18650 lithium battery assembly method
We know that the shell of the 18650 battery is a steel shell, and it is difficult to weld with an electric soldering iron without a dedicated battery spot welder.
Of course, there are also powerful battery fluxes now available that can easily solder 18650 batteries with it and a normal soldering iron.
But this kind of strong flux is corrosive, not only corrodes the battery case and positive electrode, but also corrodes the soldering iron tip. So, how do you weld 18650 cells and battery packs without a battery spot welder?
18650 batteries assembled into a battery pack need to pay attention to the following points:
1. The batteries are neatly arranged, which is helpful for easy maintenance in the future. Best to use a standard 18650 battery tray
2. The welding is good, and the most welding method on the market is spot welding with a nickel welder. An electric soldering iron can also be used, and the solder joints are in good contact.
3. After welding, the lines of each group of batteries must be clearly arranged
4. Do a good job of waterproofing and insulation, it is best to cut a piece of highland barley paper or use asbestos material
5. The most important point is that the internal resistance of the battery before welding, the current voltage error should not exceed 0.05V! Conditionally, a special protection board for lithium batteries must be added to prevent overshoot and overdischarge
6. After welding, measure whether the voltage of each circuit is good
7. After using the newly assembled battery pack for a period of time, check the voltage of the battery in groups.
This is all the materials to assemble a set of 18650 lithium battery for electric vehicles, including stainless steel battery case
This is the accessory material, wire tape heat shrinkable film, and a voltmeter. The voltmeter is installed on the battery box to judge the battery level.
The separator and the bracket for fixing the 18650 battery, a protective plate, the lithium battery must have a protective plate, otherwise it will be scrapped after one discharge
The most important thing is the 18650 battery. Electric vehicles must choose power cells.