Effect of thermal characteristics of lithium-ion battery charging and discharging equipment on air cooling

doi:10.19799/j.cnki.2095-4239.2023.0688

Abstract

Abstract:

This study focused on air-cooling methods to address challenges associated with high temperature and consistent thermal distribution in battery packs with lithium-ion battery charging and discharging equipment. This study establishes a thermodynamic calculation model based on numerical heat transfer theory, which was validated through practical testing. By abstracting heat dissipation characteristics, two main factors influencing the thermal behavior of battery packs are identified. Various research schemes are devised to explore diverse tray ventilation structures and fan layouts. The study analyzes the effects of different tray vents, tray annular vents, fan locations, and fan quantities on the thermal characteristics of battery packs and the associated flow fields in lithium-ion battery charging and discharging equipment. Results demonstrate that rise in temperature during equipment discharge closely aligns with simulation data, affirming the accuracy of the thermodynamic model. While tray vents positively affect the thermal characteristics of the battery pack, their effect is somewhat limited. Notably, annular vents on the tray emerge as crucial contributors, enhancing turbulent kinetic energy and convective heat transfer on the battery surface. Optimal heat transfer is achieved when the fan directly faces the batteries, and the number of fans positively correlates with battery pack thermal characteristics. With six fans, the system meets the thermal performance requirements of the battery pack and improves overall energy consumption. The research results offer valuable insights for effectively managing the thermal characteristics of lithium-ion battery charging and discharging equipment.

Key words: air cooling, lithium-ion battery, charging and discharging equipment, thermal characteristics, numerical simulation

CLC Number:

TM 911

Jian LIU, Libo YU, Zhenxing WU, Jiegang MOU. Effect of thermal characteristics of lithium-ion battery charging and discharging equipment on air cooling[J]. Energy Storage Science and Technology, 2024, 13(3): 914-923.

Figures/Tables 14

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指标	数值	指标	数值
尺寸/mm	Φ 46xH 95	放电截止电压/V	2.8
容量/Ah	30	充电上限电压/V	4.2
内阻/mΩ	1.25	质量/g	421
额定电压/V	3.7	能量密度/(Wh/kg)	280

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