What black wire is it & the connector at the rice cooker?
The wire is called fixture wire it has a fiberglass looking outer braid and many times a very thin white Teflon type inner insulation. The size of the wire is based on the wattage of the cooker on the “spade” or disconnect that is a female and if in a hot area requires a high temp female crimp connector standard nickel plated copper may work but may not last long, the same with nickel plated copper splices when hot the copper may relax. It took me a few high temp repairs to find ~900 degree f crimp connectors, if you also posted about bad fuses a day or so ago I would solder the same as my other advice but in this case most insulation other than fiberglass/ high temp slide over will be the best option.