Improving the flooded-electrolyte batteries performance in fast charging and discharging processes has attracted many researchers. Due to electrochemical reactions during charging and discharging process in these batteries, many insoluble gas bubbles are produced within the electrolyte. These bubbles have a major effect on the performance of the electrodes and the rate of electrochemical reactions. On the other hand, the electrolyte flow rate plays an important role on the performance of the battery. In the present investigation, the effect of surface tension on the production of insoluble bubbles and velocity of electrolyte flow have been investigated experimentally when different types of surfactants are added to the electrolyte. In addition, a Particle Image Velocimetry setup has been used in order to measure the velocity of electrolyte flow and the behavior of bubbles. The results declared that the capacity of battery enhances about 16% and 10% by adding Triton X100 and SDS surfactants, respectively. Hence, the averaged electrolyte velocities during charging process reduces about 11% and 13% when Triton X100 and SDS, repectively; are used as surfactants. Also, the effect of adding different amounts of SDS surfactant on the mean diameter, rising velocity and production rates of bubbles have been illustrated comprehensively.

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One of the leading challenges for researchers is meeting the industry's need for fast charging-discharging and high capacity batteries, increasing the Chargedischarge rate (C-rate) always followed by high temperatures due to thermoelectrochemical reactions and a drastic reduction in the capacity of batteries. Flooded lead-acid batteries (FLABs) as the most common batteries are provided power for different equipment such as forklifts, submarines, emergency power back up, and for many electrical and telecommunications applications in the industry, has been studied in this article. The effect of three critical parameters of FLAB includes the electrode gaps, roughness quality of electrode surfaces, and C-rate on the capacity and temperature rise (TR) rate are experimentally investigated. Using the response surface methodology based on the central composite design model, the effect of these parameters on the performance of the battery is also evaluated, and a new correlation is proposed. Analysis of variance of 40 tests performed in this study showed that the C-rates have the most effect while the surface roughness of electrodes has the least effect on the capacity increase and the reduction of TR rate. The experimental results showed that the C-rate of C5 with electrode gaps of 4 mm had the optimal response in reaching the maximum capacity and the minimum TR rate.

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