A flow battery electrode frame structure
A liquid flow battery and electrode frame technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of complex design, reduced distribution uniformity, mutual leakage, etc., and achieve the goal of improving reliability and distribution uniformity Effect
Active Publication Date: 2019-11-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
In addition, the design of the public pipeline also has the self-discharge phenomenon of mutual leakage between the positive and negative electrodes, which is not conducive to the efficient and stable operation of the stack.
In the stack structure, both sides of the inlet and outlet of the electrode frame are covered with sealing gaskets to prevent internal leakage. These gaskets are deformed and elongated during the extrusion process, which will interfere with the inflow and outflow of the electrolyte. The distribution of liquid in each battery cell is uneven; in addition, when the number of battery cells increases, the distribution uniformity of this parallel liquid circuit method will decrease, which will affect the concentration polarization inside the battery. Fine-tuning the size of intersections to improve uniformity, complex design, and low assembly efficiency
Method used
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Embodiment 1
[0015] Using the electrode frame ( figure 1 ) Assemble a stack of 10 single cells. On one side of the stack, the tube row consisting of the positive electrolyte inlet through hole is connected to a main pipe; the negative electrolyte outlet through hole is connected to a tube row together. superior. On the side opposite to the side of the stack above, the tube row composed of positive electrolyte outlet through holes is connected to a main pipe; the tube row composed of negative electrolyte inlet through holes is connected to a main pipe together, and the four main pipes Responsible for the distribution of electrolyte among the cells. The material of the electrode frame is PVC, the middle electrode area is 875cm2, Nafion115 membrane is used as the ion exchange membrane, and the test current density is 80mA / cm 2 , The charge and discharge voltage efficiency of the stack is 86.2%, the Coulombic efficiency is 95.4%, and the energy efficiency is 82.2%. Among them, the single vo...
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Abstract
The invention relates to an electrode frame of a battery, and particularly designs an electrode frame structure of a redox flow battery. The side of the electrode frame is provided with an electrolyte inlet and outlet through hole, through which the electrolyte communicates with the flow channel in the electrode frame and flows through the electrode. This structure avoids the internal leakage caused by setting the common pipeline through-hole on the surface of the electrode frame. At the same time, the common electrolyte pipeline leading to each battery is set outside the stack, which makes it easy to evenly distribute the electrolyte and reduce the size of a single battery. The voltage difference between them improves battery performance.
Description
technical field [0001] The invention relates to the structure of a liquid flow battery, in particular to a way of entering and exiting an electrolyte in an electrode frame in a liquid flow battery. Background technique [0002] Renewable energy, as an indispensable energy component in the sustainable development of modern society, is attracting more and more attention from the governments of various countries, and has introduced powerful policies to encourage the development of renewable energy. In this context, the solar photovoltaic industry and wind power supporting industries have ushered in rapid development, and a large number of solar and wind energy facilities have been put into use. However, renewable energy generally has discontinuity and anti-peaking characteristics, which pose new requirements and challenges for grid connection. Energy storage technology is an effective means to solve this problem. Using energy storage technology as a buffer can effectively impr...
Claims
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IPC IPC(8): H01M8/0273H01M8/18H01M8/2455
CPCH01M8/0273H01M8/188Y02E60/50
Inventor 邢枫张华民李先锋刘涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI