A method and device for quickly detecting the failure of parallel cells in a series-parallel battery pack

Abstract

Abstract The invention relates to a rapid failure detection method of parallel single batteries in a serial-parallel battery pack, used for the failure detection of the parallel single batteries. According to the detection method, solenoid coils are unidirectionally winded on outer surfaces of the parallel single batteries, the size and the direction of the current in the single batteries are indirectly sampled by using the Faraday law of electromagnetic induction. and then whether the single batteries are invalid is judged based on the sampled size information and the direction information of the current. The detection method is simple, the cost budgeting is lower and the practicability is higher, the size and the direction of the current of each working single battery in the parallel battery pack are monitored, therefore the rapid detection of each single battery in the parallel battery pack is effectively realized, the accuracy and the reliability of the detection are improved, meanwhile the security and the validity of the entire detection are improved, and the ability of predicting the performance of the batteries is also improved. Fig. 1 Solenoid coil Curant infoatim CImcto Batey.ng.n Sol eno id collecting an coil es m e Fig. 2 Solenoid coil ----------------------------------- SoenidInfarnation 1 1 tiP, / m iai Baty nget coi l sapling module pmesn euecre .eul7odl .Fg 3 i I a-rent infonontid collecting and psing module I Solenoid L-----------__------_------------ Fig. 3 Solenoid coil .. Solenoid _ Oret inforniatimn collecting and processing nodule : coil Fig. 4

Description

Technical field [0001] The invention relates to the technical field of storage batteries, in particular to a method and device for quickly detecting failures of parallel monomers in series-parallel battery packs. Background technique [0002] With the development of the world's automobile industry, the consumption of petroleum energy, the air pollution caused by automobile emissions and the global greenhouse effect, the development of new automobile energy and the development of new automobile power has become a very urgent task for the world automobile industry. The current new green environmental protection electric vehicles usually use lithium-ion battery packs as power sources. The application of more than ten strings or even hundreds of lithium-ion battery packs in green environmental protection electric vehicles has achieved great development and has broad application prospects. In practical applications, lithium batteries often need to be used in series and parallel to for...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problems of complex detection structure, complex operation, poor practicability, poor detection accuracy and detection efficiency, and inability to detect the state of each single battery in the power battery pack in the existing failure detection method, and provides a A rapid detection method for the failure of parallel monomers in a series-parallel battery pack adopts a unidirectional winding of a spiral coil on the outer surface of each parallel monomer battery, and uses Faraday's law of electromagnetic induction to indirectly sample the magnitude and direction of the current in the monomer battery. Then judge whether the single battery is invalid. This detection method is simple and reduces the cost budget, and has high practicability. It realizes the efficient and fast detection of each parallel single failed battery in the power battery pack, and improves the detection accuracy and reliability at the same time.

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