Yes, I just use a soldering iron to directly solder the connection wires. Of course, the best way to use them is to use a spot welder to spot weld the nickel sheet to be connected or soldered.
For soldering, use a 50-100W soldering iron. Use a knife to scrape the lithium battery poles (scrape with a broken saw blade), apply a small amount of paste soldering iron, fully immerse the soldering iron. Solder and use solder to contact the solder point over a large area. Do not move the soldering iron head and wait 5-7 seconds to heat the pole (after three seconds of heating, you can move the soldering iron tip left and right to rub the soldering surface). Do not heat the pole for too long. Remove the soldering iron tip and check the tinning condition of the solder. If there is a normal tin suspension, wait untilthe pole cools completely. then solder the thick lead or copper wire to connect the battery.