Why Does the Charging Cable of New Energy Vehicles Get Hot?

[DiMelanie]

There are generally several situations where the charging plug of a new energy vehicle gets hot during charging. Here is a detailed analysis: 1. Loose plug and oxidized contact surface: A loose plug and oxidized contact surface can lead to poor contact during charging. If there is loose contact at the connection point during charging, the voltage between the contact points can be enough to break down the air gap, forming an arc and sparking, which may ignite nearby flammable materials and cause a fire. If the charging port is not securely connected, poorly maintained, or has been in operation for a long time, an oxide film that conducts poorly may form at the connection point. Oxidation of the charging plug can easily lead to excessive contact resistance, causing the plug to overheat. 2. Issues with the charging port's electronic lock: Regarding the charging port, the model and size are standardized, and the vehicle's charging port has corresponding safety requirements for current, etc. The charging port should be equipped with an electronic locking device to prevent accidental disconnection during charging. If the electronic lock is not securely engaged, the charging port may continue to charge, leading to overheating. 3. Quality issues with the charging port: Due to different materials of the battery cells, the charging port may heat up when the current is too high. However, different materials have varying heat dissipation properties. If the material is of poor quality, it may result in poor heat dissipation, leading to overheating.