Lithium iron phosphate battery SOC estimation method based on dynamic optimization forgetting factor recursive least square online identification
A technology of recursive least squares and lithium iron phosphate batteries, which is applied in the direction of testing electrical devices in transportation, measuring electricity, measuring electrical variables, etc.
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[0030] Create a second-order equivalent circuit model:
[0031] see figure 1 , U oc (t) is the open circuit voltage; R 0 (t) is the internal resistance in ohms; I(t) is the working current, positive for discharge; R 1 (t), R 2 (t) are electrochemical polarization internal resistance and concentration polarization internal resistance respectively, C 1 (t), C 2 (t) are electrochemical polarization capacitance and concentration polarization capacitance respectively [11] ; 1 (t) is the electrochemical polarization ring terminal voltage; U 2 (t) is the terminal voltage of the concentration polarization ring; U t (t) is the battery terminal voltage. According to Kirchhoff's voltage law and Kirchhoff's current law, the electrical relationship of the equivalent circuit model can be obtained as:
[0032]
[0033] Further, the open circuit voltage model is established:
[0034] In view of the fact that the open circuit voltage at the middle value of the SOC of the lithium ...
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