Rapid detection method and device for invalidation of parallel single body in serial-parallel battery pack

Abstract

The invention relates to a rapid detection method and device for invalidation of a parallel single body in a serial-parallel battery pack, which are used for detecting the invalidation of each parallel single body battery. The detection method comprises: winding a spiral coil on the surface of each parallel single body battery in a single direction, and indirectly sampling the size and direction of current in the single body battery by utilizing a Faraday's electromagnetic induction law, so as to judge whether the single body battery is invalid or not based on the size and direction information of the sampled current. The detection method is simple, relatively low in cost budget and relatively high in practicability, and the size and direction of the current in a working process of each single body battery in the parallel battery pack are monitored, so that rapid detection of each single body battery in the parallel battery pack is effectively realized, and the accuracy and reliability of detection are realized; meanwhile, the safety and effectiveness of whole detection, and a battery performance predication capability are improved.

Description

technical field [0001] The invention relates to the technical field of storage batteries, in particular to a method and device for quickly detecting the failure of parallel monomers in a series-parallel battery pack. 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 greenhouse effect of the earth, the development of new energy sources and new power for automobiles has become a very urgent task for the world's automobile industry. The current new green electric vehicles usually use lithium-ion battery packs as a power source. The application of more than ten or even hundreds of lithium-ion battery packs on green electric vehicles has achieved great development and has a broad application prospect. In practical applications, lithium batteries often need to be used in series and parallel to form a series-parallel battery pack to meet the voltage and...

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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