Critical Role of Dry Scroll Vacuum Pumps in Lithium Battery Degassing

In the pursuit of higher energy density and longer life cycles, the manufacturing process for lithium-ion batteries has become increasingly sophisticated. One of the most critical stages in ensuring battery safety and performance is degassing. In lithium‑ion battery manufacturing, degassing is critical to ensure cell quality, consistency, safety, and cycle life. Air bubbles in electrode slurry or electrolyte can cause uneven coating, poor infiltration, increased internal resistance, cell swelling, and even short circuits. Oil‑free dry scroll vacuum pumps have become the preferred vacuum equipment for lithium battery degassing due to their 100% oil‑free, clean, stable, low‑vibration, energy‑saving, and low‑maintenance performance.

1.Principle and Key Requirements of Lithium Battery Degassing

1.1 Degassing Principle

Vacuum degassing is based on Boyle’s Law: negative pressure is applied in a closed chamber to expand, rupture, and release dissolved air and micro‑bubbles. Planetary stirring is often used to accelerate bubble removal. The typical process vacuum range is 1–50 mbar, aiming to control bubble diameter below 5 μm and residual oxygen below 50 ppm.

1.2 Core Requirements for Vacuum Pumps

100% oil‑free: No contamination to slurry, electrolyte, or cells.
Stable vacuum: No pulsation, ensuring batch consistency.
Low vibration & low noise: Suitable for precision production lines.
High reliability: For 24/7 continuous production.
Intelligent control: Supports PLC and closed‑loop vacuum regulation.

2.Core Application Scenarios

2.1 Electrode Slurry Vacuum Degassing

Removes micro‑bubbles from positive and negative electrode slurry to ensure uniform coating and high compactness of electrode sheets.

2.2 Pre‑Injection Vacuum Degassing

Evacuates air from battery cells before electrolyte injection to enable fast, full infiltration of electrodes and separators.

2.3 Post‑Injection Vacuum Standing & Infiltration

Maintains stable vacuum to improve electrolyte penetration, cell uniformity, and formation performance.

2.4 Pre‑Sealing Degassing

Eliminates residual gas and solvents to prevent swelling, poor sealing, and leakage after packaging.

3.Technical Advantages of Scroll Vacuum Pumps

100% Oil‑Free & CleanNo oil, no oil mist, no back‑streaming. Zero contamination risk.
Stable Vacuum & Smooth PumpingDelivers stable vacuum in the optimal range for degassing.
Low Vibration & Low NoiseSuitable for precision production lines and cleanrooms.
High Reliability & 24/7 OperationLong service life, minimal wearing parts, low maintenance cost.
Intelligent & Easy IntegrationSupports variable frequency control, PLC communication, and closed‑loop vacuum regulation.

The VPSL Series is a next‑generation, completely oil‑free vacuum solution designed for high‑precision clean applications. It is ideal for lithium battery slurry degassing, electrolyte injection, vacuum infiltration, and packaging degassing.

Core Technical Highlights

Advanced bellows‑sealed isolation structure: Fully separates the compression chamber from the bearing system, enhancing cleanliness and reliability.
100% oil‑free dry operation: Eliminates oil contamination entirely.
Ultra‑quiet & low vibration: ≤53–56 dB(A), vibration<3 mm/s.
Intelligent variable frequency control: Optimizes performance and saves energy.
Air‑cooled, compact design: Easy installation and integration.
Ultra‑low leakage rate:<1×10⁻⁶ mbar∙l/s, ensuring stable vacuum.

Application Adaptability

Slurry degassing: VPSL10/VPSL15 fit small‑ and medium‑sized vacuum mixers.
Electrolyte injection degassing: VPSL15/VPSL36 meet vacuum requirements for batch cell injection.
Vacuum standing / packaging degassing: All models can form a central vacuum system to supply stable negative pressure for multiple stations.

Engineering Application Value

Improve product quality: Deep degassing reduces electrode porosity, enhances electrolyte wetting, and improves cell consistency and cycle life.
Reduce production costs: Oil‑free maintenance, long service life, and low failure rate reduce consumable and downtime losses.
Support automation upgrade: Intelligent control and compact structure enable easy integration into fully automatic production lines.
Ensure production safety: Oil‑free, stable operation reduces risks such as swelling and short circuits.