply to a fuel cell stack when an operation shutting down command of the fuel cell vehicle is applied; increasing, by the controller, a voltage at an rear end of a stack main relay connected to the fuel cell stack; and opening, by the controller, the stack main relay when the voltage at the rear end of the stack main relay is higher than a stack voltage by a predetermined voltage or more. ## Claims ### Claim 1 A method of shutting down operation of a fuel cell vehicle, the method comprising: an air supply blocking step of blocking, by a controller, an air supply to a fuel cell stack when an operation shutting down command of the fuel cell vehicle is applied; a voltage raising step of increasing, by the controller, a voltage at a rear end of a stack main relay connected to the fuel cell stack such that the voltage at the rear end of the stack main relay is higher than a voltage at the fuel cell stack; and a stack voltage blocking step of opening, by the controller, the stack main relay when the voltage at the rear end of the stack main relay is higher than a stack voltage by a predetermined voltage or more. ### Claim 2 (depends on 1) The method of claim 1, further comprising: before the voltage raising step, a voltage dropping step of dropping the voltage at the rear end of the stack main relay in a predetermined slope when the voltage at the rear end of the stack main relay exceeds a voltage of a high voltage battery; and a charging step of charging the high voltage battery by using a remaining voltage of the fuel cell stack when dropping the voltage at the rear end of the stack main relay. ### Claim 3 (depends on 2) The method of claim 2, further comprising: a voltage dropping stop step of stopping of the dropping the voltage at the rear end of the stack main relay when the voltage at the rear end of the stack main relay reaches a sum of the voltage of the high voltage battery and a first margin voltage, wherein when the stack voltage reaches a voltage in which the voltage at the rear end of the stack main relay and a second margin voltage are added together, the voltage raising step is performed so that the voltage at the rear end of the stack main relay increases. ### Claim 4 (depends on 1) The method of claim 1, further comprising, after the stack voltage blocking step, a remaining voltage consuming step of consuming a remaining voltage of the fuel cell stack by closing a resistor relay connected between the fuel cell stack and a resistor. ### Claim 5 (depends on 4) The method of claim 4, wherein the remaining voltage consuming step includes: closing a first resistor relay connected between the fuel cell stack and the resistor; closing a second resistor relay connected between the fuel cell stack and the resistor when the stack voltage is equal to or less than a first reference voltage; and opening the first resistor relay when the stack voltage is equal to or less than a second reference voltage that is lower than the first reference voltage.