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Fuel cell bipolar plate, manufacturing method and used equipment thereof

A fuel cell and bipolar plate technology, which is applied to fuel cells, circuits, electrical components, etc., can solve the problems of long time consumption, excessive time, and low efficiency, and achieve the effects of increasing contact area, good electrical conductivity, and increasing adhesion.

Inactive Publication Date: 2020-02-21
SHENZHEN CENT POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphite material / resin composite plates usually use traditional machining methods to process flow channels, which takes a long time, cannot be produced continuously, and has low efficiency. All of these lead to high processing costs of bipolar plates, even exceeding Material costs

Method used

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  • Fuel cell bipolar plate, manufacturing method and used equipment thereof

Examples

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Effect test

preparation example Construction

[0030] refer to figure 1 , the first embodiment of the present invention provides a method for preparing a fuel cell bipolar plate, comprising the following steps:

[0031] (1) Mixing the graphite material and the resin binder evenly to obtain a mixed slurry;

[0032] (2) coating the mixed slurry on a metal foil, pressing to obtain a pre-pressed plate, and then molding the pre-pressed plate to obtain a molded plate, at least one side of the molded plate has a flow channel;

[0033] (3) separating the molded plate from the mold to obtain a molded bipolar plate;

[0034] (4) Solidifying and cooling the formed bipolar plate to obtain the fuel cell bipolar plate.

[0035] The preparation method provided by the embodiment of the present invention fully ensures that the graphite material and the resin binder are mixed evenly through a reasonable graphite material / resin slurry ratio, and fully mixes the resin binder evenly in the three-dimensional network structure of the graphite ...

Embodiment 1

[0056]In this embodiment, the continuous production of fuel cell bipolar plates is realized by adopting the manufacturing process of coating the metal foil surface with roll press molding. The specific steps are as follows:

[0057] 1) First mix the expanded graphite and the resin binder in a mass ratio of 1:1, and stir evenly in a mixer to form a mixed slurry;

[0058] 2) Set the copper foil between the active steel roller and the active silica gel roller of the coating machine, so that the mixed slurry is evenly coated on the copper foil;

[0059] 3) Copper foil with mixed slurry is rolled by a roller press to make a thickness of 4mm and a density of 0.6g / cm 3 the pre-pressed plate;

[0060] 4) The pre-pressed plate in step 3) is molded again through a molding machine under the condition of a pressure of 80MPa and a temperature of 300°C to make a thickness of 3.0mm and a density of 0.5g / cm 3 , and molded plates with corresponding runners on both sides;

[0061] 5) Separa...

Embodiment 2

[0064] In this embodiment, the continuous production of fuel cell bipolar plates is realized by adopting the manufacturing process of coating the metal foil surface with roll press molding. The specific steps are as follows:

[0065] 1) First mix the expanded graphite and the resin binder in a mass ratio of 1:1, and stir evenly in a mixer to form a mixed slurry;

[0066] 2) Set the copper foil between the active steel roller and the active silica gel roller of the coating machine, so that the mixed slurry is evenly coated on the copper foil;

[0067] 3) Copper foil with mixed slurry is rolled by a roller press to make a thickness of 3.5mm and a density of 0.7g / cm 3 the pre-pressed plate;

[0068] 4) The pre-pressed plate in step 3) is molded again through a molding machine under the condition of a pressure of 60MPa and a temperature of 300°C to make a thickness of 2.0mm and a density of 1.0g / cm 3 , and molded plates with corresponding runners on both sides;

[0069] 5) Sep...

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Abstract

The invention provides a fuel cell bipolar plate, a manufacturing method and used equipment thereof. The manufacturing method comprises the following steps of uniformly mixing a graphite material anda resin adhesive material to obtain a mixed slurry; coating a metal foil with the mixed slurry, pressing to obtain a pre-pressing plate, and carrying out mold pressing on the pre-pressing plate to obtain a mold pressing plate, wherein at least one surface of the mold pressing plate is provided with a runner; separating the mold pressing plate from a mold to obtain a formed bipolar plate; and curing and cooling the formed bipolar plate to obtain the fuel cell bipolar plate. The manufacturing method is efficient, cost is low and continuous production can be realized.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell bipolar plate, a preparation method and equipment used therefor. Background technique [0002] A proton exchange membrane fuel cell (PEMFC) reacts fuel (hydrogen) with oxygen in the air to directly convert chemical energy into electrical energy. When the fuel cell is working normally, the internal fuel, oxidant and cooling liquid must be effectively separated by the bipolar plate, and be effectively distributed in the anode, cathode and cooling liquid chambers respectively depending on the flow channel structure. The role of the bipolar plate is not only to introduce the reactant gas into the catalytic layer and conduct the current generated by the reaction, but also to undertake the heat dissipation and drainage functions of the entire battery. Therefore, the quality of the bipolar plate will directly determine the performance and service life of the fuel cell st...

Claims

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Application Information

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IPC IPC(8): H01M8/0234H01M8/0239H01M8/0243
CPCH01M8/0234H01M8/0239H01M8/0243Y02E60/50Y02P70/50
Inventor 张植茂张华农高鹏然
Owner SHENZHEN CENT POWER TECH
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