101938 3.7V Lithium Battery

3.7V Lithium Battery Structure and Composition

The lithium battery (3.7 V) consists of a positive electrode material, a negative electrode material, an electrolyte system, and a separator layer. Lithium-based compounds like lithium cobalt oxide, lithium iron phosphate or lithium manganese oxide are usually used in the positive electrode depending on the design specification. The negative electrode is usually composed of graphite or other carbon materials that have stable intercalation characteristics. The electrolyte is made up of lithium salts in organic solvents, which facilitate the transfer of ions between electrodes. The separator is a microporous polymer film that ensures that the electrodes do not come into direct contact with each other and the lithium-ion movement is allowed.

Production Process and Formation

In the manufacturing process, the electrode materials are sprayed on aluminum foil (cathode) and copper foil (anode). These coated electrodes are rolled or stacked to a jelly-roll or laminated structure, specific to cell type. The assembly is done under a dry controlled environment to avoid contamination by moisture. The cell is then stacked or wound and then fitted into a casing, which can be cylindrical, prismatic or pouch-type depending on the design requirements. The electrolyte is then injected and the cell is then sealed by using heat sealing or laser welding.

Production Process and Formation

The process of production involves the electrode mixing, coating, drying, calendering, slitting, stacking or winding, filling the electrolyte, sealing and formation cycling. The formation cycling is an important process, during which the internal chemical structure is stabilized through controlled charging and discharging, and the electrochemical system is activated. Aging tests are then carried out to maintain consistency in internal resistance and voltage stability between batches.

Technical Standards and Quality Control

The manufacture of 3.7V lithium batteries is done in accordance with strict industrial standards like the IEC 62133, UN38.3 and other regional safety standards. The quality control processes are dimensional inspection, impedance testing, capacity grading, leakage detection, and cycle life sampling. Environmental testing can be done with high temperature, low temperature, vibration and short-circuit testing to ensure structural integrity and electrochemical stability. The production batches should be traceable to meet the international safety and performance standards.

Product Features

1. Customizable

Customizable to meet customer requirements

2. High Power

Maximum rate of discharge at 20C.

3. Long Cycle Life

Meets long-term product usage needs

4. High Safety

Safety tests all complete.

5. True Rated Capacity

Equates to the product design capacity.

6. Multi-Chemistry Options

Includes LCO, NCM, NCA and LFP systems.

7. Multi-Protection Mechanism

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

Product Application Areas

This product can be used in many types of portable and powered electronic devices, common uses being:

Personal Care and 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.