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Measurement of the electrolyte flow velocity and bubbles characterization during electrochemical reactions in lead-acid batteries using the PIV system

机译:使用PIV系统测量铅酸电池中电化学反应期间的电解质流速和气泡表征

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The fluid flow of electrolyte within the cells of the electrochemical batteries has a vital role on the performance of batteries. Many numerically and experimentally investigations have been carried out on this subject. In flooded electrolyte batteries during high rates charging and discharging process, due to the electrochemical reactions, insoluble gas bubbles are produced on the surface of electrodes and dispersed in the electrolyte. Despite the importance of the presence of bubbles on the electrolyte velocity and concentration field, in all studies, the presence of bubbles have been ignored. In this study, an experimental setup has been developed for measuring the electrolyte velocity in the flooded lead-acid batteries based on utilizing the Particle Image Velocimetry system. The results for different states of charge (SOCs) showed that by increasing the number of bubbles which occurs at high SOCs, the velocity of electrolyte flow increases. Also in the SOCs 40%, 60% and 100% compared to the SOC 0%, the averaged velocity of the electrolyte has increased about 16.8%, 29%, and 79%, respectively. The obtained results show that at higher SOCs, the effect of stratification phenomenon on the electrolyte velocity with respect to the effect of the presence of bubbles in the electrolyte is negligible. (C) 2020 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.
机译:电化学电池电池内电解液的流体流动对电池性能具有重要作用。在这个主题上进行了数控和实验研究。在高速率充电和放电过程中,由于电化学反应,由于电化学反应,在电极表面上产生不溶性气泡并分散在电解质中。尽管在电解质速度和浓度场上存在气泡存在的重要性,但在所有研究中,忽略了气泡的存在。在该研究中,已经开发了一种实验装置,用于根据利用粒子图像速度系统测量淹没的铅酸电池中的电解质速度。不同态的电荷(SoC)的结果表明,通过增加高SOC发生的气泡的数量,电解质流动的速度增加。与SOC 0%相比,SOC 40%,60%和100%,电解质的平均速度分别增加了约16.8%,29%和79%。所得结果表明,在较高的SOC中,分层现象对电解质中气泡存在的效果的电解质速度对电解质速度的影响可忽略不计。 (c)2020年由elsevier b.v发表的。代表朝鲜工程和工程化学学会。

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