High-voltage power-on method and electric vehicle

Abstract

The invention provides a high-voltage power-on method and an electric vehicle, and relates to the technical field of electric vehicles. The method comprises the following steps: after the open circuit of a pre-charging relay or the open circuit of a main negative relay is determined for the first time, trying to close the pre-charging relay for multiple times or trying to close the main negative relay for multiple times; after it is determined that pre-charging succeeds and the external circuit of the power battery is not short-circuited, diagnosing whether a main positive relay is open-circuited or not for the first time; and after the open circuit of the main positive relay is determined for the first time, trying to execute a part of high-voltage power-on flow for multiple times, and after the open circuit of the main positive relay is determined not, sending a signal indicating that the high-voltage power-on flow is finished to the vehicle control unit. According to the high-voltage power-on method, the problem that the whole vehicle cannot be powered on to report the fault due to the fact that the coil of the relay is powered on accidentally and does not act is effectively solved, and the user experience is greatly improved. The risk of short circuit of an external circuit of a power battery is effectively intercepted, so that the safety of the whole vehicle and people is improved. The high-voltage power-on method disclosed by the invention has relatively high practicability.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a high-voltage electrification method and the electric vehicle. Background technique [0002] At present, in order to improve the battery life of electric vehicles, the capacity and voltage level of power batteries are getting higher and higher, and high-voltage safety has become a key focus in the field of electric vehicles. In addition, in order to improve the user experience, the entire process of high-voltage power-on needs to take a short time. At this stage, there are many methods of high-voltage power-on. While ensuring the high-voltage safety of electric vehicles, the time used for high-voltage power-on is shortened as much as possible. [0003] Due to the differences in the consistency of current relay products, the relay coil will occasionally fail to act when it is powered on, resulting in the failure of the vehicle to be powered on, and the failure to power...

AI Technical Summary

Problems solved by technology

[0003] Due to the differences in the consistency of current relay products, the relay coil will occasionally fail to act when it is powered on, resulting in the failure of the vehicle to be powered on, and the failure to power on needs to be repaired by a tow truck, which brings a very poor experience to users. The high-voltage power-on method does not have a good solution to this problem

In addition, the current high-voltage power-on method cannot well intercept the risk of a short circuit in the external circuit of the power battery (that is, a short circuit of the load). It may cause the power battery to catch fire and burn, endangering the safety of the whole vehicle and personal

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