48v solar power energy storage power wall.What are the key points about the PACK process of 18650 lithium-ion battery?

The 18650 lithium battery pack process is mainly formulated based on the PACK battery structure. Most of the 18650 lithium battery pack process features are similar, with multiple parallels and multiple series. The 18650 lithium battery PACK process has distinctive features. The biggest feature is the flexible combination. Most continuous orders can be completed semi-automatically. It is conceivable that the 18650 lithium battery pack process is becoming more and more streamlined.

18650 lithium-ion battery is one of the most common lithium-ion batteries on the market now. So what are the keys to the PACK process of 18650 lithium-ion battery? Let’s take a look below.


The 18650 lithium battery pack process is mainly formulated based on the PACK battery structure. Most of the 18650 lithium battery pack process features are similar, with multiple parallels and multiple series. The 18650 lithium battery PACK process has distinctive features. The biggest feature is the flexible combination. Most continuous orders can be completed semi-automatically. It is conceivable that the 18650 lithium battery pack process is becoming more and more streamlined. Generally, 18650 lithium BATTERY PACK The battery pack includes: 18650 battery cells, battery protection plate, connecting nickel sheet, lead nickel sheet, green paper accessories, insulating paper, wires or plug wires, PVC outer packaging or shell, output (including connector), key switch , power indicator, and auxiliary materials such as EVA, highland barley paper, and plastic brackets 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 technology skills


1. Adopt the principle of giving priority to easy operation, that is, easy operation by employees.
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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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, it should be completed with auxiliary equipment without manual labor as much as possible, and at least semi-automated.


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 battery pack process quality characteristics


1. To use lithium batteries with acceptable quality, a qualified and stable supplier is required to provide single cells with excellent performance. The single cells must pass a series of safety tests and functional tests and be used after passing the test.
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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2. The battery is required to have low internal resistance and good consistency. 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 ventilation design, and the distance between two adjacent batteries should be no less than 2mm. This structure requires the battery to be fixed with a plastic bracket.


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 materials ensure low internal resistance. The spot welding machine ensures stable operation. The welding needles ensure quality. The operators have been trained and tested and qualified. After starting the operation, check whether the solder joints are strong after spot welding. In addition, vibration experiments are conducted for each batch of products to verify the anti-vibration function.


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


6. Verify the high and low temperature functions of the battery. The cells of different PACK lithium battery manufacturers are made into finished products and discharged at different rates under high and low temperatures to obtain actual discharge curves.