单液流锌镍电池PNGV等效电路建模与性能分析
发布时间：2018-12-18 16:44
【摘要】：液流电池由于具有可规模储能、充放电转换速率快,循环寿命长等优势而备受关注。北京防化研究院分析单液流铅酸电池特点结合传统的锌镍电池优缺点于2007年研制出单液流锌镍电池,该体系解决传统锌镍电池锌枝晶问题,提高了电池的循环寿命；电池可刷新维护保持性能、不需要隔膜等优点使其具有很高的研究价值。为了更好的研究单液流锌镍电池的性能,需要对电池进行建模,分析电池的电压特性。 本文首先分析单液流锌镍电池电压关系,把电池欧姆内阻用电阻等效,极化电压的变化与RC并联电路响应曲线类似,因此采用并联RC电路等效,电池开路电压用电压源等效,充放电过程中其开路电压的变化用电容等效,建立PNGV等效电路模型,推导充放电过程端电压关于充放电时间的关系,然后采用混合脉冲功率实验获取模型参数,最后得到模型充放电过程端电压变化曲线,并与实验数据进行对比验证模型准确性。 基于PNGV模型与单液流锌镍电池电化学机理分析,把电池由双电层而产生的电化学极化与扩散而产生的浓差极化分别采用RC并联电路进行等效。本文提出了改进的PNGV单液流锌镍电池等效电路模型,然后采用零阶保持器离散化处理,得到关于时间的充放电离散化模型,最后基于遗忘因子的最小二乘法进行在线辨识模型参数,预测电池充放电电压变化曲线,并与第三章建立的PNGV等效电路模型进行对比,总结改进模型优点。 对电池进行实验分析在不同条件下的效率,主要得到以下结果：1)在小于120A放电电流下,其容量效率在95%以上；大电流放电可缩短放电时间,但其容量效率较低。2)与连续放电相比,采用间隙放电、放电截止后进行小电流放电均可以提高电池的容量效率。3)不同深度充放电其容量效率均保持在95%以上,使用时可根据实际需要的容量,来选择充电深度,提高电池的使用效率。4)电池200个循环左右时电池容量效率低于85%,需要对电池进行刷新维护,恢复其特性。
[Abstract]:Liquid-flow batteries have attracted much attention due to their advantages of large scale energy storage, fast charge-discharge conversion rate and long cycle life. Based on the analysis of the characteristics of single liquid lead acid battery combined with the advantages and disadvantages of traditional zinc nickel battery, the single liquid flow zinc nickel battery was developed in 2007. The system solves the zinc dendrite problem of traditional zinc nickel battery and improves the cycle life of the battery. Battery can refresh the maintenance and maintain performance, do not need the advantages of diaphragm, so it has high research value. In order to better study the performance of single flow zinc-nickel battery, it is necessary to model the battery and analyze the voltage characteristics of the battery. In this paper, the voltage relationship of single liquid flow zinc-nickel battery is first analyzed. The ohmic resistance of the battery is equivalent to that of the ohmic resistance, and the polarization voltage is similar to the response curve of the RC parallel circuit. Therefore, the parallel RC circuit is used as the equivalent circuit, and the open circuit voltage of the battery is equivalent to the voltage source. The change of open circuit voltage in charge / discharge process is equivalent to capacitance. The PNGV equivalent circuit model is established, and the relationship between terminal voltage and charge / discharge time during charge / discharge process is deduced. Then the model parameters are obtained by hybrid pulse power experiment. Finally, the terminal voltage curve of the model is obtained and compared with the experimental data to verify the accuracy of the model. Based on the PNGV model and the electrochemical mechanism analysis of single liquid flow zinc nickel battery, the concentration polarization caused by the electrochemical polarization and diffusion produced by the double layer is equivalent to the RC parallel circuit. In this paper, an improved equivalent circuit model of PNGV single flow zinc-nickel battery is proposed, and then the zero order holdout discretization is used to obtain the charge and discharge discretization model about time. Finally, the model parameters are identified online based on the least square method based on the forgetting factor, and the battery charge / discharge voltage variation curve is predicted. The model is compared with the PNGV equivalent circuit model established in Chapter 3, and the advantages of the improved model are summarized. The results are as follows: 1) when the discharge current is less than 120A, the capacity efficiency is more than 95%; High current discharge can shorten discharge time, but its capacity efficiency is lower. 2) compared with continuous discharge, gap discharge is used. Low current discharge after discharge cutoff can improve the capacity efficiency of the battery. 3) charging and discharging at different depth can keep the capacity efficiency above 95%, and the charging depth can be selected according to the actual capacity. 4) the battery capacity efficiency is lower than 85 when the battery cycle is about 200 cycles, so it is necessary to refresh and maintain the battery and restore its characteristics.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM912
本文编号：2386133
[Abstract]:Liquid-flow batteries have attracted much attention due to their advantages of large scale energy storage, fast charge-discharge conversion rate and long cycle life. Based on the analysis of the characteristics of single liquid lead acid battery combined with the advantages and disadvantages of traditional zinc nickel battery, the single liquid flow zinc nickel battery was developed in 2007. The system solves the zinc dendrite problem of traditional zinc nickel battery and improves the cycle life of the battery. Battery can refresh the maintenance and maintain performance, do not need the advantages of diaphragm, so it has high research value. In order to better study the performance of single flow zinc-nickel battery, it is necessary to model the battery and analyze the voltage characteristics of the battery. In this paper, the voltage relationship of single liquid flow zinc-nickel battery is first analyzed. The ohmic resistance of the battery is equivalent to that of the ohmic resistance, and the polarization voltage is similar to the response curve of the RC parallel circuit. Therefore, the parallel RC circuit is used as the equivalent circuit, and the open circuit voltage of the battery is equivalent to the voltage source. The change of open circuit voltage in charge / discharge process is equivalent to capacitance. The PNGV equivalent circuit model is established, and the relationship between terminal voltage and charge / discharge time during charge / discharge process is deduced. Then the model parameters are obtained by hybrid pulse power experiment. Finally, the terminal voltage curve of the model is obtained and compared with the experimental data to verify the accuracy of the model. Based on the PNGV model and the electrochemical mechanism analysis of single liquid flow zinc nickel battery, the concentration polarization caused by the electrochemical polarization and diffusion produced by the double layer is equivalent to the RC parallel circuit. In this paper, an improved equivalent circuit model of PNGV single flow zinc-nickel battery is proposed, and then the zero order holdout discretization is used to obtain the charge and discharge discretization model about time. Finally, the model parameters are identified online based on the least square method based on the forgetting factor, and the battery charge / discharge voltage variation curve is predicted. The model is compared with the PNGV equivalent circuit model established in Chapter 3, and the advantages of the improved model are summarized. The results are as follows: 1) when the discharge current is less than 120A, the capacity efficiency is more than 95%; High current discharge can shorten discharge time, but its capacity efficiency is lower. 2) compared with continuous discharge, gap discharge is used. Low current discharge after discharge cutoff can improve the capacity efficiency of the battery. 3) charging and discharging at different depth can keep the capacity efficiency above 95%, and the charging depth can be selected according to the actual capacity. 4) the battery capacity efficiency is lower than 85 when the battery cycle is about 200 cycles, so it is necessary to refresh and maintain the battery and restore its characteristics.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM912
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