103048 Flat Lithium Polymer Battery

Flat Lithium Polymer Battery Materials Composition

Flat lithium polymer battery is made up of cathode material, anode material, electrolyte system, separator film, and aluminum-plastic composite pouch. The cathode layer is typically made of lithium cobalt oxide or ternary lithium metal oxides coated on aluminum foil. The anode layer is made with artificial graphite coated on copper foil to create a stable intercalation structure. The ion-conductive medium is a lithium salt, e.g., LiPF6 dissolved in organic carbonate solvents. The separator is a microporous polymer film (PE/PP multilayer) that prevents the contact of electrodes and allows ionic exchange. The external structure is made up of laminated aluminum-plastic film to create a sealed flat pouch cell.

Electrode Manufacturing and Coating Process

The process of electrode production starts with slurry mixing of active materials, conductive carbon and polymer binders. The slurry is then deposited on metal foil substrates with precision comma blade or slot-die coating equipment. The electrodes are then dried in controlled ovens in multi-stage process to eliminate the solvents. Calendaring is used to compress the electrode density and to provide uniform thickness. The electrodes are then coated and cut to desired widths to be used in assembling the cells.

Formation of Cells and Flat Pouch

Flat lithium polymer cells take a stacking or winding procedure based on design specification. In pouch-type flat cells, current collectors are made by piling up electrodes and separators in alternating layers and welding them ultrasonically or tab-welding them. The assembly is then put into an aluminum-plastic laminate pouch. Electrolyte injection is done under vacuum conditions to make sure that electrodes are completely wet. The pouch is then heat sealed with the use of heat sealing technology to ensure internal isolation.

Technical Standards and Quality Requirements

The production and testing are based on international lithium battery standards such as IEC 62133, UN38.3 transport safety regulation, and IEC 61960 on performance assessment. Quality control involves dimensional inspection, leakage testing, insulation resistance testing and charge-discharge cycling validation. Electrical parameters like charge cut-off voltage (4.2V), discharge cut-off voltage (approximately 2.5-3.0V, depending on specification) and discharge rate capability (usually 0.5C -1C continuous) are closely checked. Environmental testing involves vibration, thermal shock, and high temperature storage to guarantee structural and electrochemical consistency in controlled environments.

🔋 Battery Product Features

• Customization Supported: Can be customized to the customer's needs.
• High Power: Up to 20C discharge.
• Fast Charging: Up to 3C charging.
• Long Lifespan: Fits the criteria of long-term product use.
• Multi-Material System: Incorporates LCO, NCM, NCA, LFP, and other material systems.
• High Safety: Passes safety performance tests.
• Adequate Capacity: Adequate capacity to meet product design capacity.
• High Temperature Resistance: Operating temperature range -20℃ ~ 80℃.

🛡️ Lithium Battery Protection Board Features

• Charging Protection: Protection against overcharging.
• Discharging Protection: Stops excessive discharging.
• Overcurrent Protection: Prevents overcurrent.
• Short Circuit Protection: Prevents short circuit faults.

Application Scenarios

• Personal Care: toothbrushes, beauty appliances, electric.
• Sound: Headphones, speakers.
• Electronic Cigarettes: Electronic atomizers.
• Smart Devices: Fit trackers, toys, lights.
• Office Supplies: POS machines, portable printers.
• Financial Security: USB tokens.
• Medical Equipment: Medical devices.