Instead, you should use a proper solder and heat shrink tubing to repair the connection. This provides a secure electrical connection and protects it from the elements. If the terminal itself is damaged beyond repair, you will need to replace the entire terminal.
If you're not comfortable working with solder, it's best to take the car to a qualified auto electrician or repair shop. Improperly repairing the wiring could lead to further damage or even a fire.