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Method for identifying RC (resistor-capacitor) equivalent model of power battery

A technology of equivalent model and identification method, applied in the field of identification of efficiency models, can solve the problems of not involving the internal dynamics of the battery, not considering the influence of the diffusion of chemical components of the battery, and not considering the change of internal resistance, etc.

Active Publication Date: 2015-03-25
SHANDONG ACAD OF SCI INST OF AUTOMATION
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Problems solved by technology

Since this model is very simple, it does not consider that the internal resistance essentially changes with the temperature, SOC and electrolyte concentration, and the internal resistance of the battery is different in the state of charge and discharge, and does not involve the dynamics of the battery , especially without considering the influence of chemical composition diffusion between the electrodes of the battery during electrolysis

Method used

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  • Method for identifying RC (resistor-capacitor) equivalent model of power battery
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  • Method for identifying RC (resistor-capacitor) equivalent model of power battery

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Embodiment Construction

[0047]The first step is to use ITECH’s discharge equipment to conduct a discharge test on a single battery cell of the power battery, and record the voltage and current values ​​during the discharge process every 1 second. Through the battery performance test, it can be seen that the normal voltage of the battery is 2.800V to 4.245V, and the capacity is 2.3715Ah (Ampere hours). The discharge process is divided into 10 times, and the current value is used to discharge 10 times. The discharge capacity of each discharge is 0.23715Ah, and the pause time is 20 minutes after each discharge. The specific scheme is shown in Table 1, and Table 1 is the discharge experiment information table. According to the experimental test data, intercept the discharge data with SOC of 0.9, and determine the charge and discharge current i L , battery working voltage U L and battery operating voltage U L The corresponding open circuit voltage U oc ;

[0048] Table 1

[0049]

[0050] In the ...

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Abstract

The invention discloses a method for identifying an RC (resistor-capacitor) equivalent model of a power battery. The method comprises the following steps of: confirming an identification equation of the RC equivalent model, acquiring identification data, calculating an internal discharge resistance of the battery and identifying a least square method. According to the method, the dynamic and static features of the battery are reflected well; on one hand, the model has a relatively high precision characterization electric quantity parameter, and the charge and discharge behaviors of the battery can be simulated accurately under the condition that the temperature, the current and the internal resistance difference in the charge and discharge process are considered; and on the other hand, the model is relatively low in order, so that complex mathematic calculation is avoided, and the structure is relatively simple, thereby being conveniently processed in a computer. Therefore, the method for establishing a mathematic model by using the method for identifying the RC equivalent model of the power battery can be widely used in the research of the power battery, and particularly the research of a lithium ion battery.

Description

technical field [0001] The invention belongs to the field of battery management of pure electric vehicles, and relates to an identification method of an RC equivalent model of a power battery. Background technique [0002] As the power source of electric vehicles, power battery is the key factor affecting the performance of electric vehicles. It will have a direct impact on mileage, acceleration ability and maximum gradeability. Battery state of charge (SOC) estimation is the core and difficult point of battery management system research. The nonlinear characteristics of power batteries make it difficult for many filtering methods to obtain accurate estimation results. Therefore, it is necessary to establish a suitable mathematical model to characterize the external characteristics of the battery. . The better the consistency between the battery model and the characteristics of the power battery, the more accurate results can be obtained when using the filtering algorithm t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36G06F17/50
Inventor 侯恩广乔昕李小伟刘广敏李杨崔立志贺冬梅王知学
Owner SHANDONG ACAD OF SCI INST OF AUTOMATION
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