基于4680圆柱电芯的浸没和冷板式电池包冷却仿真与热失控实验研究(英文)

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【Abstract】This studyfocuses onthe thermal managementof 468O-type cylindrical lithium-ion baterypacks utilizing NCM811 chemistry.It establishes coupled multi-physics models forboth immersionand serpentinecold platecoolingsystems. Throughacombinationof numerical simulationand experimentalvalidation，the technicaladvantagesand mechanismsof immersioncolingaresystematicallexplored.Simulationresultsindicatethatundera3Cfast-chargingcondition （inlet temperature 20 ，flow rate 36 L/min），the immersion cooling structure 3demonstrates a triple enhancement in thermal performancecompared tothecold plate structure1：a13.06%reduction inpeak temperature，a31.67%decreaseinoveral maximum temperature difference，and a 47.62 % decrease in single-cell temperature deviation，while also reducing flow resistance by 33.61 % .Furthermore，based on the immersion coling model，a small battry module comprising seven cylindrical cells was designedforthermalrunaway testing vianailpenetration.Theresultsshowthatthepeak temperatureofthetriggered cell was limited to 437.6 °C ，with acontrollable temperature rise gradient of only 3.35℃/s and a rapid cooling rate of 0.6 ℃/s. The maximum temperature rise of adjacent cells was just 64.8 ，effectivelyinhibiting thermal propagation.Post-test disassembly revealed that the non-triggered cells retained > 99.2% of their original voltage and S 99% structural integrity， confirming the module'sability to achieve“localized failure with global stability."

Keywords：Immersioncooling，468o battery，Thermal runaway，Numerical simulation

【摘要】针对NCM811体系4680圆柱电池包构建浸没式与蛇形冷板式热管理系统的多物理场耦合模型，通过数值仿真与试验验证相结合的方法表明：在3C快充工况下，浸没式结构3相较冷板结构1实现整包温度特性三重优化，峰值温度降低 13.06% ，全域最大温差下降 31.67% ，单电芯温差锐减 47.62% ，流阻降低 33.61% 。（剩余24057字）