Cooling Characteristics and Optimization of an Air-Cooled Battery Pack Tianjin University

Format:

Book

Conference/Event

Author/Creator:

Zhang, Junhong, author.

Contributor:

Dai, Huwei

Lin, Jiewei

Liu, Ting

Conference Name:

SAE 2024 Vehicle Powertrain Diversification Technology Forum (2024-12-06 : Xi'An, China)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2025

Summary:

Lithium-iron phosphate batteries are widely used in energy storage systems and electric vehicle for their favorable safety profiles and high reliability. The designing of an efficient cooling system is an effective means of ensuring normal battery operation, improving cycle life, and preventing thermal runaway. In this paper, we proposed a forced-convection air cooling structure aiming at uniform temperature distribution and reducing the maximum temperature. The initial step was constructing a heating model for a single LiFeO4 battery. A source function was derived from the experimental data, which described the variation in heating power with discharge depth. This function was then used to create a dynamic loading of the battery heating model. Subsequently, a three-dimensional model of a 7-series and 2-parallel battery pack was constructed. Seven schemes were designed on the basis of the traditional Z-shaped structure, with the position of the air inlet and outlet altered. The analysis found that the inlet and outlet positions affect the temperature of the battery pack, and the optimal positional scheme can control the temperature rise at the end of battery discharge within 18.54 K. On this basis, we added some disturbing structures near the high-temperature battery, which reduced the maximum temperature and maximum temperature difference by 4.32 K and 5.45 K, respectively. This proves to be a highly efficient cooling structure, which realizes the improvement of the cooling effect on the basis of not changing the external structure of the battery. In addition to optimizing the structure, we also investigated the effects of six different temperature levels and five different air inlet velocities on the performance of the air-cooling system. The results showed that both lowering the air temperature and increasing the air velocity have a positive effect on the cooling performance

Notes:

Vendor supplied data

Publisher Number:

2025-01-7016

Access Restriction:

Restricted for use by site license