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Online isolation resistance detection circuit for power battery

A technology of power battery and insulation resistance, which is used in high resistance measurement, measurement of resistance/reactance/impedance, components of electrical measuring instruments, etc. Insulation and other issues, to achieve the effect of meeting real-time online detection, performance safety, and high resistance accuracy

Inactive Publication Date: 2019-08-06
奇瑞新能源汽车股份有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] However, electric vehicles currently use small signal injection for the detection of power battery insulation resistance. This signal will cause ripple interference to the battery system and affect the system work.
The insulation resistance measurement accuracy of the existing external resistor switching is low, and the external resistor is connected for a long time, which reduces the system insulation and increases battery power consumption

Method used

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  • Online isolation resistance detection circuit for power battery
  • Online isolation resistance detection circuit for power battery
  • Online isolation resistance detection circuit for power battery

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Embodiment Construction

[0015] Referring to the accompanying drawings, through the description of the embodiments, the specific embodiments of the present invention include the shape, structure, mutual position and connection relationship of each part, the function and working principle of each part, and the manufacturing process of the various components involved. And the method of operation and use, etc., are described in further detail to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concepts and technical solutions of the present invention.

[0016] Such as figure 1 As shown, K1-K12 is a high-voltage switch composed of 6 dual-channel photoelectric relays, U1, U2, U3, and U4 are high common-mode differential operational amplifiers, R1, R2, R3 and R4, R5, R6 and R011, R012, R013 And R021, R022, R023 as voltage divider resistors; Rp is the insulation resistance of the positive electrode of the battery to the ground, and Rn is the insulation ...

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Abstract

The invention discloses an online isolation resistance detection circuit for a power battery. Anode and cathode of the power battery are connected with the input end of a resistance bleeder circuit, the output end of the resistance bleeder circuit is connected with the input end of a sampling calculation circuit, output of the sampling calculation circuit is connected to the input end of an MCU, and the output end of the MCU is connected to a CAN bus to send the grounding isolation resistance of the two ends of the power battery to a vehicle. A photoelectric relay switch, a voltage dividing resistor and a high common-mode voltage differential operation amplifier are used, the circuit is low in cost and power consumption, performances are save, the circuit can be used to accurately detect the isolation resistance of the power battery in different conditions, the collected isolation resistance is highly precise, and the circuit can meet requirement of real-time online detection of electromobile.

Description

technical field [0001] The invention relates to the field of electric vehicle safety, in particular to the technical field of power battery insulation resistance detection. Background technique [0002] With the rapid development of new energy vehicles, electric vehicles have become a means of transportation for consumers to travel, and personal safety is the first consideration for consumers, and the power battery of an electric vehicle is a high-voltage system, and its insulation is directly determined Whether electric vehicles can be used by consumers normally, so the insulation of electric vehicles is very important. [0003] However, electric vehicles currently use small signal injection for the detection of power battery insulation resistance. This signal will cause ripple interference to the battery system and affect the system work. The insulation resistance measurement accuracy of the existing external resistor switching is low, and the external resistor is connect...

Claims

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Application Information

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IPC IPC(8): G01R27/02G01R31/389G01R1/30
CPCG01R1/30G01R27/025G01R31/006G01R31/389
Inventor 夏洋堃宋开通曾祥兵赵欢欢朱晓东闫鹤何晶
Owner 奇瑞新能源汽车股份有限公司
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