Thermal management simulation analysis of cylindrical lithium-ion battery pack coupled with phase change material and water-jacketed liquid-cooled structures

doi:10.19799/j.cnki.2095-4239.2021.0091

Abstract

Abstract:

In order to address heat dissipation problems in cylindrical lithium-ion battery packs, we designed a new phase change material (PCM) water-jacket liquid-cooled coupling heat dissipation structure model. First, the influence of battery spacing on the surface temperature of the battery pack under the heat dissipation of the PCM model was studied, and the best battery layout of the PCM model was determined. According to this ideal battery layout, the heat dissipation structure model was optimized, that is, we determined the optimal flow channel structure of the PCM heat dissipation model. The simulation analysis shows that under the 6-channel structure model, the PCM water-jacket liquid-cooled coupling heat dissipation model has the largest effect with an 8 mm distance between the batteries. When the 3 C and 5 C high-rate discharges, the battery The maximum surface temperatures of the group were 33.78 ℃ and 41.11 ℃, respectively, which were reduced by 7.23 ℃ and 1.06 ℃, respectively, when compared to the maximum temperatures of the PCM heat dissipation model of the same size. Using the PCM water-jacket liquid-cooled coupling heat dissipation model, the maximum temperature difference between the batteries remains within 5 ℃. These results show that the new PCM water-jacket liquid-cooled coupling heat dissipation structure can ensure reasonably normal operation of a battery pack, as well as to improve its safety and durability.

Key words: phase change material, water-jacketed liquid cooling, coupled heat dissipation, cylindrical lithium-ion battery, thermal management

CLC Number:

TM 911

Juhua HUANG, Qiang CHEN, Ming CAO, Yafang ZHANG, Ziqiang LIU, Jin HU. Thermal management simulation analysis of cylindrical lithium-ion battery pack coupled with phase change material and water-jacketed liquid-cooled structures[J]. Energy Storage Science and Technology, 2021, 10(4): 1423-1431.

Figures/Tables 18

Table 1

Battery specifications"

参数	数值
容量/A $·$ h	3
电池直径/mm	26
电池高度/mm	65
电池重量/g	84
标称电压/V	3.2
放电截止电压/V	2.5
内阻/m $Ω$	28
径向导热系数/ $W · (K · m$ )^-1	0.98
轴向系数/ $W · (K · m$ )^-1	26.96
密度/ $k g · m - 3$	2059
比热容/ $J · (k g · K$ )^-1	1375

Table 1

Table 2

Basic parameters of PCM"

参数	数值
融化温度/℃	42
融化范围/℃	3
导热系数/ $W ? (K ? m$ )^-1	3.8
密度/ $k g · m - 3$	800
比热容/ $J · (k g · K$ )^-1	2000
相变潜热/ $k J · k g$ ^-1	192

Table 2

Fig. 1

Table 3

Heat generation rate of lithium-ion batteries under different discharge rates"

放电倍率/C	1	2	3	4	5
生热率/W $·$ m^-3	8173.9	30956.52	68347.83	120347.83	186956.52

Table 3

Fig. 2

Fig. 3

Fig. 4

Table 4

Fig. 5

Fig. 6

Table 5

Fig. 7

Fig. 8

Fig. 9

Fig. 10

Table 6

Fig. 11

Table 7

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放电倍率/C	1	2	3	4	5
电池组最高温度/℃	31.25	40.16	49.22	58.51	67.80
PCM-电池组最高温度/℃	29.93	35.68	41.01	41.96	42.17
最大温降/℃	1.32	4.48	8.21	16.55	25.63

最高温度/℃	放电倍率/C
最高温度/℃	3	5
PCM-电池组模型	41.01	42.17
3流道PCM-水套式液冷模型	35.46	41.73
6流道PCM-水套式液冷模型	33.78	41.11
最高温降	7.23	1.06

温度/℃	放电倍率/C
温度/℃	1	2	3	4	5
最低温度	26.42	29.66	32.69	35.80	38.68
最高温度	26.72	30.28	33.78	37.68	41.11
最大温差	0.30	0.62	1.09	1.88	2.43

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