The 18650 lithium iron phosphate battery can be connected in series at 36V with cables. As for soldering, it usually involves nickel tabs. You can use WEWELDING88C low temperature welding wire and WE88C-F flux welding. electric soldering iron. There is a case reference for welding round battery cables of lithium batteries: WEWELDING88C Low Temperature Stainless Steel Welding Wire, Welding Case Summary Update.
The author's question is a bit biased. It should focus on lithium battery assembly, not lithium battery production. Lithium battery assembly is a technology that combines cells, protective plates, nickel strips, casings, etc. The threshold for this is low, you can learn it quickly, and the technical difficulty is low. Once you learn it, it's not a big problem to test,to simply repair and disassemble a lithium battery if you want to do some good. Work in lithium battery PACK technology, you still need more practical experience.
Be careful when starting a business. Don't think that if you buy equipment and learn skills that the manufacturer will be responsible for your survival, you will definitely make money! Additionally, you need to be tech savvy and know how to sell the products you make. If you master the technology yourself, you don't have enough sales experience and can't sell it. You can only make it for your own use, which is equivalent to buying scrap metal.
These equipment manufacturers only want to sell you the equipment and cannot provide much after-sales service.
In addition, lithium batteries, like lead acid batteries, present a risk of accident. The PEEvery store still needs strong insurance support. Otherwise, once an accident occurs, ten years of hard work will be in vain!
There is a lithium battery PACK technology manufacturer, famous for its ODM (customized processing) technology. It was favored by Google and reached strategic cooperation. Industry (puxun lithium battery). If you benefit from their technical advice, coupled with perfect after-sales service and insurance, you should be able to start a business with confidence, but you must always rely on yourself. Don't expect to make 100% money just by learning technology. . There is no free pie in the world!