A device and method for forming titanium alloy bipolar plate based on multi-sequence pulse current

Abstract

The invention belongs to the technical field of manufacturing of metal bipolar plates for fuel cells, and particularly relates to a fuel cell titanium alloy bipolar plate electromagnetic-thermal composite forming device and method based on multi-time-sequence pulse current. A power module of the device comprises a plurality of sets of pulse power sources, the pulse power sources discharge a titanium alloy blank and a Helmholtz coil according to the time sequence, preheat the titanium alloy blank, generate pulse current in the titanium alloy blank, generate a pulse magnetic field in the Helmholtz coil, generate pulse electromagnetic force under the combined action of the pulse current and the pulse magnetic field, and drive the titanium alloy blank to rush to a mold, and forming of a titanium alloy bipolar plate is achieved. Through multi-level time sequence pulse current discharging, the plasticity and forming performance of titanium alloy are greatly improved through the thermal effect of the titanium alloy at high temperature, the electro-plastic effect of the pulse current and the high strain rate effect of the pulse electromagnetic force, and high-quality forming of the titanium alloy bipolar plate is achieved.

Description

technical field [0001] The invention belongs to the technical field of manufacturing metal bipolar plates for fuel cells, in particular, it relates to an electromagnetic-thermal composite forming device and method for titanium alloy bipolar plates in fuel cells, and more specifically, it relates to a multi-sequence pulse current-based An electromagnetic-thermal composite forming device and method for a fuel cell titanium alloy bipolar plate. Background technique [0002] The proton exchange membrane fuel cell (hydrogen fuel cell) using hydrogen as raw material has the advantages of high power density, high power generation efficiency, and less environmental pollution. It has become an ideal power source in the fields of aerospace, electric vehicles, and power generation. It is of great strategic significance to promote my country's new energy and green development. As an important part of the hydrogen fuel cell, the bipolar plate accounts for more than 70% of the weight of t...

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Problems solved by technology

[0007] Aiming at the defects of the prior art, the object of the present invention is to provide a fuel cell titanium alloy bipolar plate electromagnetic-thermal composite forming device and method based on multi-sequence pulse current, aiming to solve the problems existing in the existing titanium alloy bipolar plate forming process. The depth of the bipolar plate flow channel is insufficient, the flow channel is torn, the forming quality is not high, the cost rises due to the use of the drive plate or the addition of soft film, the heating time of superplastic forming or thermoforming is too long, the processing efficiency is low, and the device structure Technical issues such as complexity, difficulty in assembly, etc.

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