Identification method of second order resistance and capacitance (RC) equivalent model of power lithium battery

An equivalent model and identification method technology, applied in the field of effective model identification, can solve problems such as simple structure

Active Publication Date: 2013-07-10
QINGDAO VECCON ELECTRIC
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Problems solved by technology

The first-order RC model can better reflect the dynamic and static characteristics of the battery; considering the temperature, current, and internal resistanc...

Method used

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  • Identification method of second order resistance and capacitance (RC) equivalent model of power lithium battery
  • Identification method of second order resistance and capacitance (RC) equivalent model of power lithium battery
  • Identification method of second order resistance and capacitance (RC) equivalent model of power lithium battery

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0050] The first step is to use ITECH’s discharge equipment to conduct a discharge test on a single cell of the power lithium 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 2.4208Ah (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 0.24208Ah, 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, the discharge data with SOC of 0.8 is intercepted to determine the charge and discharge current i L , battery working voltage U ...

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Abstract

The invention discloses an identification method of a second order resistance and capacitance (RC) equivalent model of a power lithium battery based on a second order RC model. The identification method of the second rate RC equivalent model of the power lithium battery includes the steps of confirmation of an identification equation of the second order RC equivalent model, acquisition of identification data, calculation of battery ohm internal resistance and identification of the least square method. By means of the identification of the second order RC equivalent model of the power lithium battery, the dynamic and static performances of the battery can be reflected well; on one hand, the RC equivalent model has more precise characterization electrical parameters, the dynamic behavior of charging and discharging of the battery can be simulated scientifically and precisely in consideration of temperature, current and internal resistance difference in the process of charging and discharging; on the other hand, the order of the model is two, no complicated mathematical calculation is needed, and thus a computer can process the model conveniently. Therefore, a mathematical model is established by using the second order RC equivalent model, the state of charge (SOC) of the battery can be evaluated scientifically and precisely, and the identification method of the second rate RC equivalent model of the power lithium battery can be widely used in the research and application of the power lithium battery.

Description

technical field [0001] The invention belongs to the field of electric vehicle battery management, and relates to an identification method for a second-order RC equivalent model of a power lithium battery. Background technique [0002] With the increasingly prominent energy and environmental protection issues, electric vehicles are highly valued by countries all over the world for their advantages of zero emission and low noise. As one of the key technologies for the development of electric vehicles, the battery management system The key to optimization, and accurate estimation of the SOC (State of Charge) of the battery is the premise and key to the good operation of the power lithium battery management system. The nonlinear characteristics of power lithium batteries make it difficult for many filtering methods to obtain scientific and accurate estimation results. Therefore, it is necessary to establish a suitable mathematical model to characterize the external characteristi...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 侯恩广乔昕李小伟刘广敏李杨崔立志贺冬梅
Owner QINGDAO VECCON ELECTRIC
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