Photo of Vaclav Knap
  • Pontoppidanstræde 111, 1-163

    9220 Aalborg Ø

    Denmark

20132022
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Research Output 2013 2019

  • 11 Journal article
  • 11 Conference article in Journal
  • 10 Article in proceeding
  • 1 Ph.D. thesis
2019
2 Citations (Scopus)
194 Downloads (Pure)

Electrochemical Impedance Spectroscopy-Based Electric Circuit Modeling of Lithium-Sulfur Batteries During a Discharging State

Stroe, D-I., Knap, V., Swierczynski, M. J. & Schaltz, E., Jan 2019, In : I E E E Transactions on Industry Applications. 55, 1, p. 631-637 7 p., 8428469.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
Electrochemical impedance spectroscopy
Networks (circuits)
Electric vehicles
Lithium
Sulfur
1 Citation (Scopus)

Improved state of charge estimation for lithium-sulfur batteries

Propp, K., Auger, D. J., Fotouhi, A., Marinescu, M., Knap, V. & Longo, S., Dec 2019, In : Journal of Energy Storage. 26, 13 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Extended Kalman filters
Voltage measurement
Networks (circuits)
Electric current measurement
Open circuit voltage
3 Downloads (Pure)

Towards Validation of Battery Mission Lifetime for Nano-satellites: Fast, Cheap and Accurate Through a Representative Mission Profile

Knap, V., Kjelgaard Vestergaard, L. & Stroe, D-I., Sep 2019, Proceedings of 2019 European Space Power Conference (ESPC) . IEEE Press, 5 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Open Access
File
Satellites
Testing
Telemetering
Costs
2018
1 Citation (Scopus)
163 Downloads (Pure)

Accelerated Lifetime Testing of High Power Lithium Titanate Oxide Batteries

Stroe, A-I., Stroe, D-I., Knap, V., Maciej, S. & Teodorescu, R., Sep 2018, Proceedings of the 2018 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE Press, p. 3857-3863 7 p. (IEEE Energy Conversion Congress and Exposition).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Open Access
File
Lithium
Oxides
Testing
Aging of materials
Temperature
5 Citations (Scopus)

Comparison of lithium-ion battery performance at beginning-of-life and end-of-life

Stroe, A-I., Knap, V. & Stroe, D-I., Sep 2018, In : Microelectronics Reliability. 88-90, p. 1251-1255 5 p.

Research output: Contribution to journalConference article in JournalResearchpeer-review

electric batteries
lithium
Aging of materials
Open circuit voltage
ions
1 Citation (Scopus)
142 Downloads (Pure)

Concurrent Real-Time Estimation of State of Health and Maximum Available Power in Lithium-Sulfur Batteries

Knap, V., Auger, D. J., Propp, K., Fotouhi, A. & Stroe, D-I., Aug 2018, In : Energies. 11, 8, p. 1-24 24 p., 2133.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
Battery
Concurrent
Health
Real-time
Extended Kalman filters
119 Downloads (Pure)

Experimental Study on Calendaristic Degradation and Self-Discharge of 3.4 Ah Lithium-Sulfur Pouch Cells

Knap, V. & Stroe, D-I., 2018, In : ECS Transactions. 85, 13, p. 267-273 7 p.

Research output: Contribution to journalConference article in JournalResearchpeer-review

Open Access
File
Lithium
Sulfur
Degradation
Monitoring
Costs
4 Citations (Scopus)
188 Downloads (Pure)

Reference Performance Test Methodology for Degradation Assessment of Lithium-Sulfur Batteries

Knap, V., Stroe, D-I., Purkayastha, R., Walus, S., Auger, D. J., Fotouhi, A. & Propp, K., May 2018, In : Journal of The Electrochemical Society. 165, 9, p. A1601-A1609 9 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
lithium sulfur batteries
performance tests
lithium
methodology
degradation
2 Citations (Scopus)
162 Downloads (Pure)

State-of-Health Estimation of Lithium-Ion Batteries based on Partial Charging Voltage Profiles

Stroe, D-I., Knap, V. & Schaltz, E., 2018, In : ECS Transactions. 85, 13, p. 379-386 8 p.

