Thermal management of a 48 V pouch lithium-ion battery pack based on high rate discharge condition

doi:10.19799/j.cnki.2095-4239.2020.0338

Abstract

Abstract:

Recently, 48 V light hybrid vehicles have been frequently seen as a transition product from fuel vehicles to electric vehicles. The 48 V battery pack can drive a more powerful vehicle system, and it is easy to generate high discharge rate during normal use. Controlling the battery temperature below 45 ℃ is necessary to efficiently run the battery under the premise of high safety performance. Therefore, it is very important to study the thermal management of the battery pack. With the pouch lithium iron phosphate battery as the research object, we study the mechanism for battery thermogenesis using multiple battery monomers in test experiments of resistance and electromotive force coefficients of temperature rise and machine learning polynomial regression for data processing. At the same time, the temperature distribution characteristics of the battery were investigated, and a relatively perfect battery heat generation model was obtained. Because of the battery cell's structural characteristics and thermal conductivity, it is difficult to export the battery heat produced. In this paper, using aluminum, heat pipe, and graphene materials, we designed the heat dissipation structure of the 48 V soft package battery pack. The temperature evolution rule of the battery pack was revealed through simulations, and the temperature control mechanism of the heat dissipation structure of the battery was explored. The battery pack's heat dissipation structure can control the battery's temperature below 45 ℃ and the temperature difference between the battery cell and the battery pack within 2 ℃, ensuring a safe and efficient operation of the battery pack under high rate discharge conditions.

Key words: 48 V pouch battery pack, heat generation model, machine learning, battery thermal management

CLC Number:

TM 912

Kuining LI, Cheng HE, Yi XIE, Bin LIU, Shasha DENG. Thermal management of a 48 V pouch lithium-ion battery pack based on high rate discharge condition[J]. Energy Storage Science and Technology, 2021, 10(2): 679-688.

Figures/Tables 19

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参数	数值
标称容量/A·h	8
标称电压/V	3.3
充电截止电压/V	3.65
放电截止电压/V	2.4
工作温度/℃	-30～5
重量/g	330
尺寸	4.8 mm×160 mm×227 mm

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