◆Background

With the gradual application of CTP and CTC batteries, the new energy automobile industry is also gradually developing in the direction of faster charging speed, lighter power batteries and high voltage. According to the data, it is expected that by the end of 2026, the market ownership of high-voltage fast charging models in China will reach more than 13 million. Continuous innovation in structure and materials has resulted in higher demand for battery packaging and insulation materials.

800V high voltage platform - New opportunities for cell insulation!

A large voltage increase greatly increases the probability of arc or insulation breakdown between cells, the consistency of battery system voltage is also facing greater challenges.With the development of a new generation of cell technology, it is giving birth to a new generation of insulation material equipment, technology, materials, cell insulation is gradually developing to the direction of coating solutions with excellent performance and more efficient construction.

◆Cell insulation scheme

◆EHD electrofluid printing technology

Our team started to carry out research on EHD printing technology since 2006, and has developed spot spray, spray line and atomized ultra-thin spraying technology, among which the technical solution for UV blue film spraying can reach a thickness of less than 5 microns, with good spraying uniformity and material viscosity adaptation range of 1-10000cps. The team can provide complete spray solution and process debugging.

EHD electrofluid printing technology uses an externally applied electric field to pull the liquid ink material out, rather than pushing it out of a small nozzle, resulting in patterns with a resolution higher than 1μm. It can replace the mainstream air spraying and inkjet printing processes.

①Drop resolution up to 50fL The droplets produced by EFI printing can achieve the printing resolution at the micron or even nanometer level. ②Adaptive ink1-10000CPS Suitable for a wide range of materials, insulating or conductive liquids, organic and inorganic materials, solutions or suspensions, and liquids with viscosity from 1 to 10,000 mPa·s are suitable for the EFI process. Moreover, the substrate material selectivity is flexible, and the insulating substrate and conductive substrate can be sprayed to form microstructures. ③Good uniformity of atomized film Electrojet printing is a kind of additive manufacturing technology, which not only has the atomization size in micron level, but also has certain advantages in curved structure forming. It has obvious advantages in covering the outer corner of the cell.

EHD-UV spraying line process: loading - laser cleaning - plasma cleaning - spraying and UV curing - coating thickness measurement - insulation test - appearance inspection - blanking

Technical specification