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800V high voltage platform - New opportunities for cell insulation!
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Electric arc between the core, insulation breakdown problem | Battery insulation coating |
In order to ensure electrical safety, the battery cell has always needed PET "blue film" to wrap, the so-called "blue film", is a single side tape made of PSA pressure sensitive adhesive on the back of PET substrate, because such products are mostly dark blue, so it is referred to as "blue film", its dielectric strength, chemical resistance and mechanical strength is excellent. It is the most mainstream solution for power battery electrical insulation and physical protection applications, in addition to other ways, powder coating, UV coating and so on. |
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Mainstream cell insulation solution -- PET "Blue film" |
| Problems faced by the current insulation scheme:① The bonding performance of the "blue film" coating process is too weak, and vibration and shock under different environments will pose a great threat to the safety of the battery.② The spraying process causes a lot of material waste, on the other hand, it is necessary to build additional spraying workshops.③ The uniformity of the spraying process is poor, cannot ensure the consistency and stability of the coating. |
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
EHD-UV spraying technical parameters | |
| Full line beat | ≤1.2s/piece |
Spray film thickness | 110μm（±10μm |
Insulativity | 2660-2740V voltage, current within 3 seconds＜0.1mA |
Product yield | ≥98% |
| Material utilization | ≥85% |
Related product link: https://www.nanofiberlabs.com/product/electrohydrodynamic-inkjet-printing-machine.html
