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Flow cell ion exchange membrane assembly, preparing method of flow cell ion exchange membrane assembly and flow cell comprising flow cell ion exchange membrane assembly

A technology of ion exchange membrane and flow battery, which is applied in the field of flow battery, can solve problems such as sealing failure, achieve the effect of avoiding sealing failure, reducing processing cost and assembly difficulty

Inactive Publication Date: 2015-12-09
中国东方电气集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention provides a flow battery ion exchange membrane assembly, its preparation method and a flow battery including the same, so as to solve the need to embed sealing rings on the flow frames on both sides of the ion exchange membrane in the prior art Or add a sealing gasket for sealing and the sealing failure caused by the swelling and deformation of the ion exchange membrane

Method used

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  • Flow cell ion exchange membrane assembly, preparing method of flow cell ion exchange membrane assembly and flow cell comprising flow cell ion exchange membrane assembly
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Embodiment approach

[0034] According to a typical embodiment of the present invention, the porous membrane is an organic porous membrane, such as polytetrafluoroethylene, polyvinylidene fluoride, polysulfone, polyimide, polypropylene, polyethylene, polyaryletherketone, or polyether Porous membranes made of sulfone and other materials. The porous membrane provides a supporting framework for the integrated ion-exchange membrane module, so that the ion-exchange tree area coating and the sealing coating are combined into one. At the same time, the porous membrane framework also plays a role of mechanical reinforcement, which can reduce the amount of coating resin. Thereby reducing production costs. The porous membrane has an upper surface, a lower surface and a plurality of penetrating holes, such as figure 2 As shown, the ion exchange zone coating 41 is formed by coating the ion exchange resin in the hole in the middle region of the porous membrane, the upper surface and / or the lower surface; the ...

Embodiment 1

[0052] Raw materials: PTFE (polytetrafluoroethylene) porous membrane with a thickness of 50mm and a pore diameter of 0.1-0.3mm is used as the organic porous membrane matrix, 10wt% PTFE emulsion is used as the sealing resin solution, and 5wt% Nafion (perfluorosulfonic acid) solution It is an ion exchange resin solution, and 0.5% surfactant TritonX-100 (polyethylene glycol octyl phenyl ether) is added to the Nafion solution.

[0053] Implementation process: first soak the PTFE porous membrane in isopropanol for 30 minutes, then take it out and let it dry naturally. Clamp the pretreated PTFE porous membrane on the jig, evenly brush the PTFE emulsion on the upper and lower sides of the porous membrane in the sealing area, then put it in an oven, heat-treat at 120°C for 30 minutes to remove the solvent, and then heat up to 300°C Heat treatment at ℃ for 20min to make it solidify, take it out after cooling. Clamp the PTFE porous membrane coated with the sealing material to a specifi...

Embodiment 2

[0055] Raw materials: Polyimide porous membrane with a thickness of 30mm and a pore diameter of 0.2-0.5mm is used as the organic porous membrane matrix, fluororubber is used as the sealing material, and sulfonated polyether ether ketone is used as the ion exchange resin.

[0056] Implementation process: First, add 2% crosslinking agent benzoyl peroxide to fluorine rubber raw rubber, use a double-roller mixer for mixing, and then dissolve the mixed rubber in ethyl acetate to obtain 10% fluorine rubber Rubber glue. Clamp the polyimide porous membrane on the fixture, evenly brush the fluororubber glue on the upper and lower sides of the porous membrane in the sealing area, then perform one-stage vulcanization at 160°C, and then heat up to 250°C for two-stage vulcanization. Remove after cooling. Clamp the polyimide porous membrane coated with the fluororubber sealing material in a specific fixture, and evenly coat the Nafion solution on the upper and lower sides of the porous mem...

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Abstract

The invention discloses a flow cell ion exchange membrane assembly, a preparing method of the flow cell ion exchange membrane assembly and a flow cell comprising the flow cell ion exchange membrane assembly. The flow cell ion exchange membrane assembly comprises a porous membrane, an iron exchange area coating arranged in the middle area of the porous membrane, and a sealing area coating arranged in the area, outside the ion exchange area coating, of the porous membrane. The preparing method includes the following steps that firstly, the porous membrane serves as the base material, the middle area of the porous membrane is coated with the ion exchange area coating; secondly, the area, outside the ion exchange area coating, of the porous membrane is coated with the sealing area coating. By means of the technical scheme, due to the existence of a sealing area, sealing rings or sealing gaskets do not need to be embedded or added to liquid flow frames on the two sides of the flow cell ion exchange membrane assembly when a cell stack is assembled, the processing cost and the assembling difficulty of cells are lowered, and meanwhile the problem of the sealing failure caused by water absorption swelling of the iron exchange membrane in conventional design can also be solved.

Description

technical field [0001] The invention relates to the technical field of flow batteries, in particular to an ion-exchange membrane assembly of a flow battery, a preparation method thereof, and a flow battery comprising the same. Background technique [0002] Flow battery is a new type of electrochemical energy storage system. Compared with other energy storage technologies, flow battery has the advantages of large power, large capacity, high energy conversion efficiency, long service life, high safety, and environmental protection. Large-scale energy storage systems supporting photovoltaic power generation and wind power generation, smart grid peak regulation, communication base stations, and distributed power sources have broad application prospects. The all-vanadium redox flow battery is a kind of flow battery. It uses vanadium ion electrolytes in different valence states as the positive and negative active materials of the battery, and the positive pole is V 4+ / V 5+ Elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/18
CPCH01M8/0239H01M8/0245H01M8/0276H01M8/188Y02E60/50
Inventor 高艳刘红丽王政刘煜
Owner 中国东方电气集团有限公司
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