Graphite composite bipolar plate and fuel cell stack

A fuel cell stack and bipolar plate technology, which is applied to fuel cell grouping, fuel cell components, battery electrodes, etc., can solve problems such as infeasibility of battery systems, and achieve convenient implementation, low energy consumption, and improved cooling rate. Effect

Inactive Publication Date: 2016-07-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vacuum removal of water is easy to achieve in the laboratory, but it is not feasible in the battery system

Method used

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  • Graphite composite bipolar plate and fuel cell stack

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The graphite composite bipolar plate is pressed by mixing graphite powder, resin and metal aluminum powder, and the mass content of the metal aluminum powder is 5%. Serpentine flow fields are etched on both sides of the bipolar plate, and the size of the bipolar plate is 7.5cm×5cm.

[0014] The above five bipolar plates and five commercial membrane electrodes (JM) were stacked alternately in sequence, and end plates were assembled at both ends to form a fuel cell stack.

[0015] Stop the above-mentioned fuel cell stack under normal working conditions and transfer it to -20°C for cooling down. When the stack reaches the ambient temperature, test the water content in the membrane electrodes of the stack. According to the test results, the average water content in each membrane electrode is 9mg / cm 2 .

Embodiment 2

[0017] The graphite composite bipolar plate is pressed by mixing graphite powder, resin and metal copper powder, and the mass content of the metal copper powder is 5%. Serpentine flow fields are etched on both sides of the bipolar plate, and the size of the bipolar plate is 7.5cm×5cm.

[0018] The above five bipolar plates and five commercial membrane electrodes (JM) were stacked alternately in sequence, and end plates were assembled at both ends to form a fuel cell stack.

[0019] Stop the above-mentioned fuel cell stack under normal working conditions and transfer it to -10°C for cooling down. When the stack reaches ambient temperature, test the water content in the membrane electrodes of the stack. According to the test results, the average water content in each membrane electrode is 10mg / cm 2 .

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Abstract

The invention discloses a graphite composite bipolar plate, which is prepared by mixing and pressing a graphite material, resin and metal powder into a plate material and then etching flow fields on two lateral surfaces, wherein the metal powder is aluminum or copper; the content of the metal powder in the bipolar plate is 1%-50%, preferably the content of the metal powder in the bipolar plate is 5%-15%; the fuel cell stack with the bipolar plate comprises the bipolar plate, a membrane electrode and end plates; the bipolar plate and the membrane electrode are sequentially and alternately stacked; the end plates are located at two ends of a laminated assembly; and when the stack is stored and started at not lower than -20 DEG C, the water content in the membrane electrode is not higher than 12mg/cm<2>. Compared with the prior art, the graphite composite bipolar plate has the advantages of being low in energy consumption, convenient to implement and the like.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a bipolar plate for a fuel cell stack and a fuel cell stack using the bipolar plate which is suitable for storage and starting in a low-temperature environment. Background technique [0002] When the fuel cell is used outdoors, it will inevitably encounter a low temperature (sub-zero) environment. At low temperature, the water-ice phase transition will cause damage to the MEA. Therefore, controlling the water content of the membrane electrode is the key to solving the low temperature use of the fuel cell. When stored at low temperature, the water content in the battery should be low to avoid damage caused by the water-ice phase transition. When starting at low temperature, the water content should be moderate, which not only ensures that the conductivity of the membrane is not too low, but also prevents the cathode water from freezing too much. Oxygen mass transfer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/96H01M8/24H01M8/02
CPCY02E60/50
Inventor 孙公权姬峰杨林林孙海
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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