In lithium battery factories, the dryness requirements of compressed gas are extremely strict, pressure dew point is usually controlled between -40 ℃ and -70 ℃ to ensure the safety of battery production and product quality. The following is a detailed explanation of this requirement:
the core index of 1. dryness requirements: pressure dew point
- definition: Dew point refers to the air temperature when the water vapor content in the air reaches saturation and condenses into liquid water under a certain atmospheric pressure. The lower the dew point value, the lower the moisture content in the gas and the drier the gas.
- Lithium battery factory requirements in the production process of lithium batteries, the pressure dew point of compressed gas usually needs to be controlled between -40 ℃ and -70 ℃. This requirement is much higher than the standard for the dryness of compressed air in the general industrial field (usually the dew point temperature is in the range of 0-10 ℃), which reflects the extremely high requirements of the lithium battery industry for the dryness of the gas.
Analysis of the causes of 2. dryness requirements
prevent water absorption of battery materials:
- the production of lithium batteries has extremely high requirements for humidity, because moisture is one of the key factors affecting the performance of lithium batteries. Excessive humidity will cause the battery material to absorb moisture, which will affect the safety, cycle life and performance of the battery.
- In the key links such as electrode coating, baking and liquid injection, the drying room must maintain an extreme dry environment to prevent the adverse consequences of water absorption of the battery material.
Avoid safety accidents:
- any small fluctuations in moisture can have a serious impact on lithium battery production. Light lead to battery bulge, affecting the appearance and performance of the battery; heavy lead to safety accidents, such as battery short circuit, explosion, etc., pose a threat to personnel and equipment.
- Therefore, strictly controlling the dryness of compressed gas is one of the important measures to ensure the safety of lithium battery production.
Improve production efficiency:
- the dry gas helps to maintain the stability and consistency of the battery materials, thereby improving production efficiency.
- Production in a dry environment can reduce production failures and downtime caused by moisture, and improve the stability and reliability of the production line.
3. Measures to Realize the Requirements of Dryness
adopt high-performance drying and purification equipment:
- lithium battery factories should use high-quality compressed air drying and purification equipment, such as dryers with high-performance molecular sieve adsorption, to efficiently remove moisture and carbon dioxide from compressed air.
- The surface of the drying and purification equipment should be made of anti-corrosion and isolation materials, such as anodic oxidation, epoxy resin coating, stainless steel parts, etc., to ensure that the parts in contact with compressed air do not contain copper, iron, zinc, lead and other materials, so as to avoid pollution to the battery materials.
Monitor and adjust dryness in real time:
- in the drying room, advanced control system and automation equipment should be used to monitor and adjust the dryness parameters of compressed gas in real time.
- By installing monitoring equipment such as a dew point meter, the dew point temperature of the compressed gas can be grasped in real time to ensure the stability and accuracy of the dryness parameters.
Regular maintenance and maintenance of equipment:
- regularly maintain and maintain the drying and purification equipment to ensure its normal operation and efficient work.
- Regularly replace the desiccant, clean the filter and other components to maintain the dry purification effect of the equipment.
