ClassID:

213510

H01M8/04649 - CPC Classification

Classification description:

Fuel cells; Manufacture thereof; Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids; Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function; Electric variables; Other electric variables, e.g. resistance or impedance of fuel cell stacks

Recent Application in this class:
#1
20260106187
2026-04-16

COOLANT DRAIN SYSTEM OF ION FILTER

#2
20260100389
2026-04-09

FUEL CELL VEHICLE AND METHOD OF CONTROLLING THE SAME

#3
20250385284
2025-12-18

FUEL CELL DURABILITY AND VALIDATION MODULE TEST STAND

#4
20250253367
2025-08-07

Methods, Devices, Controllers, and Media for Determining Fuel Cell Anode Water Condition

#5
20250246650
2025-07-31

SYSTEM AND METHOD FOR MAXIMIZING THE OPERATING TIME OF FUEL CELL STACKS

#6
20250237689
2025-07-24

SYSTEM AND METHOD FOR DETERMINING WHETHER TO REPLACE ION FILTER

#7
20250192205
2025-06-12

PROCESSING METHOD AND PROCESSING APPARATUS RELATED TO ELECTROCHEMICAL CELL, AND NON-TRANSITORY STORAGE MEDIUM

#8
20250183336
2025-06-05

METHOD FOR MONITORING A BATTERY POWER PLANT

#9
20250125384
2025-04-17

STRUCTURE FOR INCREASING DURABILITY OF ION FILTER

#10
20250015322
2025-01-09

FUEL CELL DETERIORATION DETERMINATION DEVICE AND FUEL CELL VEHICLE

#11
20240243312
2024-07-18

Fuel Cell System and Control Method and Device Thereof

#12
20240234759
2024-07-11

METHOD FOR CONTROLLING A DRYING PROCESS OF A FUEL CELL SYSTEM

#13
20240178414
2024-05-30

FUEL CELL SYSTEM

#14
20230420711
2023-12-28

FUEL CELL SYSTEM

#15
20230207846
2023-06-29

System and method for indirectly monitoring an isolation resistance of one or more fuel cells

#16
20230152382
2023-05-18

Apparatus for measuring impedance of fuel cell for vehicle and method thereof

#17
20230084323
2023-03-16

Method for controlling fuel cell device

#18
20230015110
2023-01-19

Method for Diagnosing at Least One Fuel Cell Stack of a Fuel Cell Device, Computer-Readable Storage Medium, and Fuel Cell Diagnostic System

#19
20220402363
2022-12-22

CONTROL METHOD AND SYSTEM OF A FUEL CELL ELECTRIC VEHICLE STACK

#20
20220367892
2022-11-17

SOEC system and method for operating a SOEC system

#21
20220359893
2022-11-10

FUEL CELL STACK MODULE FAULT DETECTION SYSTEM AND METHOD

#22
20220344686
2022-10-27

FUEL CELL STACK INSULATION MONITORING SYSTEM

#23
20220336830
2022-10-20

Water removing system and method of fuel cell vehicle using impedance

#24
20220246962
2022-08-04

Electrochemical impedance spectroscopy (“EIS”) analyzer and method of using thereof

#25
20220223889
2022-07-14

INFORMATION PROCESSING DEVICE, INFORMATION PROCESSING SYSTEM, AND PROGRAM

#26
20220166040
2022-05-26

Fuel cell vehicle and method of stopping the same

#27
20220149400
2022-05-12

Device and method for online impedance spectrum measurement of vehicle-mounted hydrogen fuel cell

#28
20220131165
2022-04-28

Aircraft electrical power supply system and method of supplying electrical power in an aircraft

#29
20220089045
2022-03-24

Battery condition determination

#30
20220077479
2022-03-10

VOLTAGE CONVERTER ARRANGEMENT, FUEL CELL SYSTEM AND METHOD OF OPERATING A VOLTAGE CONVERTER ARRANGEMENT

#31
20210404078
2021-12-30

IMPEDANCE MONITORING OF A MODULAR ELECTROLYSIS SYSTEM

#32
20210296667
2021-09-23

Method of stopping operation of fuel cell system

#33
20210265644
2021-08-26

Method and apparatus for subzero start-up of fuel cell

#34
20210184236
2021-06-17

Method for measuring impedance of fuel cell stack in vehicle

#35
20210184235
2021-06-17

Method for calculating voltage loss of fuel cell and system performing the same

#36
20200358114
2020-11-12

Water removing system and method of fuel cell vehicle using impedance

#37
20200212509
2020-07-02

Battery condition determination

#38
20200194813
2020-06-18

Electrochemical impedance spectroscopy (“EIS”) analyzer and method of using thereof

