Battery surface temperature distribution estimation method and system

Abstract

The invention discloses a battery surface temperature distribution estimation method and system. The battery temperature estimation method proposes a three-heat-source electric-thermal coupling model for the first time, and the three-heat-source electric-thermal coupling model comprises a three-heat-source heat transfer model and a resistance distributed equivalent current model which are used for calculating thermal characteristics and electrical characteristics of a battery respectively so as to achieve instantaneous temperature estimation of characteristic temperature points; the method specifically comprises the following steps: establishing a three-heat-source heat transfer model and a resistance distributed equivalent circuit model; measuring and acquiring a battery voltage value, a current value and a temperature value of a feature point under different working conditions; identifying related parameters in the model respectively; and verifying the precision and responsiveness of the model under steady-state and transient-state working conditions. The real-time temperature monitoring capability of the battery management system is further improved. According to the method, only four feature temperature points in the single battery are selected for analysis, the calculation complexity is greatly reduced, practical application is easy, and the method has important significance on battery surface temperature distribution real-time estimation and thermal management structure design.

Description

Technical field [0001] The present invention belongs to the technical field of battery management, and it is related to the surface temperature distribution estimation method and system of battery surface. Background technique [0002] The lithium-ion battery is widely used in electric vehicles and mobile robots as the energy storage device, and its performance is greatly affected. With the development of battery body technology, the energy density of lithium-ion batteries is constantly improving, and hot security issues are getting more and more worth paying attention. Due to the traffic effect of the positive and negative amphipode fluid in the battery, the heat generation of the lithium-ion battery does not cause temperature distribution uneven, under some working conditions, the temperature difference between the monomeric cells is even more than 10 ° C, which greatly affects the battery. Safety and service life. Therefore, it is especially important to establish a thermal mo...

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Problems solved by technology

[0006] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method and system for estimating the temperature distribution of the battery surface, aiming at solving the problem that the prior art cannot realize the rapid estimation of the temperature distribution of the single battery, the calculation complexity is high, and the Defective technical issues for practical application

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