What should I pay attention to when welding lithium batteries?

1. Ultrasonic metal spot welding of lithium battery. Because the positive pole of the lithium battery cell is made of aluminum tape, it cannot be directly soldered. Therefore, it is necessary to add a nickel tape. The ultrasonic metal spot welding method is usually used: the high frequency oscillation of the ultrasonic wave is used to make the two The friction between the metal sheets generates high heat locally, and they are fused and connected. Frequency: 20K~35KHZ Time: about 0.*/S Metal ultrasonic welding machine pay attention to selecting the appropriate welding equipment. Take care to use proper welding parameters. Prevent the positive aluminum strip from over-welding, otherwise it will break easily. Prevent the positive aluminum strip from being welded firmly, otherwise the battery will be easily cut off; 2. The important principle of the solder connection of the lithium battery: use the soldering iron to heat the solder wire, so that the tin material adheres to the welded part, and connects after cooling. 1) Classification of soldering irons: A. Internal heating type and external heating type, internal heating type soldering iron heats up quickly. B. Ordinary soldering iron, temperature-regulating soldering iron, anti-static constant temperature soldering iron. 2) Soldering iron power: 30W, 35W, 40W, 50W, 55W, 60W, 65W, etc. 3) Soldering iron temperature: Set according to the area of u200bu200bsoldering tin and the amount of tin used. If the temperature is too low, the tin wire cannot be melted quickly, which will affect the welding speed. If the temperature is too high, the solder joints will not be smooth. The temperature of the soldering iron is generally set at 360°C±10°C 4) Welding posture: generous and natural, sitting upright. 5) Welding techniques: there are pen-holding methods and straight-holding methods. 6) Welding angle: The welding angle of the pen holding method is between 30 and 60. The best angle is 45 between the tip of the soldering iron and the object to be welded. 7) Solder composition: tin (Sn) 60~63%, lead (Pb) 40~37 %, rosin 1.0%~1.2% Some existing companies have begun to use lead-free solder 8) Soldering time: <3S9) Method: first put the soldering iron on the part to be soldered, and then put the tin wire in the gap between the tip of the soldering iron and the part to be soldered. 10) Welding volume: a proper amount of tin can cover the object to be welded. 10) Welding quality: the solder joints are bright and uniform, firm, without tin connection, missing solder, no false solder, no porosity, and no layer. The size of the solder joint is related to the amount of contact hot tin; 3. Super-welding process and requirements of the lithium battery shell 1) The package connection of the shell generally adopts ultrasonic plastic welding. 2) Working principle: The high-frequency oscillation of the ultrasonic wave is used to cause friction between the upper and lower shells, and the local temperature rises sharply and high heat occurs. The plastic flow of the material will appear between the two rubber parts, which will solidify under pressure to form a uniform weld. 3) Choose a suitable ultrasonic welding machine, 4) Use suitable welding parameters: power factor: force × speed, force has pressure (air pressure), and descending speed. The rate has frequency and amplitude, energy u003d power × time frequency: 20KHZ welding time, holding pressure time 5) The design of the shell and the protection board should pay special attention to the size matching to prevent the over-in-place or over-in-tightness. 6) The thickness of the protective plate and the layout of the components must fully consider the impact of ultrasonic waves to prevent the components from being shaken loose. 7) The effects of welding are affected: plastic materials, welding design, molds, etc. 8) Super welding quality: no super damage, no melt glue, no super height, uniform welding line, tight welding, the sample falls on the board at a height of 1m, and the X, Y, and Z surfaces are dropped once (a total of six times). Claim. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Analysis of charging methods and maintenance of polymer lithium batteries