#39
20200185741
2020-06-11

Fuel cell systems and methods for detecting fuel contaminants and hydrocarbon content

#40
20200168928
2020-05-28

Method for operating a fuel cell system and a fuel cell vehicle

#41
20200153008
2020-05-14

Fuel cell state determination method and fuel cell state determination apparatus

#42
20200075977
2020-03-05

System and method for maintaining insulation resistance of fuel cell

#43
20200006792
2020-01-02

Fuel cell system and method for inferring wet state of fuel cell

#44
20190312291
2019-10-10

Apparatus and method for controlling operation of fuel cell system

#45
20190237784
2019-08-01

Anode bleed control in a fuel cell stack

#46
20190214664
2019-07-11

Cell reversal diagnostics for a fuel cell stack

#47
20190207233
2019-07-04

Below freezing start-up method for fuel cell system

#48
20190173113
2019-06-06

Fuel cell system and fuel cell system control method

#49
20190173108
2019-06-06

Power supply device, apparatus, and control method

#50
20190148750
2019-05-16

Method for calculating voltage loss of fuel cell and system performing the same

#51
20190143839
2019-05-16

Control apparatus for vehicle plant

#52
20190067718
2019-02-28

Fuel cell system and method of identifying power leakage area

#53
20190051917
2019-02-14

Control device for fuel cell system

#54
20190049522
2019-02-14

Method for determining critical operating states in a fuel cell stack

#55
20190049521
2019-02-14

Method for determining critical operating states in a fuel cell stack

#56
20190036137
2019-01-31

HEALTH MONITORING OF AN ELECTROCHEMICAL CELL STACK

#57
20190013233
2019-01-10

System reference with compensation of electrical and mechanical stress and life-time drift effects

#58
20180212262
2018-07-26

Apparatus and method for determining the condition of an electricity-producing cell

#59
20180145350
2018-05-24

Power conditioning system and control method therefor

#60
20180126865
2018-05-10

Technique of diagnosing fuel cell stack

#61
20180123152
2018-05-03

Power conditioning system and control method therefor

#62
20180108925
2018-04-19

Apparatus and method for diagnosing state of fuel cell stack

#63
20180083298
2018-03-22

Output performance diagnosis apparatus for fuel cell, output performance diagnosis system for fuel cell, output performance diagnosis method for fuel cell, and non-transitory computer readable medium storing output performance diagnosis program for fuel cell

#64
20180026280
2018-01-25

Fuel cell system with cathode purging

#65
20170356951
2017-12-14

System and method for measuring insulation resistance of fuel cell vehicle

#66
20170346106
2017-11-30

Device intended to generate electricity from a planar fuel cell cooled by air flow

#67
20170324106
2017-11-09

Fuel cell stack health monitoring using groups of fuel cells

#68
20170324104
2017-11-09

State determination device and method for fuel cell

#69
20170307692
2017-10-26

State estimation device and method for fuel cell and fuel cell system

#70
20170297451
2017-10-19

Method and system for controlling air flow supplied to vehicle fuel cell

#71
20170294667
2017-10-12

Method of determining hydrogen deficiency and device for determining hydrogen deficiency

#72
20170263960
2017-09-14

Fuel cell system and control method of the same

#73
20170250415
2017-08-31

Method for controlling fuel cell system

#74
20170244336
2017-08-24

Power supply system, apparatus, and control method combining a first control signal and a second control signal

#75
20170170500
2017-06-15

Method and system for diagnosing state of fuel cell stack

#76
20170104230
2017-04-13

Laminated battery, separator and connection method of internal resistance measuring device

#77
20170089984
2017-03-30

DIAGNOSIS DEVICE AND DIAGNOSIS METHOD

#78
20170077535
2017-03-16

Electrochemical impedance spectroscopy (“EIS”) analyzer and method of using thereof

