卷绕结构因具有更优异的电学性能而被广泛应用到锂电池中,为了更准确地研究锂电池热特性,应同时考虑锂电池卷绕结构径向及周向热传导.通过数值模拟的方法研究了卷绕层数、卷绕张力以及正极材料热导率对卷绕结构有效热导率的影响.结果表明:随着卷绕层数的增加,卷绕结构的有效热导率逐渐减小,有效热导率的变化幅度也减小;在相同的卷绕层数下,随着卷绕张力的增加,有效热导率逐渐增大;对于低卷绕层数结构,卷绕张力对有效热导率的影响显著,而对于高卷绕层数结构,有效热导率的变化相对平缓.提高正极材料的热导率可以在一定程度上改善卷绕结构的等效热导率,但是对于卷绕层数较大的结构,正极材料的热导率超过40 W/(m·K)后,对有效热导率的影响很小,因此,应通过改善多种材料的导热性能来改善锂电池的有效热导率.%The spiral wound is widely used in lithium battery due to having higher power density. In order to analyze the thermo-physical properties of lithium battery more accurately,the anisotropy of thermal conduction in radial and spiral direction can't be ig-nored. The influence of winding layer,winding tension and the thermal conductivity of anode materials on the effective conductivity of the spiral wound is studied by numerical simulation. The simulation results indicate that the effective thermal conductivity of spiral wound decreases with the increase of winding layer,and the changing amplitude is also decreased. Under the same winding layer,the effective thermal conductivity of spiral wound increases with the winding tension,and the effect of winding tension on the effective ther-mal conductivity is more obvious for the low winding layer than that for the high winding layer. The effect of raising the anode material thermal conductivity on increasing the effective thermal conductivity is not obvious,especially for the high layer of spiral wound,when the anode material thermal conductivity exceeds 40 W/(m·K), the effect on the effective conductivity is slightly. It is pointed out that the effective conductivity of the lithium battery can be improved by increasing the heat conducting property of materials.
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