Thermal modeling of industrial-scale vanadium redox flow batteries in high-current operations
Thermal modeling of industrial-scale vanadium redox flow batteries in high-current operations
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DOI：
10.1016/j.jpowsour.2019.03.080
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发表时间：
2019-06
影响因子：
9.2
通讯作者：
Andrea Trovò;Alberto Saccardo;M. Giomo;M. Guarnieri
中科院分区：
文献类型：
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作者：
Andrea Trovò;Alberto Saccardo;M. Giomo;M. Guarnieri
提出了一种模拟钒氧化还原液流电池充放电过程动态热行为的电池解析模型。它考虑了在电池水平上电化学反应的可逆熵热、过电位引起的不可逆热、离子交叉引起的自放电反应和分流电流损失。该模型考虑了单元间和向环境的传热、泵的水力损失以及管道和储罐的传热。它提供了每个电池、电池堆入口和出口、管道和槽内的电解质温度。根据9kW/ 27kwh VRFB测试设备的充电/放电测量结果进行了验证。该模型已用于研究具有相同堆叠但容量更大的VRFB，在±400 a下工作8小时，以确定能够在高电流密度下工作的下一代工业VRFB堆叠中可能出现的临界热条件。在长时间放电结束时，当温度超过50°C时，发现最关键的情况，可能导致vo2 +沉淀和电池故障。这些结果要求为高功率VRFB系统量身定制热交换器。
A cell-resolved model that simulates the dynamic thermal behavior of a Vanadium Redox Flow Battery during charge and discharge is presented. It takes into account, at a cell level, the reversible entropic heat of the electrochemical reactions, irreversible heat due to overpotentials, self-discharge reactions due to ion crossover, and shunt current losses. The model accounts for the heat transfer between cells and toward the environment, the pump hydraulic losses and the heat transfer of piping and tanks. It provides the electrolyte temperature in each cell, at the stack inlet and outlet, along the piping and in the tanks. Validation has been carried out against the charge/discharge measurements from a 9kW/27 kWh VRFB test facility. The model has been applied to study a VRFB with the same stack but a much larger capacity, operating at±400 A for 8 h, in order to identify critical thermal conditions which may occur in next-generation industrial VRFB stacks capable to operating at high current density. The most critical condition has been found at the end of a long discharge, when temperatures above 50° C appeared, possibly resulting in V O 2+ precipitation and battery faults. These results call for heat exchangers tailored to assist high-power VRFB systems.