Correct welding method of lithium battery pack
Process steps of gantry manual spot welding machine operation
Turn on the power—check whether the WELED switch is turned on—place the product to be welded on the table—step on the pedal—press down the welding head—complete spot welding—return the welding head
Precautions during welding
1. First of all, the battery cells should be neatly arranged on the battery cell bracket according to the battery pack process specifications. Here, it should be noted that the positive and negative poles of the battery cells cannot be placed incorrectly, otherwise the battery pack will be short-circuited.
2. Place the nickel sheet, and place the nickel sheet accurately according to the process design requirements of the battery pack.
3. Select the appropriate welding pin according to the demand
- 1.7 Straight-through welding needle: the most commonly used welding needle model, with good versatility, suitable for nickel sheets of 0.12mm-0.18mm.
- 3.0 eccentric spot welding needle: usually the front end is turned to 1.7/2.0. Because the welding needle is thick, it can weld thicker nickel sheet. The thickness of conventional welding nickel sheet is between 0.15-2.0mm. After the front end of the welding pin is consumed, the front end of the welding pin should be polished by lathe processing. Because the diameter is relatively large, the conductive effect is good, and the heat dissipation effect is good at the same time, which is conducive to welding. Usually suitable for welding larger battery packs.
- 6.0 bump solder pins are usually used for bump nickel sheet welding. For products with high quality requirements for battery packs, battery packs that often generate vibration or impact, or battery packs with large current overload, bump nickel sheet welding can be used , It is more convenient and not easy to stick needles when welding. Such as drone battery packs, power car battery packs, etc.
4. Place the assembled battery pack on the welding platform, adjust the welding head or soldering pin according to the height of the battery pack, and keep a distance of 2-3mm between the soldering pin and the battery core.
5. Adjust the appropriate welding pin spacing and welding head pressure as needed.
6. After the power supply is turned on, the parameter power supply current should be adjusted, and the appropriate welding current should be adjusted according to the thickness of the nickel sheet.
7. During the welding process, it is necessary to keep the surface of the nickel sheet and the battery core free of other impurities, otherwise there will be poor welding such as explosion.
8. The solder joints are evenly distributed and arranged neatly, and no welding deviation or solder joints are between the positive and negative gaps.
9. Pay attention to the number of solder joints, the battery pack is usually spot welded twice to form four solder joints. Avoid false welding of solder joints and reduce the probability of false welding. More solder joints have better conductivity and high firmness, but for general battery pack welding, four solder joints are enough. The number of solder joints depends on the requirements of the battery pack process design.
10. When spot welding, be careful not to place conductive items on the work surface, and not to wear metal items such as watches and rings. Protective equipment such as goggles and insulating gloves should be worn.
11. Grind the front end of the welding pin regularly to prevent the impurities produced by the surface oxidation of the welding pin from causing poor welding.
12. When welding a large battery pack, an epoxy plate should be placed. After the welding is completed, the epoxy plate is covered on this part, and then another part is welded to prevent welding spatter.
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