#79
20170062878
2017-03-02

Battery condition determination

#80
20170059663
2017-03-02

Diagnostic device

#81
20170045588
2017-02-16

Impedance measuring device and control method for impedance measuring device

#82
20170040626
2017-02-09

Use of neural network and EIS signal analysis to quantify H2 crossover in-situ in operating PEM cells

#83
20170025693
2017-01-26

Systems and methods for detecting anode contamination in a fuel cell system

#84
20160380289
2016-12-29

Fuel cell system including water content estimation

#85
20160351928
2016-12-01

Fuel cell system and control method for fuel cell system

#86
20160347200
2016-12-01

Fuel Cell Vehicle

#87
20160240875
2016-08-18

Anode bleed control in a fuel cell stack

#88
20160238647
2016-08-18

System reference with compensation of electrical and mechanical stress and life-time drift effects

#89
20160169979
2016-06-16

Apparatus and method for measuring impedance for fuel cell diagnosis

#90
20160156046
2016-06-02

Fuel cell system and control method of fuel cell system

#91
20160141690
2016-05-19

Fuel cell system and control method thereof

#92
20160126566
2016-05-05

Fuel cell system

#93
20160061902
2016-03-03

Apparatus for diagnosing a state of a fuel cell stack and method thereof

#94
20160028095
2016-01-28

Impedance measuring device and control method for impedance measuring device

#95
20160006061
2016-01-07

Power converter for fuel cell and method for controlling the same

#96
20160006060
2016-01-07

Method of controlling operation of fuel cell system

#97
20160006059
2016-01-07

DRIVING CONTROL METHOD AND SYSTEM OF FUEL CELL SYSTEM

#98
20150362560
2015-12-17

System and method for diagnosing state of fuel cell stack and controlling fuel cell system

#99
20150352974
2015-12-10

Fuel-cell vehicle

#100
20150349358
2015-12-03

Fuel cell system and control method for the same

#101
20150276888
2015-10-01

Impedance measuring device for laminated battery

#102
20150244011
2015-08-27

Electrochemical impedance spectroscopy (EIS) analyzer and method of using thereof

#103
20150228990
2015-08-13

Structure and method for fuel cell system where multiple fuel cells and power electronics feed loads in parallel allowing for integrated electrochemical impedance spectroscopy (EIS)

#104
20150180348
2015-06-25

Method for generating injection current for fuel cell stack and apparatus for performing the same

#105
20150153418
2015-06-04

Method for determining critical operating states in a fuel cell stack

#106
20150084638
2015-03-26

Current measurement device

#107
20150064589
2015-03-05

Fuel cell system and its control method

#108
20150024295
2015-01-22

Humidity control method including AC impedance measurement for fuel cell and a fuel cell system

#109
20150004506
2015-01-01

Fuel cell system

#110
20140363751
2014-12-11

Health monitoring of an electrochemical cell stack

#111
20140220470
2014-08-07

Fuel cell system for calculating fuel cell temperature based on water content and internal impedance thereof, and method for controlling the same

#112
20140205923
2014-07-24

Power generation characteristic estimation device for fuel cell

#113
20140199605
2014-07-17

Transient inlet relative humidity estimation via adaptive cathode humidification unit model and high frequency resistance

#114
20140176144
2014-06-26

Method for diagnosing fault of fuel cell stack

#115
20140176143
2014-06-26

Method for generating injected current of fuel cell stack

#116
20140176142
2014-06-26

Method for diagnosing fault of fuel cell stack

#117
20140159738
2014-06-12

Method and apparatus for diagnosing fault within fuel cell stack

#118
20140089055
2014-03-27

Optimizing contractual management of the total output of a fleet of fuel cells

#119
20140026633
2014-01-30

Extremum seeking algorithm in a variable time interval to detect anode pressure sensor stuck failure in a fuel cell system

