新能源汽车作为节约能源、环境友好型产品，以其在节能与缓解环境压力中的双重优势，已成为汽车产业未来发展的主要方向。面对电动汽车在工作中出现的自燃、起火等热失控问题，对电动汽车用动力电池进行热管理十分重要。本文以磷酸铁锂电池（LiFePO₄）为研究对象，开展以下研究：

（1）针对磷酸铁锂锂电池的热管理，提出相变材料与水冷结合的锂电池热管理模型。利用Bernardi等人的产热量计算模型，通过脉冲测试法（HPPC）计算电池的欧姆内阻，从而计算不同放电倍率下的电池产热功率，根据电池组的产热量估算相变材料的用量。

（2）进行锂离子电池单体建模与温升分析。通过分析锂离子电池产热原理及计算方法，并基于控制方程与边界条件，建立锂离子电池单体模型，通过单体电池放电实验和仿真分析进行验证，以及对单体电池自然散热进行仿真分析。

（3）进行锂离子电池热管理系统建模与控温分析。基于单体建模的结果，建立电池组模型，通过Fluent软件分别对自然冷却、15%EG含量的复合相变材料（15%EG/CPCM）、15%EG/CPCM +水冷组合热管理系统等三种模型进行仿真分析，模拟在环境温度为25°、30°、35°、40°下，电池以1C、2C倍率放电时的电池温升情况。

（4）搭建锂离子电池热管理系统实验平台，进行电池组在不同的温度、不同的放电倍率下的放电实验。实验结果表明，在环境温度为30°，以1C放电倍率放电的情况下，自然冷却散热即可满足控温要求；在环境温度为35°，以1C放电倍率放电的情况下，用15%EG/CPCM组成的电池热管理系统，可将电池组最高温控制在43.49°，温差控制在2.68°，可以满足热管理要求；在环境温度为40°，以2C放电倍率放电的情况下，15%EG/CPCM与水冷结合的热管理系统，可将电池表面最高温控制在49.61°以内，温差控制在3.51°。通过仿真与实验验证，结果表明15%EG/CPCM与水冷结合的锂电池热管理系统的有效性。

     As an energy saving and environmentally friendly product, new energy vehicles have become the main direction for the future development of the automotive industry due to their dual advantages in energy conservation and alleviating environmental pressure. In the face of thermal runaway problems such as spontaneous combustion and ignition in the operation of electric vehicles, thermal management of power batteries used in electric vehicles is very important. In this paper, lithium iron phosphate battery (LiFePO4) is taken as the research object, and the following studies are carried out:

(1) Aiming at the thermal management of lithium iron phosphate battery, a thermal management model of lithium iron phosphate battery combined with phase change materials and water cooling was proposed. Based on the thermal generation calculation model of Bernardi et al., the ohm internal resistance of the battery was calculated by the pulse test method (HPPC), so as to calculate the thermal power of the battery at different discharge rates. The amount of phase change material is estimated according to the heat production of battery pack.

(2) Conduct lithium-ion battery cell modeling and temperature rise analysis. By analyzing the lithium-ion battery heat production principle and calculation method, and based on the control equation and boundary conditions, we establish the lithium-ion battery cell model, verify it through the cell battery discharge experiment and simulation analysis, as well as simulate the natural heat dissipation of the cell battery.

(3) Modeling and temperature control analysis of the thermal management system of lithium-ion batteries were performed.  Based on this, the battery pack model was established. Fluent software was used to simulate and analyze three models of natural cooling, 15%EG composite phase change material(15%EG/CPCM) and 15%EG/CPCM + water cooling combined thermal management system. The simulation was carried out under the environment temperature of 25°, 30°, 35° and 40°.Temperature rise of the battery when discharging at 1C and 2C.

(4) Build the experimental platform of battery thermal management system, and conduct discharge experiments at different temperatures and discharge rates of battery packs. The experimental results show that natural cooling can meet the requirements of temperature control when the ambient temperature is 30° and the discharge rate is 1C.When the ambient temperature is 35° and the discharge rate is 1C, the battery thermal management system composed of 15%EG/CPCM is added, the maximum high temperature of the battery pack can be controlled at 43.49° and the temperature difference can be controlled at 2.68°, which can meet the requirements of thermal management. When the ambient temperature is 40° and discharge at 2C rate, the combination of 15%EG/CPCM and water cooling can control the maximum temperature of the battery surface within 49.61°, and the temperature difference is controlled at 3.51°.

    Through simulation and experimental verification, the results show that 15%EG/CPCM combined with water cooling lithium battery thermal management system is effective.

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