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Method and device for forming half-mold of metal flow field plate of mini-type fuel cell in laser shock mode

A micro fuel cell, laser shock technology, applied in battery electrodes, laser welding equipment, metal processing equipment, etc., can solve the problems of low flow channel processing efficiency, difficult to control process parameters, and inability to exceed the strain rate, and achieve laser focusing. and regional selectivity, the method is simple and practical, and the effect of ensuring sustainability and reproducibility

Inactive Publication Date: 2014-07-16
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent 1787261A proposes "a stamped metal bipolar plate structure and its preparation method", which uses a milling machine to process the flow channel, and then stamps the metal bipolar plate. The processing efficiency of the flow channel is low, and it is not suitable for the processing of micro flow channels.
[0008] The currently reported research and patents on micro-volume forming are aimed at the conventional loading mode and plastic deformation mode, and the dynamic high-pressure loading mode and plastic deformation theory under the state of ultra-high strain rate (≥106) are not involved. Explosive forming is also used. A high strain rate can be obtained, but the process parameters are difficult to control, the safety is poor, and the strain rate cannot exceed 106

Method used

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  • Method and device for forming half-mold of metal flow field plate of mini-type fuel cell in laser shock mode
  • Method and device for forming half-mold of metal flow field plate of mini-type fuel cell in laser shock mode
  • Method and device for forming half-mold of metal flow field plate of mini-type fuel cell in laser shock mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The flow channel of the target metal flow field plate 28 is a serpentine flow channel 30 with a semicircular cross section.

[0041] First, according to the pre-designed cross-sectional shape of the flow channel of the metal flow field plate 28, the template 22 is processed by LIGA; a semicircular track with the same shape and size as the serpentine flow channel 30 on the metal flow field plate 28 is processed on the template 22 23, such as figure 2 shown.

[0042] Secondly, stainless steel with a thickness of 1.2 cm×1.2 cm and a thickness of 100 μm is selected as the base material 10 for manufacturing the metal flow field plate 28 . The workbench 12 for adjustable positioning is placed on the base 21; the support seat 11 is fixed on the workbench 12 for adjustable positioning with connecting screws 20, and the template 22, the base material 10, the constraining layer 9, and the energy absorbing layer 8 are Place it on the supporting base 11 in turn from bottom to to...

Embodiment 2

[0045] The flow channel of the target metal flow field plate 28 is a serpentine flow channel 30 , and the cross section of the flow channel is trapezoidal.

[0046] First, according to the pre-designed cross-sectional shape of the flow channel of the metal flow field plate 28, the template 22 is processed by etching; ,Such as image 3 shown. Stainless steel with a thickness of 1.2 cm×1.2 cm and a thickness of 100 μm is selected as the base material 10 for manufacturing the metal flow field plate 28 . The processing process is the same as that of Example 1, and finally a metal flow field plate 28 with a serpentine flow channel 30 and a trapezoidal cross section is obtained.

[0047] It should be noted that the base material 10 can also be a plate with a thickness in the range of 40-1200 μm and made of stainless steel, titanium alloy, or aluminum alloy.

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Abstract

The invention provides a method and device for forming a half-mold of a metal flow field plate of a mini-type fuel cell in a laser shock mode. The method comprises the steps that according to the designed shape and the designed size of a flow channel of the metal flow field plate, a template provided with a groove with the same shape and the same size is machined, and a motion path of laser beams is well planned according to the shape and the size of the flow channel; a control system controls the motion direction, the path and the machining speed of the laser beams according to a track and a whole flow field is formed through accumulation of plastic forming. The device for forming the half-mold comprises a workbench base, a blank pressing device, the control system and a forming system. According to the method and device, the snake-shaped metal flow field plate can be formed, machining is simple, accuracy and efficiency are high, cost is low, and popularization and application of the metal flow field plate of the fuel cell and a mini-type PEMFC are facilitated.

Description

technical field [0001] The invention relates to the field of micro-fuel cell technology and the field of laser micromachining, in particular to a method and device for forming a metal flow field plate of a micro-fuel cell by laser impacting half molds. Background technique [0002] The demand for modern industrial energy has risen sharply, and the harmful substances released during the combustion of fossil fuels are causing the continuous deterioration of the ecological environment. The research and development of green energy is very urgent. A fuel cell is a power generation device that isothermally and directly converts chemical energy stored in fuel and oxidant into electrical energy in an efficient and environmentally friendly manner. Proton exchange membrane fuel cell (PEMFC) can start quickly at room temperature, has no electrolyte loss, easy water discharge, long life, high specific power and specific energy, and has broad application prospects. [0003] The composit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/00B23K26/18B23K26/70B21D26/06H01M4/88
CPCB21D26/06
Inventor 王匀许桢英朱金鑫薛远杜金星薛小峰
Owner JIANGSU UNIV
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