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

摘要： 传统用于估算电池包温度的方法，常采用三维仿真计算，一般都存在建模周期长、求 解难度大、结论数据量大等问题。不仅对软硬件平台有着特殊要求，而且无法满足高实时性 的应用场景。因此，开展了基于降维模型的电池包温度估算分析，首先搭建了一个等效一维 离散传热模型，将偏微分方程简化为常微分方程，然后进行数值离散，将常微分方程转化为 差分方程，再引入插值格式、边界条件、控制策略，最终完成瞬态递推求解。模型中引入三 个修正参数对电池包最低、平均、最高估算温度进行修正，结果表明，降维模型计算求解速 度快，修正前计算结果最大误差在 2 ℃左右，修正后计算结果最大误差可控制在 1 ℃以内。 因此，电池包温度的降维简化计算可行，在保证精度的前提下，提高了计算效率，为后续锂 电池包温度多场景应用提供了条件。

关键词: 电池包；降维模型；温度估算；传热模型