Series battery pack short-circuit and low-capacity fault diagnosis method of fusing equalization information, system and equipment

Abstract

The invention discloses a series battery pack short-circuit and low-capacity fault diagnosis method of fusing equalization information, a system and equipment, belongs to the field of circuit fault diagnosis, and aims to solve the problem that the influence of equalization in a circuit cannot be considered in the short-circuit fault and low-capacity fault diagnosis process in the prior art, and the circuit can not be applied to a battery system equipped with equalization control. According to the multi-fault diagnosis of the battery pack in the balanced state, fault detection is executed according to whether the battery pack meets the consistency requirement or not, and the fault detection realizes real-time detection and distinguishing of short-circuit and low-capacity faults and realizes fault quantification through analysis of balanced information under the driving working condition and the charging working condition. The problem that an existing fault diagnosis method related to short circuit or aging fails under balance is solved. The short-circuit and low-capacity fault cells in the battery pack are detected and distinguished by using the equalization process information, so that the fault diagnosis calculation load is effectively reduced, and the actual battery management system application is facilitated.

Description

technical field [0001] The invention belongs to the field of circuit fault diagnosis, and relates to a method, system and equipment for diagnosing short-circuit and low-capacity faults of series battery packs with fusion of equalization information. Background technique [0002] In recent years, the research in the field of battery management technology has developed rapidly, and its research theoretical level and engineering application level have been greatly improved. Among them, the research on battery fault diagnosis and estimation is an area that needs to be further explored. It is necessary to study the fault characteristics and diagnosis methods of common fault types such as short-circuit faults and low-capacity faults. [0003] In the research of short-circuit faults, the research of internal short-circuit faults is currently a hot spot, and its fault diagnosis methods mainly include the correlation coefficient method, the method of estimating the remaining charging...

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Problems solved by technology

[0007] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method, system and device for diagnosing short-circuit and low-capacity faults of series-connected battery packs that fuses equalization information, aiming to solve the short-circuit fault and low-capacity fault diagnosis in the prior art The process cannot take into account the influence of equalization in the circuit, and cannot be applied to defective technical problems in battery systems equipped with equalization control

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