15330 3.7V Compact Cylindrical LiPo Battery

Compact Cylindrical LiPo Battery Internal Structure

The small cylindrical LiPo battery (15330 class, 3.7V nominal) is designed by engineers with a tightly rolled electrode structure within a sealed metal cylinder. They initially laminate cathode foil, anode foil, and separator film into a continuous strip and they wind the assembly into a dense spiral core with controlled tension. In the meantime, they keep a high degree of alignment when winding to minimize internal stress distribution. Then, technicians place the completed jelly-roll core into a cylindrical housing that is machined to a high degree of precision and position it in place before the process of filling it with electrolytes commences.

Material System and Electrochemical Composition

Manufacturers apply lithium transition-metal oxide materials to aluminum foil to make the cathode layer, and apply graphite-based slurry to copper foil to make the anode layer. Moreover, they add a PP/PE microporous separator to facilitate the movement of ions and avoid internal short circuits. Moreover, they make an organic carbonate electrolyte that includes lithium salts like LiPF6, and they control the moisture level to ensure chemical stability. In the meantime, the cylindrical casing is made of steel or aluminum alloy in order to provide structural integrity and pressure resistance.

Electrode Fabrication and Winding Operation

The preparation of slurry by technicians starts with a blend of active powders, conductive additives, and polymer binders in a homogeneous suspension. They then apply the slurry on metal foils with precision coating machines and dry the electrodes in staged thermal ovens. They then use calendering pressure to regulate the consistency of electrode density and thickness. Once the foils are cut into thin strips, they are inserted into automated winding machines to create a small spiral design. Simultaneously, they weld electrode tabs with either ultrasonic or resistance technique to provide stable electrical connection.

Formation Cycling and Industrial Standards Control

Formation cycling is initiated by the engineers to bring about the electrochemical reactions and stabilize the interphase layer of solid electrolyte in the cell. They then perform aging tests in controlled temperature conditions to test the stability of voltages and impedance characteristics. Lastly, quality teams conduct dimensional inspection, internal resistance measurement, and sealing verification. During the manufacturing process, the manufacturers adhere to the IEC 62133 and UN38.3 standards, making sure that the structures are consistent, the electrical reliability is met, and the manufacture of compact cylindrical LiPo batteries is in compliance with the transport safety standards.

Product Features

1. Customizable

Customizable to meet customer requirements

2. High Power

Maximum discharge rate of 20C.

3. Long Cycle Life

Meets long-term product usage needs

4. High Safety

Successful overall safety tests.

5. True Rated Capacity

Equates the product design capacity.

6. Multi-Chemistry Options

Includes LCO, NCM, NCA and LFP systems.

7. Multi-Protection Mechanism

In-built protection board with overcharge, overdischarge, overcurrent and short-circuit protection.

Product Application Areas

This product fits many portable and powered electronic devices, and is commonly used in:

• Personal Care: Electric toothbrush.
• Audio & Entertainment: Toys, Headphones, Speakers.
• Medical & Health: Sports bracelet, Medical devices.
• Office & Digital: POS terminals, Lights.