#120
20130288147
2013-10-31

Method and regulation apparatus for regulating a fuel cell or a fuel cell stack

#121
20130249562
2013-09-26

Internal resistance measurement device and method for stacked battery

#122
20130157158
2013-06-20

Fuel cell system

#123
20130065091
2013-03-14

Fuel cell system, and control method for fuel cell system

#124
20130059215
2013-03-07

Methods and systems for controlling power output of a fuel cell

#125
20130057292
2013-03-07

Fuel cell system

#126
20120270124
2012-10-25

FUEL CELL SYSTEM AND OPERATING METHOD FOR FUEL CELL SYSTEM

#127
20120196199
2012-08-02

FUEL CELL SYSTEM AND METHOD FOR CONTROLLING THE SAME

#128
20120183873
2012-07-19

Fuel cell system

#129
20120155505
2012-06-21

Freezing detection method for fuel cell

#130
20120107706
2012-05-03

Fuel cell system and control method at starting in the fuel cell system

#131
20120105220
2012-05-03

Method and apparatus for monitoring a vehicular propulsion system battery

#132
20120088167
2012-04-12

Operating method for a fuel cell system

#133
20120038373
2012-02-16

Apparatus for estimating fuel-cell hydrogen concentration and fuel cell system

#134
20110300461
2011-12-08

Fuel cell system with constantly accurate impedance measurement

#135
20110294026
2011-12-01

Method and apparatus for controlling the operation of a fuel cell

#136
20110221450
2011-09-15

Measurement process for determination of the optimum contact pressure among components of a solid oxide fuel cell stack in the packaging process and its measurement apparatus

#137
20110077839
2011-03-31

System and method to operate a fuel cell in the exhaust of an internal combustion engine

#138
20110014547
2011-01-20

Method for storing a fuel cell at freezing temperature

#139
20100323260
2010-12-23

Fuel cell system for impedance measurement and scavenging processing

#140
20100291446
2010-11-18

Fuel cell system

#141
20100286939
2010-11-11

METHOD AND APPARATUS FOR DIAGNOSING DETERIORATION OF FUEL CELL

#142
20100279186
2010-11-04

Fuel battery system

#143
20100264930
2010-10-21

Fuel cell system

#144
20100261082
2010-10-14

Fuel cell system

#145
20100244850
2010-09-30

Electric vehicle with ground fault detecting system

#146
20100239930
2010-09-23

Fuel cell system and method of controlling the same

#147
20100233560
2010-09-16

FUEL CELL SYSTEM

#148
20100227242
2010-09-09

Fuel cell system, and operation method for fuel cell

#149
20100209791
2010-08-19

FUEL CELL SYSTEM

#150
20100203409
2010-08-12

Fuel cell system and its control method

#151
20100190073
2010-07-29

Bleed trigger monitor used in fuel cell system

#152
20100141262
2010-06-10

Performance degradation analyzer and method of the same

#153
20100141212
2010-06-10

Stimulation and intensification of interfacial processes

#154
20100119898
2010-05-13

FUEL CELL SYSTEM

#155
20100112401
2010-05-06

Fuel cell system, electrode catalyst degradation judgment method, and moving body

#156
20100112398
2010-05-06

Fuel cell system

#157
20100098979
2010-04-22

Fuel cell system and moving body using the fuel cell system

#158
20100092817
2010-04-15

Method for revising a polarization curve that defines the current/voltage relationship of a fuel cell stack

#159
20100081022
2010-04-01

Fuel cell system

#160
20100068575
2010-03-18

Fuel cell system with an oxidation gas flow controller

#161
20100068574
2010-03-18

Fuel cell system and power supply control method

#162
20100055508
2010-03-04

FUEL CELL SYSTEMS WITH WATER RECOVERY FROM FUEL CELL EFFLUENT

#163
20100047644
2010-02-25

Fuel cell system with a scavenging device and AC impedance measuring unit

#164
20100040931
2010-02-18

INTEGRATION OF ELECTRONICS AND ELECTRICAL DISTRIBUTION INSIDE A FUEL CELL STACK

#165
20100035107
2010-02-11

Fuel cell system

#166
20100028729
2010-02-04

FUEL CELL POWER PLANT INCLUDING A VARIABLE RESISTIVE DEVICE

#167
20100015482
2010-01-21

Fuel cell system

#168
20100013490
2010-01-21

Controller in a fuel cell system that controls the measurement of AC impedance and drives the DC/DC converter

#169
20100009225
2010-01-14

Fuel cell system and mobile body

#170
20090305099
2009-12-10

Startup reliability using HFR measurement

#171
20090274935
2009-11-05

Fuel Cell System Designed to Ensure Stability of Operation

#172
20090269625
2009-10-29

Methods and systems for determining and controlling fuel concentrations in fuel cells