Research output: Contribution to journalConference article in JournalResearchpeer-review

Open Access
File
Health
Electric potential
Aging of materials
Lithium-ion batteries
2017
338 Downloads (Pure)

Characterization, Modelling and State Estimation of Lithium-Sulfur Batteries

Knap, V., 2017, Aalborg Universitetsforlag. 197 p. (Ph.d.-serien for Det Ingeniør- og Naturvidenskabelige Fakultet, Aalborg Universitet).

Research output: Book/ReportPh.D. thesisResearch

Open Access
File
2 Citations (Scopus)
212 Downloads (Pure)

Electric circuit modeling of lithium-sulfur batteries during discharging state

Stroe, D-I., Knap, V., Swierczynski, M. J. & Schaltz, E., Oct 2017, Proceedings of 2017 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, p. 1024-1029 6 p. (IEEE Energy Conversion Congress and Exposition).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Open Access
File
Networks (circuits)
Electric vehicles
Electrochemical impedance spectroscopy
Lithium
Sulfur
21 Citations (Scopus)
90 Downloads (Pure)

Kalman-variant estimators for state of charge in lithium-sulfur batteries

Propp, K., Auger, D. J., Fotouhi, A., Longo, S. & Knap, V., Mar 2017, In : Journal of Power Sources. 343, p. 254-267 14 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
lithium sulfur batteries
Kalman filters
Lithium
estimators
lithium
4 Citations (Scopus)
148 Downloads (Pure)

Methodology for Assessing the Lithium-Sulfur Battery Degradation for Practical Applications

Knap, V., Stroe, D-I., Purkayastha, R., Walus, S., Auger, D. J., Fotouhi, A. & Propp, K., 2017, In : ECS Transactions. 77, 11, p. 479-490 12 p.

Research output: Contribution to journalConference article in JournalResearchpeer-review

Open Access
File
Degradation
Standardization
Lithium sulfur batteries
Testing
Costs
76 Citations (Scopus)

Operation of Grid -Connected Lithium-Ion Battery Energy Storage System for Primary Frequency Regulation: A Battery Lifetime Perspective

Stroe, D. L., Knap, V., Swierczynski, M. J., Stroe, A-I. & Teodorescu, R., Jan 2017, In : I E E E Transactions on Industry Applications. 53, 1, p. 430 - 438 9 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
Energy storage
Demonstrations
Lithium-ion batteries
5 Citations (Scopus)

Self-balancing feature of Lithium-Sulfur batteries

Knap, V., Stroe, D-I., Christensen, A. E., Propp, K., Fotouhi, A., Auger, D. J., Schaltz, E. & Teodorescu, R., Dec 2017, In : Journal of Power Sources. 372, p. 245-251 7 p.

Research output: Contribution to journalJournal articleResearchpeer-review

lithium sulfur batteries
electric batteries
cells
polysulfides
Polysulfides
1 Citation (Scopus)
282 Downloads (Pure)

Thermal Behavior and Heat Generation Modeling of Lithium Sulfur Batteries

Stroe, D-I., Knap, V., Swierczynski, M. J. & Schaltz, E., 2017, In : ECS Transactions. 77, 11, p. 467-476 10 p.

Research output: Contribution to journalConference article in JournalResearchpeer-review

Open Access
File
Heat generation
Space applications
Temperature
Hot Temperature
Lithium sulfur batteries
1 Citation (Scopus)
157 Downloads (Pure)

Transferring the Incremental Capacity Analysis to Lithium-Sulfur Batteries

Knap, V., Kalogiannis, T., Purkayastha, R., Beczkowski, S., Stroe, D-I., Schaltz, E. & Teodorescu, R., 2017, In : ECS Transactions. 77, 11, p. 1919-1927 9 p.

