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Preparation method of bipolar plate for optimizing drainage capacity of fuel cell

A drainage capacity, fuel cell technology, applied to fuel cell components, fuel cells, circuits, etc., can solve problems such as complex processing technology, inability to meet the different requirements of drainage, and difficulty

Inactive Publication Date: 2021-04-30
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that it is difficult to change the bipolar plate structure design and processing
Its disadvantage is that after modification, the hydrophilicity and hydrophobicity of each position of the bipolar plate are the same, which cannot meet the different requirements for drainage in different functional areas.
Its disadvantages are: the former of the above two patents adopts UV irradiation method, and the latter adopts laser treatment + UV irradiation method. The processing technology of these two methods is relatively complicated, and it is prone to uneven treatment, which has certain defects.

Method used

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  • Preparation method of bipolar plate for optimizing drainage capacity of fuel cell

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preparation example Construction

[0020] A method for preparing a bipolar plate that optimizes the drainage capacity of a fuel cell. The bipolar plate is composed of arc grooves and ridges to form a flow channel. The surface of the bipolar plate flow channel is firstly treated to form a hydrophilic layer. The part 3 is subjected to hydrophobic treatment to form a hydrophobic layer, so that the surface of the arc groove part 3 of the bipolar plate is a hydrophobic surface, and the surface of the ridge part 4 is a hydrophilic surface. The method of carrying out the hydrophobic treatment on the arc groove part 3 of the bipolar plate is as follows:

[0021] 1) Combine a bipolar plate 2 with a hydrophilic treatment on the surface of the flow channel and a separator 1 to form a pseudo-galvanic battery. The ridge 4 of the bipolar plate 2 is closely attached to the separator 1, and multiple pieces are assembled in this way The dummy primary cell is assembled into a filled dummy stack, and the separator 1 is a membrane ...

Embodiment 1

[0024] Example 1 is a stainless steel bipolar plate.

[0025] The stainless steel bipolar plate consists of arc grooves and ridges to form a flow channel. The surface of the arc groove part 3 of the stainless steel bipolar plate is a hydrophobic surface, and the surface of the ridge part 4 is a hydrophilic surface.

[0026] The preparation method includes hydrophilic treatment on the surface of the flow channel of the stainless steel bipolar plate and hydrophobic treatment on the arc groove of the bipolar plate. The method of hydrophobic treatment on the arc groove 3 of the bipolar plate is as follows:

[0027] 1) Combine a stainless steel bipolar plate 2 with hydrophilic treatment on the surface of the flow channel and a separator 1 to form a fake primary battery, the ridge 4 of the stainless steel bipolar plate 2 is closely attached to the separator 1, and multiple pieces The pseudo primary cell assembled in this way is assembled into a filled pseudo stack, and the separator...

Embodiment 2

[0030] Embodiment 2 is a graphite bipolar plate, which is also assembled into a filling pseudo-stack with a separator, and the separator 1 is a membrane electrode or a membrane electrode without a catalyst; the hydrophobic agent is a nano-silica superhydrophobic agent. Use the hydrophobic agent to circulate in the hydrogen-oxygen flow field for 5-30 minutes, release the hydrophobic agent from the hydrogen chamber and the air chamber, and then blow the two chambers with compressed air to remove the residual hydrophobic agent; disassemble the filling dummy stack, take out For bipolar plates, dry and cure in an oven at 50-150°C for 10-150 minutes, and the water contact angle at the hydrophobic treatment position can reach 140-150°.

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Abstract

The invention relates to a preparation method of a bipolar plate for optimizing drainage capacity of a fuel cell, the surface of an arc groove part of the bipolar plate is a hydrophobic surface, the surface of a ridge part is a hydrophilic surface, and the preparation method comprises the following steps of: firstly carrying out hydrophilic treatment on the surface of the bipolar plate and then carrying out hydrophobic treatment on the arc groove part of the bipolar plate; the hydrophobic treatment method comprises the following steps: combining the bipolar plate and a partition plate into a pseudo-primary battery, and assembling a plurality of pseudo-primary batteries assembled in this way into a filling pseudo-stack; introducing a water repellent agent into a hydrogen cavity and an air cavity which are assembled into a filling false pile for circulation, then discharging the water repellent agent, and purging the two cavities; disassembling the filling false pile, taking out the bipolar plate, and sintering or curing the bipolar plate. The method has the beneficial effects of improving the corrosion resistance and prolonging the service life of the bipolar plate. The method is simple and low in cost; and the drainage performance is improved, and the consistency of the galvanic pile is improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a bipolar plate for optimizing the drainage capacity of fuel cells and a preparation method thereof. Background technique [0002] In the prior art, regarding the drainage problem of fuel cell bipolar plates, improvements are mainly made around three aspects: [0003] 1. Improvement of bipolar plate structure: such as strengthening convection through 3D flow field, meandering flow field, etc., forming turbulent flow, etc., increasing local flow velocity and improving drainage state. Its disadvantage is: after the bipolar plate structure is designed and processed, it is difficult to change it. [0004] 2. Modify the surface of the bipolar plate, that is, change the drainage state of the bipolar plate by selecting a hydrophilic or hydrophobic coating. Generally, it is processed by PVD, CVD, electroplating and other methods. The disadvantage is that after modificat...

Claims

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Application Information

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IPC IPC(8): H01M8/0228H01M8/026
CPCH01M8/0228H01M8/026Y02E60/50Y02P70/50
Inventor 窦永香李光伟邢丹敏舒清柱宫克楠
Owner SUNRISE POWER CO LTD
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