PU Machines for EV Battery Potting, Encapsulation & Thermal Management

A complete PU equipment solution for battery pack manufacturing — from cell potting to pack-housing sealing.

Electric-vehicle battery packs rely on several polyurethane (PU) parts for thermal management and protection: cell and module encapsulation foam, potting compounds, thermally conductive gap fillers and pack-housing gaskets. Yongjia builds the high- and low-pressure PU machines that produce these parts. We supply the processing equipment, not the raw material — our machines run with your own or sourced polyol and isocyanate system, so you keep full control of your formulation.

One PU Equipment Line for the Whole Battery Pack

Encapsulation foam, potting compounds, gap fillers and pack-housing gaskets aren’t four separate problems — they’re one PU process that runs from the cell up to the pack housing. Yongjia supplies the equipment line that covers all four steps, so you can plan a single battery-pack PU workflow instead of sourcing machines part by part.

We are an equipment solution provider, not a resin supplier. You keep your own polyether/polyurethane formulation — or bring in whichever system your qualification already covers — and we build the machine around it: metering accuracy, mix ratio and mixing-head design, and output matched to your production volume.

If you haven’t picked machine types yet, start with the part/process/machine table below. If you already have a production line planned, contact us directly for capacity and process-parameter sizing.

EV Battery Potting: What It Is and Why PU

Battery potting means casting a two-component PU (or epoxy) resin around cells or modules to fix them in place while adding electrical insulation, heat transfer and vibration protection. It differs from encapsulation foam: potting compounds are usually low-viscosity, highly thermally-conductive-filled resins poured or metered at low pressure, not foamed — the part stays a solid dense fill rather than a cellular foam.

Parameters buyers plan around:

• Mix ratio — typically 1:1 or 2:1 by volume, run on a precision metering pump.
• Pot life — usually a few minutes up to around 15 minutes once mixed, depending on the resin system.
• Cure time — set by the resin chemistry and any heat-assist; we size the line to your target takt time.
• Viscosity — thermally conductive fillers can push mixed viscosity up to tens of thousands of cps, which needs a dispensing and agitation system built for high-filler-load material rather than a standard low-viscosity gear pump.

Machine fit: our low-pressure PU potting machine uses a metering pump and low-pressure pour, well suited to high-filler-load thermally conductive potting compounds; our high-pressure foaming machine uses impingement mixing for higher output and is the better fit for standard-viscosity potting and encapsulation at volume. We size the metering pump and mixing head to your compound’s viscosity and fill level.

Where PU Fits: Cell, Module and Pack Level

An EV battery is built up from cells into modules into the pack. Polyurethane parts are used at every level — and the same foaming or dispensing platform can cover them:

With cell-to-pack (CTP) and cell-to-chassis (CTC) designs removing the module layer, encapsulation foam, structural foam and sealing become even more important — raising PU demand and the need for reliable dispensing and foaming machines.

Which Machine Produces Each Battery Part

• Cell & module encapsulation / potting foam — poured or injected to fix cells, damp vibration, block moisture and slow thermal propagation. Produced on our low-pressure PU foaming machine or high-pressure foaming machine.
• Thermally conductive gap filler — liquid-dispensed between cells and the cooling plate for efficient heat transfer. Produced on a two-component metering-mixing-dispensing machine.
• Battery pack housing sealing (FIPG) — formed-in-place PU gasket on the pack tray and lid for sealing and ingress protection. Produced on our FIPG PU gasket dispensing machine.
• Structural foam — lightweight rigid PU that adds pack rigidity and holds cells. Produced on our high-pressure foaming machine.

Why Manufacturers Choose PU for These Parts

PU lets a battery maker combine several functions in one poured or dispensed material — thermal management, vibration damping, moisture protection and structure — at low weight and with high automation. Liquid-dispensed PU also wets out rough surfaces better than pre-cut pads, giving closer contact and more consistent heat transfer.

What Our Machines Give You

• Precise two-component metering for consistent ratio, density and thermal performance part to part.
• Self-cleaning mixing head for stable output and low downtime on continuous lines.
• Wear-resistant metering option — thermally conductive gap fillers carry abrasive ceramic or metal fillers, so we can configure wear-resistant pumps and mixing heads to protect the machine and hold accuracy.
• Automation-ready — integrates with robots, jigs and pack conveyors for volume battery production.
• Customizable output — matched to your part size, shot weight and daily volume.

The Same Machines Make Under-Hood Insulation

Our foaming machines also produce molded PU under-hood and engine-bay insulation — the acoustic and thermal foam that cuts cabin noise and protects the hood. One machine platform can serve both your battery and automotive insulation parts by changing the mould and program.

FAQ

Do you supply the polyurethane raw material?

Can your machine dispense abrasive thermally conductive gap fillers?

What pot life and viscosity should I plan for EV battery potting compounds?

High pressure or low pressure for battery potting and encapsulation?

Can one machine make both battery parts and under-hood insulation?

Can Yongjia supply a complete PU equipment solution for battery pack production, or only single machines?

Tell us your battery or automotive PU part and volume — we will propose the right high- or low-pressure machine and quote.