A method for homogenizing the flow of electrolyte in a flow battery
A flow battery and electrolyte technology, applied in the field of energy storage, can solve problems such as affecting the mass transfer of the battery, uneven flow of the electrolyte, and reducing the overall performance of the battery, so as to improve the battery performance, increase the flow rate of the electrolyte, and reduce the flow rate. The effect of resistance
Active Publication Date: 2018-05-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
The flow uniformity of the electrolyte in the flow channel directly affects the mass transfer in the battery, which in turn affects the performance of the battery
In a traditional square diagonal flow battery, the electrolyte flows unevenly in the flow channel, the flow velocity near the inlet and outlet is high, and the flow velocity at the two corners adjacent to the inlet and outlet is low, which is easy to form a flow dead zone
The uneven distribution of the flow field makes the mass transfer at the inlet and outlet of the battery stronger, while the mass transfer at the two corners is weaker, resulting in a large local concentration polarization and reducing the overall performance of the battery.
Method used
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[0012] Taking a square flow battery with a square electrode shape as an example, the electrolyte of the positive electrode flows in from the positive electrode inlet and flows out from the positive electrode outlet after passing through the positive electrode. The water property is a, which is less than the hydrophilicity b of the electrode material in the middle of the positive electrode; the hydrophilicity of the electrode material of the positive electrode at the two diagonals away from the positive electrode inlet and the positive electrode outlet is c, which is greater than the hydrophilicity of the electrode material in the middle of the positive electrode Sex b(a-2 , its voltage efficiency is 0.95% higher than that of a square flow battery with the same hydrophilicity for positive and negative electrodes, and the higher the current density, the more obvious the improvement effect.
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The invention relates to a method for homogenizing the electrolyte flow of a flow battery, which increases the flow resistance at the inlet and outlet of the positive electrode of the electrolyte of the flow battery, and reduces the flow speed of the electrolyte passing through the positive electrode at the inlet and outlet of the positive electrode; Reduce the flow resistance at the corner and increase the flow rate of the electrolyte passing through the positive electrode away from the positive electrode inlet and outlet; increase the flow resistance at the negative electrode inlet and outlet of the flow battery electrolyte and reduce the electrolyte flow rate through the negative electrode at the negative electrode inlet and outlet; The two corners of the inlet and outlet reduce the flow resistance and increase the flow speed of the electrolyte passing through the negative electrode away from the negative electrode inlet and outlet. In order to improve the overall mass transfer inside the battery, increase the flow resistance at the inlet and outlet of the positive and negative electrodes of the battery to reduce the flow rate of the electrolyte; reduce the flow resistance at the two corners and increase the flow rate of the electrolyte, so that the flow of the electrolyte in the battery tends to be uniform In order to realize the enhancement of liquid phase mass transfer in the battery and the effect of improving the performance of the battery.
Description
technical field [0001] The invention relates to a method for uniformizing the electrolyte flow of a liquid flow battery, and belongs to the technical field of energy storage. Background technique [0002] Inside the flow battery, the electrolyte flows through the internal flow field to form a circulation loop, and the internal flow field of the battery is very important for the flow distribution of the electrolyte. In a traditional square diagonal flow battery, the positive and negative electrolytes flow into the battery through the positive and negative liquid inlets respectively, and then pass through the electrodes in the positive and negative half-cells, and the positive and negative electrolytes are generated at the active sites on the electrode surface. After the chemical reaction, the electrolyte flows out from the positive and negative liquid outlets. The flow uniformity of the electrolyte in the flow channel directly affects the mass transfer in the battery, which ...
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IPC IPC(8): H01M8/04276H01M8/18
CPCY02E60/50
Inventor 张华民郑琼邢枫李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI