用稳定内压估算氢镍电池荷电态的研究

发布时间：2018-06-19 05:10

  本文选题：氢镍电池 + 稳定内压　； 参考：《燕山大学》2016年硕士论文

【摘要】：氢镍电池(MH-Ni)因具有较长的寿命、优良的安全性、宽温度工作范围以及较高的充放电功率,尤其是在较低的温度下,具有比锂离子电池更高的充放电功率等优势,目前仍为混合动力车(HEV)的首选电源之一。在实际HEV应用中,系统必须及时、准确地将电池的荷电态(SOC)告知整车系统,而电池制作完成后,其稳定内压(P稳)与负极合金的平衡氢压(Peq,H2)存在一一对应的关系,则电池的稳定内压与负极合金的压力-组成等温线(P-C-T曲线)存在一定关系,稳定的内压可用于估算MH-Ni电池的SOC。因此对电池内压特性的研究具有重要意义。本文首先对D型动力电池制作完成后(初始状态)的充放电过程中内压变化的测试及分析,结果表明,电池的内压随着充电时间的延长而升高,在随后的静置及放电过程中逐渐降低,甚至恢复至初始内压值;随着充放电倍率的增大,电池的内压升高;环境温度越大,内压越高;化成制度、注液量、极片的压实密度等均影响电池内压的大小。通过在线准确提取不同SOC下,电池内部气体的稳定内压,建立不同温度下,电池初始状态的P稳与SOC关系,结果表明,二者的关系曲线与合金的P-C-T曲线的变化规律一致。分别对常温下1C循环不同次数、高温(60℃)存储、模拟工况循环不同周期后的D型电池进行性能测试,并建立不同温度下P稳与SOC的数学关系,通过对二者关系曲线进行拟合分析,结果表明,相同温度下,随着电池的存储或使用,二者关系逐渐经由二次函数向多项式转变,满足关系式y=ax4+bx3+cx2+dx+e,其中,y代表P稳,x代表SOC,其取值范围为0-100间的任一值。
[Abstract]:Because of its long life, good safety, wide temperature range and high charge and discharge power, MH-Ni has the advantages of higher charge and discharge power than lithium ion battery at lower temperature. It is still one of the preferred power sources for HEV. In the practical application of HEV, the system must inform the whole vehicle system of the charged state of the battery in time and accurately. After the battery is made, the stable internal pressure (P) has a one-to-one correspondence with the equilibrium hydrogen pressure of the anode alloy (PeqH2). There is a relationship between the stable internal pressure of the battery and the P-C-T curve of the pressure composition isotherm of the anode alloy. The stable internal pressure can be used to estimate the SOC of Ni-MH battery. Therefore, it is of great significance to study the internal pressure characteristics of the battery. In this paper, the change of internal pressure during charge and discharge process of D type power battery is measured and analyzed. The results show that the internal pressure of D type battery increases with the increase of charging time. During the subsequent statics and discharge, the internal pressure of the battery gradually decreased, and even recovered to the initial internal pressure; with the increase of charge and discharge rate, the internal pressure of the battery increased; the higher the ambient temperature, the higher the internal pressure; the formation system, the liquid flux, The compaction density of the electrode plate affects the internal pressure of the battery. The stable internal pressure of the gas in the battery is accurately extracted from different SOC on line, and the relationship between P stability and SOC in the initial state of the battery at different temperatures is established. The results show that the relationship curve between them is consistent with the P-C-T curve of the alloy. The performance of D type battery with different times of 1C cycle at room temperature and 60 鈩，

本文编号：2038602