(1. 中南大學(xué) 冶金與環(huán)境學(xué)院，長(zhǎng)沙 410083；
2. 江蘇敏安電動(dòng)汽車有限公司，淮安 223005)
摘 要: 針對(duì)現(xiàn)有鋰離子電池?zé)嵛镄詤?shù)獲取手段的缺陷，以方形硬殼鋰離子電池為對(duì)象，進(jìn)行熱物性參數(shù)研究。基于體積平均法計(jì)算，得到電池的等效密度2218 kg/m3，等效比熱容1060 J/(kg？℃)。通過(guò)模擬穩(wěn)態(tài)平板法測(cè)試導(dǎo)熱系數(shù)的邊界條件，計(jì)算得到50 A？h硬殼鋰離子電池3個(gè)方向的等效導(dǎo)熱系數(shù)分別為高度方向17.2 W/(m？℃)，厚度方向5.3 W/(m？℃)和長(zhǎng)度方向23.4 W/(m？℃)。將電池結(jié)構(gòu)離散為獨(dú)立的熱阻單元，建立熱阻的熱網(wǎng)格模型，基于基爾霍夫節(jié)點(diǎn)電流法，建立電路對(duì)應(yīng)的線性方程組，求解得到電池的等效熱阻和等效導(dǎo)熱系數(shù)，結(jié)果表明，熱網(wǎng)格模型法獲得的導(dǎo)熱系數(shù)值與仿真法誤差小于2%。
關(guān)鍵字: 方形硬殼鋰離子電池；密度；比熱容；導(dǎo)熱系數(shù)；熱阻
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Jiangsu Min’an Electric Automotive Co., Ltd., Huai’an 223005, China）
Abstract:The thermal properties of hard cased lithium-ion power battery was investigated. Firstly, the equivalent density of 2218 kg/m3 and equivalent specific heat of 1060 J/(kg·℃) were got according to average volume method. Then, through modeling the boundary conditions of thermal conductivity test, the height conductivity of 17.2 W/(m·℃), the thickness conductivity of 5.3 W/(m·℃) and the length conductivity of 23.4 W/(m·℃) are obtained, respectively. Finally, the thermal network model was set up by discretizing the hard-cased lithium-ion battery structure to resistance units. The Via Kirchhoff current law, linear equations of the circuit network were established, and then were solved to get equivalent thermal resistance and equivalent thermal conductivity. The results show that the error between thermal conductivities obtained by modeling method and by thermal network method is less than 2%.
Key words: hard-cased lithium-ion battery; density; specific heat; thermal conductivity; thermal resistance
