A battery SOC estimation method and system based on dynamic impedance correction
A technology of dynamic impedance and estimation algorithm, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of high precision, unsatisfactory precision, and serious model dependence of particle filter method, and achieve low algorithm complexity and high precision Effect
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[0100] refer to Figure 3-11 , the first embodiment of the present invention:
[0101] The invention discloses a battery SOC estimation method based on dynamic impedance correction, which can estimate the SOC of the power battery, and adopts the dynamic impedance correction method to correct and update the parameters of the power battery model. The estimation of a highly nonlinear slow time-varying system such as a battery has the problem of low accuracy and small algorithm complexity.
[0102] A method for estimating battery SOC based on dynamic impedance correction of the present invention includes the following steps:
[0103] Step 1: Establish a mathematical model of battery open circuit voltage and SOC at different temperatures;
[0104] Step 2: On the basis of Step 1, identify the parameters of the battery equivalent circuit model offline;
[0105] Step 3: On the basis of steps 1 and 2, obtain a complete battery model and its coefficients;
[0106] Step 4: Calculate th...
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