Effects of Local Thermal Accumulation Conditions on the Thermal Characteristics of Lithium-Ion Batteries under High-Rate Charging

Yuan, Qingchun; Xu, Xiaoming; Zhu, Lei; Tong, Guangyao

doi:10.1061/(asce)ey.1943-7897.0000707

Cited by 8 publications

(4 citation statements)

References 18 publications

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“…During the simulation of battery heating using a battery simulator, the polarization heat and side-reaction heat were disregarded, with a focus instead on reaction heat and Joule heat for the design. The determination of reaction heat and Joule heat can be accomplished using Equations ( 3) and ( 4) [41].…”

Section: Properties Methanol Novec7100mentioning

confidence: 99%

“…Figure 4 shows the heat generation of a battery caused by a chemical reaction, ac cording to the C-rate (Current(A)/Battery capacity(Ah)). The heat is calculated by follow ing Equation (2) [41].…”

Section: Properties Methanol Novec7100mentioning

confidence: 99%

“…where Q is the total heat generation of the battery, 𝑄𝑄 𝑅𝑅 is the reaction heat, 𝑄𝑄 𝑝𝑝 is the po larization heat, 𝑄𝑄 𝑠𝑠 is the side-reaction heat and 𝑄𝑄 𝐽𝐽 is the Joule heat. During the simula tion of battery heating using a battery simulator, the polarization heat and side-reactio heat were disregarded, with a focus instead on reaction heat and Joule heat for the design The determination of reaction heat and Joule heat can be accomplished using Equation ( 3) and ( 4) [41].…”

Section: Properties Methanol Novec7100mentioning

confidence: 99%

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Anti-Gravity 3D Pulsating Heat Pipe for Cooling Electric Vehicle Batteries

Lee,

Kim,

Han

et al. 2024

Energies

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This study proposes an anti-gravity 3D pulsating heat pipe (PHP) for cooling pouch batteries in electric vehicles. The 3D PHP envelops the battery cells and rapidly transfers heat generated from the batteries to the bottom cold plate. While the batteries generate heat on their frontal surface during charging and discharging, structural characteristics lead to localized heat accumulation at the electrode lead tabs. Therefore, to address frontal heating, Pattern A with a consistent height for the 3D PHP and Pattern B with varying heights to enhance heat transfer in the localized heating area were designed. The target application involved creating a battery simulator for 340 × 100 mm pouch battery cells, considering the battery’s heat generation characteristics. The experiments for the thermal characteristics were conducted, considering factors such as the working fluid (methanol, Novec7100), filling ratio, supplied heat, and orientation. Additionally, to observe internal flow mechanisms, a special experimental apparatus was used, employing transparent fluorine rubber tubes to observe the flow mechanism of the 3D PHP. In the results of the thermal characteristics, the optimal filling ratio was 15% when heat generation levels of 50 W and 100 W were supplied and 20% when 150 W was supplied. The impact of orientation yielded varied results depending on the pattern and working fluid, attributed to the complex interplay of flow momentum due to orientation changes and the influence of the working fluid’s buoyancy under anti-gravity conditions. Pattern B, designed with the goal of applying a localized heat model, exhibited relatively decreased heat transfer performance in areas with varying heights. As the distance from the varying height portion increased, temperature oscillations and heat transfer became more active. These results suggest that variations in the shape of the 3D PHP could be a primary design variable for crafting localized heat models. Observations of internal flow revealed that the 3D PHP, with its unique shape and operation under anti-gravity conditions, exhibits longer and more irregular cycles compared to gravity-assist PHPs, transferring heat through rapid oscillations of internal working fluid liquid/vapor slug/plug. The potential of 3D PHPs for cooling electric vehicle batteries is suggested by these findings, and further experimentation is planned to evaluate the optimal design and applicability.

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Section: Properties Methanol Novec7100mentioning

confidence: 99%

Section: Properties Methanol Novec7100mentioning

confidence: 99%

Section: Properties Methanol Novec7100mentioning

confidence: 99%

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Anti-Gravity 3D Pulsating Heat Pipe for Cooling Electric Vehicle Batteries

Lee,

Kim,

Han

et al. 2024

Energies

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show abstract

“…According to research, abuse situations that lead to thermal runaway of batteries can generally be divided into mechanical abuse, electrical abuse, and thermal abuse [11][12][13][14][15]. Among them, mechanical abuse includes squeezing, acupuncture, and collision, while electrical abuse includes internal short circuit, overcharge (overdischarge), and thermal abuse includes overheating, flame burning, and other situations [16].…”

Section: Introductionmentioning

confidence: 99%

Toxicity, Emissions and Structural Damage from Lithium-Ion Battery Thermal Runaway

Zhou¹,

Sun²,

Li³

et al. 2023

Batteries

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Toxicity, emissions and structural damage results on lithium-ion battery (LIB) thermal runaway triggered by the electrothermal method were performed in this work. The electrothermal triggering method was determined to study the thermal runaway behaviors of three types of commercial LIBs. The structural damage of the cathode material of the batteries after thermal runaway was observed by scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD). It was found that as the state of charge (SOC) of the battery increases, the lower the temperature at which thermal runaway occurs, and the more badly the structural damage of the electrode material after thermal runaway. Qualitative analysis of products from LIBs thermal runaway emissions was conducted by GC-MS, and the toxicity and formation mechanism of the emissions were analyzed in detail. Dozens of toxic substances were detected from the emissions after thermal runaway of batteries using LixNi1/3Co1/3Mn1/3O2 and LiCoO2 as the cathode material, the types of toxic substances increase gradually with the increase in the SOC, while as for batteries using LiFePO4 as the cathode material, most types of toxic substances were detected from 30% SOC.

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STTEWS: A sequential-transformer thermal early warning system for lithium-ion battery safety

Dong

Xiong

et al. 2022

Applied Energy

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Effects of Local Thermal Accumulation Conditions on the Thermal Characteristics of Lithium-Ion Batteries under High-Rate Charging

Cited by 8 publications

References 18 publications

Anti-Gravity 3D Pulsating Heat Pipe for Cooling Electric Vehicle Batteries

Anti-Gravity 3D Pulsating Heat Pipe for Cooling Electric Vehicle Batteries

Toxicity, Emissions and Structural Damage from Lithium-Ion Battery Thermal Runaway

STTEWS: A sequential-transformer thermal early warning system for lithium-ion battery safety

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