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Electric vehicle power battery insulation resistance detection method and device

A technology of insulation resistance and power battery, applied in the direction of measuring device, measuring resistance/reactance/impedance, measuring electricity, etc., can solve the problem of being unable to locate the location of leakage, and achieve the effect of eliminating inaccurate detection

Active Publication Date: 2011-12-28
QIMING INFORMATION TECH +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention discloses a method for detecting the insulation resistance of a power battery of an electric vehicle, which can determine the current leakage state of the power battery through the variation of the insulation resistance sampling voltage, and solves the problem that the traditional insulation resistance detection cannot locate the leakage position

Method used

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  • Electric vehicle power battery insulation resistance detection method and device
  • Electric vehicle power battery insulation resistance detection method and device
  • Electric vehicle power battery insulation resistance detection method and device

Examples

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Embodiment 1

[0034] like figure 1 Shown: The power battery insulation resistance detection device is mainly composed of a microcontroller (MCU-Micro Control Unit), a positive insulation switch circuit, a negative insulation switch circuit, an operational amplifier circuit, a voltage isolation circuit, and a CAN-Controller Area Network. ) Transceiver and LCD display. Among them, the GPIO-General Purpose Input Output (GPIO-General Purpose Input Output) module 1 of the MCU is externally connected to the control terminal of the positive insulated optocoupler relay, and the GPIO module 2 of the MCU is connected to the control terminal of the negative insulated optocoupler relay. Select the conduction logic to output the insulation resistance sampling voltage. After the insulation resistance sampling voltage is processed by the operational amplifier circuit, it enters the voltage isolation circuit for voltage isolation processing. Finally, input to the analog-to-digital conversion (AD-Analog-...

Embodiment 2

[0036] like figure 2As shown: the positive insulation switch circuit is mainly composed of a positive voltage divider circuit and a positive insulation optocoupler relay. When the control terminal VHP_KEY of the positive insulation optocoupler relay outputs a low level, a path is formed between pin 1 and pin 2 of the relay, so that pin 7 and pin 8 of the relay are turned on, and resistors R0~R7 and R16 form a positive voltage divider circuit. Pin 7 outputs a positive insulation resistance sampling voltage value.

[0037] The negative pole insulation switch circuit is mainly composed of a negative pole voltage divider circuit and a negative pole insulation optocoupler relay. When the control terminal VHN_KEY of the negative insulation optocoupler relay outputs a low level, a path is formed between pin 3 and pin 4 of the relay, so that pin 5 and pin 6 of the relay are turned on, and resistors R8~R15 and R17 form a negative voltage divider circuit. Pin 6 outputs a negative i...

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Abstract

The invention discloses a method and a device for detecting power battery insulation resistance of an electric automobile. Two circuits of universal input / output interfaces of a micro-controller are respectively and externally connected with positive and negative insulation switch circuits. Positive and negative insulation switch relays are gated. Insulation resistance sampling voltage is output. The sampling voltage is amplified by an operational amplifying circuit, isolated by a voltage isolation chip and input in an analogue-digital conversion unit of the micro-controller. An insulation resistance value of a current power battery is calculated by the micro-controller according to an algorithm, transmitted to a battery management system through a communication module in the form of message and used by the battery management system. According to the method and the device disclosed by the invention, the problem that positive leakage, positive leakage or positive and positive leakage cannot be judged by the traditional insulation resistance detection device is effectively solved; the leakage degree of the current power battery can be precisely measured; and potential safety hazards resulted from inaccuracy of the insulation resistance are stopped.

Description

technical field [0001] The invention discloses a method for detecting the insulation resistance of a power battery of an electric vehicle, and also provides a device for realizing the method, belonging to the field of new energy electric vehicles. Background technique [0002] The energy of electric vehicles mainly comes from the on-board power battery. Since the power battery is generally more than several hundred volts, if an accidental leakage occurs, it will directly threaten personal safety. Therefore, electric vehicles need a device that can detect the insulation resistance of power batteries in real time. At the same time, an excellent power battery insulation resistance detection method is also the most important performance index for evaluating an electric vehicle. The traditional power battery insulation resistance detection method can only determine whether the current power battery is in a leakage state, but cannot determine whether the power battery is leaking...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02G01R31/36
Inventor 吴畏朱庆林姜鹏董冰黄敏
Owner QIMING INFORMATION TECH
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