The existing battery SOH estimation method mainly has the following:1 Direct discharge method: It is a method for evaluating the effect of the load on the battery SOH. This method is complex, requiring the SOH of the offline to test the battery, and cannot be realized online.
2 Measuring the internal impedance method: The SOH of the battery can be characterized by the relationship of ohmic resistance, and the ohmic interformance of the battery is obtained by measuring analysis, thus calculating the SOH of the battery;
3 Electrochemical Impedance Analysis (ELECTROCHEMICAL IMPEDANCE SPECTROPY, EIS): The main idea of this method is to apply a plurality of sinusoidal signals to be measured, and analyze the data information obtained by fuzzy theory, predict the aging of the battery, this method requires a lot Experimental data, low practicality;
4 Chemical Analysis: This method is estimated by measuring the change in electrolyte density, but the method must damage the battery structure so that the battery can no longer use;
5 Modern estimation method: mainly Kalman filtering algorithm, neural network algorithm, fuzzy logic algorithm, etc., these methods can qualitatively analyze the state of the battery, and the actual application effect is better.
In this paper, the current battery state is low, the difference is poor, and the second-order THEVENIN in-lithium ion battery is used, and the battery status is real-time using adaptive unscented Kalman Filter, Aukf) algorithm. estimate.
Adaptive elsencing algorithm algorithm combined with elsencing Kalman filter algorithm and extended Kalman algorithm, establishing a cyclic iterative relationship, known battery parameters estimates battery state, and then uses the battery status as a known amount of estimated model parameters, in this type Recursive calculation, estimated battery SOC and ohm internal resistance in real time.
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The battery SOH can be estimated at real time using ohmic resistance to the function of the battery SOH. The residual use of the battery pack is quantified by estimating the overall health status of each unit cell and battery pack in the battery pack, and the ladder utilization scheme of the battery pack is developed.
Figure 1 Battery second-order THEVENIN Equivalent Circuit Model
Acid battery: The electrolyte of acid batteries is generally composed of dilute sulfuric acid (H2SO4) or colloidal sulfuric acid, and the plates are composed of lead Pb and alumina PbO2, and the electric charge is stored by chemical reaction, and functions to battery energy.
Alkaline battery: The electrolyte of alkaline batteries is generally composed of potassium hydroxide KOH or sodium hydroxide NaOH (sterile). The polar plate is different due to the structure of the battery. Such as cadmium nickel battery positive electrode plate is a nickel hydroxide Ni (OH) 3, the negative electrode plate is a cadmium CD; the positive electrode plate of the ferrite battery is nickel hydroxide Ni (OH) 3, the negative electrode plate is iron Fe; silver zinc battery positive plate It is a peroxide AG2O3 and the negative electrode plate is zinc Zn.
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