Measuring the reversible heat of lithium-ion cells via current pulses for modeling of temperature dynamics
| Autor: | B. Bedürftig, Richard D. Braatz, Andreas Gruhle, T. Hüfner, Rolf Findeisen, M. Oldenburger, E. Richter |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Battery (electricity)
Materials science Renewable Energy Sustainability and the Environment Open-circuit voltage Lithium iron phosphate Enthalpy Energy Engineering and Power Technology chemistry.chemical_element Thermodynamics 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Ion Entropy (classical thermodynamics) chemistry.chemical_compound chemistry Lithium Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology Electrical impedance |
| Zdroj: | Journal of Power Sources. 506:230110 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2021.230110 |
| Popis: | This article introduces a novel calorimetric measurement method, namely the ‘Double Pulse Method’, to measure reversible heat in lithium-ion battery cells. In Li-ion cells, reversible heat has a material-dependent characteristic as it is closely related to both entropy change and the temperature dependence of the open circuit voltage. The proposed method measures reversible heat as a highly resolved function of the cell’s state of charge. The determination of reversible heat is based on the evaluation of the temperature difference generated by two current pulses of opposite polarity. Unlike established potentiometric methods, the Double Pulse Method is simple to set up, fast, and cost-effective. The accuracy of the Double Pulse Method is demonstrated for an automotive lithium iron phosphate (LFP) cell, and the entropy changes are compared with measurements of the same cell using the established potentiometric method. Simulation results indicate that the cell temperature is more accurate when determined by the reversible heat measurement obtained by the Double Pulse Method than from the potentiometric method. |
| Databáze: | OpenAIRE |
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