A method, system and device for diagnosing short-circuit and low-capacity faults of series battery packs with fusion of equalization information

Abstract

The invention discloses a short-circuit and low-capacity fault diagnosis method, system and equipment of a series battery group that integrates balance information, and belongs to the field of circuit fault diagnosis, aiming at solving the problem that the short-circuit fault and low-capacity fault diagnosis process in the prior art cannot be considered in the circuit The effect of equalization cannot be applied to the flawed technical problem in battery systems equipped with equalization control. Multi-fault diagnosis of the battery pack in the balanced state performs fault detection according to whether the battery pack meets the consistency requirements. Fault detection realizes real-time detection and monitoring of short-circuit and low-capacity faults by analyzing the balance information under driving conditions and charging conditions. Distinguish and realize fault quantification, which solves the problem that the existing short circuit or aging-related fault diagnosis methods fail under equalization. Using the equalization process information to detect and distinguish short-circuit and low-capacity faulty cells in the battery pack, effectively reducing the calculation load of fault diagnosis and facilitating the application of the actual battery management system.

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-connected battery packs integrating balanced information. Background technique [0002] In recent years, the research in the field of battery management technology has developed rapidly, and the level of research theory and engineering application has been greatly improved. Among them, the research on battery fault diagnosis and estimation is an area that needs to be deeply explored. It is necessary to study the fault characteristics and diagnosis methods of common fault types of battery packs such as short-circuit faults and low-capacity faults. [0003] In the research of short-circuit fault, the research of internal short-circuit fault is the current hot spot. The fault diagnosis methods mainly include correlation coefficient method, method of estimating remaining charging capacit...

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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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