【摘要】 动力电池导热系数因其结构复杂性影响具有各向异性。使用热流计法测量了动力电池厚度方向上不同区域的导热系数,并测量了绝热条件下锰酸锂电池(12 Ah)和磷酸铁锂电池(20 Ah)的发热情况,用Bernardi方程计算出电池发热量方程。利用测量出的导热系数及发热量数据对两种电池建立了模型,计算对比了相同环境条件下两种电池在相同放电电流和相同放电倍率情况下的发热情况。结果表明,电池中部与两侧导热系数相差40.5%,相同放电电流和时间条件下小容量电池温升更大,在10 A放电800 s时温差为2.52℃,而相同放电倍率情况下大容量电池温升在2C放电800 s时比小容量电池高13.17℃。更多还原

【Abstract】 The thermal conductivity of power batteries is anisotropic due to their complicated structures. In this paper,the heat flow meter method was used to measure the thermal conductivity of different areas in the direction of thickness. Then the adiabatic heating of the lithium manganese battery(12 Ah) and the lithium iron phosphate battery(20 Ah) was measured. The Bernardi heat generation model was used to obtain the battery heat generation equation. The mathematic model of two types of battery was established by using the measured heat conductivity. The heat output was compared with the same discharge current and the same discharge rate respectively. The results show that the thermal conductivity of the electrode area is 40.5% higher than that of the middle area. With the same discharge time,the smaller capacity battery has a faster temperature rise. At the discharge current of 10 A and the discharge time of 800 s,the temperature difference between the two batteries is 2.52 ℃. However,with the same discharge rate,the temperature increase of the larger capacity battery is 13.17 ℃ higher than that of the smaller one in 2 C discharge at 800 seconds.更多还原