On the Parallel-Connected Li-Ion Batteries, Impedance Spectrum and Battery Safety Design by Electrochemical Approach
Date Issued
2014
Date
2014
Author(s)
Huang, Chih-Sheng
Abstract
Recent years, the research on the electric vehicle is increasing due to the shortage of fossil fuel. Lithium battery, which has high power density and enrgy, is a well choice as power source for electric vehicle. However, the exmperiment for studying lithium battery pack is expensive and time-consuming. Therefore, we try to analyze and predict the efficiency of battery pack by simulation to decrease the experimental cost. There are five groups of important problems, which are prediction of battery pack discharge efficiency, prediction of battery pack temperature distribution, prediction of battery pack cycle life, safety of battery pack design and detection of battery pack, about the developement of electric vehicle will be discuss in this thesis.
We have a cooperation with ITRI which offer us experimental data about battery pack to study battery pack discharge efficiency, battery pack temperature distribution and prediction of battery pack cycle life. By the electrochemical model we built, the simulation result of battery pack’s discharge curve and temperature variation has a well agreement with experimental data.
ITRI developes a kind of material called STOBA, which is added in lithium battery to prevent thermal runaway during nail penetration test. According to the nail penetration experimental result, the battery with STOBA will not burn and explode. Then, we try to figure out the mechanics of STOBA and simulate the process during nail penetration test by electrochemical model.
We use the nondestructive testing which is impedance spectrum measurement to detect the status of battery. By analyze the impedance spectrum, we will obtain the information about battery. It is very helpful on the battery detection.
Subjects
鋰離子電池
電池組
電池並聯
溫度分布
循環壽命
STOBA
阻抗頻譜
Type
thesis
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