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1. The strict demand for humidity control in lithium battery production:
The harm of humidity to lithium batteries. During the production process of lithium batteries, high environmental humidity can lead to the following problems:
Material moisture absorption: Positive and negative electrode materials (such as high nickel ternary materials) react with moisture after absorbing moisture to generate Li ₂ CO ∝, which 2.decomposes during charging to produce CO ₂ gas, causing battery bulges, leakage, and even explosions.
Electrolyte reaction: LiPF ₆ in the electrolyte reacts with water to generate hydrogen fluoride (HF), which corrodes the internal structure of the battery and affects the formation of SEI film and battery life.
Micro short circuit risk: The combination of workshop dust and moisture may lead to micro short circuits between electrode pieces, reducing battery performance.
2. Humidity requirements for key processes:
Injection and sealing process: The dew point temperature of the environment should be controlled between -45 ℃ and -70 ℃, and the air humidity should be below 1% (i.e. dew point ≤ -42 ℃).
Raw material storage and polarizer manufacturing: Humidity must be strictly limited to avoid moisture absorption of materials affecting subsequent processes.
3. Core application scenarios of rotary dehumidifier:
Full coverage of production processes
The rotary dehumidifier covers the entire process of lithium battery production, including:
Raw material storage: prevent materials from becoming ineffective due to moisture absorption.
Pulping and coating: Control the moisture content of the pulp to ensure uniformity of the polarizer.
Injection and packaging: Achieve ultra-low dew point environment in glove boxes or enclosed workshops.
Formation and aging: avoid moisture affecting battery chemical stability
