COMSOL的液流电池极板上的电流分布

摘要社会在发展，人们对电能的需求也越来越大，风能、太阳能等一系列可再生能源的发展和应用得到了大家越来越多的重视，所以，我们需要大规模的储能技术以解决风能、太阳能等可再生能源的不连续性、不稳定性、不可控性等非稳态特性。氧化还原液流电池是通过电解质溶液中的活性物质发生可逆氧化还原反应即通过价态的可逆变化来实现化学能和电能之间的转化，以及实现电能的大规模存储和释放。86027

本文建立了锌镍单液流电池的三维稳态模型，该模型的建立基于复杂的物理化学现象，考虑电解质溶液的传质影响以及极板上的电化学反应过程，其中所涉及到的方程有质量、动量、电荷方程并耦合了反应动力学方程。通过对锌镍单液流电池极板上的电化学反应以及电解质溶液的传质进行理论分析，计算锌镍单液流电池极板上的电流分布，通过分析流场、浓度场、电流密度分布等，得到如下结果：在电化学反应过程下，液相传质过程中锌酸根离子影响远大于氢氧根离子的。同时，在使用圆角、倒角等非尖锐的物理结构的条件下，可以有效降低电流集聚。

毕业论文关键字：锌镍液流电池；极板；电流密度分布

Abstract With the development of society, people need more and more energy。 more and more attention to the development and application of wind energy, solar energy and other renewable energy。 We need large-scale energy storage technology to solve the non-steady state characteristics, such as discontinuity, instability and non-controllability of wind energy, solar energy and other renewable energy source。 Redox flow battery is a reversible redox reaction of the active substance in the positive and negative electrode electrolyte solution。 The transformation of chemical energy and electric energy can realize the reversible change of the valence state, as well as the realization of electric energy。

This paper establishes a three-dimension model of Zn/Ni single flow battery, The model is built on the basis of complex physical and chemical phenomena, considering the mass transfer and the electro-chemical reaction process on the plate。 The equations have mass, momentum, and charge equations and coupled with the reaction kinetic equations。 through the theoretical analysis of zinc nickel single liquid flow battery plate electrochemical reaction and electrolyte solution of mass transfer for calculated Zn Ni single fluid stream battery plate current distribution。 Through the analysis of the flow field, concentration field, the distribution of current density obtain results are as follows: In the electrochemical reaction, the process under the effect of zinc ions in liquid phase mass transfer process is far greater than the hydroxyl ions。 The chamfer, fillet, or avoid the use of the physical structure of sharp, can effectively reduce the current phenomenon of agglomeration。

Keywords: Zn/Ni flow battery; electrode; current density distribution

第一章绪论 1

1。1 研究背景和意义 1

1。2 液流电池的概述 1

1。2。1 液流电池的发展及分类 1

1。2。2 液流电池的工作原理 4

1。3 锌镍单液流电池的概述 5

1。3。1 锌镍单液流电池的工作原理 5

1。3。2 锌镍单液流电池的镍电极和锌负极 6

1。3。3 锌镍单液流电池的电解液 7

1。3。4 锌镍单液流电池的特点 COMSOL的液流电池极板上的电流分布:http://www.youerw.com/zidonghua/lunwen_101718.html