Abstract
Due to the complexity of the state change mechanism of lithium batteries, there are problems such as difficulties in aging characterization. Establishing a state assessment model for lithium batteries can reduce its safety risk in energy storage power station applications. Therefore, this paper proposes a method for establishing a lithium battery model including aging resistance under the combination of digital and analog, and uses the time–frequency domain test analysis method to establish the aging impedance expression to realize the parameterization of the aging process and state estimation of lithium batteries. A battery model that can characterize the battery aging process is established by combining digital and simulation methods, and the equivalent representation of the lithium battery aging process is realized. Finally, a simulation example is designed to verify its effectiveness, which provides important reference value for the practical engineering application of lithium battery energy storage system.
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