Relay high-voltage end adhesion processing method

Abstract

The invention discloses a relay high-voltage end adhesion processing method which comprises the following steps: when a relay is not closed, detecting whether an adhesion fault occurs in a high-voltage loop of a battery system; if it is detected that an adhesion fault occurs between the main relay and the negative relay, after multiple times of power-on and power-off operation is conducted on the vehicle, if the fault still does not return to be normal, when the vehicle is in a static state, connection and disconnection of a low-voltage power supply loop of the main relay and the negative relay are controlled according to preset frequency, and if the fault still does not return to be normal, fault information is prompted. If it is detected that an adhesion fault occurs between the direct-current positive relay and the direct-current negative relay, when the vehicle is in a static state, on-off of a low-voltage power supply loop of the direct-current positive relay and the direct-current negative relay is controlled according to a preset frequency, and if the fault does not return to normal, fault information is prompted. According to the method, the probability of electrification of the high-voltage output port caused by slight adhesion of the high-voltage end of the relay due to abnormity can be greatly reduced, and the probability that the whole vehicle cannot be used due to micro adhesion can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a method for treating adhesion at a high-voltage end of a relay. Background technique [0002] With the increase in the use of new energy vehicles, more problems with new energy vehicles have been exposed on the market. Among them, the high-voltage end of the relay is generally stuck, including the battery main circuit relay and the DC charging circuit relay. If the high-voltage circuit relays are all slightly stuck due to a fault, and the high-voltage circuit insurance is not blown, it will lead to high-voltage electricity at the output end of the high-voltage circuit, and it is understood that the new energy vehicles are gradually canceling the maintenance switch of the high-voltage circuit. Some models have implemented the cancellation plan. In this case, if the relay sticks, it will cause certain safety hazards to the maintenance personnel and even the car users. ...

AI Technical Summary

Problems solved by technology

If the high-voltage circuit relays are all slightly stuck due to a fault, and the high-voltage circuit insurance is not blown, it will lead to high-voltage electricity at the output end of the high-voltage circuit, and it is understood that the new energy vehicles are gradually canceling the maintenance switch of the high-voltage circuit. Some models have implemented the cancellation plan. In this case, if the relay sticks, it will cause certain safety hazards to the maintenance personnel and even the car users. At the same time, if there is a relay sticking failure, it is generally impossible to start the whole vehicle, and only the trailer can be repaired. , causing a certain impact on the user's use of the car

like figure 1 As shown in the high-voltage circuit of the battery system, there are abnormalities in the high-voltage circuit of the battery system, such as insufficient pre-charging, instantaneous overload of the high-voltage circuit current, etc., which cannot cause the fuse to blow out, resulting in adhesion at the high-voltage end of the relay. If the main positive relay and If the main and negative relays are stuck at the same time, the voltage at the two points AB is the battery voltage, and there is a certain risk in the maintenance of personnel; if under the above circumstances, the DC positive relay and the DC negative relay are stuck at the same time, it will lead to the two-point voltage of CD The battery voltage, the DC port is exposed, and the risk is higher; and the vehicle is generally prohibited from being used in the above situation, the vehicle cannot be driven, and the high-voltage interface has a high-voltage risk

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