High-voltage safety control system and method of electric vehicle power system

Abstract

The invention discloses a high-voltage safety control system and method of an electric vehicle power system. In the control system, a first contactor, a second contactor, a first manual maintenance switch and a second manual maintenance switch are electrically connected with a whole vehicle controller, the positive electrode of a first energy storage unit is connected with the positive electrode of electric equipment through a normally-opened contact of the first contactor, the negative electrode of the first energy storage unit is connected with the negative electrode of the electric equipment through the first manual maintenance switch, the positive electrode of a second energy storage unit is connected with the positive electrode of the electric equipment through a normally-opened contact of the second contactor, the negative electrode of the second energy storage unit is connected with the negative electrode of the electric equipment through the second manual maintenance switch, and energy storage unit management systems used for controlling the energy storage units are controlled by the whole vehicle controller. The two manual maintenance switches are additionally arranged in a high-voltage loop, so that when the contactors are stuck and lose efficacy, high-voltage electricity is disconnected safely, the redundancy of high-voltage disconnection control is improved, and safety of maintainers is ensured.

Description

technical field [0001] The invention relates to the technical field of electric vehicle safety control, in particular to a high-voltage safety control system and a control method of the electric vehicle power system. Background technique [0002] figure 1 A schematic structural diagram of a high-voltage control system of an electric vehicle power system in the prior art is shown, as figure 1 As shown, the solid line in the figure represents the power main wiring of the power system, and the dotted line represents the control signal line. The power system is a plug-in power system, and the power system uses a dual-voltage platform energy storage system, that is, the energy storage system includes a power battery group 71, a supercapacitor group 81, and a power battery group management system 72 for controlling the power battery group 71 and a supercapacitor group management system 82 for controlling the supercapacitor group 81. [0003] The high-voltage control system of th...

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is: because the high-voltage control system of the electric vehicle power system in the prior art does not have other high-voltage circuit safety disconnection schemes other than the on-off contactor, so when the high-voltage contactor is in the state of sticking failure , will cause the high-voltage circuit to be disconnected uncontrollably and safely, so that the high-voltage circuit cannot be cut off during high-voltage faults and maintenance, and the safety of the vehicle system and personnel cannot be guaranteed.

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