18650 lithium battery 3.7 v

　　Assembling 18650 lithium-ion battery pack operation Spot welding machine technical details function and operation 1. Preparation before spot welding The selection and trimming of the welding electrode head 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 great influence on the welding parameters. Welding of different materials and structures should be selected according to the thickness and material of the battery and battery sheet.

　　Function and operation 1. Preparation before spot welding Selection and trimming of electrode head

　　The size of the welding electrode tip and the distance between the two electrode tips have a great influence on the welding quality. The thickness and material of the welding workpiece have a great influence on the welding parameters. Welding electrode heads of different materials and structures should be selected according to the thickness and material of batteries and battery sheets. If the distance between the welding electrode heads is too large, the welding cathode will increase, and the required energy will also increase accordingly, and the weldment may not be firm. It is generally more appropriate to adjust the distance between the two electrode heads to 3mm. Choose a welding head with a suitable shape, and use a fine file or sandpaper to grind the contact part 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 surfaces of the two spot welding pins are on the same horizontal plane, and check whether the spot welding surfaces of the spot welding pins have been oxidized, burnt black or even mushroom-headed. The welding pins are polished until the surface is smooth and oxide-free.

　　3) The spot welding machine is running normally, and the spot welding needle has no oxidation and mushroom head-like phenomenon. Then, the current, the height of the spot welding needle to the welding surface, and the air pressure parameters are debugged for the spot welding machine. The debugging effect is the result of spot welding. The product meets the following requirements, otherwise it needs to be re-tested until the spot-welded product can meet the requirements.

　　A: The solder joints of spot welded products have no phenomenon of fire or burnt black.

　　B: The nickel sheet spot-welded on the positive electrode of the square aluminum shell battery can withstand a pulling force of at least 3Kg on the battery, the nickel sheet on the negative electrode can withstand a pulling force of at least 1.5Kg on the battery, and the nickel sheet spot-welded on the protective plate can withstand at least 1.5Kg of pulling force on the battery. It can bear the pulling force of 1.5Kg.

　　C: The nickel sheet spot-welded on the positive electrode of the 18650 cylindrical battery can withstand a pulling force of at least 3Kg on the battery, and the nickel sheet on the negative electrode can withstand a pulling force of at least 3Kg on the battery.

　　4) After the battery spot welding machine is debugged and OK, the spot welding operation shall be carried out after requesting. When spot welding the positive pole of the aluminum shell battery, the nickel sheet connecting the protective plate and the battery cell is placed on the composite aluminum-nickel strip of the positive pole of the battery cell, 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), and at the same time ensure that there are 4 effective positive solder joints. When spot welding the negative electrode, put the nickel strip on the negative electrode of the battery cell, start the spot welding machine for spot welding, and there are only 2 effective welding spots for the negative electrode.

　　4.2 When spot-welding 18650 cylindrical batteries with a battery spot welding machine, put the nickel sheet at the positive and negative terminals of the battery, and spot-weld twice at different places of the positive and negative poles (the same spot cannot be spot-welded twice twice) to ensure positive and negative poles at the same time. 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 at the same time ensure that there are 2 effective welding spots.

　　5) During the spot welding operation, please do not adjust the height and parameters of the spot welding machine and the weldment. However, if it is found that the spot welding surfaces of the two welding pins are not on the same level, the welding pins should be adjusted so that they are on the same level. ) Grind and maintain the spot welding needles with sandpaper and abrasive belt every 1 hour (sandpaper should be parallel to the surface of the two welding needles and polished to ensure that the spot welding surfaces of the two welding needles are flat and at the same level , the abrasive belt should wrap the spot welding needle for grinding) in order to remove the oxides that appeared on the welding head of the spot welding needle in the previous operation, but within 1 hour, that is, before the next maintenance period, if the During the spot welding operation, there is a phenomenon of explosion or blackening of the solder joints or virtual welding or oxides on the spot welding needles. At this time, the spot welding needles should be polished and maintained.