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Battery system fault diagnosis method

A battery system and fault diagnosis technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of inaccurate judgment and narrow application range, and achieve the effect of improving battery safety performance and rapid battery fault diagnosis.

Active Publication Date: 2020-06-09
HEFEI UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a battery system fault diagnosis method, which solves the problems of narrow application range and inaccurate judgment in the prior art

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Embodiment Construction

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. 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.

[0047] The invention discloses a fault diagnosis method for a battery system, which includes identifying battery equivalent circuit model parameters under different fault conditions, and obtaining the fault type of the battery for troubleshooting and repair, thereby improving the efficiency of the entire battery system. The invention includes the establishment of a fault model and the determination of a dynamic threshold, so that the fault diagnosis is fast and accu...

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Abstract

A battery system fault diagnosis method comprises the following steps: S1, establishing a battery equivalent circuit model in a healthy state, and carrying out parameter identification; S2, respectively obtaining the frequency response of each battery cell and the equivalent circuit model; S3, diagnosing whether each battery monomer in the actual battery system fails or not through the frequency response value of the battery equivalent circuit model and each battery cell and a dynamic threshold value; and S4, establishing a fault model through the equivalent circuit model, and judging a faulttype by utilizing a multi-fault model technology. According to the invention, the problems of narrow application range and inaccurate judgment in the traditional battery system fault diagnosis methodare solved.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to a battery system fault diagnosis method. Background technique [0002] Electric new energy electric vehicles have the advantages of low noise and almost zero emission, and are an important way to solve the problems of energy shortage and environmental pollution. The power battery is an important part of the electric vehicle, which determines the performance of the electric vehicle to a large extent. Lithium-ion batteries have the characteristics of high voltage, high energy and no memory, and the battery packs composed of them are widely used in electric vehicles and energy storage systems. Vehicle accidents are common due to battery safety issues. In view of the frequent occurrence of lithium-ion battery safety accidents, battery fault diagnosis has received more and more attention in the development of electric vehicles. [0003] Existing battery fault diagnosis methods hav...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/367G01R31/382
CPCG01R31/367G01R31/382
Inventor 刘征宇刘项姚利阳杨昆汪浩
Owner HEFEI UNIV OF TECH
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