[Question 1] The temperature of the car charger is too high, causing damage to the car charger.
problem analysis:
The charger and the socket are poorly matched, the connection is too loose, and the on-resistance is too large;
The car chargers and sockets of different manufacturers do not cooperate well;
The shell material is not resistant to high temperature;
There is no thermostat.
Measure:
1. The new standard requires a temperature detection function. At present, the detection position and over-temperature protection point are not clearly defined; the car charger is equipped with over-temperature protection, and at the same time, after the car is fully charged, it will actively disconnect the power supply to prevent the battery from being overcharged.
2. In terms of terminal material selection, terminal and cable connection process, and cable specifications, more energy needs to be invested in research and demonstration. Only by solving the problem of temperature rise in essence, coupled with a temperature monitoring device, can the temperature of the car charger be kept within a controllable range when charging.
[Question 2] The inner part of the charging cable is broken, the insulating skin is worn, cracked, and the insulation is lowered; the car charger casing is damaged and leaks.
problem analysis:
The design of the charging cable is unreasonable, and the internal thin wire is broken when the charging cable is wound; the external insulating material of the charging cable has insufficient wear resistance and temperature resistance; the shell strength and elasticity are insufficient.
Measure:
1. Specify the electric shock protection requirements for power supply plugs, power supply sockets, vehicle plugs, and vehicle sockets; it is recommended to use protection devices with overvoltage and undervoltage protection, lightning protection, output short-circuit protection, leakage protection and overcurrent protection, and there is leakage inside. The protector will trip in time if there is leakage during standby or charging.
2. The charging line manufacturers have improved in terms of technology, structure, materials, etc.;
3. Considering that the user accidentally crushed the charging gun. There is a risk of electric shock when charging with this gun. Therefore, the shell of the charging gun should be made of materials with high strength, elastic coefficient, and high impact strength, so as not to cause safety accidents due to mechanical damage.
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