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Insulation resistance detection circuit and method of electric automobile power battery, and electric automobile

A technology for power batteries and electric vehicles, applied in the direction of impedance measurement, etc., can solve problems such as aging of insulating parts, high potential, electric shock, etc., and achieve the effect of satisfying safety performance and personnel safety, easy method, and simple circuit structure

Inactive Publication Date: 2016-10-26
CH AUTO TECH CORP CO LTD
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Problems solved by technology

[0003] After long-term use of electric vehicles, the insulating parts of high-voltage components will slowly age. When encountering a humid environment, the insulation performance between the high-voltage circuit and the body ground (frame) will decrease, and the positive and negative poles of the power supply will be A large leakage current is formed through the body ground, which will force the potential of the body ground to be pulled up (that is, the potential of the frame is pulled up). This situation will not only cause adverse effects on the low-voltage electrical components on the car In addition, it will also pose a threat to the personal safety of passengers, or even get an electric shock.

Method used

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  • Insulation resistance detection circuit and method of electric automobile power battery, and electric automobile
  • Insulation resistance detection circuit and method of electric automobile power battery, and electric automobile
  • Insulation resistance detection circuit and method of electric automobile power battery, and electric automobile

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Embodiment Construction

[0082] In order to have a clearer understanding of the technical features, purposes and effects of the invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals represent the same parts.

[0083] In this article, "schematic" means "serving as an example, example or illustration", and any illustration or implementation described as "schematic" should not be interpreted as a more preferred or more advantageous Technical solutions.

[0084] In order to make the drawings concise, the figures in each figure only schematically show the relevant parts of the present invention, and do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is marked.

[0085] Herein, "one" does not m...

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Abstract

The invention discloses an insulation resistance detection circuit of an electric automobile power battery, an insulation resistance detection method of an electric automobile power battery, employing the circuit, and an electric automobile. According to the technical scheme, grounding insulation resistance values of an anode and a cathode of the power battery are measured by use of a bridge measurement method, different determination and processing are performed on the measured different insulation resistance values through making corresponding electric leakage emergency strategies, and the safety performance when an automobile is normal and the demand for personnel safety are satisfied. The circuit structure is simple, and the method is easily implemented.

Description

technical field [0001] The invention relates to the field of detection of electric vehicles, in particular to an insulation resistance detection circuit for a power battery of an electric vehicle, a method for detecting insulation resistance of a power battery of an electric vehicle, and an electric vehicle using the circuit and the method. Background technique [0002] An electric vehicle uses a power battery pack as an energy source to drive a motor to drive the vehicle. The power voltage of electric vehicles in daily life is above 36V (volts), and some even reach hundreds of volts, which is far beyond the safe voltage range of the human body. In order to achieve the purpose of safety, the power system of electric vehicles must have a very stable and reliable insulation resistance. Insulation resistance is the most basic indicator of insulation performance of electrical equipment and electrical lines on electric vehicles. Good insulation performance can ensure the safe an...

Claims

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Application Information

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IPC IPC(8): G01R27/18
CPCG01R27/18
Inventor 陆群黄永强
Owner CH AUTO TECH CORP CO LTD
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