Numerical analysis of temperature rise characteristics of lithium battery based on dual-channel parallel series liquid cooling plate

doi:10.19799/j.cnki.2095-4239.2024.0866

Abstract

Abstract:

Among the cooling modes of lithium battery energy storage system, liquid-cooled cooling system has obvious advantages, but different liquid-cooled plates and different liquid-cooled structures have significant effects on the performance of liquid-cooled cooling system. In order to solve the thermal safety problem of lithium battery, the 280Ah lithium-ion battery was numerically analyzed by ANSYS FLUENT, and a three-dimensional transient heat generation model of lithium battery based on Bernardi's heat generation rate, fluid momentum conservation equation and energy conservation equation was constructed to simulate the change of temperature field of lithium battery pack at high rate of operation, and to study the cooling effect of three different connection methods of a dual-channel parallel series liquid cooling plate under this state. The effects of coolant flow rate, initial temperature of coolant and channel height of liquid cooling plate on the cooling effect of lithium battery pack were analyzed, and the optimal cooling scheme of the liquid cooling plate was obtained. The results show that among the three connection schemes, the third alternative connection scheme has the best heat dissipation performance and makes the battery pack more evenly heated.Based on the third connection scheme, with the increase of coolant flow rate, the maximum temperature of lithium battery pack changes from rapid decline in the initial stage to slow decline; When the inlet temperature of coolant is lowered, the maximum temperature of lithium battery pack decreases obviously; By analyzing and comparing the coolant channels with different heights, increasing the channel height appropriately can effectively improve the heat dissipation performance of the liquid cooling system. Based on this study, under the action of the liquid cooling plate structure, the best cooling scheme can be obtained by increasing the coolant flow rate, reducing the coolant inlet temperature and increasing the flow channel height of the liquid cooling plate structure.

Key words: Lithium battery, Liquid cooling plate, Liquid cooling system, Liquid-cooled structure, heat dispersion

CLC Number:

TM911

Figures/Tables 14

Fig. 1

Table 1

Battery Cell Parameters"

参数名称	数值
标准容量/ $A h$	280
额定电压/ $v$	3.2
内阻/ $m Ω$	0.16
电池重量/ $k g$	5.36
长 $×$ 宽 $×$ 高/ $m m$	$174 × 72 × 207$

Table 1

Table 2

Thermophysical parameters of each material"

材料	密度 $k g ⋅ m - 3$	比热容 $J / (k g ⋅ K)$	导热系数 $W / (m ⋅ K)$
电芯	2118	1150	21.6/21.6/2.1
导热垫	2750	1500	2
铝	2719	871	202.4
铜	8920	386	377
50 %乙二醇水溶液	1071	3300	0.384

Table 2

Fig. 2

Fig. 3

Fig.4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9

Fig.10

Fig.11

Fig.12

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