Battery insulation resistance detection method, device and system

A technology of insulation resistance and detection method, which is applied in the direction of measurement device, measurement of resistance/reactance/impedance, measurement of electricity, etc., can solve the problems of increasing the power consumption of the battery system, low detection accuracy, reducing the insulation performance of the battery system, etc., to simplify the measurement. and the calculated effect

Active Publication Date: 2021-04-20
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The detection process of this measurement method is cumbersome and the detection accuracy is low. At the same time, due to the long-term access to the measurement resistor, the insulation performance of the battery system is reduced and the power consumption of the battery system is increased.

Method used

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  • Battery insulation resistance detection method, device and system
  • Battery insulation resistance detection method, device and system
  • Battery insulation resistance detection method, device and system

Examples

Experimental program
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Effect test

Embodiment 1

[0076] figure 1 It is a flow chart of a battery insulation resistance detection method provided by Embodiment 1 of the present invention. This embodiment is applicable to the detection of battery insulation resistance, and the method can be executed by a battery insulation resistance detection device, such as figure 1 As shown, the method specifically includes the following steps:

[0077] S110. Control the insulation detection relay to close according to the high voltage state on the vehicle;

[0078] in, figure 2 It is a working principle diagram of the battery insulation resistance detection circuit provided by Embodiment 1 of the present invention, as shown in figure 2 As shown, the battery insulation resistance detection circuit includes an insulation detection relay K1 and an insulation detection variable resistor R; the first end of the insulation detection relay K1 is electrically connected to the first end of the insulation detection variable resistor R, and the s...

Embodiment 2

[0119] The power supply insulation resistance detection device provided in Embodiment 2 of the present invention can execute the power supply insulation resistance detection method provided in Embodiment 1 of the present invention, and has corresponding functional modules and beneficial effects for executing the method. Figure 4 It is a schematic structural diagram of the power insulation detection device provided by Embodiment 2 of the present invention, as shown in Figure 4 As shown, the device includes:

[0120] Relay closing module 10: used to control the closing of the insulation detection relay according to the high voltage state on the vehicle;

[0121] The first resistance value acquisition module 20: used to acquire the first resistance value of the insulation detection variable resistor;

[0122] The first voltage value acquisition module 30: used to acquire the first voltage value of the main positive terminal and the first voltage value of the main negative term...

Embodiment 3

[0150] The embodiment of the present invention also provides a battery insulation resistance detection system. Since the system can be applied to the battery insulation resistance detection method and also has the beneficial effects of the first embodiment above, it will not be repeated here. The system includes an insulation detection relay, an insulation detection variable resistor, a voltage sensor and a controller; the controller includes the battery insulation resistance detection device described in the second embodiment above;

[0151] The first terminal of the insulation detection relay is electrically connected to the first terminal of the insulation detection variable resistor, and the second terminal of the insulation detection relay is the ground terminal; the second terminal of the insulation detection variable resistor is respectively connected to the first terminal of the insulation resistance of the main positive terminal. terminal and the first terminal of the ...

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Abstract

The invention discloses a battery insulation resistance detection method, device and system. The detection method comprises the following steps: controlling an insulation detection relay to be closed according to a high-voltage state on a whole vehicle; obtaining a first resistance value of the insulation detection variable resistor; after a first preset time, obtaining a first voltage value of the main positive end and a first voltage value of the main negative end; adjusting the resistance value of the insulation detection variable resistor; obtaining a second resistance value of the insulation detection variable resistor; after second preset time, obtaining a second voltage value of the main positive end and a second voltage value of the main negative end; and calculating the insulation resistance of the main positive end and the insulation resistance of the main negative end according to the first resistance value of the insulation detection variable resistor, the first voltage value of the main positive end, the first voltage value of the main negative end, the second resistance value of the insulation detection variable resistor, the second voltage value of the main positive end and the second voltage value of the main negative end/ Simplified measurement and calculation of insulation resistance detection are realized.

Description

technical field [0001] Embodiments of the present invention relate to insulation resistance detection technology, in particular to a battery insulation resistance detection method, device and system. Background technique [0002] With the popularization of new energy vehicles and the increasing application of electric vehicles, the safety of automobiles has also received more and more attention. Generally, the prolongation of the service life of the power battery, and the aging of the power battery itself or its connecting wires are likely to cause problems with the insulation between the power battery and the vehicle body. [0003] At present, there are two methods for detecting the insulation resistance of electric vehicles in my country. One is to use the signal injection method to measure, and the other is to use external resistance switching to measure. The method of signal injection refers to injecting a DC voltage signal of a certain frequency into the battery system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/385G01R31/389G01R27/02
CPCY02T10/70
Inventor 张芳刘丙龙时艳茹张佳骥夏萍李强
Owner WEICHAI POWER CO LTD
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