18650 li ion rechargeable battery

　　18650 lithium battery pack process quality characteristics

　　1. To select a lithium battery that has passed the quality standard, a qualified and stable supplier is required to provide a single battery with excellent performance. The single battery has passed a series of safety tests and performance tests before being used.

　　Low temperature high energy density 18650 3350mAh-40℃ 0.5C discharge capacity ≥60%

　　Charging temperature: 0~45℃ Discharging temperature: -40~+55℃ Specific energy: 240Wh/kg -40℃ discharge capacity retention rate: 0.5C discharge capacity≥60%

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　　2. The internal resistance of the battery is required to be low and the consistency is good. Regardless of the 14.8V lithium battery pack or other energy storage battery packs, low internal resistance must be ensured to ensure the capacity, platform, and heat dissipation of large current discharge.

　　3. The battery structure adopts a ventilation design, and the distance between two adjacent batteries is not less than 2mm. This structure requires a plastic bracket to fix the battery.

　　4. The PACK battery factory uses slotted nickel sheets for spot welding. The size of the nickel sheets meets the requirements of high-current discharge. The material of the nickel sheets ensures low internal resistance. The spot welding machine ensures stable work, the welding needles ensure the quality, and the operators are trained and qualified. After the on-the-job operation, check whether the solder joints are strong after spot welding. In addition, each batch of products is subjected to vibration experiments to verify the anti-vibration function.

　　5. Different batches of batteries are made into typical products and life tests are done. When the lithium battery PACK design specification experience is summarized, the battery products are cycle tested to obtain the actual cycle life.

　　6. Verify the high and low temperature function of the battery. The batteries of different PACK lithium battery manufacturers are made into finished products, and they are tested at different rates of discharge at high and low temperatures to obtain the actual discharge curve.