Super-plasticity diffusion connecting clamp and technology for metal bipolar plate

Abstract

The invention relates to a clamp and technology for connecting metal unipolar plates made of materials with superplasticity performance into a bipolar plate in a diffusion manner. The clamp is composed of an upper pressing plate, a lower pressing plate, bolts and nuts. The technology for conducting super-plasticity connection on the bipolar plate through the clamp comprises the steps that firstly, the two metal unipolar plates are arranged between the upper pressing plate and the lower pressing plate, and the part, to be connected, of the metal bipolar plate is pressed through the upper pressing plate and the lower pressing plate via the fastening nuts; secondly, the clamp and the two metal unipolar plates which are fixed are put into a vacuum heating furnace, heat preservation is conducted for a certain time under the diffusion connection temperature, and the two metal unipolar plates are connected into one metal bipolar plate; and thirdly, the clamp and the metal bipolar plate are taken out of the vacuum heating furnace and cooled until the temperature in the furnace is lower than 50 DEG C, then the nuts are demounted, and the bipolar plate is taken out. According to the technology the metal bipolar plate made of the materials with the superplasticity performance is connected in the one-time heating and pressing process, the connector quality is high, and a connecting area is flat.

Description

1. Technical field [0001] The invention relates to the technical field of metal unipolar plate connection, in particular to a metal bipolar plate superplastic diffusion connection fixture and process. 2. Background technology [0002] Proton exchange membrane fuel cell is a clean energy technology that directly converts hydrogen energy into electrical energy. It has the advantages of high energy conversion efficiency, simple structure, low emission, and low noise. It can be widely used in vehicle power, mobile power and communication base stations areas such as backup power. Bipolar plates are again important components that distribute fuel and oxidant within cells, connect individual cells in stacks in series, collect current, and support membrane electrodes. The bipolar plate is the core component of the fuel cell, which accounts for most of the weight and cost of the battery stack, and its production materials and processing costs are one of the main reasons for the high...

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Problems solved by technology

The above inventions all adopt the laser welding method. In the actual welding process, there will be welding through and virtual welding. The current welding pass rate is only 70%.

In addition, with laser welding, the energy conversion efficiency is very low, usually less than 10%

[0006] After searching again, the State Intellectual Property Office of China published the publication number CN102049601A on May 11, 2011, and the name is "current-assisted fuel cell ultra-thin metal bipolar plate pressure welding device and method thereof"; the invention provides a A current-assisted pressure welding device and method for ultra-thin metal bipolar plates of fuel cells adopts direct current heating and pressure welding, which has high thermal efficiency and simple welding process, but the precision of the technology is not high in the welding process

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