共查询到18条相似文献,搜索用时 234 毫秒
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电池包热管理系统的设计与开发对于保障电动汽车运行的安全性与可靠性有着非常重要的意义。概括了电池包热管理系统的功能要求,提出了电池包热管理系统设计的一般流程。结合某一具体的混合动力车NiMH电池包的开发,重点分析了在采用空气冷却法条件下散热结构的设计要点,并设计、验证了热管理系统。仿真及实验结果均表明,所提出的电池包热管理设计流程满足需求,最大温升可控制在10℃之内,最大温差可控制在3.5℃之内。 相似文献
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发热问题被认为是电子设备结构设计所面临三大关键难题之一,特别是电池包散热设计关系到消费者的用户体验及生命财产安全,长期以来都是设计中的重点、难点。文章对两轮车动力电池包散热设计思路、散热设计方法进行了归纳总结,对几种散热结构设计方案进行了详细介绍,对两轮车动力电池包散热结构设计提出了新的设计思路。 相似文献
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场协同原理可以应用于电动汽车不同冷却方式的散热性能分析,进而指导电动汽车冷却方式设计,研究表明,两边出风口模式的自然进风散热性能较差,上出风口模式具有较为优越的自然进风散热性能和气动性能;双口上出风模式比单口上出风模式散热性能优越,但气动性能稍差,综合考虑,选择单口上出风模式更能平衡电动汽车的气动性能和自然进风散热性能;随着车速提高,电池组最高温升和内部最大温差均降低,且与车速基本呈线性关系变化;水冷板不同流径的速度均匀性由低到高顺序如下:首先单进单出,其次双进双出,再到三进三出,最后为六进六出,根据场协同原理分析,散热性能逐次提高,并用试验分析和仿真计算结合的方法验证这一判断的准确性。上述结论为电动汽车冷却方式的选择提供参考依据。 相似文献
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选取双进双出流径液冷系统作为研究对象,采用试验的方法,对2并12串的电池模块热特性进行分析,结果表明:室温下,液冷系统的散热性能并不是随进液流量增大而改善的,而是呈现先提高后降低的趋势,进液流量为450L/h时满足最佳散热要求,同时也具有最佳的散热效率;电池模块中部间隙增大4mm时的散热性能同样不是随着进液流量增大而改善的,与原电池模块相比,最高温升和内部最大温差均有所降低,散热性能得到改善;35℃环境温度下,相同进液流量时的电池模块内部温差较室温时变大,
可见冷却液温度过多地低于环境温度并不一定会改善电动汽车液冷系统的散热性能,
而45℃环境温度下液冷系统的散热性能更差。所得结论为液冷系统散热性能分析提供了参考依据。
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可见冷却液温度过多地低于环境温度并不一定会改善电动汽车液冷系统的散热性能,
而45℃环境温度下液冷系统的散热性能更差。所得结论为液冷系统散热性能分析提供了参考依据。
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为研究计入外部环境热辐射因素后,电池包的布置位置对整车气动阻力和其自身散热的影响,计及高温时地面辐射和太阳辐射,采用可实现k-着湍流模型进行了CFD 数值模拟,通过实车道路实验验证仿真方案的准确性。在此基础上,对电池包前置、中置和后置的整车气动阻力进行了对比分析,以整车气动阻力最小的前置式电动汽车为研究对象,通过电池包高温工况下的温度场数值分析,提出了该布置下的电池包散热改进方案。结果表明,前置式电池包改进后,单体电池表面最高温度降幅为14.5 益,表面最低温度降幅为11.5 益,抑制了温差过大,降低了局部高温,提高了电池包的散热性能。 相似文献
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新能源汽车电池包内温度不均匀严重影响动力电池的电化学性能、循环寿命、安全性和使用可靠性,将电池包内温差控制在5℃内对上述关键技术问题的解决至关重要。文章主要通过UG软件绘制电池包三维几何模型,使用CFX软件对温度场进行仿真模拟,并通过试验进行验证。仿真结果表明,原方案中电池包内最大温差为12.7℃;优化方案1包内的最大温差为7.5℃;优化方案2的最大温差6.5℃;优化方案3最大温差4.3℃。试验结果表明,原方案最大温差为12℃;优化方案3最大温差为5℃。计算得原方案温差的试验与仿真结果相似度为94.5%,优化方案3的相似度为86%。综合考虑,优化方案3的结构设计符合要求。 相似文献
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Investigation of tool-chip interface temperature in dry turning assisted by heat pipe cooling 总被引:1,自引:1,他引:0
Liang Liang Yanming Quan Zhiyong Ke 《The International Journal of Advanced Manufacturing Technology》2011,54(1-4):35-43
Aiming to effectively remove the cutting heat in machining process, the cutting tool with heat pipe cooling has been developed in recent years; however, there were few reports on the quantitative investigation of temperature at the tool-chip interface of this tool. In this work, a heat pipe cooling system was used to decrease the temperature of the cutter. The temperature at defined locations of the cutter in the dry turning of an AISI-1045 steel was obtained by the cutting test. The finite difference solution and an inverse procedure were used to determine the tool-chip interface temperature. It was found that with the increase of cutting speed, the tool-chip interface temperature and effective heat flux of the cutter will increase. The tool-chip interface temperature could be reduced by the heat pipe cooling. The temperature reduction was more obvious in higher cutting speed. 相似文献
