Detailed technical explanation of the operating spot welding machine for assembling 18650 lithium battery packs

Function and operation 1. Preparation before spot welding. The selection and trimming of the welding electrode head and the size of the welding electrode head and the distance between the two electrode heads have a great influence on the welding quality. The thickness and material of the welding workpiece have a greater influence on the welding parameters. The welding electrode heads of different materials and structures should be selected according to the thickness and material of the battery and the battery sheet. If the distance between the welding electrode tips is too large, the welding cathode will increase, and the required energy will increase accordingly. The weldment may not be firm. The distance between the two electrode tips is generally 3mm. Choose a suitable shape of the welding electrode head, and use a fine file or sandpaper to grind the contact parts to keep the welding head flat and smooth. 1) Turn on the power switch to check whether the equipment is operating normally. 2) Check whether the spot welding surface of the two spot welding needles are on the same horizontal plane, and check whether the spot welding surface of the spot welding needle has been oxidized, burnt, or even mushroom-shaped. If so, use sandpaper or sanding tape. Polish the spot welding needle until the surface is smooth and free of oxides. 3) The spot welding machine is operating normally, and the spot welding needle is not oxidized or mushroom-shaped. Then the spot welding machine is adjusted for current, the height of the spot welding needle to the welding surface, and the air pressure parameters. The debugging effect is the spot welding. The product meets the following requirements, otherwise it needs to be re-debugged until the spot welded product can meet the requirements. A: The solder joints of the products produced by spot welding have no fire or blackening phenomenon. B: The nickel sheet spot-welded on the positive electrode of the square aluminum shell battery can withstand a minimum of 3Kg of tension to the battery, the nickel sheet of the negative electrode can withstand a minimum of 1.5Kg of tension to the battery, and the nickel sheet spot-welded on the protective plate is the least to the protective plate. Can withstand a pulling force of 1.5Kg. C: The nickel sheet spot welded on the positive electrode of the 18650 cylindrical battery can withstand at least 3Kg of pulling force on the battery, and the nickel sheet of the negative electrode can withstand at least 3Kg of pulling force on the battery. 4) After the battery spot welding machine is debugged OK, perform the spot welding operation after the request is made. When spot welding the positive electrode of the aluminum shell battery, the nickel sheet connecting the protective plate and the battery core is placed on the composite aluminum nickel strip of the battery positive electrode, and the spot welding machine is started to perform spot welding twice in different places (the same spot cannot be spot welded repeatedly 2 times), while ensuring that there are 4 effective solder joints on the positive electrode. When spot welding the negative electrode, place the nickel strip on the negative electrode of the battery and start the spot welding machine for spot welding. There are only 2 effective welding points for the negative electrode. 4.2 When spot welding the 18650 cylindrical battery with the battery spot welder, place the nickel sheet at the positive and negative ends of the battery, and spot weld twice at different positions of the positive and negative electrodes (the same spot cannot be spot welded twice) while ensuring the positive and negative ends. Each negative electrode has 4 effective solder joints. 4.3 When spot welding the protective plate, place the nickel sheet on the nickel-plated steel sheet of the protective plate, start the spot welding machine for spot welding, and ensure that there are 2 effective welding points. 5) During the spot welding operation, please do not arbitrarily adjust the height and various parameters of the spot welding machine and the weldment. However, if it is found that the spot welding surfaces of the two solder pins are different on the same horizontal plane, the solder pins should be adjusted so that the two solder pins are on the same horizontal plane. ) The spot welding needles should be polished and maintained with sandpaper and abrasive belt every 1 hour (the sandpaper should be parallel to the surfaces of the two welding needles and be polished to ensure that the spot welding surfaces of the two welding needles are flat and in the same horizontal plane. , The abrasive belt should wrap the spot welding needle for polishing) in order to remove the oxides that appeared in the welding head of the spot welding needle during the previous operation, but within 1 hour, that is, when the next maintenance period is not reached, if the During the spot welding operation, there is a phenomenon of fire, blackening of the solder joint, or false welding or the phenomenon of oxide on the spot welding needle. At this time, the spot welding needle should be polished and maintained. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.