Busbar separation and open circuit monitoring system and method for battery pack

Abstract

The invention discloses a busbar separation and open circuit monitoring system and a method for battery pack. In this monitoring system, the display unit is mounted on the shell, and the power module,the data acquisition unit, the main control module, the power amplifier circuit, the operational amplifier circuit, and the pulse generating unit are all mounted inside the shell. The output end of the pulse generating circuit is connected to the input end of the operational amplifier circuit. The output end of the operational amplifier circuit is connected to the input end of the power amplifiercircuit. The output end of the data acquisition unit is connected to the input end of the main control module. The main control module is connected with the display unit. The data acquisition unit, the main control module, the display unit, the power amplifier circuit, the operational amplifier circuit, and the pulse generating unit are electrically connected to the power module respectively. According to the busbar separation and open circuit monitoring system and the method for battery pack, on the basis of bisection, a characteristic signal is injected into the battery pack, and the faultinterval is gradually positioned through the feedback signal, whether the battery pack has a busbar separation fault or an open circuit fault or not can be judged, and the fault position can be accurately and effectively positioned.

Description

technical field [0001] The invention belongs to the technical field of storage battery fault diagnosis, and relates to a monitoring system and method for a storage battery pack disconnected from a bus bar and an open circuit. Background technique [0002] The battery pack of the DC system used in the station / factory is used as the backup power source of the DC system to start the heart function in the DC system; the DC system is designed with special on-line monitoring equipment and requires regular inspections. accident. Over the years, many accidents in the power system have been caused by the failure of the battery in the DC system. The reason is that the online monitoring technology of the battery failed to detect the failure of the battery, and the maintenance cycle of the battery was too long to solve the failure during operation. Therefore, it is necessary to study more effective battery online monitoring technology, develop new equipment on the basis of new technolo...

AI Technical Summary

Problems solved by technology

[0004] Insufficiency of the voltage comparison method: due to the power characteristics of the battery pack and the DC system charger, the voltage method has limitations in judging off-bus faults and battery open-circuit faults, and cannot fully detect all types of faults; battery micro-open circuit faults cannot be effectively judged, and battery open-circuit faults The fault cannot be judged in time, and it is impossible to distinguish between the battery open circuit fault and the fault of leaving the bus.

[0005] Insufficiency of the method of judging the magnitude of the current: the theory of judging the current method is feasible, but the technology is limited. The reason is that the state current of the battery pack ranges from milliamps to tens of hundreds of amperes, and the width range is large and bidirectional. It is necessary to sample bidirectional poles Small current and zero current cannot be achieved

Therefore, the technology is still theoretically simple at this stage and cannot form effective products.

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