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Tube Sealer: The "Sealing Protection Expert" for New Energy Battery Soft Packs
Views: 478 Author: Site Editor Publish Time: 2025-11-07 Origin: Site
Tube Sealer: The "Sealing Protection Expert" for New Energy Battery Soft Packs
In the field of new energy battery production, the Tube Sealer is a core equipment to ensure the sealing and safety of soft-pack batteries. It uses "precision temperature control + gradient pressure" technology to melt and bond the battery aluminum-plastic film packaging layer (PP layer), forming a leak-proof and anti-aging sealing structure. It effectively isolates air and moisture, avoiding leakage of electrolyte inside the battery or bulging due to moisture. Widely used in the top sealing and side sealing of soft-pack batteries such as ternary lithium batteries and lithium iron phosphate batteries, a single equipment can complete 2000-3000 battery packages per hour, and the sealing qualification rate is stable above 99.9%, providing key support for battery cycle life and safety performance.
Operating the Tube Sealer must follow the principle of "material adaptation + dynamic parameter adjustment". When packaging conventional aluminum-plastic film, the heat-sealing temperature is set to 180℃-200℃, and the pressure is adjusted in two stages (pre-pressure 0.3MPa/1s, main pressure 0.5MPa/3s) to ensure uniform bonding of the sealing surface; when processing ultra-thin aluminum-plastic film (thickness < 80μm), the temperature is reduced to 160℃-180℃, and a flexible pressure head is used to reduce pressure impact and prevent film damage; when packaging the tab area, it is necessary to accurately align the heat-sealing mold with the tab position, and increase the local temperature by 5℃-10℃ to strengthen the bonding strength between the tab and the aluminum-plastic film. Before production, helium leak test must be performed to test the sealing performance (leakage rate < 1×10⁻⁸ Pa·m³/s), and mass production can only be carried out after reaching the standard.
Daily maintenance should focus on "mold precision" and "system stability". After each shift change, wipe the heat-sealing mold with a dust-free cloth dipped in isopropanol to remove residual PP melt and prevent mold fouling from affecting sealing flatness; check the mold flatness every week, and perform grinding and calibration if the flatness error exceeds 0.02mm; calibrate the pressure sensor and temperature controller every month to ensure the parameter error is controlled within ±1℃ and ±0.02MPa; disassemble and clean the air circuit system of the Tube Sealer every quarter to remove impurity blockages and ensure a stable pressure process. In addition, the mold coating (such as Teflon coating) should be checked regularly and re-coated in time after wear to avoid aluminum-plastic film adhering to the mold.
Compared with traditional ultrasonic welding, the Tube Sealer has the advantages of strong sealing consistency, adaptability to various aluminum-plastic film materials, and no high-frequency noise pollution. It also supports linkage with automated production lines to realize unmanned full-process battery packaging. With the improvement of the new energy vehicle industry's requirements for battery energy density and safety, Tube Sealers with intelligent temperature control, pressure closed-loop control, and automatic defect detection functions have become core equipment for battery manufacturers to improve production capacity and quality.
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