Stop Crushing Your Battery Cells
When you’re sealing a battery cell, the instinct is to just press harder to get that perfect, airtight seal. But there’s a problem. If you jam a cold cell under too much pressure, you’re basically playing Russian roulette with the internal structure. One wrong move and you’ve crushed the electrode layers. That’s why we use Near-Infrared (NIR) heaters to warm things up first. How it actually works Think of it like this: NIR radiation doesn’t just sit on the surface. It dives right into the polymer sealing materials. By hitting the seal with a quick burst of infrared energy before the press hits, the plastic softens up fast. It hits that “sweet spot” where it’s pliable. Once that happens, you can get a rock-solid, hermetic seal without having to lean on the cell with massive amounts of force. Less pressure. Less stress. Happy batteries. The setup We don’t use those clunky convection ovens. Those take forever because they have to heat all the air in the room first. NIR lamps are different. They heat the part, not the air. It’s fast. Really fast. Plus, you can tune the wavelength. You basically match the light to the specific plastic you’re using. This means the heat stays exactly where it belongs—in the seal—and doesn’t soak into the sensitive chemistry inside the cell. The catch Now, it’s not all magic. High-intensity NIR is powerful. If your conveyor belt lags for a second or the lamp is an inch too close, you’ll burn right through the film. Or worse, you’ll create a hot spot in the cell. To stop that from happening, you can’t just “set it and forget it.” You need a solid PID controller and pyrometers to keep the temperature locked in a very tight window. The bottom line By adding this preheat step, you stop relying on raw mechanical force to get a bond. You let the heat do the heavy lifting. The result? You stop seeing those deformed cells coming off the line, and your scrap rate finally starts to drop.