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A flow battery bipolar plate with a graded interdigitated flow field

A liquid flow battery and bipolar plate technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of difficult low pressure drop loss and good mass transfer effect, single channel structure, and difficult practical application, etc., to achieve improved Effects of battery voltage efficiency and battery system efficiency, enhanced mass transfer, and reduced pump power loss

Active Publication Date: 2021-08-17
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing single-stage interdigitated flow field design is only for batteries with a small area, and the flow channel structure is single
400cm with traditional interdigitated flow field 2 The pump power loss of a large area flow battery can often reach 40mW cm -2 , the system efficiency is low, and it is difficult to be practically applied
At present, large-area batteries (especially more than 200 square centimeters) have not yet had a reasonable flow field design, and it is difficult to achieve low pressure drop loss and good mass transfer effect at the same time

Method used

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  • A flow battery bipolar plate with a graded interdigitated flow field
  • A flow battery bipolar plate with a graded interdigitated flow field
  • A flow battery bipolar plate with a graded interdigitated flow field

Examples

Experimental program
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Embodiment 1

[0023] Such as figure 1 As shown, this embodiment provides a dual-stage plate for a flow battery with a graded interdigitated flow field. In this embodiment, the thickness of the dual-stage plate 13 is 7 mm, the length is 300 mm, and the width is 180 mm; On one side of the surface of 13, there are respectively provided positive electrode liquid supply ports 1 leading to the electrolyte; Channel 2, the positive electrode liquid supply distribution flow channel 2 has a width of 4mm and a depth of 3mm; the positive electrode liquid supply distribution flow channel 2 is connected to several first-level liquid supply branch flow channels 3, and the width of the positive electrode first-level liquid supply branch flow channel 3 is 3mm, and a depth of 2.5mm; the primary liquid supply branch flow channel 3 is connected to more than two secondary liquid supply branch flow channels 4, and the positive secondary liquid supply branch flow channel 4 has a width of 2mm and a depth of 2mm; ...

Embodiment 2

[0028] This embodiment is the same as Embodiment 1 except that the structural parameters are different from Embodiment 1. Such as figure 2a shows the double-stage plate for flow battery with graded interdigitated flow field provided by the embodiment of the present invention, which has a thickness of 8mm, a length of 160mm, and a width of 160mm. The width of the positive electrode liquid supply distribution channel is 3mm, and the depth The width of the first-stage liquid supply branch flow channel of the positive electrode is 2mm, and the depth is 2.5mm; the width of the second-stage liquid supply branch flow channel of the positive electrode is 1mm, and the depth is 1mm; The width of the first-stage liquid discharge branch flow channel of the positive electrode is 2mm, and the depth is 2.5mm; the width of the second-stage liquid discharge branch flow channel of the positive electrode is 1mm, and the depth is 1mm; The distance between them is 1mm; the design of the negative...

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Abstract

The invention discloses a bipolar plate of a liquid flow battery with a graded interdigitated flow field, which belongs to the technical field of liquid flow batteries. The liquid supply distribution flow channel and the liquid discharge distribution flow channel of the bipolar plate used in the present invention are respectively provided with several branch flow channels, and the final liquid supply branch flow channel and the final liquid discharge branch flow channel are interdigitated. Distributed in a shape and not connected to each other, the electrolyte is forced to be supplied from the final liquid supply branch flow channel to the porous electrode and then collected to the final liquid discharge branch flow channel for discharge. The flow channel of the traditional single-stage interdigitated flow field is narrow and the resistance is large, which causes the flow rate of the electrolyte transported to the porous electrode through the flow channel to be limited by the cross-sectional area of ​​the flow channel. In contrast, the hierarchical fork of the present invention The finger-shaped flow field can flexibly and independently design the geometric structure of each flow channel. While keeping the size of the final flow channel similar to the traditional structure, it increases the cross-sectional area of ​​the flow channels at all levels before the final flow channel, which can further Enhance mass transfer and reduce pump power loss, improve battery voltage efficiency and battery system efficiency.

Description

technical field [0001] The invention belongs to the technical field of liquid flow batteries, and in particular relates to a bipolar plate of a liquid flow battery with a hierarchical interdigitated flow field. Background technique [0002] Flow battery is a large-scale energy storage technology. Because of its good scalability, good safety, long life and high energy efficiency, it has broad application prospects in the fields of absorbing renewable energy, peak shifting and valley filling. In a flow battery, active materials are dissolved in the form of ions in a liquid electrolyte and stored in an external reservoir. When the battery is charging or discharging, the electrolyte is pumped through the pipeline to the electrochemical reaction cell for electrochemical reaction to store or release electrical energy. In the flow battery stack, the main function of the double-stage plate is to transfer electrons and isolate the electrolyte in two adjacent single cells. Usually, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0258H01M8/18
CPCH01M8/0258H01M8/188Y02E60/50
Inventor 袁艳平曾义凯余南阳曹晓玲向波李凤皓
Owner SOUTHWEST JIAOTONG UNIV