Electric automobile insulation impedance detection method

A technology of electric vehicles and detection methods, which is applied in the directions of grounding resistance measurement, very high resistance measurement, resistance/reactance/impedance measurement, etc. It can solve problems such as interference injection signals, small current value, and potential safety hazards, and meet the requirements of system design. requirements, simple circuit structure and reliable operation

Inactive Publication Date: 2018-08-14
山东魔方新能源科技有限公司
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Problems solved by technology

Among them, the megohmmeter measurement method needs to generate a high-voltage excitation, which will bring additional safety hazards when the battery is working
For the AC signal injection method, because of the complex load and working conditions of the power battery in electric vehicles, there will be a lot of noise and spikes at both ends of the battery, which will greatly interfere with the acquisition of the injected signal, and finally make the measurement of the insulation resistance fluctuate greatly. , and the

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  • Electric automobile insulation impedance detection method
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Embodiment Construction

[0034] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] The electric vehicle insulation resistance detection method of a preferred embodiment of the present invention, comprises the following steps:

[0036] S1: Connect the positive electrode of the electric vehicle power battery to the body ground through the switch KG0, resistor R1, and resistor R2 in sequence, and connect the negative electrode of the electric vehicle power battery to the body ground through the switch KG4, resistor R4, and resistor R3 in sequence;

[0037] S2: Connect resistor R5 and switch KG2 in parallel at both ends of the line where resistor R1 and resistor R2 are located, resistor R5 and switch KG2 are connected in series, connect resistor R6 an...

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Abstract

The invention relates to an insulation impedance detection method for an electric automobile, and directly calculating the insulation resistance value of the positive and negative poles of the power battery of the electric vehicle on the vehicle body. The original detection circuit is connected with a resistor between a positive bus and a negative bus of the power battery pack, the insulation performance of the vehicle body is reduced by the access of the detection device, and the self-discharge rate of the battery can be increased.; a high-voltage isolating switch is adopted for controlling the positive and negative bus ends of the power battery, the detection resistor is not introduced when the insulation detection is not carried out, and adverse effects on the vehicle body are avoided.The electric automobile insulation impedance detection method is simple to operate and can accurately and effectively detect the insulation resistance.

Description

technical field [0001] The invention relates to an impedance detection method, in particular to an electric vehicle insulation impedance detection method. Background technique [0002] Electric vehicles are complex mechatronic products, many of which include power batteries, motors, chargers, energy recovery devices, auxiliary battery charging devices, etc. will involve high-voltage electrical insulation problems. The working conditions of electric vehicles are relatively harsh. Vibration, corrosion of acid and alkali gases, changes in temperature and humidity may cause rapid aging of power cables and other insulating materials or even damage to insulation, greatly reducing the insulation strength of equipment and endangering personal safety. The insulation performance of the DC system directly affects the reliability of the DC circuit. If two-point grounding occurs in the DC system, it may cause serious consequences. At present, the main insulation resistance measurement m...

Claims

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Application Information

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IPC IPC(8): G01R31/36G01R27/02G01R27/20G01R31/00
CPCG01R27/025G01R27/20G01R31/007G01R31/389G01R31/396
Inventor 华周发蒋中林
Owner 山东魔方新能源科技有限公司
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