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The isothermal characteristics of a rectangular parallelepiped sodium heat pipe were investigated for high-temperature applications.
The heat pipes was made of stainless steel of which the dimension was 140 m(L) ×95m(W) ×46m(H) and the thickness of the container
was 5 mm. Both inner surfaces of evaporator and condenser were covered with screen meshes to help spread the liquid state
working fluid. To provide additional path for the working fluid, a lattice structure covered with screen mesh wick was inserted
in the heat pipe. The bottom surface of the heat pipe was heated by an electric heater and the top surface was cooled by circulating
coolant. The concern in this study was to enhance the temperature uniformity at the bottom surface of the heat pipe while
an uneven heat source up to 900 W was in contact. The temperature distribution over the bottom surface was monitored at more
than twenty six locations. It was found that the operating performance of the sodium heat pipe was critically affected by
the inner wall temperature of the condenser region where the working fluid may be changed to a solid phase unless the temperature
was higher than its melting point. The maximum temperature difference across the bottom surface was observed to be 114°C for 850 W thermal load and 100°C coolant inlet temperature. The effects of fill charge ratio, coolant inlet temperature and operating temperature on thermal
performance of heat pipe were analyzed and discussed. 相似文献
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YongJin Park Sangook Jun Sanghun Kim Dong-Ho Lee 《Journal of Mechanical Science and Technology》2010,24(2):609-618
The present paper proposes optimization procedures for loop heat pipe (LHP) designed to cool the lithium-ion battery for airborne
high energy electric lasers (HEL) without power consumption. The LHP is more efficient than the air cooling device using bleed
air. The battery temperature rising enlarges the permanent loss of its capacity and makes it unusable and unsafe. Cold speedy
air around a flying aircraft becomes a good heat sink for dissipating the battery heat. The design objective is to reduce
the weight of the LHP, considering the range of battery operating temperature and operational reliability. For numerical analysis,
the total system of the LHP is analyzed through a thermohydraulic model and the heat transfer of the porous wick is predicted
by the thin liquid film model. The thermal characteristics of the groove section are found by an analytical solution and a
finite difference method. The design optimization is executed by using approximation models for the cases of (1) a fixed heat
load, (2) a varied heat load without uncertainty consideration, and (3) a varied heat load with uncertainty consideration
about the generated heat of the battery. As result of the optimization process, the weight of the LHP was reduced significantly.
The optimized LHP for the varied heat load with uncertainty consideration case is most reliable and robust with slight increase
of the weight. 相似文献