Cleanroom Solutions for Li-ion Batteries

Lithium Battery Manufacturing Modular Cleanroom

1. High cleanliness - ISO4/5
   2. Constant temp and low RH
                    3. Super high, large span L＞8M,H＞6M
        4. Fast installation ＜7d(100m²ï¼‰

• Lithium batteries have the most stringent requirements for the production environment since temperature, humidity and air cleanliness have significant impacts on the consistency, safety and life cycle of finished batteries.

• The partial production process requires the temperature to be controlled at ≤-45℃ (dew point), and the clean class to be ISO5 or higher.

• AIRKEY FastIns Modular Cleanroom LIGHT series are widely applied in dozens of production lines such as coating and roller separation in many lithium battery factories.

• AIRKEY-LIGHT series clean rooms keep safe and stable parameters, enjoy exquisite and bright appearance, feature with green and pollution-free site installation, providing critical assistance to countless lithium battery companies for quickly ramping up capacity with flexible and efficient cleanroom solutions.

Lithium Battery Modular Cleanroom Structure:

Super high, large span L＞8M,H＞6M
â‘  FFU-900
â‘¡ Double-sided laminated tempered glass
â‘¢ Aluminum frame
â‘£ Diffuser
⑤ Auto double sliding door
â‘¥ Swing double door
⑦ Intelligent control panel
⑧ Fast Roll-up door

Lithium Battery Modular Cleanroom Characteristics:

1.Safe and Stable Parameter Control
A. High efficiency large airflow EC FFU
B. Intelligent control system, real-time alarm, remote and central control (control panel)
C. Online monitoring of cleanliness, DP, Temp, RH.

2.Elegant and Bright Appearance
A. High-strength 6063 patented aluminum profile, 3.0mm thick seamless structure, electrophoresis surface, easy to clean.
B. Intelligent and quiet fast rolling door/sliding door, with AGV.
C. PVB safety glass or acrylic wall, transparent and bright.
D. Patented connection structure without any exposed screws or fixtures, beautiful and free from dust accumulation.

Green and Pollution-free Installation
A. Modular design, intelligent production, high-precision CNC processing, 100% factory prefabrication.
B. Patented modular structure, flexible and fast; adapting to complex site conditions by avoiding interference with pipelines or existing equipment and supporting cross-operation during installation.
C. No construction wastes, pollution-free after installation.

The production of lithium batteries involves multiple steps including: 
Raw material preparation 
Electrode Coating 
Calendaring and Cutting 
Lamination/Winding 
Placing the cell into the shell and Injecting Electrolyte 
Formation and Capacity Grading 
Battery Packaging and Sealing 
Leak Testing -  Aging and Testing. 
Through strict control and testing in battery clean rooms, the performance and safety of the batteries are ensured.

Coating Cleanroom 
  The Coating Cleanroom for lithium battery production refers to the environment used to coat the positive and negative electrode materials of the battery during the production process of lithium batteries. It requires extremely low dust and pollutants in the air to ensure the coating quality. The coating process requires high-precision operation, and any tiny impurities will affect the performance and safety of the battery. Therefore, the clean coating room needs to control environmental factors such as dust particles, temperature and humidity in the air through an efficient filtration system to ensure uniform and pollution-free coating.

Slitting Cleanroom
  The Slitting Cleanroom for lithium battery production is a clean environment specially designed for the battery electrode sheet slitting process. The slitting process is to cut the coated positive and negative electrode materials into a certain size for subsequent battery assembly. In order to ensure the quality and performance of the battery, especially the accuracy and uniformity of the electrode sheet, the environmental requirements of the clean slitting room are very strict.
1. Dust prevention and pollution control. The clean slitting room uses a high-efficiency air filtration system (such as HEPA filter) to filter the dust particles in the air to an extremely low level (generally requiring the number of dust particles in the air to be controlled at thousands or even hundreds of particles per cubic meter)
2. Temperature and humidity control. The clean slitting room will strictly control the temperature and humidity to prevent the electrode sheet from getting damp. The temperature is usually kept between 20-25°C, and the humidity is usually required to be less than 40% relative humidity.
3. Dust-free environment
4. Precision cutting and quality monitoring
5. Environmental monitoring and data recording
6. Personnel protection: Operators usually need to wear clean clothes, masks and gloves when entering the clean cutting room to reduce the introduction of external pollution sources and ensure that the environment during the operation is not affected.

