801840 3.7V Soft Pack Lithium Polymer Battery

A soft pack lithium polymer battery 500mAh (3A discharge) uses a single pouch-cell design. Engineers set the nominal voltage at 3.7V and limit full charge to 4.2V. They control internal resistance to stabilize current output. Manufacturers match electrodes and regulate electrolyte to maintain consistent capacity. This process keeps performance predictable during high-rate discharge.

Materials and Internal Construction

Producers use lithium cobalt or blended cathode materials and pair them with graphite anodes. Copper and aluminum foils guide electron flow efficiently. Technicians insert a polymer separator to prevent short circuits while allowing ion movement. The outer pouch uses aluminum-plastic laminate to seal the cell and maintain flexibility. This structure resists mechanical stress and reduces puncture risk.

Cell Matching and Assembly Process

Technicians sort cells by voltage and internal resistance to ensure uniform performance. They use precision spot welding to attach nickel tabs and form low-resistance electrical paths. Then, they install a protection circuit module that regulates overcharge, over-discharge, and over-current conditions. Workers secure lead wires with strain relief to prevent connection failures during movement.

Sealing and Structural Finishing

Workers seal the pouch using heat-lamination under controlled pressure. This locks in electrolyte and blocks moisture. Next, they add insulation layers to strengthen the structure and maintain shape. Finally, technicians check for leaks and test insulation resistance. These steps confirm that each battery meets quality requirements.

Standards and Electrical Control

Manufacturers follow UN38.3, CE, and RoHS standards. They use a constant-current/constant-voltage (CC/CV) charging method to limit voltage to 4.2V. Technicians perform cycle tests at controlled temperatures to ensure stable high-rate discharge. The tests verify consistent performance over repeated use.

Sample making, processing and customization available

Product Features

• Customization Supported: Can be customized according to customer needs.
• High Power: Up to 20C discharge.
• Fast Charging: Up to 3C charging.Long Lifespan: Meets the requirements for long-term product use.
• Multi-Material System: Covers LCO, NCM, NCA, LFP, and other material systems.
• High Safety: Passes 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