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Meshed ultrathin metal bipolar plate and three-dimensional flow field thereof

An ultra-thin metal, bipolar plate technology, used in fuel cells, electrochemical generators, electrical components, etc., can solve the problem of fuel cells not being able to cool, and achieve the effects of increasing volume power density, reducing thickness, and reducing volume

Active Publication Date: 2019-04-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the rectangular cross-section flow field is assembled in the form of "engagement", the hollow cooling flow field will be closed, causing the fuel cell to be unable to cool.

Method used

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  • Meshed ultrathin metal bipolar plate and three-dimensional flow field thereof
  • Meshed ultrathin metal bipolar plate and three-dimensional flow field thereof
  • Meshed ultrathin metal bipolar plate and three-dimensional flow field thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] An intermeshed ultra-thin metal bipolar plate, including two metal single-stage plates 1, on which there are multiple concave flow channels 2, the flow channels 2 serve as flow field grooves, and the gap between adjacent flow channels 2 The part in between is the flow field ridge, the cross section of the flow channel 2 along the width direction is trapezoidal, and the cross section along the length direction is wave, the flow field grooves and flow field ridges of the two metal single-stage plates 1 alternate, that is, a single pole The portion of the plate flow field groove corresponds to the portion of the other unipolar plate flow field ridge, and the two metal single stage plates mesh at the "troughs" of the "wave". The wave equation is a sine function or a cosine function, in this embodiment it is a sine function.

[0022] Its processing method is as follows:

[0023] Step 1. Use a metal plate with a thickness of 0.1mm as the metal single-stage plate base materia...

example 2

[0033] In this embodiment, the wave-shaped equation is a cosine function.

[0034] Step 1. Use a metal plate with a thickness of 0.1mm as the base material;

[0035] Step 2. The design of the metal bipolar plate flow field is as follows:

[0036] ①The cross-section of the flow channel is trapezoidal and wavy;

[0037] ②The length of the upper bottom of the isosceles trapezoidal section is 0.6mm, and the length of the lower bottom is 1mm, that is, the surface groove width of the flow field plate is 1mm, and the ridge width is 0.6mm; mm, minimum depth 0.2mm;

[0038] Step 3. Design the drawing of the flow field plate opposite to the position of the flow field groove and flow field ridge in step 2;

[0039] Step 4. Based on the designs in steps 2 and 3, process corresponding stamping dies respectively;

[0040] Step 5. respectively use the mold in step 4 to stamp the metal sheet in step 1;

[0041] Step 6. Use the two unipolar plates punched out based on steps 2 and 3, and c...

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Abstract

A meshed ultrathin metal bipolar plate for a fuel cell, comprising two metal monopole plates (1), each metal monopole plate having a plurality of concave flow channels (2). The flow channels are usedas flow field grooves. The parts between adjacent flow channels are a flow field ridges. The cross section of each flow channel in the width direction is trapezoidal, and the cross section of each flow channel along the length direction is wavy. The flow field ridges of each monopole plate is inserted into the flow field grooves of another monopole plate. The two metal monopole plates are meshed with each other at the wavy valleys. The metal bipolar plate is designed to realize the three-dimensional transmission of a fuel gas by the trapezoidal and wavy flow field on the one hand, and realizethe meshed combination of the two metal monopole plates at the valley of the trapezoidal wave flow field on the other hand. The wave peak of the wavy flow field can form a flow field of a coolant in the hollow portion of the bipolar plate. Through the design of the meshed metal bipolar plate, the thickness of the bipolar plate can be further reduced, and the design of the ultrathin metal bipolar plate can be realized while retaining the flow field of the coolant or the cooling gas.

Description

technical field [0001] The invention relates to the technical field of a metal bipolar plate for a proton exchange membrane fuel cell and the design of a flow field, in particular to an engaging metal bipolar plate for a fuel cell and a three-dimensional flow field thereof. Background technique [0002] At present, air pollution has been deteriorating day by day, and environmental issues have been paid more and more attention by the country. In terms of automobiles, many countries in the world have formulated a timetable for traditional fuel vehicles to withdraw from the stage of history, so new energy vehicles have become one of the country's development strategies. Proton exchange membrane fuel cells using hydrogen as fuel can directly convert the chemical energy in hydrogen into electrical energy, and only discharge water in the process. It is a green power generation device utilizing hydrogen energy and can be used as a driving power source for electric vehicles. Intern...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0258H01M8/0265
CPCH01M8/0258H01M8/0265H01M8/0206H01M8/026Y02E60/50
Inventor 王树博谢晓峰
Owner TSINGHUA UNIV
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