Research output: Contribution to journalConference article in JournalResearchpeer-review

Open Access
File
Health
Degradation
Aging of materials
Electric potential
Temperature
2016
5 Citations (Scopus)
624 Downloads (Pure)

An Electrochemical Impedance Spectroscopy Study on a Lithium Sulfur Pouch Cell

Stroe, D. L., Knap, V., Swierczynski, M. J., Stanciu, T., Schaltz, E. & Teodorescu, R., Oct 2016, In : ECS Transactions. 72, 12, p. 13-22 10 p.

Research output: Contribution to journalConference article in JournalResearchpeer-review

Open Access
File
Electrochemical impedance spectroscopy
Lithium
Sulfur
Temperature
Networks (circuits)
14 Citations (Scopus)

A self-discharge model of Lithium-Sulfur batteries based on direct shuttle current measurement

Knap, V., Stroe, D. L., Swierczynski, M. J., Purkayastha, R., Propp, K., Teodorescu, R. & Schaltz, E., Dec 2016, In : Journal of Power Sources. 336, p. 325-331 7 p.

Research output: Contribution to journalJournal articleResearchpeer-review

lithium sulfur batteries
Electric current measurement
Polysulfides
electric batteries
Parameterization
278 Downloads (Pure)

Design, Build and Validation of a Low-Cost Programmable Battery Cycler

Propp, K., Fotouhi, A., Knap, V. & Auger, D. J., Dec 2016, In : ECS Transactions. 74, 1, p. 101-111 11 p.

Research output: Contribution to journalConference article in JournalResearchpeer-review

Open Access
File
Hardware
Costs
Availability
Electric current measurement
Life cycle
39 Citations (Scopus)
632 Downloads (Pure)

Investigation of the Self-Discharge Behavior of Lithium-Sulfur Batteries

Knap, V., Stroe, D. L., Swierczynski, M. J., Teodorescu, R. & Schaltz, E., Mar 2016, In : Journal of The Electrochemical Society. 163, 6, p. A911-A916 6 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
lithium sulfur batteries
Lithium
Sulfur
Polysulfides
Open circuit voltage
22 Citations (Scopus)
96 Downloads (Pure)

Multi-temperature state-dependent equivalent circuit discharge model for lithium-sulfur batteries

Propp, K., Marinescu, M., Auger, D. J., O'Neill, L., Fotouhi, A., Somasundaram, K., Offer, G. J., Minton, G., Longo, S., Wild, M. & Knap, V., Oct 2016, In : Journal of Power Sources. 328, p. 289-299 11 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
lithium sulfur batteries
equivalent circuits
Equivalent circuits
Lithium
Sulfur
4 Citations (Scopus)
159 Downloads (Pure)

Significance of the Capacity Recovery Effect in Pouch Lithium-Sulfur Battery Cells

Knap, V., Zhang, T., Stroe, D. L., Schaltz, E., Teodorescu, R. & Propp, K., Dec 2016, In : ECS Transactions. 74, 1, p. 95-100 6 p.

Research output: Contribution to journalConference article in JournalResearchpeer-review

Open Access
File
Energy storage
Recovery
Lithium
Sulfur
Temperature
76 Citations (Scopus)
1854 Downloads (Pure)

Sizing of an Energy Storage System for Grid Inertial Response and Primary Frequency Reserve

Knap, V., Chaudhary, S. K., Stroe, D. L., Swierczynski, M. J., Craciun, B-I. & Teodorescu, R., Sep 2016, In : I E E E Transactions on Power Systems. 31, 5, p. 3447-3456 10 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
Energy storage
Wind power
Power plants
LSI circuits
Frequency response
1 Citation (Scopus)
232 Downloads (Pure)

Two-dimensional Thermal Modeling of Lithium-ion Battery Cell Based on Electrothermal Impedance Spectroscopy

Swierczynski, M. J., Stroe, D. L., Knap, V., Kær, S. K. & Teodorescu, R., May 2016, In : ECS Transactions. 72, 11, p. 33-38 6 p.

