Plasmatreat and Venjakob revolutionize battery production

Coating Special coating replaces complex foiling in battery cells

2024-07-19 Source: Press release | Translated by AI 2 min Reading Time

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Plasmatreat and Venjakob Mechanical Engineering have developed a process that makes battery production more efficient and reliable. Instead of a complex foil coating, the battery cells receive a special coating.

Through pressurized air and electricity, the surfaces of the batteries are reliably cleaned of ultra-thin layers of dust as well as residual traces from the production process, such as oils or fats, so that the protective varnish can be applied seamlessly and a long-lasting adhesion is achieved.(Image: Plasmatreat) — Through pressurized air and electricity, the surfaces of the batteries are reliably cleaned of ultra-thin layers of dust as well as residual traces from the production process, such as oils or fats, so that the protective varnish can be applied seamlessly and a long-lasting adhesion is achieved.
(Image: Plasmatreat)

To make batteries more reliable and safer, the e-mobility sector is looking for solutions. One approach is to optimize the electrical insulation. Conventionally, battery cells, especially prismatic cells, are coated with a foil. The process is costly and time-consuming and has potential sources of error. A new method is designed to make battery production more efficient, faster, and more reliable: the battery cells are coated with a special varnish instead of the foil. For this, the companies Plasmatreat and Venjakob have combined their skills.

Gallery

View into the spray painting cabin of the battery cell coating line.(Image: Venjakob)

Venjakob has developed a fully automatic system for a continuous, contactless coating process.(Image: Venjakob)

Perfect paint adhesion through fine cleaning

Plasmatreat has developed the Openair-Plasma technology. In this case, it is used for the fine cleaning of the bare battery cell and allows for a reliable, long-term stable paint application. The Openair-Plasma is applied to the metal surface of the battery cells in a Plasma Treatment Unit (PTU) at atmospheric pressure using simple compressed air and electricity through specially developed nozzles. The process is significantly more environmentally friendly, selective, and in-line capable compared to conventional cleaning methods. The surfaces of the battery cells are reliably cleaned of thin layers of dust and residual traces from the production process, such as oils or fats. This allows the protective paint to be applied seamlessly. Long-term adhesion is achieved.

Contactless coating, minimize sources of error

The mechanical engineering company Venjakob has developed a fully automatic system for a continuous, contactless coating process. Here, after fine cleaning by Openair-Plasma, the battery cells in various formats are coated with a 100 percent UV varnish. A specially developed tool carrier ensures that sensitive areas and the electrical poles of the battery cells are safely protected from overspray. Since the process does not require gripping, turning, or further handling, the risk of damage to the battery cells is minimized. The non-contact process also allows for an increased production speed. As the UV varnish hardens immediately, the cells can be processed directly. This speeds up the entire battery manufacturing process.

Various analyses confirm the high effectiveness of the insulating coating, which reaches adhesion strength values of over 15 MPa in tensile shear tests.

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