3075105-3S Li-ion Polymer Battery 850mAh

Li-ion Polymer Battery 850mAh Structural Overview

Engineers build the 3075105 3S Li-ion polymer battery pack (850mAh class) using a layered modular assembly process. First, they arrange three pouch cells in a series configuration and align them into a compact structural layout. Then, technicians apply insulating separators between each cell to maintain spacing stability and reduce internal contact stress. Meanwhile, cell matching is performed before assembly to minimize voltage deviation and internal resistance imbalance. After positioning, the structure is prepared for electrical interconnection and sealing integration.

Cell Material System and Internal Composition

Each pouch cell is constructed using a lithium-ion polymer chemistry system. The cathode is made of lithium metal oxide coated on aluminum foil, while the anode uses graphite-based carbon material coated on copper foil. In addition, a microporous polymer separator is inserted to allow lithium-ion transfer while preventing direct electrode contact. Furthermore, the electrolyte consists of lithium salts dissolved in organic carbonate solvents, with strict moisture control during mixing and injection. Meanwhile, the outer enclosure uses aluminum-plastic laminated film, providing flexible sealing instead of a rigid metal casing.

Pack Assembly and Electrical Connection Process

Technicians first sort and match all cells based on capacity, voltage, and internal resistance consistency. Next, they connect cells in a 3S configuration using conductive tabs through spot welding or compression bonding. After that, a protection circuit module (PCM/BMS) is integrated to manage overcharge, over-discharge, and short-circuit protection. Meanwhile, balance leads and output wires are carefully routed and insulated to prevent electrical faults. In addition, continuity checks are performed to ensure stable electrical pathways across the pack.

Formation Testing and Safety Standards

Engineers perform initial charge-discharge cycling to activate electrochemical stability and balance all series cells. Afterwards, aging tests are conducted to evaluate voltage consistency and internal resistance drift. Finally, insulation testing, weld inspection, and full electrical verification are completed. Throughout production, the Li-ion polymer battery 850mAh complies with IEC 62133 and UN38.3 standards, ensuring structural reliability, electrical safety, and transport compliance.

Product Features

• Ultra-thin and compact design: Only 9mm thick, easily embedded in portable medical devices, saving space.
• Medical-grade safety standards: Polymer soft-pack structure; in case of abnormalities, it will only bulge but not explode, ensuring safer use.
• Stable 11.1V output: Three battery cells connected in series ensure a stable voltage platform, guaranteeing accurate operation of medical devices.
• Long-lasting battery life: 850mAh capacity meets the needs of long-term monitoring or diagnosis.
• Multiple international certifications: Certified by KC, CB, UN38.3, TUV, CQC, MSDS, CE, IEC62133, etc., ensuring reliable quality.
• Customization available: Size and parameters can be flexibly adjusted according to device space and capacity requirements.
• Low internal resistance design: 60 milliohm internal resistance, high discharge efficiency, and faster device response.
• Pre-charged at the factory: 12.0V factory voltage, ready to use out of the box, no need to wait for charging.

Application Scenarios

• Portable medical devices (monitors, diagnostic instruments)
• Rehabilitation and physiotherapy equipment
• Handheld medical terminals
• Other mobile devices with strict requirements for thickness and safety