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A bipolar plate and electrode frame integrated structure and its preparation method and application

A technology of electrode frames and bipolar plates, applied in electrochemical generators, circuits, fuel cells, etc., can solve the problems of inability to further increase carbon content, low conductivity of bipolar plates, thinning electrodes and increasing electric density, etc., to achieve Good liquid blocking effect, reduced electrode thickness, and excellent mechanical properties

Active Publication Date: 2022-02-11
DALIAN RONGKE POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If insulating substances are involved in the spraying raw materials, a certain proportion of conductive solution is mixed into the materials to make the insulating substances conductive; however, the conductivity of the bipolar plate is low, and the existing extrusion process cannot further increase the carbon content, and the thickness of the electrodes increases. Secret

Method used

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  • A bipolar plate and electrode frame integrated structure and its preparation method and application
  • A bipolar plate and electrode frame integrated structure and its preparation method and application
  • A bipolar plate and electrode frame integrated structure and its preparation method and application

Examples

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Embodiment 1

[0028] Select a polyethylene sheet with a thickness of 5.0mm and cut it into a size of 200×300mm, set up the electrolyte flow channel or reserve the electrolyte flow channel area at the edge of 300mm, cut out the middle area to form a groove with a depth of 2.0mm, and then use The groove extends to the outermost end of one of the 200mm sides with the same depth and 50mm width, and the two surfaces of the plastic sheet are treated with the same symmetry. Coat the rough surface of the substrate with a layer of conductive solution mixed with 1000-mesh graphite powder and butyl lactate at a volume ratio of 20:80; use an electrostatic spraying process to spray a layer of 0.3mm thick carbon material coating on the surface of the substrate, The sprayed carbon material is a mixture obtained by mixing microcrystalline graphite and conductive carbon black at a mass ratio of 1:1, so as to obtain the integrated prefabricated plate of the bipolar plate and the electrode frame; the integrate...

Embodiment 2

[0030] The difference between this embodiment and embodiment 1 is that the material of the substrate is polypropylene, and the conductive solution is prepared by mixing 1000 mesh graphite powder and acetone, wherein the volume ratio of graphite powder and acetone is 20:80.

Embodiment 3

[0032] The difference between this embodiment and embodiment 1 is that the material of the substrate is polypropylene, and the conductive solution is prepared by mixing 1000 mesh graphite powder and acetone, wherein the volume ratio of graphite powder and acetone is 10:90.

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Abstract

The invention belongs to the field of liquid flow batteries, and discloses an integrated structure of a bipolar plate and an electrode frame, a preparation method and an application thereof. Including: selecting plastic sheet to cut into the size of electrode frame, making substrate, roughing the bottom of the groove, coating a layer of conductive solution to form a conductive liquid film on the surface of the substrate; spraying a certain thickness of carbon material coating by electrostatic spraying , to make a bipolar plate and electrode frame integrated prefabricated plate, put it in a vacuum drying oven to dry to constant weight, place it on a hot press and press it, so that the carbon material coating and the plastic plate are tightly and firmly combined. After cooling, the The carbon material coating at the extension port of the groove on both sides of the plate is connected with a conductive material, that is, an integrated structure of the bipolar plate and the electrode frame with high electrical conductivity and strong mechanical properties is obtained. The invention has good liquid blocking effect, reduces electrode thickness and reduces electrode internal resistance.

Description

technical field [0001] The invention belongs to the field of liquid flow batteries, and relates to an integrated structure of a bipolar plate and an electrode frame, a preparation method and an application thereof. Background technique [0002] The bipolar plate is the key component of connecting fuel cell single cells in series to form a cell stack. Its function is to separate the reaction gas and introduce the fuel reaction gas into the fuel cell through the flow field, collect and conduct current and support the membrane electrode. The heat dissipation function and drainage function of the entire battery system. In the prior art, widely used materials for manufacturing bipolar plates are graphite and metal plates. The metal bipolar plate has the advantages of high electrical conductivity, good mechanical strength, and low price. It can process the gas flow field and cooling water flow field by stamping, and can be processed into a thin plate to reduce the thickness and w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0228H01M8/0213H01M8/0221H01M8/18
CPCH01M8/0213H01M8/0228H01M8/0221H01M8/188Y02E60/50
Inventor 梁加富张华民李全龙王杰王良汪平
Owner DALIAN RONGKE POWER