101938 3.7V 리튬 배터리

3.7V Lithium Battery Structure and Composition

The 3.7V lithium battery is composed of a positive electrode material, a negative electrode material, an electrolyte system, and a separator layer. The positive electrode typically uses lithium-based compounds such as lithium cobalt oxide, lithium iron phosphate, or lithium manganese oxide depending on the design specification. The negative electrode is commonly made of graphite or other carbon-based materials with stable intercalation properties. The electrolyte consists of lithium salts dissolved in organic solvents, enabling ion transfer between electrodes. The separator is a microporous polymer film designed to prevent direct contact between electrodes while allowing lithium-ion movement.

Manufacturing Materials and Cell Construction

During manufacturing, electrode materials are coated onto aluminum foil for the cathode and copper foil for the anode. These coated electrodes are precisely rolled or stacked to form a jelly-roll or laminated structure depending on cell type. The assembly process is carried out in a controlled dry environment to prevent moisture contamination. After stacking or winding, the cell is inserted into a casing, which may be cylindrical, prismatic, or pouch-type depending on design requirements. The electrolyte is then injected, and the cell is sealed using heat sealing or laser welding techniques.

Production Process and Formation

The production process includes electrode mixing, coating, drying, calendaring, slitting, stacking or winding, electrolyte filling, sealing, and formation cycling. Formation cycling is a critical step where controlled charging and discharging stabilize the internal chemical structure and activate the electrochemical system. Aging tests are performed afterward to ensure consistency in internal resistance and voltage stability across batches.

Technical Standards and Quality Control

3.7V lithium batteries are manufactured under strict industrial standards such as IEC 62133, UN38.3, and other regional safety certifications. Quality control procedures include dimensional inspection, impedance testing, capacity grading, leakage detection, and cycle life sampling. Environmental testing may involve high temperature, low temperature, vibration, and short-circuit simulations to validate structural integrity and electrochemical stability. Each production batch must pass traceability requirements to ensure compliance with international safety and performance regulations.

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