A monitoring method for a power battery pack multi-cell solder joint state monitoring system

Abstract

Provided is a power battery pack multi-electrical core welding spot state monitoring system and monitoring method, belonging to the electric automobile power battery pack technical field. The system comprises a BMS, a first PCB, a second PCB, N electrical cores and 2N relays, wherein N>=2, and N is an integer. Two ends of the electrical core are respectively in parallel connection with a relay to form a single module; the single modules are in parallel connection to form a total module to be in parallel connection with the BMS. The BMS compares the DC internal resistance of a single module and the DC internal resistance of the total module to calculate the electrical core welding spot state of the single module. The system employs the BMS to control the relays to detect and report electrical core DC internal resistance states, allowing a user to master the soundness of electrical core welding spots in a power battery pack, and performing monitoring and early warning on the power battery pack and a whole vehicle.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle power battery packs, and in particular relates to a monitoring method of a power battery pack multi-cell solder joint state monitoring system. Background technique [0002] Under the background of current energy shortage, environmental pollution, energy saving and emission reduction, my country's new energy industry is changing with each passing day, especially the electric vehicle industry is advancing by leaps and bounds. In 2014, the annual sales of electric vehicles in my country reached 42,000 units, but the rapid The development has also brought some safety problems, especially in recent years, there have been electric vehicle fires due to battery failures in various parts of the world, which makes us realize that how to ensure the safety of power batteries is a problem that cannot be ignored. [0003] Existing power battery packs for vehicles include battery cells, brackets, and con...

AI Technical Summary

Problems solved by technology

Among them, mechanical force detection mainly relies on mechanical forces such as pulling and prying to detect welding quality, which is generally only applicable to individual random inspections, and human factors are greatly affected, and there is a certain degree of destructiveness; resistance detection and temperature rise detection are affected by equipment, materials and the environment Large, poor accuracy, and not conducive to operation

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