Understand the main points of the 18650 lithium battery pack process in one article
18650 lithium ion battery is one of the most common lithium ion batteries on the market, so what are the main points about the 18650 lithium ion battery PACK process? Let's take a look below.
The 18650 lithium battery pack process is mainly formulated according to the PACK battery structure. Most of the 18650 lithium battery pack process characteristics are similar, and their characteristics are more and more strings. The 18650 lithium battery pack process has distinctive characteristics. The biggest feature is the flexible combination. Most continuous orders can be completed by semi-automation. It is conceivable that the 18650 lithium battery pack process is now more and more streamlined, generally 18650 lithium battery PACK battery pack includes: 18650 battery cell, battery protection board, connecting nickel sheet, lead-out nickel sheet, green paper auxiliary material, insulating paper, wire or plug wire, PVC outer packaging or shell, output (including connector), key switch, The power indicator and EVA, barley paper, plastic support and other auxiliary materials together form a PACK, and most 18650 battery PACK types are suitable for this set of processes.
Multi-parallel multi-string 18650 lithium battery pack design process skills
1. Adopt the principle of priority and easy operation, that is, employees are easy to operate.
2. Adopt the principle of priority operation safety, that is, employees are not easy to short circuit or have better preventive measures during operation.
3. Adopt the principle of equipment, that is, the auxiliary equipment should be used as little as possible and at least semi-automatic.
4. The packaging design should be reasonable, easy to take and put, and don't take the product out to the customer for a long time.
18650 lithium battery pack process quality characteristics
1. The use of quality lithium batteries requires qualified and stable suppliers to provide single-cell batteries with good performance. The single-cell batteries undergo a series of safety tests and performance tests and are used after they are qualified.
2. It is required that the internal resistance of the battery is low and the consistency is good. No matter the 14.8V lithium battery pack or other energy storage battery packs, the capacity, platform, and heat dissipation of the low internal resistance to ensure large current discharge must be guaranteed.
3. Ventilation design is adopted in the battery structure, 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 sheet meets the requirements of high current discharge. The nickel sheet material guarantees low internal resistance. The spot welding machine guarantees stable operation. The welding pin guarantees quality. The operator is trained and qualified After the post operation, check whether the solder joint is firm after spot welding. In addition, each batch of products is subjected to vibration experiments to verify the anti-vibration performance.
5. Different batches of batteries are made into typical finished products and tested for life. When the experience of lithium battery PACK design specifications is summarized, the finished products are tested for cycles to get the actual cycle life.
6. Verify the high and low temperature performance of the battery. The batteries of different PACK lithium battery manufacturers are made into finished products and tested at different rates of discharge at high and low temperatures to obtain the actual discharge curve.
The above are the main points about the common PACK process of 18650 lithium battery.
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