New Experimental Approach for the Determination of the Heat Generation in a Li-Ion Battery Cell

Rouven Christen, Björn Martin and Gerhard Rizzo
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Rouven Christen: Institute for Development of Mechatronic Systems, OST Eastern Switzerland University of Applied Sciences, Werdenbergstrasse 4, CH-9471 Buchs, Switzerland
Björn Martin: Institute for Development of Mechatronic Systems, OST Eastern Switzerland University of Applied Sciences, Werdenbergstrasse 4, CH-9471 Buchs, Switzerland
Gerhard Rizzo: Institute for Development of Mechatronic Systems, OST Eastern Switzerland University of Applied Sciences, Werdenbergstrasse 4, CH-9471 Buchs, Switzerland

Energies, 2021, vol. 14, issue 21, 1-14

Abstract: With regard to safety, efficiency and lifetime of battery systems, the thermal behavior of battery cells is of great interest. The use of models describing the thermoelectric behavior of battery cells improves the understanding of heat generation mechanisms and enables the development of optimized thermal management systems. In this work, a novel experimental approach is presented to determine both the irreversible heat due to ohmic losses and the reversible heat due to entropy changes directly via heat flow measurements. No additional information about thermal properties of the battery cell, such as heat capacity or thermal conductivity, are required. Thus, the exothermic and endothermic nature of reversible heat generated in a complete charge/discharge cycle can be investigated. Moreover, the results of the proposed method can potentially be used to provide an additional constraint during the identification process of the equivalent circuit model parameters. The described method is applied to a 23 A h lithium titanate cell and the corresponding results are presented.

Keywords: lithium-ion battery cell; experimental method; reversible heat; equivalent circuit model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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