Stacking/Winding Cleanroom

  The stacking/winding cleanroom in lithium battery production is a dedicated environment for the stacking or winding process of lithium battery electrode sheets. It requires strict control of dust, pollutants and humidity in the air to ensure the quality and performance of the battery. This process is to stack (stack) or wind the positive and negative electrode materials with the diaphragm into the core structure of the battery. Due to the precision of this stage and the high requirements for a clean environment, the environment of the cleanroom must meet high standards.
1. Stacking/Winding Process
2. Dust prevention requirements. The air in the clean room is treated by a high-efficiency filtration system (such as HEPA, ULPA filters) to ensure that the number of dust particles per cubic meter of air is very low, usually reaching ISO7 Cleanroom (Class 10,000 Cleanroom) or higher standard.
3. Humidity control. The humidity control in the clean room is usually required to be less than 40%, sometimes lower, to prevent the electrode sheets from getting damp and to ensure the consistency and stability of the battery.
4. Temperature control. The temperature of the clean room will be maintained between 20-25°C.

Sealing Clean Room
  The sealing cleanroom in lithium battery production is a clean environment used for the battery sealing process. During the sealing process, the battery cells are sealed into the shell to prevent external pollutants and moisture from entering. The clean room controls dust in the air through a high-efficiency filtration system to ensure stable humidity and temperature, usually with humidity below 40% and temperature between 20-25°C. The sealing process requires high-precision sealing technology to ensure the safety and performance of the battery. Operators need to wear clean clothes and the equipment is cleaned regularly to ensure the quality of the sealing.

Electrolyte Filling Cleanroom
  The electrolyte filling cleanroom in lithium battery production is a clean environment used to inject electrolyte into battery cells. Electrolyte is an important component of lithium batteries. It helps conduct current between the positive and negative electrodes inside the battery, affecting the performance and safety of the battery. The filling process needs to be carried out in a strictly controlled clean environment to prevent pollutants, dust and moisture from entering the battery
1. Prevent contamination during the filling process
2. The electrolyte is very sensitive to temperature and humidity, so the humidity in the clean room needs to be strictly controlled to prevent the electrolyte from absorbing water or volatilizing
3. Ensure accurate injection of electrolyte to avoid over- or under-injection, which affects battery capacity and life
4. Because the electrolyte is corrosive and volatile, the filling clean room is equipped with safety protection measures, such as ventilation systems, leak detection and explosion-proof equipment to ensure the safety of personnel and the environment.

Dry Room
  The lithium battery production drying room is used to remove moisture from battery materials and maintain a low humidity environment. Moisture can affect battery performance and safety, so the drying room uses dehumidification and temperature control equipment to ensure that the materials are not damp during the production process. Humidity is usually required to be between 1% and 5% to ensure battery quality and stability.
The main functions of the lithium battery production drying room include:
1. Prevent moisture intrusion: Prevent moisture in lithium battery materials from reacting with electrolytes to ensure battery performance and safety.
2. Improve battery quality: Ensure battery stability and avoid short circuits or failures in the battery due to excessive humidity.
3. Improve production efficiency: In a dry environment, battery components can complete the production process faster and reduce potential production defects.

Injection Molding Cleanroom
  The injection molding cleanroom ensures that the injection molding of lithium battery plastic parts is carried out in a dust-free environment, improving the quality of the parts and the sealing and safety of the battery as a whole.

Leak Testing Cleanroom
  The Leak Testing Cleanroom in lithium battery production is a clean environment used to test the sealing of battery shells and prevent gas leakage. Usually is ISO7 cleanroom  (Class 10,000 Cleanroom) or ISO6 clenaroom (Class 1,000 Cleanroom). During the battery packaging process, the battery shell must be tightly sealed to prevent outside air, moisture or pollutants from entering the battery, affecting battery performance and safety, and avoiding short circuits, leakage or other safety hazards inside the battery.