The heat generated by the polymer lithium-ion battery in the closed battery compartment of the underwater vehicle is extremely difficult to dissipate, which will cause the temperature of the polymer lithium battery pack
pack to rise, thereby affecting its performance and safety. With the increasing development and exploration of oceans in my country, the application range of electro-powered underwater vehicles is becoming wider and wider. Higher requirements are put forward on electric powered underwater vehicles, so the requirements on battery packs are also more stringent. Because of its many advantages, such as large capacity, high specific energy, and good cycle performance, polymer lithium-ion batteries have become a kind of power battery with great potential and one of the energy sources for underwater vehicles. But the hidden danger of the currently used polymer lithium-ion battery is that it will burn violently under certain circumstances, such as the fire of lithium battery pack on Boeing 787 aircraft, explosion of iPhone battery and the burning of electric taxi in Hangzhou, among which thermal runaway is caused One of the important reasons for burning. The working environment of the polymer lithium ion battery pack in the battery compartment of the underwater vehicle is particularly harsh, so it is of great significance to analyze the temperature field of the polymer lithium ion battery pack. A mathematical model of polymer lithium-ion batteries was established for the closed compartment of an underwater vehicle. Ansys software was used to analyze the temperature field of the closed compartment battery pack, 1/2 battery pack, 50 and 20 battery packs. The simulation results show that the heat generated by the battery pack composed of this layout is mainly transferred in the X and Y directions, and the temperature field of the battery pack at both ends has little influence and the positive and negative poles cannot be ignored when the temperature field of the battery pack is analyzed. . References:  Feng Xuning, Li Jianjun, Wang Li, et al. Experiment and modeling of anisotropic heat conduction for lithium-ion batteries[J]. Journal of Automotive Safety and Energy Conservation, 2012, 3(2): 158-164  Wang Jinpeng, Wang Xiaobo, Niu Xichen. Analysis of temperature field of lithium battery pack pack in a closed battery compartment[J]. Power Technology, 2010, 34(12): 1233-1235.  Yang Shiming, Tao Wenquan. Heat Transfer (4th Edition) [M]. Beijing: Higher Education Press, 2006. u003c/pu003e
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