#173
20090226769
2009-09-10

MEASUREMENT OF INSULATION RESISTANCE OF FUEL CELL IN FUEL CELL SYSTEM

#174
20090213896
2009-08-27

Freezing detection method for fuel cell

#175
20090208786
2009-08-20

FUEL CELL SYSTEM

#176
20090202877
2009-08-13

Concentration distribution estimation device for impurity in anode side, and fuel cell system using the device

#177
20090197126
2009-08-06

Adaptive gain scheduled control for current limitation based on voltage performance of a fuel cell system

#178
20090191432
2009-07-30

Fuel cell system cathode inlet relative humidity control

#179
20090186247
2009-07-23

Fuel cell power supply

#180
20090169934
2009-07-02

Fuel cell system

#181
20090117427
2009-05-07

Fuel cell system having a control unit for measuring impedance

#182
20090110985
2009-04-30

Fuel cell system which measures impedance

#183
20090096464
2009-04-16

Electrical leakage detecting device for a fuel cell system

#184
20090081489
2009-03-26

On-line system identification and control of fuel cell humidification via HFR measurements

#185
20090075127
2009-03-19

METHOD FOR MEASURING HIGH-FREQUENCY RESISTANCE OF FUEL CELL IN A VEHICLE

#186
20090011302
2009-01-08

Fuel Cell System

#187
20090004514
2009-01-01

Method of selecting non-humidification operation condition of proton exchange membrane fuel cell

#188
20080299423
2008-12-04

FUEL CELL SYSTEMS WITH MAINTENANCE HYDRATION

#189
20080226954
2008-09-18

Hydrogen generating apparatus, fuel cell power generation system, method of controlling hydrogen generating quantity and recorded medium recorded program performing the same

#190
20080213635
2008-09-04

System and method of purging fuel cell stacks

#191
20080193810
2008-08-14

Hydrogen generating apparatus and fuel cell power generation system

#192
20080166609
2008-07-10

Fuel cell system

#193
20080152987
2008-06-26

Fuel cell system and vehicle with fuel cell system mounted thereon

#194
20080145714
2008-06-19

Fuel Cell System and Related Method

#195
20080118797
2008-05-22

Fuel cell system

#196
20080081238
2008-04-03

Water transfer efficiency improvement in a membrane humidifier by reducing dry air inlet temperature

#197
20080076012
2008-03-27

Method for adaptive prediction of stack voltage in automotive fuel cell systems

#198
20080070073
2008-03-20

FUEL CELL MODULE POWER DELIVERY CONTROL SYSTEM

#199
20080042654
2008-02-21

Fuel cell diagnostic apparatus and diagnostic method

#200
20070259256
2007-11-08

Systems and methods for detecting and indicating fault conditions in electrochemical cells

#201
20070190377
2007-08-16

System and method to operate a fuel cell in the exhaust of an internal combustion engine

#202
20070184314
2007-08-09

Fuel cell system

#203
20070172708
2007-07-26

Fuel cell system failure diagnosis method, failure diagnosis device using same, and fuel cell system

#204
20070099040
2007-05-03

Fuel cell system, method of starting fuel cell system

#205
20070072016
2007-03-29

METHODS AND APPARATUS FOR IMPROVING THE COLD STARTING CAPABILITY OF A FUEL CELL

#206
20060172159
2006-08-03

Method for regeneration of performance in a fuel cell

#207
20060154119
2006-07-13

Method for regeneration of performance in a fuel cell

#208
20060121322
2006-06-08

Systems and methods for fuel cell shutdown

#209
20060110639
2006-05-25

Fuel cell with a regulated output

#210
20060078788
2006-04-13

Method for monitoring the operational state of a fuel cell stack

#211
20060074574
2006-04-06

Technique and apparatus to measure a fuel cell parameter

#212
20060003198
2006-01-05

Apparatus and method for measuring the insulation resistance of a fuel cell system

#213
20050287402
2005-12-29

AC impedance monitoring of fuel cell stack

#214
20050153181
2005-07-14

Fuel cell system with a control unit

#215
20050126642
2005-06-16

Gas regulation system and process for operating the gas regulation system

#216
20050092617
2005-05-05

Automatic measurement of fuel cell resistance

#217
20050037247
2005-02-17

Fuel cell system and method for removal of water from fuel cells

#218
18987143
2025-09-23

Prediction method of electrochemical and mechanical performances in SOFC cold and hot cycle