Flow battery flow channel with bifurcated finger-type structure on bipolar plate

A technology of flow battery and bipolar plate, which is applied to fuel cells, fuel cell components, circuits, etc., can solve the problems of poor electrolyte uniformity, increased pressure drop and pump consumption, and inability to distribute electrolyte, etc. Achieve the effect of improving mass transfer effect, reducing pump power loss, battery voltage efficiency and system efficiency improvement

Pending Publication Date: 2022-07-29
THE HONG KONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the power of the battery increases, the area of ​​the active region also increases, which leads to a rapid increase in the number of branch channels.
For the traditional interdigitated flow channel, the liquid separation method that flows in from the side of the main channel and enters the branch channels in turn cannot evenly distribute the electrolyte to each branch cha

Method used

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  • Flow battery flow channel with bifurcated finger-type structure on bipolar plate
  • Flow battery flow channel with bifurcated finger-type structure on bipolar plate
  • Flow battery flow channel with bifurcated finger-type structure on bipolar plate

Examples

Experimental program
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Effect test

Embodiment 1

[0029] like figure 1 As shown, this embodiment provides a flow battery flow channel with a bifurcated finger structure on a bipolar plate, and the electrolyte is evenly distributed to the branch channels in the active area in a bifurcated manner, so as to improve the active material The uniformity of distribution reduces mass transfer losses, reduces pressure drop and pump consumption. Both sides of the bipolar plate 16 are the positive and negative electrodes of the flow battery, one side of the bipolar plate 16 is the negative electrode side, the other side of the bipolar plate 16 is the positive electrode side, and the flow battery flow channels on both sides of the bipolar plate 16 The structures are identical and centrosymmetric.

[0030] Taking the negative side as an example, the flow path of the flow battery includes:

[0031] The negative electrode liquid inlet 1, the negative electrode liquid inlet distribution channel connected with the negative electrode liquid i...

Embodiment 2

[0042] Since the use of bifurcated finger-type flow channels greatly reduces the system pressure drop, narrower branch flow channels and wider flow channel spacing are used for the battery to expand the convection area in the electrode and improve the electrochemical performance. This example is the same as Example 1 except that the parameters of the liquid inlet branch channel and the liquid outlet branch channel are different from those of Example 1.

[0043] like Figure 4 As shown, this embodiment has a bipolar plate for a flow battery with a bifurcated finger-type flow channel with a narrow flow channel. The parameters of the liquid inlet, the liquid outlet, the multi-stage liquid inlet distribution channel, and the multi-stage liquid outlet collection channel parameters are all the same as those in Example 1. There are eight final-stage liquid inlet distribution channels in total, and each final-stage liquid inlet distribution channel is still connected with four liquid...

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Abstract

The invention relates to the technical field of flow batteries, in particular to a flow battery flow channel with a bifurcated finger-type structure on a bipolar plate. Electrolyte is evenly distributed to the liquid inlet flow channels of all the subunits of the flow channel step by step from an inlet in a step-by-step two-way mode, and the electrolyte of the liquid outlet flow channels is collected to an outlet step by step in the step-by-step two-way mode. The liquid inlet branch flow channels and the liquid outlet branch flow channels are alternately arranged and distributed in an interdigital manner and are not communicated with one another, so that electrolyte is forced to enter the porous electrode from the liquid inlet branch flow channels and then flow into the liquid outlet branch flow channels to be discharged. According to the two-branch finger-type flow channel, the electrolyte is uniformly distributed in each branch flow channel, so that on one hand, the uniformity of active substance supply is ensured, on the other hand, the pressure drop and the pump work loss are reduced, the sealing performance of a system is ensured, the flow of the electrolyte can be further improved, the mass transfer loss is further reduced, and the service life of the system is prolonged. And the battery voltage efficiency and the system efficiency are improved. The invention is suitable for flow batteries with different sizes, and the larger the size of the battery is, the more obvious the effect is.

Description

technical field [0001] The invention relates to the technical field of liquid flow batteries, in particular to a flow channel of a liquid flow battery with a bifurcated finger structure on a bipolar plate. Background technique [0002] In recent years, with the gradual depletion of fossil energy and the gradual deterioration of the ecological environment, vigorously developing new energy technologies represented by wind energy and solar energy has become an inevitable choice for sustainable social development. However, the acquisition of wind energy and solar energy is unstable, and direct integration into the power grid will seriously affect the safe and stable operation of the power grid. Large-scale energy storage systems can effectively solve the problem of new energy power generation and reduce the impact on the power grid. [0003] Flow batteries have the characteristics of good scalability, high efficiency, high safety, and long life, and have good application prospe...

Claims

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Application Information

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IPC IPC(8): H01M8/0202H01M8/0263
CPCH01M8/0202H01M8/0263
Inventor 赵天寿郭子啸范新庄
Owner THE HONG KONG UNIV OF SCI & TECH
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