Reliability analysis and optimization design of liquid-cooled lithium-ion battery pack

doi:10.19799/j.cnki.2095-4239.2022.0274

Abstract

Abstract:

Lithium-ion batteries have been extensively applied in novel energy vehicles and other fields. Their reliability directly influences vehicle conditions. The lithium-ion battery pack must rely on an efficient thermal management system to guarantee its safe and reliable operation. The liquid cooling system has a good effect on the total temperature regulation of the battery module and the temperature uniformity control. The heat dissipation effects of the serpentine and double inverted U-shaped cooling channels on the battery pack are simulated and compared using the established finite element simulation model of the liquid-cooled lithium-ion battery pack. The maximum temperature of the battery pack is reduced by 17.2 ℃, and the temperature difference is reduced by 12.1 ℃ when twin inverted U-shaped cooling channels are used instead of serpentine cooling channels. The double inverted U-shaped cooling channel with a better cooling effect is used as the structure to be optimized, the overall temperature of the battery pack is reduced, and the temperature uniformity is improved by adjusting the inlet temperature and flow rate of the cooling liquid and adding graphene films. The problem of local overheating has been alleviated, the battery pack's reliability has increased, and the maximum temperature of the battery pack has been reduced by 32.2%. The temperature difference has also been reduced by 59.2%.

Key words: lithium-ion battery pack, liquid cooling, double inverted U shape, temperature uniformity, reliability

CLC Number:

TM 911

Yan LIU, Chun XIAO, Wei WU, Wenjing WANG, Yu WAN. Reliability analysis and optimization design of liquid-cooled lithium-ion battery pack[J]. Energy Storage Science and Technology, 2022, 11(11): 3566-3573.

Figures/Tables 15

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Tabel 1

18650 type Li-ion battery symbol description and parameters"

符号	说明	数值 /mm
$L n$	负电极长度	0.055
$L s$	隔膜长度	0.030
$L p$	正电极长度	0.055
$L b$	电池厚度	0.157
$r b$	电池半径	9
$r m$	心轴半径	2
$d c$	电池罐厚度	0.250
$h b$	电池高度	65

Tabel 1

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Table 2

Fig. 9

Fig. 10

Fig. 11

Fig. 12

Fig. 13

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平均流量/(cm³/s)	T_max/℃	∆T/℃	流体温度/℃	P/Pa	V/(mm/s)
0.05	65.6	16.2	65.2	256.8	22.8
0.10	46.3	12.0	45.8	516	45
0.15	39.5	9.5	39.1	777	66.6
0.20	36.0	7.9	35.6	1042	87.7
0.25	33.9	6.8	33.4	1312	108
0.30	32.4	5.9	32.0	1587	129
0.35	31.4	5.2	30.9	1867	149
0.40	30.6	4.6	30.4	2153	168
0.45	30.1	4.3	29.8	2444	188
0.50	29.7	4.1	29.3	2741	206

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