Method for predicting health state of lithium battery based on SREKF
A technology of health status and prediction method, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of large estimation error, low precision, and poor robustness.
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[0065] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0066] The method for predicting the state of health of lithium batteries based on SREKF of the present invention, the specific operation process includes the following steps:
[0067] Step 1, establish a mathematical model of the state parameters of the lithium battery, and obtain the state equation of the ohmic internal resistance of the lithium battery system and the observation equation of the ohmic internal resistance;
[0068] The specific process of step 1 is as follows:
[0069] like figure 1 As shown, U c is the terminal voltage of the lithium battery; U oc is the open circuit voltage of the battery; R 0 Is the ohmic internal resistance of the lithium battery; I is the working current of the battery; R s 、C s Respectively, the electrochemical polarization internal resistance and polarization capacitance of the battery represent...
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