How to solder 18650 battery?

How to weld 18650 battery? There are many factors that affect the welding quality of 18650 battery. From the manufacture of lithium batteries to the assembly of battery packs, battery welding is a very important manufacturing process. The electrical conductivity, strength, air tightness, metal fatigue and corrosion resistance of lithium batteries are typical indicators for evaluating battery welding quality. The choice of 18650 lithium battery welding method and welding process will directly affect the cost, quality, safety and consistency of the battery. Among various welding methods, laser welding has the following advantages: First, laser welding has high energy density, small welding deformation, and small heat-affected zone, which can effectively improve the accuracy of the workpiece. The welding seam is smooth, free of impurities, uniform and dense, and no additional grinding is required. Second, laser welding can be precisely controlled, with a small focus point and high positioning accuracy. It is easy to automate the robotic arm, improve welding efficiency, reduce labor time, and reduce costs; in addition, laser welding of thin plates or thin-diameter steel wires is not like arc welding It is easily affected by failures. 1. Electromagnetic tabs are made of nickel sheet, which can be welded with WEWELDING88C welding wire and WEWELDING88C-f flux. Welding method: first preheat the fixed head of the soldering iron, then apply flux to the welding wire on the solder joint, and then use the flux to assist the welding wire to melt and shape. 2. If the lugs are made of aluminum, use low temperature 179cM51 welding wire and M51-f flux. Welding method: first preheat the fixed head of the soldering iron, then apply flux to the welding wire on the solder joint, and then use the flux to assist the welding wire to melt and shape. Generally, the thickness of the aluminum shell of power lithium-ion battery is less than 1.0mm. At present, according to the battery capacity of mainstream manufacturers, the thickness of the casing material is important to be 0.6mm and 0.8mm. Welding methods are mainly divided into side welding and top welding. The important advantage of side welding is that it has little effect on the inside of the battery, and splashes will not easily enter the inside of the casing. Since welding may cause swelling, this will slightly affect the subsequent assembly process. On the one hand, the welding process has higher requirements for the stability of the laser, the cleanness of the material and the matching gap between the top cover and the aluminum shell of the power lithium-ion battery. However, since the top welding process is on a single surface, a more effective vibro-scan welding method can be used. However, the requirements for the positioning of the shell in the previous process and the automation of the equipment are higher. Note: 1. Welding strength: ≥15, the internal resistance of the battery increases, the performance of the battery is reduced, and the use time is short. 2. Spot welding appearance: no explosion, false welding and lug falling off, no penetration, bumps, or deformation at the bottom of the shell , Explosion and other undesirable phenomena; poor appearance, easy to rust; if it is welded, it will leak water and the battery will be scrapped. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: 18650 lithium battery usage and precautions