Journal
ENERGIES
Volume 8, Issue 8, Pages 8467-8481Publisher
MDPI
DOI: 10.3390/en8088467
Keywords
lithium-ion batteries; state-of-health (SOH); wide temperature range; resistance increase; capacity loss
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Funding
- National Natural Science Funds of China [NSFC: 51361130153]
- UK Engineering and Physical Sciences Research Council [EPSRC: EP/L001063/1]
- Research and Development of Application Technology Plan Project in Heilongjiang Province of China [GA13A202]
- Science and Technology Project of the State Grid Corporation of China
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A state-of-health (SOH) estimation method for electric vehicles (EVs) is presented with three main advantages: (1) it provides joint estimation of cell's aging states in terms of power and energy (i.e., SOHP and SOHE)because the determination of SOHP and SOHE can be reduced to the estimation of the ohmic resistance increase and capacity loss, respectively, the ohmic resistance at nominal temperature will be taken as a health indicator, and the capacity loss is estimated based on a mechanistic model that is developed to describe the correlation between resistance increase and capacity loss; (2) it has wide applicability to various ambient temperaturesto eliminate the effects of temperature on the resistance, another mechanistic model about the resistance against temperature is presented, which can normalize the resistance at various temperatures to its standard value at the nominal temperature; and (3) it needs low computational efforts for on-board applicationbased on a linear equation of cell's dynamic behaviors, the recursive least-squares (RLS) algorithm is used for the resistance estimation. Based on the designed performance and validation experiments, respectively, the coefficients of the models are determined and the accuracy of the proposed method is verified. The results at different aging states and temperatures show good accuracy and reliability.
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