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Forming method of electromagnetic driving flexible-mould for fuel cell metal bipolar plate

A metal bipolar plate and fuel cell technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems such as difficulty in coordination, cost of driving plates that cannot be reused, etc., to increase the selection range, improve the forming limit, and improve flexibility Effect

Active Publication Date: 2013-07-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an electromagnetic force-driven soft mold forming method for metal bipolar plates of fuel cells, so as to solve the problem of difficult cooperation between convex and concave molds when forming fine features on metal sheets based on conventional plastic deformation means such as stamping forming. At the same time, it solves the problem of cost increase caused by the non-reusable use of the driving piece when the metal bipolar plate is formed by purely using electromagnetic force

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  • Forming method of electromagnetic driving flexible-mould for fuel cell metal bipolar plate
  • Forming method of electromagnetic driving flexible-mould for fuel cell metal bipolar plate
  • Forming method of electromagnetic driving flexible-mould for fuel cell metal bipolar plate

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specific Embodiment approach 1

[0015] Specific implementation mode one: combine figure 1 with figure 2 Explain, the electromagnetic force driving soft mold forming device of the fuel cell metal bipolar plate in this embodiment, the device includes a lower fixed plate 1, a forming mold 2, a soft mold 4, a driving plate 9, a coil 8, a support frame 7, an upper Fixed plate 6, capacitor bank C, power supply 11, discharge control switch K and multiple fastening bolts 5;

[0016] The lower fixing plate 1 is stacked with forming mold 2, soft mold 4, driving plate 9, support frame 7 and upper fixing plate 6 from bottom to top; the lower end surface of support frame 7 is provided with groove 7-1, and the groove 7-1 is provided with a coil 8. The coil 8 is composed of a single wire wound from the inside to the outside for multiple turns. The adjacent two turns of the wire are separated by a high-voltage insulating material. The surface of 8 is potted with high-voltage and high-strength insulating material to form ...

specific Embodiment approach 2

[0017] Embodiment 2: The cross-sectional shape of a single wire in this embodiment is rectangular. Such a design is beneficial to improve the energy conversion efficiency compared with the circular cross-section wire. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0018] Specific implementation mode three: combination figure 1 To illustrate, the driving board 9 of this embodiment is a red copper board. With such a design, the copper plate has high conductivity, which is conducive to generating high-amplitude eddy currents on its surface, and generating high-intensity magnetic fields in the gap between the drive plate 9 and the coil 8, so that the drive plate 9 is subjected to a larger amplitude pulse magnetic field force, The forming efficiency of the slab 3 is improved by the soft mold 4 acting on the slab 3 . Others are the same as in the first embodiment.

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Abstract

The invention relates to a method for forming a fuel cell metal bipolar plate. The invention aims at the problems of a conventional plastic deformation means (such as a punching forming means) for forming a metal sheet that a raised mould and a concave mould are difficult to match with each other and a driving sheet cannot be reused in a process of electromagnetically forming a metal bipolar plate. The device is characterized in that a forming mould, a flexible mould, a driving plate, a support frame and an upper fixing plate are stacked on a lower fixing plate from bottom to top, wherein a coil is arranged in a groove on a lower end face of the support frame; two adjacent circles of leads are separated by high-pressure isolating material; high-pressure high-strength isolating materials are filled between the groove and the coil and on the surface of the coil, thereby forming a flat coil; two ends of the coil are serially connected to a capacitor bank; and the upper fixing plate and the lower fixing plate are fixedly connected through a fastening bolt. The method comprises the following steps: placing a plate blank on the forming mould and fastening the upper fixing plate and the lower fixing plate; and performing discharging forming; and taking out a formed piece, thereby acquiring the metal bipolar plate. The device and the method provided by the invention are used for forming the fuel cell metal bipolar plate.

Description

technical field [0001] The invention relates to a method for forming a metal bipolar plate of a fuel cell. Background technique [0002] With its high efficiency and cleanliness, fuel cells meet the requirements of sustainable development. It can be used not only as a fixed power station, but also as a power source for mobile vehicles. It is considered to be one of the most competitive power sources to replace automobile power. one. In addition to the general characteristics of fuel cells, proton exchange membrane fuel cells also have outstanding features such as rapid and frequent start-up in greenhouses, no electrolyte loss, easy water discharge, long life, and high specific power and specific energy. Proton exchange membrane fuel cell is mainly composed of three parts: porous gas diffusion electrode, proton exchange membrane and bipolar plate. Among them, bipolar plates account for 60-80% of the total weight of the entire fuel cell stack and 30-45% of the cost of the st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88B21D26/14
CPCY02E60/50
Inventor 于海平李春峰王蕾
Owner HARBIN INST OF TECH
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