Views: 8 Author: Site Editor Publish Time: 2024-07-18 Origin: Site
Recently, the EU intends to impose higher tariffs on Chinese electric cars to protect its own automobile industry. This policy has a great impact on the global, especially Chinese electric cars market. As the core component of electric vehicles, every detail in the production process of batteries is crucial to the performance and quality of the final product.
In the battery production process, moisture control is a crucial link. Moisture has a significant impact on battery performance and must be strictly controlled. Moisture in the battery may cause the electrolyte to deteriorate, or react with the electrolyte to produce harmful gases, increase the internal pressure of the battery and cause deformation. Excessive moisture can also lead to high internal resistance, high self-discharge, decreased capacity, poor cycle performance, and even leakage, greatly deteriorating battery performance. Therefore, battery drying technology plays a key role in lithium battery production.
Drying is a process that vaporizes and escapes moisture by providing energy to wet materials. In industry, there are many types of drying equipment. According to the operation mode, it can be divided into continuous drying equipment and intermittent (batch) drying equipment; according to the operating pressure, it can be divided into atmospheric drying equipment and vacuum drying equipment; according to the heat conduction mode, it can be divided into conduction drying equipment, convection drying equipment, radiation drying equipment and dielectric drying equipment.
In battery production, moisture mainly comes from battery raw materials (such as positive and negative plates, diaphragms, electrolytes and other metal parts) and factory environment. The moisture in the environment can be eliminated by establishing a drying workshop and using a dryer to generate dry air. The moisture inside the battery needs to be removed by vacuum drying equipment, and the moisture content is usually required to be between (100~300)×10^-6 to ensure that the drying effect meets the standard.
Vacuum drying uses the difference in the boiling point of water under different air pressure environments to promote the drying process. Under normal pressure, the boiling point of water is 100℃, but under low air pressure, the boiling point of water will be significantly reduced. For example, in a vacuum environment of 100Pa, the boiling point of water drops to about -20℃. This principle enables the vacuum environment to effectively promote the drying process.
Vacuum drying is the process of removing moisture from materials under environmental conditions below standard atmospheric pressure. During the drying process, the vacuum system extracts air and heats the material at the same time, so that the internal moisture diffuses to the surface through pressure difference or concentration difference. The water molecules gain enough kinetic energy on the surface to overcome the intermolecular attraction, fly into the low-pressure space, and are pumped away by the vacuum pump.
Our vacuum spiral dryer plays an important role in battery production.
The material is in direct contact with the heated dryer. The heating components include the chamber, screw blades, and the main shaft, and the materials are homogenously mixed by rotating rake teeth and screw blades. Usually using thermal oil or steam or hot water as the heating medium, or directly using electric heating.
The continuous circulation along the heating surface causes the liquid to evaporate evenly and keeps the temperature and humidity of the material in the dryer uniform. The generated steam is condensed by the condenser and discharged to the buffer tank. The shape of the screw blades and the main structure ensure the best heat exchange between the material and the heating area, while breaking up the lumps and obtaining fine particles or powdered materials to improve the drying efficiency.
Against the backdrop of the EU's increased tariffs on Chinese electric vehicles, battery manufacturers need to pay more attention to the optimization of production technology and improve product quality and production efficiency by using efficient vacuum drying technology to meet the challenges and competition in the international market.
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