本文選題：鋰離子電池 + 多尺度模型�。� 參考：《中南大學》2014年碩士論文

【摘要】：摘要：由于多尺度跨越和多物理場耦合的存在,使用常規(guī)實驗研究方法難以對鋰離子電池系統(tǒng)進行快速、高效和低成本預估,造成了電池研發(fā)設計的困難。本文以2.3Ah,26650圓柱型磷酸鐵鋰鋰離子電池為研究對象,結合材料動態(tài)參數(shù)響應的特點,開展了鋰離子電池多尺度電化學模型的構建和應用研究,為鋰離子電池的優(yōu)化設計提供理論基礎,同時推廣了電化學模擬的應用領域。 1.針對目前鋰離子電池體系材料種類多、多物理場作用明顯而帶來的電池模型參數(shù)不全或自適應性差的問題,提出了材料參數(shù)動態(tài)響應的解決方法。重點解析了電極相關動態(tài)參數(shù)、電解液相關動態(tài)參數(shù)的變化規(guī)律,并提出了材料動態(tài)響應的構建方式和作用機制。 2.基于材料參數(shù)動態(tài)響應建立了鋰離子電池準二維模型,通過與實驗結果相對比驗證了模型的準確性。利用該模型研究了鋰離子電池的脈沖放電和恒流放電行為。 3.基于材料參數(shù)動態(tài)響應建立了鋰離子電池單顆粒模型。利用該模型研究了磷酸鐵鋰電池的性能提升方向,包括粒徑優(yōu)化、固相擴散性能優(yōu)化等方面。與準二維模型相比,單顆粒模型具有計算效率高的優(yōu)勢。
[Abstract]:Absrtact: due to the existence of multi-scale crossover and multi-physical field coupling, it is difficult to predict the lithium ion battery system quickly, efficiently and cheaply by using conventional experimental research methods, which results in the difficulty of battery R & D and design. In this paper, a multiscale electrochemical model for lithium iron phosphate battery was constructed and applied to the study of 2.3Ahn26650 cylindrical lithium-ion phosphate battery, combined with the characteristics of material dynamic parameter response. It provides a theoretical basis for the optimal design of lithium-ion batteries and extends the application field of electrochemical simulation. 1. In order to solve the problem of incomplete model parameters or poor adaptability caused by the variety of materials and the obvious effect of multi-physical fields, a solution to the dynamic response of material parameters is proposed. The dynamic parameters of electrode and electrolyte were analyzed, and the construction and mechanism of material dynamic response were put forward. 2. Based on the dynamic response of material parameters, the quasi-two-dimensional model of lithium ion battery is established, and the accuracy of the model is verified by comparing with the experimental results. The pulse discharge and constant current discharge behavior of lithium ion battery were studied by using this model. 3. A single particle model of lithium ion battery was established based on the dynamic response of material parameters. The model was used to study the performance improvement direction of lithium iron phosphate battery, including particle size optimization, solid diffusion performance optimization and so on. Compared with the quasi-two-dimensional model, the single-particle model has the advantage of high computational efficiency.
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM912

【參考文獻】

相關期刊論文 前2條

1 湯依偉;賈明;程昀;張凱;張紅亮;李R，

本文編號：1843985