The discharge resistance of the discharge gun is usually 2kΩ, which is used for safe discharge after charging is completed. This resistance value is a standard value, which is used to identify the discharge state and ensure safety.
Detailed description:
The role of the discharge resistor:
The main function of the discharge resistor is to safely release the charge in the capacitor or other energy storage components in the charging gun after charging is completed, so as to avoid the residual charge from causing potential danger to the user or equipment.
Standard value:
The discharge resistance of the discharge gun is usually 2kΩ, which is a common standard value in the industry.
Discharge identification:
This resistance value is used in conjunction with other circuits in the charging gun to identify the discharge state. When the discharge resistor is connected to the circuit, the charging pile will be judged as a discharge state and start the discharge process.
Safety guarantee:
The existence of the discharge resistor ensures that after charging is completed, the charge in the gun has been safely released before the user pulls out the charging gun, avoiding accidents such as electric shock.
Different applications:
In addition to the standard discharge gun, there are some special applications, such as the BYD Qin PLUS EV’s on-board charger, whose discharge resistor may have other values, such as 1500Ω, depending on the specific circuit design and functional requirements.
Discharge identification resistor:
Some discharge guns also have a discharge identification resistor inside, which, together with the micro switch, can be used to confirm whether the discharge state has been entered after the charging gun is correctly connected.
Comparison table of resistance values of discharge guns in GB/T standards
The GB/T standard has strict requirements on the resistance value of discharge guns. The resistance value between CC and PE is used to control the matching of discharge power and vehicle to ensure the safety of electricity use.
Note: The discharge gun can only be used if the vehicle itself supports the discharge function.
According to Appendix A.1 on page 22 of GB/T 18487.4, the V2L control pilot circuit and control principle section of A.1 puts forward specific requirements for the voltage and current of discharge.
External discharge is divided into DC discharge and AC discharge. We usually use the convenient single-phase 220V AC discharge, and the recommended current values are 10A, 16A, and 32A.
63A model with three-phase 24KW output: discharge gun resistance value 470Ω
32A model with single-phase 7KW output: discharge gun resistance value 1KΩ
16A model with single-phase 3.5KW output: discharge gun resistance value 2KΩ
10A model with single-phase 2.5KW output: discharge gun resistance value 2.7KΩ
Post time: Jun-30-2025