（School of Mechanical & Electrical Engineering, Wuhan Institute of Technology, Wuhan 430205, China）
Abstract: The suitable operating temperature for lithium batteries should not be too high, and effectively controlling the temperature of the battery pack is one of the most important tasks in the new energy vehicle industry. A three-dimensional model of a bottom-to-top liquid-cooled battery pack was established, and the effects of coolant flow direction, type, velocity, flow channel structure, and heat-conducting ribbed plates on the cooling performance of the battery pack under a 2C discharge rate were studied through Fluent numerical simulation. The results show that: counter-current arrangement is better than co-current arrangement for heat dissipation; water and PG20 have better cooling effects, followed by fluorinated fluids, and then silicone oil. Within 100 ℃, PG20 still maintains good thermal stability and insulation, and its freezing point is lower than that of water, making it the best choice for a coolant. As the coolant flow rate increases, the maximum temperature,average temperature, and maximum temperature difference of the battery pack decrease, and the flow rate tends to stabilize after reaching a certain value. The leaf vein cooling channel battery pack has the lowest maximum temperature, average temperature, and maximum temperature difference. As the number of heat-conducting ribbed plates increases, the average temperature of the battery pack decreases,and the amplitude reduces, with the maximum temperature and maximum temperature difference no longer changing after the number of heat-conducting ribbed plates reaches a certain value.
Key words: lithium battery pack; new energy vehicle; liquid cooling; thermal stability; runner structure; heat-conducting ribbed plate
參考文獻(xiàn)
[1] 徐曉明. 動(dòng)力電池?zé)峁芾砑夹g(shù)——散熱系統(tǒng)熱流場(chǎng)分析[M]. 北京：機(jī)械工業(yè)出版社，2018.
[2] 潘新鋒，邵長(zhǎng)風(fēng)，王小燕. 車(chē)用鋰電池?zé)崾Э靥匦约捌?span style="font-size: 12px;">控制方法分析[J]. 時(shí)代汽車(chē)，2024(17) ：145-147.
[3] DING Z, HU D, JING Y, et al.Research on precise lithium battery state of charge estimation method based on CALSE-LSTM model and pelican algorithm[J].Heliyon，2024，10(16) ：36232.
[4] CHENG Y, ZHAO S, SHEN G, et al.Real-time temperature monitoring of lithium batteries based on ultrasonic technology[J].ACS Omega，2024，9(17) ：19517-19524.
[5] ZHAO Chunrong, CAO Wenjiong, DONG Ti, et al.Thermal behavior study of discharging/charging cylindrical lithium-ion battery module cooled by channeled liquid flow[J].International Journal of Heat and Mass Transfer， 2018， 120 ：751-762.
[6] 馮能蓮， 馬瑞錦， 陳龍科， 等. 新型蜂巢式液冷動(dòng)力電池模塊傳熱特性研究[J] . 化工學(xué)報(bào)，2019，70(5) ：1713-1722.
[7] WEI Wenhua, LUO Zhi, QIAO Shixin, et al.Analysis and design of module-level liquid cooling system for rectangular Li-ion batteries[J].International Journal of Heat and Mass Transfer，2024，225 ：125435.
[8] 劉歡歡，任曉龍，張澤斌. 鋰電池肋片液冷板的傳熱與流動(dòng)特性研究[J]. 電源技術(shù)，2024，48(7) ：1260-1266.
[9] 楊梓堙，竺玉強(qiáng)，王亞平，等. 基于 PCM-液冷復(fù)合的鋰離子電池?zé)峁芾硌芯縖J] . 電源技術(shù)，2022，46(12) ：1388-1392.
[10] 吳成會(huì)，梁才航. 基于浸沒(méi)式冷卻的鋰離子電池實(shí)驗(yàn)研究[J]. 電源技術(shù)，2023，47(11) ：1409-1413.
[11] 汪陽(yáng)卿，莫俊林. 鋰離子動(dòng)力電池模塊散熱特性研究[J].船電技術(shù)，2019，39(5) ：59-62.
[12] BERNARDI D, PAWLIKOWSKI E, NEWMAN J.A general energy balance for battery systems[J].Journal of The Electrochemical Society，1985，132(1) ：5-12.
