Power battery management system, insulation resistance detection device and method for power battery

A technology of power battery and insulation resistance, applied in measuring devices, measuring resistance/reactance/impedance, measuring electricity, etc., can solve the problems of long detection time and low detection accuracy, and achieve the effect of shortening detection time and accurate detection

Active Publication Date: 2018-07-27
BEIJING ELECTRIC VEHICLE
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Problems solved by technology

[0002] At present, there are many methods for detecting the insulation resistance of power batteries in electric vehicles. For example, the bridge balance method can be used for insulation resistanc

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  • Power battery management system, insulation resistance detection device and method for power battery
  • Power battery management system, insulation resistance detection device and method for power battery
  • Power battery management system, insulation resistance detection device and method for power battery

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[0026] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0027] The following describes the insulation resistance detection device of the power battery, the power battery management system having the detection device, and the insulation resistance detection method of the power battery according to the embodiments of the present invention with reference to the accompanying drawings.

[0028] figure 1 It is a schematic block diagram of an insulation resistance detection device of a power battery according to an embodiment of the present invention. Such as figur...

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Abstract

The invention discloses a power battery management system, an insulation resistance detecting device and a method for a power battery. The detecting device comprises: a positive and negative bias resistor network, a positive and negative voltage detecting unit and a control unit. The control unit first controls the positive bias resistor network and the negative bias resistor network to be in an off state, and obtains the first positive insulation voltage V1 and the first negative insulation voltage V2 of the power battery through the positive voltage detection unit and the negative voltage detection unit. When V1 is greater than V2, the negative bias resistor network is first controlled to be in an on state, a second negative insulation voltage V2' is obtained, and then the positive biasresistor network is controlled to be in an on state. And the negative bias resistor network is controlled to be in an off state after the first preset time delay, the second positive insulation voltage V1' is obtained, and the positive and negative insulation resistance of the power battery is obtained according to V1, V2, V1' and V2'. The system not only enables accurate detection of the insulation resistance, but also shortens the detection time.

Description

technical field [0001] The invention relates to the technical field of power battery detection, in particular to a power battery insulation resistance detection device, a power battery management system with the detection device, and a power battery insulation resistance detection method. Background technique [0002] At present, there are many methods for detecting the insulation resistance of power batteries in electric vehicles. For example, the bridge balance method can be used for insulation resistance detection, but when this method is used for insulation resistance detection, if the design is not reasonable, it is easy to cause the detection The problem of low precision and long detection time. Contents of the invention [0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, the first object of the present invention is to provide an insulation resistance detection device for a power batt...

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Application Information

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IPC IPC(8): G01R27/02G01R31/36
CPCG01R27/02G01R31/3644
Inventor 赵营营代康伟付舜
Owner BEIJING ELECTRIC VEHICLE
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