801840 3.7V Soft Pack Lithium Polymer Battery

A single pouch cell is used in a soft pack lithium polymer battery, 500 mAh (3A discharge). The nominal voltage is established at 3.7V by engineers, and full charge is limited to 4.2V. They control internal resistance to stabilize current output. To ensure constant capacity, manufacturers pair electrodes and adjust the electrolyte. This process maintains predictability of performance in high-rate discharge.

Materials and Internal Construction

Manufacturers employ lithium cobalt or mixed cathode materials and combine them with graphite anodes. Copper and aluminum foils conduct the flow of electrons efficiently. Technicians place a polymer separator to avoid short-circuiting and allow ion movement. The outer pouch is made of aluminum-plastic laminate to cover the cell and keep it flexible. This design is mechanically stress-resistant and minimizes puncture.

Cell Matching and Assembly Process

To maintain uniform performance, technicians sort cells by voltage and internal resistance. They apply precision spot welding to fix nickel tabs and create low-resistance electrical circuits. After that, they mount a protection circuit module, which controls overcharge, over-discharge, and overcurrent. Strain relief is used to ensure that workers do not lose connection with lead wires as they move.

Sealing and Structural Finishing

Heat-lamination is used to seal the pouch under controlled pressure by workers. This seals in electrolyte and prevents moisture. They then apply insulation layers to reinforce the structure and keep it in shape. Lastly, technicians verify leaks and insulation tests. These processes ensure that every battery is of quality.

Standards and Electrical Control

Manufacturers adhere to UN38.3, CE, and RoHS. Their charging technique is constant-current/constant-voltage (CC/CV) to keep voltages at 4.2V. Cycle tests are conducted by technicians at controlled temperatures to guarantee a constant high-rate discharge. The tests confirm the uniformity of performance with repeated use.

Sample making, processing, and customization are available

Product Features

• Customization Supported: It can be customized based on customer requirements.
• High Power: Up to 20C discharge.
• Fast Charging: Up to 3C charging. Long Lifespan: Able to satisfy the criteria for long-term use of the product.
• Multi-Material System: Includes LCO, NCM, NCA, LFP, and other material systems.
• High Safety: Able to pass safety performance tests.
• Sufficient Capacity: Meets product design capacity requirements.
• High Temperature Resistance: Operating temperature range -20℃ ~ 80℃

Application Scenarios

• Electronic Atomizers
• Voice Recorders
• Headphones
• Beauty Devices