When charging lithium batteries, the problems with copper melting right after plugging in are as follows:
1. The internal structure of the socket has fine wires and is overloaded.
2. The wires and plugs are in loose contact, and poor contact causes the copper sheets to overheat and melt.
3. The charging current of the lithium battery is relatively large. If the plug and socket have poor contact, contact resistance will form.
4. When current passes through, heat or discharge will be generated, causing copper sheets to melt at high temperature.