A battery pack insulation resistance detection circuit and device, battery management device
A technology of insulation impedance and detection circuit, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve the problems of inaccurate sampling and low accuracy of insulation impedance, improve accuracy, solve inaccurate sampling, reduce The effect of deviation
Active Publication Date: 2021-01-08
CONTEMPORARY AMPEREX RUNZHI SOFTWARE TECH LTD NINGDE CITY
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Problems solved by technology
[0005] In view of this, the embodiment of the present invention provides a battery pack insulation resistance detection circuit and device, and a battery management device, which are used to solve the problem of low-voltage sampling in the low-frequency injection circuit caused by the voltage fluctuation of the battery pack in the prior art to a certain extent. Problems leading to inaccurate sampling and consequently lower accuracy of insulation resistance
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[0048] In order to better understand the technical solutions of the present invention, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0049] It should be clear that the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0050] Terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a", "said" and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.
[0051]It should be understood that the term "and...
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Embodiments of the present invention provide a battery pack insulation resistance detection circuit and device, and a battery management device. In the embodiment of the present invention, the battery pack insulation impedance detection circuit, wherein the battery pack includes a plurality of battery cells; includes: a low-frequency signal injection circuit, used to inject a low-frequency signal, and used to obtain the insulation of the battery pack according to the low-frequency signal The impedance includes a low-frequency signal injection end; the low-frequency signal injection end is connected between any two adjacent battery cells connected in series in the battery pack. Therefore, the technical solution provided by the embodiments of the present invention can solve the problem of inaccurate sampling in the prior art due to the voltage fluctuation of the battery pack affecting the low-voltage sampling in the low-frequency injection circuit and the resulting low accuracy of the insulation resistance. question.
Description
【Technical field】 [0001] The invention relates to the technical field of batteries, in particular to a battery pack insulation resistance detection circuit and device, and a battery management device. 【Background technique】 [0002] The replacement of fuel vehicles by electric vehicles has become the development trend of the automobile industry. The mileage, service life and safety of battery packs are all very important for the use of electric vehicles. The battery pack is one of the key components of electric vehicles, and the safety of its high voltage is the primary consideration of the power battery system. Therefore, testing the insulation performance of the battery pack in electric vehicles is an essential part of the design. [0003] At present, the detection of insulation resistance is generally obtained by injecting low-frequency AC signals at the positive or negative poles of the battery pack, collecting the voltage signals on both sides of the sampling components...
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IPC IPC(8): G01R31/389
CPCG01R31/3644G01R31/389
Inventor 但志敏张伟侯贻真李盟孙卫平余腾
Owner CONTEMPORARY AMPEREX RUNZHI SOFTWARE TECH LTD NINGDE CITY