Charge state evaluation method and system of power lithium ion battery
A lithium-ion battery and state of charge technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as divergence in the filtering estimation process, large estimation errors, and changes in noise statistical characteristics
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[0111] Embodiment of the method for estimating the state of charge of a power lithium-ion battery
[0112] The first step, model building, experiment and formula identification model parameters
[0113] I. Build a model
[0114] Establish a third-order RC equivalent circuit model of an equivalent power lithium-ion battery, such as figure 1 shown, the polarization resistance R 1 , R 2 and R 3 respectively and capacitance C 1 、C 2 and C 3 Three RC circuits are formed, and the three RC circuits connected in series are connected in series with the open circuit voltage OCV and ohmic internal resistance R of the power lithium-ion battery. 00 , the terminal voltage of the equivalent circuit model is the output terminal voltage Y of the power lithium-ion battery L .
[0115] The corresponding mathematical model is as follows:
[0116] dU 1 dt ...
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