Lithium battery projects require the use of oil-free compressors, mainly because they can provide absolutely oil-free pure air to meet the stringent requirements of lithium battery production for air quality, equipment safety, process stability and environmental protection and energy conservation, as follows:
1. air quality requirements: zero oil pollution is the core bottom line
lithium battery production of air cleanliness requirements comparable to the semiconductor industry, especially the electrolyte, positive and negative materials and other key components of the oil is extremely sensitive:
- electrolyte protection: The quality of the electrolyte directly affects the performance and life of the battery. If the compressed air contains oil, the oil mist may be mixed into the electrolyte, causing lithium salt decomposition, short circuit in the battery or cycle life degradation. Oil-free compressor through water lubrication technology or oil-free design, from the root to eliminate oil pollution, to ensure the purity of the electrolyte.
- Pole piece manufacturing precision: In the electrode coating, rolling and other processes, oil may adhere to the surface of the pole piece, forming a micron oil film, causing short circuit or capacity attenuation in the battery. The oil-free compressor is equipped with a precision filtration system (filtration accuracy of 0.01 μm), which can intercept oil and metal impurities and ensure the quality of the pole piece.
- Injection and Encapsulation Environment: The liquid injection stage shall be carried out in a drying room or glove box, and the air dew point shall be lower than -40 ℃. Oil-free compressor with dryer, can provide ultra-dry air (water content <0.001 g/m & sup3;), to avoid the injection chamber condensation, while eliminating lubricating oil vapor pollution.
2. equipment safety and process stability: reducing production risk
lithium battery production environment for safety and stability requirements are very high, oil-free compressor through the following ways to provide protection:
- eliminate fire and explosion risks: The oil mist generated by the traditional oil compressor may accumulate inside the equipment, which may cause fire or explosion in case of high temperature or electric spark. Oil-free compressors eliminate oil pollution from the design level and meet the access standards of top customers such as Ningde Times and BYD.
- Stable process parameters: Oil-free compressor exhaust temperature stability (such as single screw water lubrication host compression technology, exhaust temperature fluctuations <± 2 ℃), to avoid temperature fluctuations caused by coating viscosity changes or battery material performance fluctuations, to ensure process consistency.
- Support for continuous production the failure rate of oil-free compressor is 60% lower than that of oil-free compressor, which can support continuous operation for 7 × 24 hours, reduce production interruption caused by equipment shutdown, and improve overall efficiency.
3. environmental protection and energy saving: in line with the trend of sustainable development
as an important part of the new energy field, the lithium battery industry has increasingly stringent requirements for environmental protection and energy conservation:
- zero oil emissions: The oil-free compressor does not need to use lubricating oil, avoids the pollution of oil mist emission to the environment, meets the requirements of ESG audit, and helps enterprises realize green production.
- energy saving and consumption reduction: The oil-free compressor adopts permanent magnet frequency conversion technology or high-efficiency centrifugal design, and the energy saving rate can reach more than 30%. For 24 hours uninterrupted production of lithium factory, a year to save electricity is very considerable.
- Reduce maintenance costs: The oil-free compressor does not need to replace the oil filter, oil and gas separation core and other consumables, and the burden of post-processing equipment is small, which reduces downtime and maintenance costs.
