High-precision line application of liquid gasket to EV battery pack sealing parts

In the battery structure of an EV (electric vehicle), the mating surface between the cover and tray is an important joint that requires waterproof, dustproof, and vibration-resistant performance. Applying a liquid gasket to this joint ensures airtightness, but this poses the following challenges:

• Variation in coating width and thickness
  When applying the sealant manually or using simple devices, it is difficult to maintain a consistent track width and height, resulting in uneven sealing.
• Defects caused by stringiness and dripping
  Highly viscous liquid sealants tend to become stringy after application, and there have been cases where the liquid spills out of the adhesive line before solidifying.
• Increased man-hours for corrections and rework
  In areas where the film was too thin or where the line was broken, frequent reapplication and repairs were required, reducing productivity.

The introduction of the vipro-PUMP series (large capacity type) into the EV battery pack sealing process has resulted in the following benefits:

• Achieves uniform line width and film thickness with ±1% high-precision, quantitative coating
  Rotating volumetric dispenser ensures consistency without being affected by viscosity or temperatureConstantly stable flow controlThis is difficult to do manually or with simple devices.Formation of uniform coating tracksThis has resulted in improved reliability of the sealing section.
• Reduces stringiness and dripping, reducing product defects
  High response and liquid cut-off of discharge control,The start and end points of application are beautifully finished.With thatEliminates pooling and overflow at the gasket edgeThere was no variation in the seal width, and product yield improved significantly.
• Reduced remediation and increased productivity
  Previously, this was a frequent occurrence.Almost no need for reapplication or repairsThis reduces the burden on workers. The coating process is becoming more automated and standardized.Improving productivity across the entire linecontributed to.
• Stable application for long periods of time even on high viscosity and filler-containing materials
  It also supports ultra-high viscosities up to 2,000,000 mPa・s.Stable and continuous long-term discharge even with filler-containing and abrasive liquidsEven large workpieces such as EV battery packs can be machined with this technology.Uninterrupted, tightly sealed application linesforms.