The 18650 lipo battery PACK process is mainly based on the structure of the PACK battery, and the characteristics of most 18650 lipo battery PACK processes are similar. The most prominent feature of the 18650 lipo battery PACK is its flexible assembly. Most continuous orders can be completed semi-automatically, indicating that the 18650 lipo battery PACK process is becoming more and more simple. Generally, an 18650 lipo battery PACK includes: 18650 battery, battery protection board, connection nickel sheet, lead-out nickel sheet, barley paper accessories, insulation paper, wire or plug wire, PVC outer packaging or shell, output (including connector), key switch, battery indicator, and EVA, barley paper, plastic bracket and other auxiliary materials. These items together make up the PACK, and the majority of 18650 battery PACK types adhere to the same principles.
Pay attention to the current used in spot welding the 18650 lithium battery.
Pay attention to the diameter of the welding needle when spot welding the 18650 lithium battery.
Pay attention to the distance between welding needles when spot welding the 18650 lithium battery.
Pay attention to the number of welding points when spot welding the 18650 lipo battery PACK process.
When spot welding, do not cause fire, short circuit, or virtual welding.
Pay attention to the diameter of the solder wire when soldering the 18650 lithium battery.
Pay attention to keeping the soldering temperature stable when soldering the 18650 lithium battery.
Pay attention to how long the soldering time should be.
Different soldering irons are used for different surface materials of the 18650 lithium battery during soldering.
Set the internal resistance, voltage, and self-discharge of the battery cells correctly.
Set the channel and gear properly.
Set the number of cells per channel.
If there are any defects, they should be isolated and analyzed promptly.
Adopt the principle of easy operation for employees.
Adopt the principle of safe operation, so that employees are not prone to short circuits or have better preventive measures.
Adopt the principle of using equipment, which means that operations that can be completed by auxiliary equipment should be done as much as possible, at least semi-automatically.
The packaging design should be reasonable and easy to hold and remove. Products should not be difficult to retrieve after being delivered to the customer.
It is essential to use high-quality lithium batteries from stable and qualified suppliers to ensure good battery performance after passing a variety of safety and performance tests.
Low internal resistance and good consistency of the battery are required. Regardless of whether it is a 14.8V lipo battery PACK or other energy storage battery pack, low internal resistance ensures high current discharge capacity, platform capacity, heat dissipation, and stability.
Ventilation design is employed in battery structure, and the distance between adjacent two batteries should not be less than 2mm. Plastic support should be used to fix the battery.
During spot-welding, slotted nickel plates should be used, and the size should meet the requirements of high current discharge. Nickel plate material should ensure low internal resistance. The spot-welding machine should work stably, and the quality of the welding needle should be guaranteed. The operator must be trained and qualified before going to work. After welding, check whether the welding point is firm. In addition, vibration tests should be conducted on each batch of products to verify their shock resistance.
Typical finished products made by different batches of batteries should undergo life tests, and the actual cycle life should be obtained from the cycle test results when summarizing the experience of 18650 lipo battery PACK design specification.
High and low-temperature performance of batteries should be verified. Different PACK lithium battery manufacturers' batteries should be made into finished products and subjected to different rate discharge tests under high and low-temperature conditions to obtain the actual discharge curve.