Relay inner and outer insulation resistance value acquisition method and device

Abstract

The embodiment of the invention provides a relay inner and outer insulation resistance value acquisition method and device. The method comprises steps: an insulation resistance value acquisition circuit is controlled to output low-frequency AC signals; when both a main relay and a pre-charge relay are cut off, based on the low-frequency AC signals, the inner insulation resistance value of the mainrelay is acquired; when the inner insulation resistance value of the main relay is normal, the pre-charge relay is controlled to be closed; and when the main relay is cut off and the pre-charge relayis closed, based on the low-frequency AC signals, the outer insulation resistance value of the main relay is acquired. Thus, the technical scheme provided by the embodiment of the invention can acquire the inner and outer insulation conditions of the main relay so as to solve the problems that the inner and outer insulation conditions of the main relay cannot be acquired when the main relay is cut off in the prior art and the safety risk is further caused.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of insulation technology, in particular to a method and device for obtaining the insulation resistance value of the inner and outer sides of a relay. [0003] 【Background technique】 [0004] The replacement of fuel vehicles by electric vehicles has become the development trend of the automobile industry. The mileage, service life and safety of power batteries are all very important to the use of electric vehicles. As one of the evaluation indicators of safety performance, insulation performance is an indispensable testing item in power batteries. [0005] The main relay includes a main positive relay and a main negative relay, wherein the main positive relay is a relay connected to the positive main circuit of the battery pack, the main negative relay is a relay connected to the negative main circuit of the battery pack, and the main positive relay and the main negative relay Loads can be connected between th...

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Problems solved by technology

[0008] In view of this, the embodiment of the present invention provides a method and device for obtaining the insulation resistance value of the inner and outer sides of the relay, which is used to obtain the insulation conditions of the inner and outer sides of the main relay, so as to solve the problem that the main relay cannot be obtained in the prior art when the main relay is disconnected. The problem of obtaining the outer insulation of the main relay and the further safety risk problems caused

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