Moisture and floating dust particles in the air have the greatest impact on lithium battery materials in lithium battery production, among which moisture has the greatest impact and harm. In the manufacturing process of lithium battery, once the raw materials are entered by moisture in the air, it will affect the safety of lithium battery, and generally cause bulging and even explosion of lithium battery; The floating soil and dust in the atmospheric environment will cause the short circuit of lithium battery. Therefore, the production of lithium batteries will be carried out in the dust-free workshop.
From the technical process level, the most important thing of lithium battery dust-free workshop is environmental control, among which the most important are "relative humidity" and "cleanliness control".
Lithium battery dust-free workshop is generally class C workshop. How to arrange the 1000, 10000 and 100000 level sections to meet the functional requirements and save energy is a profound knowledge. Here, ceidi Xidi has a small point to reveal: the cleanliness level of two connected workshops should not exceed two orders of magnitude.
It is also a dust-free workshop. The biggest difference between the clean room of the lithium battery dust-free workshop and that of other industries is that it has high requirements for humidity control in the production environment (the temperature requires low dew point). Therefore, when selecting and configuring ceidi Xidi air conditioner, it not only considers that the supply and return air systems are equipped with primary, medium and high-efficiency filters to continuously circulate and filter the indoor ambient air, To ensure that the air suspended particles are controlled to a certain concentration, the air conditioning unit also has a dehumidification section. The dehumidification air conditioning unit is the key equipment to reduce the environmental dew point. At present, in the production and manufacturing process of lithium batteries, it is difficult to control and stabilize the dew point temperature within the range of - 35 ℃ to - 40 ℃ required by the clean room air between lithium battery production plants.
Moreover, there must be production personnel for production, and the long production line of the battery industry will lead to a large number of staff working on the battery production line. At this time, the production personnel must emit more moisture than usual. This part of moisture will leak out from the clean clothes. Therefore, this part of moisture must be purged in time, Therefore, the performance requirements of dehumidification units will be higher: generally, the battery industry must choose units with good stability (continuous operation) and large dehumidification capacity. It is best to produce gas in the dew point range of - 50 ℃ ~ - 60 ℃ (accurately controlled) to continuously purge the clean room, so that the humidity, temperature and cleanliness can meet the production requirements.
Considering the safety and economy of raw materials and production, ceidi generally recommends that the humidity control ladder of lithium battery production workshop is: workshop with relative humidity ≤ 30% (such as mixing, coating head, tail, etc.); Workshop with relative humidity ≤ 20% (such as rolling, film making, baking, etc.); Workshops with relative humidity ≤ 10% (such as lamination, winding, assembly, etc.) and dew point temperature ≤ 45 ℃ (such as cell baking, liquid injection, sealing, etc.). There will be some differences in specific humidity control, which should be operated according to the actual situation of each battery enterprise. At the same time, the dehumidification cycle operation also needs to control the residence time of the process. To maintain the standard production environment of lithium battery dust-free workshop, other internal technical systems need to be implemented as appropriate.
Floor: 3mm epoxy resin self leveling floor in clean area and non clean area, positive and negative electrode mixing workshop and positive and negative electrode bearing room can adopt 3mm stainless steel floor. The wall adopts manual rock wool color steel plate (class a fireproof material, color steel plate thickness 0.476mm * 50mm), the ceiling color steel plate adopts manual glass magnesium hollow color steel plate (class a fireproof material, color steel plate thickness 0.476mm * 50mm, bearing 100kg / m2), the door body adopts formed steel purification door, and the glass window adopts tempered glass.
Electrical lighting system
LED lamps are used for lighting in the purification workshop, with illuminance requirements of 250-300lx, and relevant power failure emergency lighting panels are configured. Wires and conduits are made of fireproof and flame retardant materials.
Process piping system
U-PVC pipes can be used for vacuum pipes and pure water pipes, aluminum alloy pipes can be used for nitrogen pipes, and galvanized steel pipes and stainless steel pipes can be used for air compression pipes.
Air conditioning and ventilation system
The refrigeration host and dehumidification unit can be provided by Party A, and the general air conditioning terminal equipment adopts air conditioning box and fan coil. Angle iron flange can be used for air duct, and B1 grade fireproof and flame retardant insulation cotton shall be used for insulation.
Pressure difference control
To prevent external pollution sources from entering the lithium battery workshop? The air pressure in the workshop must be controlled within a reasonable range. Ceidi Xidi should generally control the pressure difference between the connected workshops at 0.03-0.05.
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