Etching Process of Metal Bipolar Plate for Titanium Fuel Cell of New Energy Vehicle

The field of new energy vehicles is formed by the combination of fuel cell stacks, which are the core part of fuel cells. The main components are membrane electrodes, gas diffusion layers, bipolar plates, etc. The metal bipolar plates are an important part of fuel cells, also known as collector plates, which can provide gas flow channels, prevent hydrogen and oxygen in the cell gas chamber from channeling, and establish current channels between the two poles in series, Under the premise of maintaining a certain mechanical strength and good lease term, it can collect conduction current, separate reaction gas, prevent gas from passing through, support battery and cooling, etc. Its existence directly affects the weight and volume of the stack, and also determines that the stack plays an important role in power output and service life. At present, bipolar plates are mainly divided into graphite bipolar plates, composite bipolar plates and metal bipolar plates.

The processing of bipolar plates is mainly based on etching, among which CNC, laser processing and stamping are not suitable to different degrees. The bipolar plate stamping function can seriously damage the material characteristics and cause deformation. The change of the design drawing and the re-opening cost are high. The CNC processing cost is high. The accuracy of some wire grooves cannot meet the requirements, while the laser processing cannot meet the requirements of semi-engraving.

Etched metal bipolar plates have the following advantages:

1. Low mold opening fee, can be changed arbitrarily according to the design of the designer, and the cost is low.

2. It can achieve semi-etching with high precision, up to+/-0.0075mm.

3. For products with complex shape, the arrangement can also be etched without additional cost.

4. There is no burr, pressing point, product deformation, material property change and product function.

5. Thick and thin materials can be processed in the same way to meet the requirements of different assembly components.

6. Almost all metals can be etched, and there is no limit to various pattern designs.

7. Manufacture metal parts that cannot be completed by various mechanical processing.