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Detection device for high-voltage residual electricity after electric vehicles are powered off

A technology of electric vehicles and detection devices, which is applied in the direction of measuring devices, measuring current/voltage, measuring electricity, etc., can solve the problems of large test devices, inability to judge the residual power of high-voltage components, and inconvenient inspection, so as to reduce common mode Interfering effects, avoiding the effect of displaying the risk of errors

Active Publication Date: 2019-02-22
BEIJING ELECTRIC VEHICLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of the detection method of the power voltage of the traction battery of the electric vehicle in the above-mentioned prior art are: the cost of this method is high, the test device is bulky, and the display is located on the instrument panel. During inspection and maintenance, it is necessary to use a multimeter to measure whether there is still high voltage on the high-voltage bus.
It is inconvenient for maintenance personnel to check during maintenance
When the vehicle is powered on at high voltage, the current value of the vehicle’s high voltage can be read from the instrument panel, but when the vehicle is powered off at high voltage, the instrument panel does not work, and it is impossible to judge whether there is any residual power in the high-voltage components

Method used

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  • Detection device for high-voltage residual electricity after electric vehicles are powered off
  • Detection device for high-voltage residual electricity after electric vehicles are powered off
  • Detection device for high-voltage residual electricity after electric vehicles are powered off

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Embodiment 1

[0041] In practical applications, users or maintenance personnel are more concerned about whether the power battery is normally powered on at high voltage, whether there is residual power after the vehicle is powered off, and whether the residual power has a high voltage exceeding the safe voltage of the human body of 36V.

[0042] The embodiment of the present invention adopts the voltage dividing resistance method to collect the power voltage of the electric vehicle, and judges the voltage range of the power voltage, without measuring the specific numerical value of the power voltage. The detection device for high-voltage residual electricity after the electric vehicle is powered off in the embodiment of the present invention can judge whether there is residual electricity in the high-voltage system (mainly the high-voltage DC input terminal of each high-voltage component) when the power battery of the electric vehicle is powered off. Electricity present in the capacitor).

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Embodiment 2

[0069] Based on the detection device of the first embodiment above, the schematic diagram of the detection process of a detection device for high-voltage residual electricity after the electric vehicle is powered off provided by this embodiment is as follows Figure 7 As shown, including the following detection process:

[0070] The bus power voltage state of the traction battery can be divided into three states: power-on state (v HV >250V), discharge state (36VHV HV <36V):

[0071] R6 and R7 are voltage divider resistors. In this detection device, R7 is a precision resistor with a resistance value of 1K, and R6 is a precision resistor with a resistance value of 11.5k. R7 / (R6+R7)=1 / 12.5, so the voltage on R7 This drops to 4.5 / 12.5 = 0.36V. When the negative input terminal of U4 is greater than 0.36V (corresponding to the residual power of the high-voltage system is greater than 36V), U4 outputs a low level, and when the negative input terminal of U4 is less than 0.36V (corre...

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Abstract

The embodiment of the invention provides a device for detecting high-voltage residual electricity of a discharged electric car. The device is arranged in a high-voltage control box of the electric car and comprises a high-voltage collection circuit, a voltage comparison circuit and a display circuit which are connected with one another in series, wherein the voltage comparison circuit is also electrically connected with a reference voltage circuit. The detection device can be used for detecting whether a whole car high-voltage system has residue electricity after a storage battery is discharged by comparing the collected voltage value with the reference voltage instead of collecting an actual voltage value of power voltage of the electric car; the detection device does not adopt the AD sampling circuit design scheme or a microprocessor, which take an excellent effect of reducing the influence of common-mode interference on power wire harness, so that the risk of wrong display caused because of the interference of a CAN network can be avoided.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a detection device for high-voltage residual electricity after the electric vehicle is powered off. Background technique [0002] Pure electric vehicles use power batteries and drive motors as power devices. The working voltage is as high as hundreds of volts, far exceeding the human body safety voltage of 36V. The aging of the line or the damage of the insulation may cause electric shock. Therefore, it is a very critical link to detect the power voltage of the power battery of the electric vehicle. [0003] At present, a detection method of the dynamic voltage of the traction battery of an electric vehicle in the prior art is: setting a detection point of the dynamic voltage of the traction battery of the electric vehicle in the traction battery pack, and collecting the voltage at the above detection point through the AD sampling circuit , send the collected power vol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R19/165
Inventor 高新杰李兴华
Owner BEIJING ELECTRIC VEHICLE