Lithium Ion Battery Manufacturing Process

Electrode Preparation, Cell Assembly, and Formation
Manufacturing begins with electrode preparation, where active materials are mixed with binders and conductive additives to form a slurry. This mixture is coated onto metal foils and dried before undergoing calendering, which compresses the material to optimize density and electrical properties. Next, the cell assembly stage involves cutting electrodes to precise sizes, stacking them with separators, and injecting the electrolyte. Once sealed, the cell moves to the formation process, where it is charged for the first time to develop a stable solid electrolyte interphase (SEI) layer, a critical factor in battery longevity.

Battery Pack Assembly and Quality Testing
Once individual cells are ready, they are combined into modules and packs. A battery management system (BMS) is integrated to monitor temperature, voltage, and charging cycles, ensuring safe operation. The final battery pack undergoes rigorous quality testing, including cycle life evaluations, leakage detection, and thermal stability assessments.
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