▼  Industry Background
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Lithium-ion battery manufacturing is a highly continuous precision process industry. From cathode & anode slurry preparation, foil coating, calendering & slitting to electrolyte filling and cell sealing, any deviation in fluid control at each process will be amplified step by step, ultimately affecting cell capacity consistency, internal resistance dispersion and cycle life. New structures and systems including 4680 large cylindrical cells, blade batteries, solid-state and semi-solid-state batteries impose stricter requirements on process precision.

The five core processes — slurry preparation, coating, electrolyte filling, NMP recovery and separator coating — handle various fluids such as slurries, solvents, electrolytes and recovered liquids, covering materials ranging from low-viscosity solvents to high-viscosity slurries. JONSN provides three product lines: MPG (micro precision), MRA/MRB (medium & small flow) and DP (high viscosity), covering all working procedures of lithium battery production lines. Fluid transportation demands of the entire production line can be satisfied with a single pump supplier.

▼  Industry Pain Points
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• High Viscosity & High Solid Content Slurries Cannot Be Handled by Ordinary Pumps Cathode slurries (NCM/LFP + PVDF + NMP + conductive agent) generally have a viscosity of 3,000~15,000 mPa·s and solid content of 50%~70%; anode slurries (graphite + CMC/SBR + water) range from 2,000 to 8,000 mPa·s. Diaphragm pumps suffer from insufficient suction lift and severe flow pulsation under high-viscosity conditions. Although screw pumps can transport slurries, their rubber stators are prone to swelling by NMP or abrasion from solid particles, resulting in frequent stator replacement.

• Feeding Pulsation Equals Coating Weight Fluctuation Equals Cell Capacity Deviation Extrusion coating and transfer coating require pulsation-free and constant slurry delivery to the die head. A ±1% fluctuation in feed flow directly leads to a ±1% deviation in electrode coating weight. After accumulation from winding or stacking multiple electrodes, it causes batch capacity dispersion of ±3%~5%. This serves as a critical control point in lithium battery manufacturing: slight pumping instability will greatly affect cell consistency.

• Electrolyte Filling: PPM-level Moisture Sensitivity & Corrosion Risk Electrolytes (LiPF₆ + carbonate solvent) are extremely sensitive to moisture. Moisture exposure above the ppm level triggers HF formation and capacity degradation, so filling pumps must operate under fully sealed conditions. In addition, LiPF₆ decomposes into HF upon contact with trace water, posing continuous corrosion risks to conventional metal pump bodies. The required filling accuracy is within ±0.5%. Under-filling results in insufficient capacity, while over-filling leads to excessive gas generation during formation.

• NMP Recovery System: High Temperature & Severe Solvent Attack NMP vapor evaporated during coating is condensed, recovered and pumped back for reuse, with recovered liquid temperature often reaching 60~80°C. NMP can strongly dissolve and swell most engineering plastics (PC, ABS, ordinary nylon) and seriously erode rubber seals. Conventional pumps feature extremely short seal service life under such working conditions. Leakage not only wastes expensive solvent but also causes excessive VOC levels in the workshop.

▼  JONSN Solution: Five-stage process, fully integrated production line
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▎Stage 1 ▸ Cathode/Anode Slurry Transfer
The DP series high-viscosity gear metering pumps (0.2–100 cc/r) are specifically designed for medium-to-high viscosity slurries. A high-strength gear set combined with precise internal clearances ensures stable transfer of both cathode slurries (8,000–15,000 mPa·s) and anode slurries (2,000–8,000 mPa·s). The positive displacement principle ensures flow rates remain unaffected by batch-to-batch viscosity fluctuations; optional DLC-coated gears enhance wear resistance against abrasive conductive agents (carbon black/CNT).

• DP series (0.2–100 cc/r) covers applications ranging from laboratory-scale slurry mixing to production-line feeding.

• DLC-coated gears resist abrasion from carbon black/CNT particles, offering a service life 2–3 times longer than standard gear pumps.

• PEEK static seals are chemically inert to NMP, ensuring no swelling or leakage.

▎Stage 2 ▸ Coating Feed Supply
The final pumping stage—transferring slurry from the storage tank to the coating die—is the critical control point for determining areal density. The MRA series (100–2,000 ml/min) and MRB series (400–4,800 ml/min) micro-gear pumps deliver a pulsation-free, positive-displacement output, eliminating the reciprocating pulses associated with diaphragm pumps; flow fluctuation is < ±0.5%, and coating areal density achieves a Cpk ≥ 1.67. Integrated with a closed-loop servo motor speed control, coating speed and feed flow can be programmed in tandem, ensuring consistent areal density from the leading edge to the trailing edge during wide-format coating (~1,000 mm).

