Soldering should work. Those tabs are welded to the cells, but intended for you to solder them at the far end either to each other or into a PC board. The batteries will see the least heat if you get the tabs very clean and use a hot tinned iron quickly, like several seconds of actual heating. No thermal runaway problem with NiMH, but too much heat can cause them to leak corrosive electrolyte gradually later or just dry out sooner than they should. If you have the space leave the tabs full length and just solder pairs of them together at the very end then insulate. Only problem with tabs that I know is when they are very short from salvaged batteries, the soldering too prolonged, and the particular batteries have lithium inside, which your V150H NiMH cells will not.