18350 3.7V Cylindrical Lithium Battery

Cylindrical Lithium Battery Structural Configuration

Engineers manufacture the cylindrical lithium battery (18350, 3.7V class) using a compact electrochemical architecture designed around a tightly wound spiral core. First, they arrange cathode foil, separator membrane, and anode foil into a multilayer strip assembly. Then, they wind the layered structure into a dense cylindrical roll while continuously regulating tension and alignment accuracy. Meanwhile, technicians monitor edge positioning throughout the winding stage to reduce internal displacement and uneven compression. After forming the core, they install the assembly into a reinforced cylindrical enclosure and stabilize its geometry before electrolyte processing begins.

Material Composition and Electrochemical Layer Design

Manufacturers construct the cathode by coating lithium transition-metal compounds onto aluminum current collectors, while they fabricate the anode using graphite-based carbon slurry applied onto copper foil substrates. In addition, they introduce a microporous polyolefin separator to support ionic transport and maintain electrical isolation between electrodes. Furthermore, they prepare the electrolyte with lithium salts dissolved in organic carbonate solvents, and they strictly regulate impurity and moisture levels during formulation. Meanwhile, the cylindrical housing uses steel or aluminum alloy materials to maintain dimensional stability and mechanical durability under sealed conditions.

Electrode Production and Core Assembly Process

Technicians begin by dispersing active powders, conductive additives, and polymer binders into a stable slurry mixture. Subsequently, they coat the slurry onto metallic foils using automated precision coating systems. After coating, they dry the electrodes through staged thermal treatment to eliminate residual solvents and stabilize material adhesion. Next, calendaring equipment compresses the electrode surfaces to achieve controlled density and thickness uniformity. Then, they slit the processed materials into narrow strips and transfer them into automated winding machines to create a tightly packed jelly-roll structure. Meanwhile, operators secure current tabs using ultrasonic or resistance welding methods to ensure stable electrical pathways.

Formation Cycling and Industrial Standards

Engineers execute controlled formation cycling to activate electrochemical interfaces and stabilize internal reaction layers within the cell. Subsequently, they conduct thermal aging procedures under monitored environmental conditions to evaluate impedance stability and voltage consistency. Finally, quality control teams perform dimensional inspection, insulation resistance analysis, and sealing verification before shipment approval. Throughout manufacturing, producers comply with IEC 62133 and UN38.3 standards, ensuring cylindrical lithium battery production satisfies international transport safety, structural reliability, and electrical consistency requirements.

Product Features

1. 🛠️ Customizable
   Customizable to meet customer requirements
2. ⚡ High Power
   Max. 20C discharge rate available
3. ⏱️ Long Cycle Life
   Meets long-term product usage needs
4. 🛡️ High Safety
   Passed comprehensive safety tests
5. 🔋 True Rated Capacity
   Matches the product design capacity
6. ⚛️ Multi-Chemistry Options
   Covers LCO, NCM, NCA and LFP systems
7. 🧰 Multi-Protection Mechanism
   Built-in protection board with overcharge, overdischarge, overcurrent and short-circuit protection

Product Application Areas

This product is suitable for a variety of portable and powered electronic devices, with typical applications including:

• Personal Care & Health: Electric Toothbrushes, Beauty Devices, Fitness Trackers, Medical Devices

• Smart Digital & Audio: Headphones, Speakers, Nebulizers, Toys, Lights

• Financial Payment & Office: POS Machines, USB Tokens, Portable Printers