Thermal management performance of batteries with embedded tree-like fins for phase transition layers

doi:10.19799/j.cnki.2095-4239.2022.0577

Abstract

Abstract:

Due to the low thermal conductivity of the phase change materials (PCM) in the cooling battery, the copper tree fins embedded in the envelope structure of the PCM are proposed to release heat in time. A mathematical model was established to describe the dynamic melting and heat transfer process of the tree-finned PCM using the enthalpy-porosity method. The influence of the envelope with the tree-finned PCM of different structures on the cell temperature was numerically analyzed at discharge rates of 1 C, 2 C, and 3 C. Compared with using paraffins as the envelopes, the cell temperature can be reduced by 1.4 K with straight fins. When embedded with tree fins, however, the cell temperature can be reduced by 1.4 K compared to that with straight fins. When the ratio of the branch length to trunk length is 1.2, the PCM envelope embedded with tree fins can obtain better heat transfer characteristics for battery thermal management systems.

Key words: phase change material, finned structure, battery thermal management

CLC Number:

TM 911

Xueqing SHEN, Wei CHEN. Thermal management performance of batteries with embedded tree-like fins for phase transition layers[J]. Energy Storage Science and Technology, 2023, 12(2): 459-467.

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物性	单位	锂离子电池	石蜡	铜	丙烯酸
尺寸	mm	Φ18 × 65	—	—	—
密度	kg/m³	2720	820	8978	1215
比热容	J/(kg·K）	300	2000	381	1300
质量	g	44.5	—	—	—
热导率	W/(m·K)	3	0.2	387.6	0.17
动力黏度	kg/(m·s)	—	0.02	—	—
热扩散系数	K^-1	—	0.0001	—	—
相变潜热	J/kg	—	165000	—	—
固相温度	K	—	311.15	—	—
液相温度	K	—	316.15	—	—
额定电压	V	3.6	—	—	—
额定容量	Ah	2.4	—	—	—
内阻	mΩ	30	—	—	—

项目		平均温度/℃	误差/%
网格数N	1664	328.548	0.623
	2446	327.216	0.215
	3789	326.671	0.048
	8248	326.513	基准
时间步长Δt/s	0.1	325.115	0.454
	0.08	326.079	0.158
	0.05	326.483	0.035
	0.01	326.597	基准

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