Electric Vehicle Cable Performance Characteristics

Power Line & Motor Line

1. These two parts are the core parts of the electric vehicle wiring harness. Before the power supply harness is produced, the current allowable current value is 15a or less, including 15a, and the cross-sectional area of the copper wire is 1.5 square millimeters, and the current value of the motor wire. Larger, reaching 15a or more, below 22a, the cross-sectional area of the copper wire is 2.0 square millimeters.

2. Control the lock line of weak electricity. Here, the current intensity of the wire harness is not large, and is 1.0a to 3.0a, so that a cross-sectional area of 0.5 mm 2 is sufficient.

3. Light, horn, alarm harness. The electronic horn is a warning sound component for safe driving, and the horn used in the electric vehicle is almost always active. Similarly, after thorough research with the customer, the data given is a current intensity of 1.0a-3.0a, so the cross-sectional area is 0.5 square millimeters.

4. Data communication harness. Here, the amount of current that the wire harness is allowed to pass is small, 0.5a or less, and the wire diameter is 0.24 square millimeters. Obviously, such a match is sufficient for signal transmission of various components of the electric vehicle.

Generally speaking, if the wire diameter is above the value specified above, the resistance of the wire harness is too large, and the voltage on the wire harness will be large when the large current such as the starter car passes, which can reach 2v or more, causing the controller to enter the undervoltage prematurely. protection. Let us take 36v as an example. When the cross-sectional area of the wire harness is too small, its internal resistance is increased, which is equivalent to connecting a resistor in series. When the battery voltage is 36v, when there is more than 15a, if the internal resistance of the wire harness exceeds 0.1 ohm according to Ohm's law, the upper pressure will reach 2v, the voltage supplied to the controller is only 34v; when the battery voltage drops to 33v At this time, the voltage supplied to the controller is only 31v, and the controller enters undervoltage protection, but the battery is not fully discharged.