• Continuous, pulsation-free flow with areal density fluctuations < ±0.5%; significantly reduced batch-to-batch variation in cell capacity.

• Optional 316L pump heads for aqueous slurries and PEEK pump heads for NMP-based systems.

▎Step 3 ▸ Electrolyte Filling
MPG series microliter-class gear pumps (40 μl/r, 1–280 ml/min) perform precision single-cell electrolyte filling within gloveboxes or dry rooms. A fully magnetic seal combined with an all-PEEK/ceramic flow path ensures zero leakage and zero metal leaching throughout the process, preventing moisture or metal ion contamination of the electrolyte. A repeatability of ±0.2% ensures consistent filling volumes across cells, significantly improving the pass rate for cell capacity grading.

• 40 μl/r displacement; ±0.2% filling precision (surpassing the industry baseline of ±0.5%).

• Fully inert PEEK and ceramic flow path; resistant to LiPF₆/carbonate mixtures; zero metal ion contamination.

• Fully magnetic, hermetically sealed design; zero leakage and zero moisture ingress within glovebox environments.

▎Step 4 ▸ NMP Recovery and Recycling
Condensed NMP (60–80°C) is pumped back to solvent storage tanks or directly reused in the slurry mixing stage using MRB/MRC series magnetic gear pumps (0.4–14 L/min). The all-PEEK pump body and PTFE/PFFE seals resist swelling and softening during prolonged exposure to high-temperature NMP—a critical performance requirement for NMP recovery systems that causes most engineering plastics to fail. A fully magnetic seal eliminates VOC emissions from the recovery piping. 

• PEEK components resist swelling in high-temperature NMP and withstand continuous delivery of 80°C recovery fluid.

• Fully magnetic drive design ensures zero VOC leakage, meeting workshop environmental compliance standards.

▎Stage 5 ▸ Separator Coating
Ceramic separator coating (Al₂O₃/Boehmite + PVDF + NMP) and PVDF coating demand extremely high coating uniformity; deviations in coating area density directly impact the separator's thermal shrinkage and ionic conductivity uniformity. MPG and MRA series gear pumps provide pulsation-free, constant-flow feeding, with positive-displacement flow synchronized to the coating line speed, achieving a coating thickness Cpk ≥ 1.67.

• MPG (pilot lines) and MRA (mass production lines) cover the entire lifecycle from R&D to mass production.

• Pulsation-free coating supply ensures batch-to-batch consistency in separator thermal shrinkage.

▼  Quick Product Selection Guide
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▼  Core Values
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▎Comprehensive coverage across all five production line stages from a single supplier
JONSN supplies pumps for every stage of the lithium-ion battery production line: DP series for high-viscosity slurry transfer; MRA/MRB for precise flow control in coating; MPG for micro-dosing in electrolyte filling; MRB/MRC for high-temperature solvent handling in NMP recovery; and MPG/MRA for uniform separator coating. This enables one-stop management of procurement, inventory, and maintenance.

▎Pulsation-free positive displacement: Consistency starts with the pump
Pulsation-free coating supply ensures consistent areal density and capacity, preventing the "bottleneck effect" in battery modules. Electrolyte filling precision of ±0.2% ensures equal electrolyte volume per cell, consistent gas generation during formation, and higher pass rates in capacity grading. The pulsation-free nature of gear pumps provides the physical foundation for manufacturing consistency.

▎Material matrix precisely matched to chemical environments
Specific material combinations are selected for each process: PEEK pump heads for NMP systems; 316L for water-based systems; fully inert PEEK/ceramic components for electrolytes; and DLC-coated gears for highly abrasive slurries. We do not use a "one-size-fits-all" approach but rather match the optimal material configuration to each specific process step.

▎Zero moisture, zero leakage, zero contamination
Fully magnetic hermetic sealing for electrolyte filling in gloveboxes; fully enclosed systems for NMP recovery with zero VOC emissions; and drip-free slurry transfer that maintains workshop cleanliness. Full magnetic sealing is the fundamental safeguard for both cleanliness and safety on lithium-ion battery production lines.

▎Seamless scale-up from pilot to mass production
Flow rates scale linearly across the range: MPG (1–280 ml/min) for pilot sampling → MRA (100–2000 ml/min) for pilot testing → MRB (400–4800 ml/min) for mass production. With consistent pump types, operating principles, and control systems, process parameters can be transferred directly from the laboratory to the production line.

▎20,000 hours of maintenance-free operation, matching 24/7 production cycles
Lithium-ion battery production lines operate over 8,000 hours annually, leaving extremely limited windows for pump maintenance. The wear resistance of the zirconia ceramic gear shaft is more than five times that of standard bushings; the 20,000-hour maintenance-free lifespan equates to approximately 2.5 years of continuous production without intervention—ensuring no negative impact on the production line's OEE.