Vacuum electrolyte filling is a critical step in battery fabrication, ensuring the porous electrodes and separators are fully "wetted." Without a vacuum, air pockets (dry spots) remain, leading to poor capacity, high internal resistance, and shortened cycle life.
For pouch cells, the machine often combines injection, vacuum standing, and sealing into one unit or a modular glovebox line. The cell is typically pre-sealed on three sides. Electrolyte is injected into the open side, and the cell is placed in a vacuum chamber. The vacuum pulls air out of the pouch, and when the vacuum is released, the external atmospheric pressure "pushes" the electrolyte into the electrode pores. The key features are: (1) Vacuum Standing: A chamber where the cell sits under vacuum to allow for degassing and diffusion. (2) Vacuum Sealing Specialized heat-sealing bars that operate inside the vacuum chamber to close the final side of the pouch.
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| Power |
- AC110V or 220V±10%, single phase, 50/60Hz, 1400 W
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Electrolyte Filling Features
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- Pouch Cell Sizes: Max. L370*W360*T12 mm
- Pouch Sealing Blade Length:390 mm (effective sealing length is 380 mm)
- Pouch Sealing Width: 2-10 mm (standard value is 6 mm)
- Pouch Sealing Thickness (tab area): 0-0.5 mm
- Heat Sealing Temperature: Max. 220℃ (±3℃)
- Sealing Pressure: Max. 70 kgf (~0.6 MPa). The pneumatic force can be supplied by gas pressure from an Ar gas tank in glovebox or gas compressor in dryroom .
- Sealing Time: 0-99 s (5-6 s is recommended)
- Vacuum Pressure: Max. -95 kPa (adjustable)
- High precision peristaltic pump is used for electrolyte transfer and filling. Accuracy: 5 g (±1.5%); 50 g (±1%); 100 g (±0.8%).
- Electrolyte Filling Time: ~2-3 min (50g electrolyte as an example)
- Electrolyte Filling Needle: PTFE, O.D. 3mm, I.D. 2mm
- Electrolyte Transfer Tubing: BPT, O.D. 6.4 mm, I.D. 3.2 mm
- Peristaltic Pump Tubing: soft BPT, O.D. 5mm, I.D. 3 mm
- Electrolyte Buffer Tank: 150 mL (inside is PTFE layer)
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| Glovebox Operation Compatibility |
- The KF40 feedthrough with gas/vacuum tubing and power cable is included to connect the outside vacuum pump and gas pressure tank.
- The electrolyte filling machine is glovebox compatible.
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| Vacuum Pump (Optional) |
- A vacuum pump (EDSRVVP) is required to provide high vacuum for standing and sealing.
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| Gas Pressure Source (Optional) |
- For the vacuum electrolyte filling machine placed inside glovebox, an Ar gas tank (60-80 psi) is required to connect with electrolyte filling machine through KF40 feedthrough.
- When the electrolyte filling machine is placed inside a dryroom, then a gas compressor (EUQOFGC) can be considered.
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| Certificate |
- CE certified
- UL and CAS certification can be supplied upon request with additional cost.
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References:
T. Knoche, et al., In situ visualization of the electrolyte solvent filling process by neutron radiography, J. Power Sources, 2016, 331, 267-276
F. J. Günter, et al., Influence of the Cell Format on the Electrolyte Filling Process of Lithium-Ion Cells, Energy Technology, 2020, 8, 1801108.
H. Cui, et al., Operando monitoring of the open circuit voltage during electrolyte filling ensures high performance of lithium-ion batteries, Nano Energy, 2022, 104, 107874.
