Theoretical Analysis of the Thermal Resistance Network for Battery Thermal Management

Lian, Yubo; Liu, Jianjian; Liao, Yinsheng; Xu, Haolun

doi:10.4271/2022-01-5087

SAE Technical Paper Series

2022

DOI: 10.4271/2022-01-5087

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Theoretical Analysis of the Thermal Resistance Network for Battery Thermal Management

Yubo Lian¹,

Jianjian Liu²,

Yinsheng Liao³

et al.

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Cited by 2 publications

References 29 publications

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Numerical investigation on nucleate bubble departure by electrowetting-on-dielectric in battery cooling plates

Xu,

Yu,

Liu

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part D:

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A thermal management system is necessary to control battery operating temperature in electric vehicles (EV). Typically, the most common way to dissipate heat from the battery pack is to use the cooling plate. The cooling medium in the cooling plate removes the excess heat from the battery pack through boiling heat transfer. This paper proposes an electrowetting-on-dielectric (EWOD) method to enhance the bubble departure in nucleate boiling heat transfer in a cooling plate. In order to investigate the bubble splitting due to the EWOD effect, theoretical models are developed to solve for the electrophoretic force, dielectrophoretic force, and electrostrictive force. The theoretical model coupled a phase field method with an electric conservation model, where the body force acts as an external force due to the electric field. Our preliminary simulation results demonstrated that the EWOD effect can change the apparent contact angle when applied to a certain electric field. The free charge density displays at the dielectric layer interface with water and at the bubble’s interface near the triple contact point. Then two types of simulation case were investigated to apply the voltage in the battery cooling plates. In the first case, a pair of parallel discs are used as the electrodes at the bottom and top of the region. In the second case, the voltage is applied at the top of the nucleate bubble in a rod electrode. The various behavior of bubble dynamics were compared and discussed to indicate the optimized case for enhancing the nucleate bubble departure in the EV battery cooling plates.

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Numerical investigation on nucleate bubble departure by electrowetting-on-dielectric in battery cooling plates

Xu,

Yu,

Liu

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part D:

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show abstract

Enhanced Thermal Management in Oil Spray-Cooled Motors: A Novel Approach to Replacing NTC Sensors

Lu,

Li,

Chen

et al. 2024

SAE Int. J. Elec. Veh.

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<div>Motor temperature plays a critical role in controlling pump speed and regulating coolant flow to prevent overheating during motor operation. Presently, negative temperature coefficient (NTC) sensors are commonly used for motor temperature measurement, typically installed at the motor winding’s end for ease of installation. However, in oil spray-cooled motors, the temperature distribution is uneven due to the spray pipe, leading to lower temperatures near the pipe compared to other areas. This results in a challenge where relying solely on NTC measurements at the winding end may not meet the motor’s cooling requirements. To address this issue and improve temperature signal accuracy, a novel approach has been developed that utilizes four signals derived from the motor controller: motor speed, motor torque, along with oil pump speed, oil temperature. Employing the lumped parameter method, a model established in Simulink aims to estimate the average temperature in the motor’s high-temperature region. Subsequently, this value is corrected and directly utilized as an input signal for motor thermal management. The proposed approach not only enhances motor temperature monitoring accuracy but also mitigates operational risks, thereby prolonging motor lifespan and enhancing its overall safety.</div>

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Theoretical Analysis of the Thermal Resistance Network for Battery Thermal Management

Cited by 2 publications

References 29 publications

Numerical investigation on nucleate bubble departure by electrowetting-on-dielectric in battery cooling plates

Numerical investigation on nucleate bubble departure by electrowetting-on-dielectric in battery cooling plates

Enhanced Thermal Management in Oil Spray-Cooled Motors: A Novel Approach to Replacing NTC Sensors

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