This ion membrane thermal lamination line for flow batteries is specifically designed for the ion membrane-sealing frame assembly of large-capacity energy storage stacks, such as all-vanadium flow batteries and iron-chromium flow batteries.
It integrates five major processes—ion membrane unwinding, precision cutting of hot-melt adhesive film, alignment and bonding of the adhesive frame to the membrane, thermal lamination, and fixed-length cutting—on a single platform, producing the "membrane + adhesive frame" assembly in one go, which can be directly fed into the stack stacking station, completely replacing the inefficient manual processes of manual adhesive coating, manual alignment, and step-by-step hot pressing.
PRODUCT DESCRIPTION
1. Active unwinding of ion membrane: Low-tension servo control, equipped with spreading roller and static eliminator to prevent wrinkling of large-size membrane.
2. Laser/die cutting of hot-melt adhesive film: According to the stack design drawing, the hot-melt adhesive film is cut into a frame shape with flow channel openings (outer frame + internal openings). Laser cutting produces no dust, no burrs, and smooth edges.
3. Automatic waste stripping: The inner-frame waste and outer-frame waste are collected separately through different channels, leaving no residue or adhesion.
4. Alignment and bonding: A vision system identifies the edge or mark points of the ion membrane, and precisely places the cut adhesive frame onto the designated position on the membrane surface (double-sided or single-sided) with an alignment accuracy of ±0.3 mm.
5. Thermal lamination: After passing through a preheating zone, the assembly enters heated rollers with closed-loop control of temperature and pressure, ensuring firm fusion between the adhesive film and the ion membrane and uniform adhesive layer thickness.
6. Fixed-length cutting: The continuous assembly is cut to the preset length to form single membrane-frame components.
7. Automatic stacking: Finished products are neatly stacked on trays, optionally with interleaving paper.
1. Precision cutting of large-size adhesive film: Supports one-step forming of adhesive frames up to 800×1200 mm, cutting flow channel openings, positioning holes, and other details in a single operation without secondary trimming.
2. Low-tension lamination technology: For thick and soft ion membranes, a floating roller buffer + independent tension closed-loop is adopted to avoid stretching or wrinkling of the membrane during hot pressing.
3. Corrosion-resistant process chamber: Areas in contact with the adhesive film and ion membrane are treated with anti-corrosion measures (Teflon coating or 316L stainless steel) to withstand trace corrosive gases released by fluororubber.
4. Quick changeover: The adhesive film cutting die, lamination roller gap, and fixed-length cutting size can be quickly adjusted, supporting small-batch, multi-variety production of stacks with different specifications.
This equipment is a dedicated machine developed for the large-scale manufacturing of flow battery stacks. It solves the process challenges of "precise alignment, uniform lamination, and continuous production" between large-size ion membranes and corrosion-resistant hot-melt adhesive frames, integrating the cumbersome multi-step, multi-operator process into an automated closed loop from "one roll of membrane in, one finished piece out". For flow battery enterprises moving from pilot scale to gigawatt-hour mass production, this equipment is a core tool to improve stack consistency, reduce sealing failure risk, and achieve in-house production of membrane-frame assemblies.
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