Metal bipolar plate gas expansion forming device and process based on pulse current assistance

Abstract

The invention discloses a metal bipolar plate gas expansion forming device and process based on pulse current assistance. The device comprises an upper module (1) and a lower module (7). An upper die fixing seat (3) is mounted on the lower surface of the upper die set (1) through an insulating bolt (13), and the upper die fixing seat (3) is separated from the lower surface of the upper die set (1) through an upper insulating base plate (2); an upper female die containing cavity (22) is formed in the middle of the lower surface of the upper die fixing base (3), assembling steps (23) are arranged on the two sides of the upper female die containing cavity (22), and an upper female die (4) is arranged in the upper female die containing cavity (22). The metal bipolar plate is formed through the gas expansion pressure provided by the high-pressure inert gas and the pulse current auxiliary synchronous action, collision of a stamping rigid die and the harsh requirement for die assembly precision are avoided, the metal bipolar plate is prevented from being oxidized during hot forming, the rebound amount is reduced, two bipolar plates can be formed through single inflation and deflation circulation, and the production efficiency is improved. And the production efficiency of the metal bipolar plate is effectively improved.

Description

technical field [0001] The invention relates to the technical field of bipolar plate forming, in particular to an inflatable forming device and process for a metal bipolar plate based on pulse current assistance. Background technique [0002] The bipolar plate is a very critical multifunctional component of the fuel cell. Its main functions are to conduct current, separate the redox agent, divert the reaction gas, discharge the reaction heat and water, etc., and account for 80% of the weight and cost of the entire fuel cell. 30%. The matrix material needs to have the characteristics of high strength, good compactness, and good electrical and thermal conductivity. The thin metal bipolar plate has excellent mechanical properties and electrical and thermal conductivity, which can enable the stack to have a higher volume specific power density, and it can be mass-produced at low cost. It is the best choice for passenger car fuel cells. However, the precision forming process an...

AI Technical Summary

Problems solved by technology

The bipolar plate liquid expansion forming process does not require a punch, which avoids the problems of mold collision and mold clamping precision control, but the liquid expansion forming needs to drain the liquid medium during unloading, resulting in low efficiency, and this process can only be carried out at room temperature. Material cannot be heated

[0004] Conventional methods such as conventional radiant heat heat the metal billet, the temperature rise is slow, the heating area is not concentrated, and the heat loss is large, which is an important reason for the high energy consumption and low efficiency of the existing process

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