18650 lithium batteries is one of the common lithium-ion batteries currently on the market. It is one of the important cells that make up the lithium battery PACK. The PACK process is determined by its structural specifications and properties. Obviously, multiple strings and multiple parallels are 18650 the biggest features of the battery PACK are its flexible combination and simple structure. Semi-automatic and fully automatic welding assembly has been realized in mass production. However, to achieve good assembly production, we also need to understand the structural characteristics of the 18650 lithium battery PACK battery pack.

These include: 18650 battery cells, battery protection plates, connecting nickel sheets, lead-out nickel sheets, green paper accessories, insulating paper, wires or plug wires, PVC outer packaging or shell, output (including connectors), key switch, power indicator, and EVA, highland barley paper, plastic brackets and other auxiliary materials together form the PACK, and most types of 18650 battery PACK are suitable for this process.

Laser welding is an important workstation on the 18650 battery PACK assembly line, including nickel sheet welding, soft connection welding, protective plate welding, etc. It replaces traditional resistance welding and avoids virtual welding between cells, welding penetration or welding points to increase the number of batteries. Resistors and other long-term shortcomings show that laser welding is crucial to the 18650 battery PACK manufacturing process.

1. Multi-parallel and multi-serial 18650 lithium battery pack design technology 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.

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.

2. Quality characteristics of 18650 lithium battery pack process

1. To use lithium batteries with acceptable quality, qualified and stable suppliers are required to provide single cells with good performance. The single cells must undergo a series of safety tests and performance tests and be used after passing the test.

2. The battery is required to have low internal resistance and good consistency. Whether it is a 14.8V lithium battery pack or other energy storage battery pack, low internal resistance must be ensured to ensure large current discharge capacity, platform, heat dissipation, etc.

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.

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, check whether the solder joints are firm after spot welding. In addition, vibration tests are conducted on each batch of products to verify the anti-vibration performance.

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

6. Verify the high and low temperature performance 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.