Lithium ion power battery state-of-charge estimation method and device, medium and equipment
A technology of power battery and state of charge, which can be used in measuring devices, measuring electricity, measuring electrical variables, etc., and can solve the problem of low estimation accuracy.
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Embodiment 1
[0173] This embodiment discloses a method for estimating the state of charge of a lithium-ion power battery, which optimizes the nonlinear system filtering technology, and based on the Kalman filter method, realizes real-time dynamic estimation of the state of charge of a lithium-ion power battery, as shown in figure 1 As shown, the method includes:
[0174] S1. The SOC value algorithm estimation procedure starts.
[0175] S2. Importing the battery model, performing parameter identification on the imported battery model.
[0176] In this example, the battery model as figure 2 as shown in figure 2 Among them, it represents the electromotive force (EMF) of the battery, and the unit is volts (V). It has a certain functional relationship with the SOC of the power battery. Among them, R o Represents the ohmic internal resistance inside the power battery, the unit is ohm (Ω); the resistance-capacitance network parameter (R p1 ,C p1 ) is used to describe the first polarizatio...
Embodiment 2
[0259] This embodiment discloses a device for estimating the state of charge of a lithium-ion power battery, including a parameter identification module, an algorithm fusion module, an initialization module, an acquisition module, and an SOC value estimation module; the functions of each module are as follows:
[0260] The parameter identification module is used for parameter identification of the imported battery model;
[0261] The algorithm fusion module is used to construct the basic formula of power battery SOC estimation according to the identified model parameters, and integrate the basic formula of power battery SOC estimation into the Kalman filter algorithm;
[0262] The initialization module is used for the initialization assignment of Kalman filter state vector and error covariance matrix parameters;
[0263] The obtaining module is used to obtain the measured value of the power battery current collected in real time as the input vector of the Kalman filter;
[02...
Embodiment 3
[0267] This embodiment discloses a storage medium, which stores a program. When the program is executed by a processor, the method for estimating the state of charge of a lithium-ion power battery described in Embodiment 1 is implemented, specifically as follows:
[0268] Battery model import, parameter identification for the imported battery model;
[0269] According to the identified model parameters, the basic formula for power battery SOC estimation is constructed, and the basic formula for power battery SOC estimation is integrated into the Kalman filter algorithm;
[0270] Initial assignment of Kalman filter state vector and error covariance matrix parameters;
[0271] Obtain the measured value of the power battery current collected in real time as the input vector of the Kalman filter;
[0272] The fading factor is introduced into the fused Kalman filter, and the SOC value of the power battery is estimated based on the Kalman filter introduced with the fading factor. ...
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