Research output: Contribution to journalConference article in JournalResearchpeer-review

Open Access
File
Spectroscopy
Temperature distribution
Lithium-ion batteries
Hot Temperature
Networks (circuits)
2015
4 Citations (Scopus)
535 Downloads (Pure)

Comparison of Parametrization Techniques for an Electrical Circuit Model of Lithium-Sulfur Batteries

Knap, V., Stroe, D. L., Teodorescu, R., Swierczynski, M. J. & Stanciu, T., Jul 2015, Proceedings of the 2015 IEEE 13th International Conference on Industrial Informatics (INDIN). Cambridge, United Kingdom: IEEE Press, p. 1278-1283 6 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

File
Networks (circuits)
Polysulfides
Energy storage
Chemical reactions
Lithium
12 Citations (Scopus)
849 Downloads (Pure)

Electrical circuit models for performance modeling of Lithium-Sulfur batteries

Knap, V., Stroe, D. I., Teodorescu, R., Swierczynski, M. J. & Stanciu, T., Sep 2015, Proceedings of the 2015 IEEE Energy Conversion Congress and Exposition (ECCE). Montreal, QC, Canada: IEEE Press, p. 1375-1381 6 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

File
Networks (circuits)
Lithium
Sulfur
Topology
Energy storage
6 Citations (Scopus)
551 Downloads (Pure)

Evaluation of different methods for measuring the impedance of Lithium-ion batteries during ageing

Stroe, D. L., Swierczynski, M. J., Stroe, A-I., Knap, V., Teodorescu, R. & Andreasen, S. J., Mar 2015, Proceedings of the 2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER). IEEE Press, p. 1-8 8 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Open Access
File
Aging of materials
Systems analysis
Cooling systems
Electrochemical impedance spectroscopy
Health
4 Citations (Scopus)
587 Downloads (Pure)

Study on Self-discharge Behavior of Lithium-Sulfur Batteries

Knap, V., Stroe, D. L., Swierczynski, M. J., Teodorescu, R. & Schaltz, E., 2015, In : ECS Transactions. 70, 1, p. 95-103

Research output: Contribution to journalConference article in JournalResearchpeer-review

File
Polysulfides
Energy storage
Electric potential
Temperature
Lithium sulfur batteries
9 Citations (Scopus)
408 Downloads (Pure)

Suggested Operation Grid-Connected Lithium-Ion Battery Energy Storage System for Primary Frequency Regulation: Lifetime Perspective

Stroe, D. I., Knap, V., Swierczynski, M. J., Stroe, A-I. & Teodorescu, R., Sep 2015, Proceedings of the 2015 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE Press, p. 1105 - 1111

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Open Access
File
Energy storage
Demonstrations
Lithium-ion batteries
2014
32 Citations (Scopus)
1146 Downloads (Pure)

Diagnosis of Lithium-Ion Batteries State-of-Health based on Electrochemical Impedance Spectroscopy Technique

Stroe, D. I., Swierczynski, M. J., Stan, A-I., Knap, V., Teodorescu, R. & Andreasen, S. J., Sep 2014, Proceedings of the 2014 Energy Conversion Congress and Exposition (ECCE). IEEE Press, p. 4576-4582

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Open Access
File
Electrochemical impedance spectroscopy
Health
Energy storage
Lithium-ion batteries
Time measurement
27 Citations (Scopus)
900 Downloads (Pure)

Grid Inertial Response with Lithium-ion Battery Energy Storage Systems

Knap, V., Sinha, R., Swierczynski, M. J., Stroe, D. I. & Chaudhary, S., Jun 2014, Proceedings of the 23rd IEEE International Symposium on Industrial Electronics, ISIE 2014. IEEE Press, p. 1817-1822 6 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Open Access
File
Energy storage
Wind power
Dynamic models
Power plants
Lithium-ion batteries
2013
821 Downloads (Pure)

Primary Frequency Regulation with Li-Ion Battery Energy Storage System - Evaluation and Comparison of Different Control Strategies

Thorbergsson, E., Knap, V., Swierczynski, M. J., Stroe, D. I. & Teodorescu, R., 2013, Proceedings of the 35th International Telecommunications Energy Conference 'Smart Power and Efficiency', INTELEC 2013 . IEEE Press, p. 178 6 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Open Access
File
Energy storage
Economics
Power plants
Degradation
Economic analysis