18650 battery 3.7v 3500mah.Analysis of common process points for 18650 lithium-ion batteries

　　18650 lithium battery pack design process skills 1. Adopt the principle of giving priority to easy operation, that is, easy operation by employees. 2. Adopt the principle of giving priority to operational safety, that is, employees are not prone to short circuits or have better preventive measures when operating. 3. Adopt the equipment principle, that is, use assistance

　　18650 lithium-ion battery pack design process skills

　　1. Adopt the principle of giving priority to easy operation, that is, easy operation by employees.

　　2. Adopt the principle of giving priority to operational safety, that is, employees are not prone to short circuits or have better preventive measures when operating.

　　3. Adopt the equipment principle, that is, use auxiliary equipment to complete the work without manual labor as much as possible, at least semi-automatically.

　　Low temperature lithium iron phosphate battery 3.2V 20A -20℃ charging, -40℃ 3C discharge capacity ≥70%

　　Charging temperature: -20~45℃ -Discharge temperature: -40~+55℃ -40℃ Support maximum discharge rate: 3C -40℃ 3C discharge capacity retention rate ≥70%

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　　4. The packaging design must be reasonable, easy to take and put away, and the product should not be left out for a long time after the product is delivered to the customer.

　　18650 lithium-ion battery pack process quality characteristics

　　1. Use lithium-ion batteries with acceptable quality. Qualified and stable suppliers must supply single cells with good performance. The single cells must undergo a series of safety inspections and performance inspections and be used after passing the standards.

　　2. The battery is required to have low internal resistance and good consistency. Whether it is a 14.8V lithium-ion battery pack or other energy storage battery pack, 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 a spacing of no less than 2mm should be maintained between two adjacent batteries. This structure requires the battery to be fixed with a plastic bracket.

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

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

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　　4. The PACK battery factory uses slotted nickel sheets for spot welding. The size of the nickel sheets meets the requirements for large current discharge. The nickel sheet material ensures low internal resistance. The spot welding machine ensures stable operation. The welding needles ensure quality. The operator has been trained and assessed and qualified. After starting the operation, test whether the solder joints are firm after spot welding. In addition, each batch of products undergoes a vibration test to verify the anti-vibration performance.

　　5. Different batches of batteries are made into typical finished products and life tests are conducted. When the experience related to the lithium-ion battery PACK design specifications is summarized, the actual cycle life of the battery products is obtained through cycle detection.

　　6. Verify the high and low temperature performance of the battery. The cells of different PACK lithium-ion battery manufacturers are made into finished products and discharged at different rates under high and low temperatures to detect the actual discharge curve.

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