What should be noted when welding, soldering, and assembling 18650 lithium battery pack process?
The 18650 lithium battery pack process is mainly developed based on the structure of the PACK battery. Most of the 18650 lithium battery pack processes have similar characteristics, with the feature of multiple parallel and multiple strings. The characteristics of the 18650 lithium battery pack process are very distinct. The biggest feature of the 18650 lithium battery pack is its flexible combination, and most continuous orders can be completed semi automatically. However, it can be imagined that the 18650 lithium battery pack process is becoming increasingly simple. The general 18650 lithium battery pack process includes: 18650 cells, battery protection board, connecting nickel sheets, leading out nickel sheets, green paper accessories, insulation paper, wires or plug wires, The PVC outer packaging or shell, output (including connectors), key switch, power indicator, and auxiliary materials such as EVA, barley paper, plastic bracket, etc. together form the PACK, and most types of 18650 battery PACKs are closely related to it.
1、 What should be noted during the welding process of 18650 lithium battery pack?
1. Attention should be paid to the current of spot welding when welding 18650 lithium batteries.
2. Attention should be paid to the diameter of the welding needle when welding 18650 lithium batteries.
3. Attention should be paid to the spacing between welding pins when welding 18650 lithium batteries.
4. Attention should be paid to the number of welding points when welding the 18650 lithium battery pack process.
5. During spot welding, there should be no explosion, no short circuit, and no virtual welding.
2、 What should be paid attention to when soldering 18650 lithium battery pack process?
1. Attention should be paid to the diameter of the tin wire when soldering 18650 lithium batteries.
2. When soldering 18650 lithium batteries, attention should be paid to maintaining a constant soldering temperature.
3. When soldering, attention should be paid to how many seconds the soldering time should not exceed.
4. The soldering iron used for soldering different surface materials of 18650 lithium batteries also varies.
3、 What should be noted when assembling 18650 lithium battery pack process?
1. Set the internal resistance, voltage, and self discharge of the battery cell.
2. Set up the channel and level.
3. Set the number of groups for each channel.
4. If there are any defects, they need to be isolated and analyzed in a timely manner.
4、 Design process techniques for multiple parallel and multiple string 18650 lithium battery packs.
1. Adopt the principle of prioritizing easy operation, that is, easy operation for employees.
2. The principle of prioritizing operational safety is adopted, which means that employees are not prone to short circuits or have good preventive measures during operation.
3. Adopting the principle of equipment, that is, using auxiliary equipment to complete tasks as little as possible without manual labor, at least semi automated.
4. The packaging design should be reasonable, easy to handle and store, and not take the product out to the customer for half a day.
5、 Quality characteristics of 18650 lithium battery pack process:
1. The use of high-quality lithium batteries requires qualified and stable suppliers to provide high-performance individual batteries. The individual batteries undergo a series of safety and performance tests before being used.
2. Require low internal resistance and good consistency of the battery, whether it is a 14.8V lithium battery pack or other energy storage battery packs, to ensure low internal resistance, high current discharge capacity, platform, heat dissipation, etc.
3. The battery structure adopts a ventilation design, with a minimum spacing of 2mm between adjacent batteries. This structure requires the use of plastic brackets to fix the batteries.
4. PACK battery factory? Slotted nickel sheets are used for spot welding, and the size of the nickel sheets meets the requirements of high current discharge. The nickel sheet material ensures low internal resistance, the spot welding machine ensures stable operation, the welding needle ensures quality, and the operator is trained, assessed, and qualified before taking up the job. After spot welding, the weld points are checked for firmness. Conduct vibration tests on each batch of products to verify their anti vibration performance.
5. Different batches of batteries are made into typical finished products and subjected to life tests. When summarizing the experience of lithium battery PACK design specifications, the actual cycle life of the battery finished products is obtained by conducting cycle tests.
6. Verify the high and low temperature performance of the battery. The battery cells from different PACK lithium battery manufacturers are made into finished products and subjected to different rate discharge tests at high and low temperatures to obtain actual discharge curves
