Power battery pack internal temperature online detection method and system

Abstract

The invention discloses a power battery pack internal temperature online detection method and system. The power battery pack internal temperature online detection method includes the steps of determining a power battery pack apparent resistivity detection system platform based on the electrical resistance tomography, obtaining the power battery pack internal apparent resistivity, establishing a smoothness restraining least square method, obtaining three-dimensional inversion images of the power battery pack internal apparent resistivity in real time, and according to the relationship between the power battery pack internal apparent resistivity and changes of the internal temperature, obtaining a power battery pack internal temperature field distribution diagram, determining a partial high temperature abnormal change phenomenon and giving an early warning signal. According to the power battery pack internal temperature online detection method and system, traditional detection limitation is broken through, and the power battery pack internal apparent resistivity based on the electrical resistance tomography is detected so that the internal temperature distribution conditions can be indirectly and accurately obtained. The three-dimensional image inversion method is established, therefore, the power battery pack running health condition can be mastered in an all-directional mode, and the safety performance of a power automobile in practical running is effectively improved.

Description

technical field [0001] The invention relates to the field of safety monitoring of the internal temperature of a power battery pack of an electric vehicle, in particular to an online detection method and system for the internal temperature of a power battery pack based on electrical resistance tomography (ERT) technology. Background technique [0002] With the rapid development of the automobile industry, the market competition is becoming more and more fierce. Especially in order to solve energy and environmental problems, countries around the world have taken the accelerated development of energy-saving and new energy vehicles as an important strategy for the sustainable development of the global automobile industry in the future. New energy vehicles have become one of the seven strategic emerging industries in my country. With the rapid development of electric vehicle research and development, the safety issues in electric vehicle products have become more and more promine...

AI Technical Summary

Problems solved by technology

This patent only detects the temperature of one lithium battery, and only takes temperature threshold shutdown protection measures for the remaining lithium batteries, and does not involve the internal temperature detection of lithium battery packs combined in series and parallel.

Images