关键词: 电池包；降维模型；温度估算；传热模型

Abstract: The traditional methods used to estimate the temperature of battery pack often use 3D simulation calculation, which generally has problems such as long modeling cycle, difficulty in solving and large amount of conclusion data. Not only the software and hardware platforms have special requirements, but also can not meet the high real-time application scenarios. Therefore, the analysis of battery pack temperature estimation based on dimensionality reduction model is carried out. Firstly, an equivalent one-dimensional discrete heat transfer model is built, and the partial differential equation is simplified to ordinary differential equation, and then the ordinary differential equation is transformed into a difference equation by numerical discretions, and then the interpolation scheme, boundary conditions and control strategy are introduced, and the transient recursive solution is finally completed. Three parameters are introduced into the model to correct the minimum, average and maximum estimated temperature of the battery pack. The results show that the dimensionality reduction model is fast, and the maximum error of the calculation results is about 2 ℃ before the correction, and the maximum error of the calculation results can be controlled within 1 ℃ after the correction. Therefore, the dimensionality reduction of the battery pack temperature is feasible to simplify the calculation, and the calculation efficiency is improved on the premise of ensuring the accuracy, which provides conditions for the subsequent multi-scenario application of the lithium battery pack temperature.

Key words: Battery pack; Dimensionality reduction model; Temperature estimation; Heat transfer model