Look under battery connectors. I believe these are Andersons, and the connectors are avaialble for various wire gauge sizes. We usually solder rather than crimp.
Powerpoles come in several sizes. For the smaller ones (15/30/45 Amp size) an excellent source for a crimper is www.westmountainradio.com, look for their PWRCRIMP product.
If you’re asking about the battery-size connectors, I have nothing additional for you.