An experimental study on the thermal characteristics of the Cell-To-Pack system

Huaibin Wang; Shuyu Wang; Xuning Feng; Xuan Zhang; Kangwei Dai; Jun Sheng; Zhenyang Zhao; Zhiming Du; Zelin Zhang; Kai Shen; Chengshan Xu; Qinzheng Wang; Xiaoyu Sun; Yanliang Li; Jiaju Ling; Jiani Feng; Hewu Wang; Minggao Ouyang

doi:10.1016/j.energy.2021.120338

An experimental study on the thermal characteristics of the Cell-To-Pack system

Huaibin Wang, Shuyu Wang, Xuning Feng^*, Xuan Zhang, Kangwei Dai^*, Jun Sheng, Zhenyang Zhao, Zhiming Du, Zelin Zhang, Kai Shen, Chengshan Xu, Qinzheng Wang, Xiaoyu Sun, Yanliang Li, Jiaju Ling, Jiani Feng, Hewu Wang, Minggao Ouyang

^*Corresponding author for this work

School of Mechatronical Engineering

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

The development of electric vehicle batteries has resulted in high energy density battery pack. Cell-to-Pack (CTP) omits the cell module assembly, can reduce battery pack parts by 40%, improve the battery pack volume utilization rate by 15%–20%. However, the thermal characteristics of CTP under full operating conditions has yet to be verified, the CTP temperature calibration cycle under full working condition is time-consuming, and little analysis has been conducted on CTP internal temperature differentials and heat flow. The present study aims to thermal characteristics of CTP. Results show that CTP temperature calibration based on a thermal resistance grid can realize internal temperature reconstruction, optimum temperature arrangement, and shorten the calibration period by more than 60%. In addition, higher ambient temperatures can increase the maximum temperature of the jelly rolls in CTP cells, while lower ambient temperature can lead to larger differences in jelly roll temperature within a cell; and high-speed driving and fast charging can lead to the highest temperature increase rates under different working conditions up to 0.05 °C s⁻¹.70% of the heat generated during cell discharge is used for self-heating, and the heat dissipation of liquid cooled plate is the main heat dissipation channel.

Original language	English
Article number	120338
Journal	Energy
Volume	227
DOIs	https://doi.org/10.1016/j.energy.2021.120338
Publication status	Published - 15 Jul 2021

Keywords

Battery safety
Cell-to-Pack
Lithium-ion battery
Thermal characteristics
Thermal management

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.energy.2021.120338

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title = "An experimental study on the thermal characteristics of the Cell-To-Pack system",

abstract = "The development of electric vehicle batteries has resulted in high energy density battery pack. Cell-to-Pack (CTP) omits the cell module assembly, can reduce battery pack parts by 40%, improve the battery pack volume utilization rate by 15%–20%. However, the thermal characteristics of CTP under full operating conditions has yet to be verified, the CTP temperature calibration cycle under full working condition is time-consuming, and little analysis has been conducted on CTP internal temperature differentials and heat flow. The present study aims to thermal characteristics of CTP. Results show that CTP temperature calibration based on a thermal resistance grid can realize internal temperature reconstruction, optimum temperature arrangement, and shorten the calibration period by more than 60%. In addition, higher ambient temperatures can increase the maximum temperature of the jelly rolls in CTP cells, while lower ambient temperature can lead to larger differences in jelly roll temperature within a cell; and high-speed driving and fast charging can lead to the highest temperature increase rates under different working conditions up to 0.05 °C s−1.70% of the heat generated during cell discharge is used for self-heating, and the heat dissipation of liquid cooled plate is the main heat dissipation channel.",

keywords = "Battery safety, Cell-to-Pack, Lithium-ion battery, Thermal characteristics, Thermal management",

author = "Huaibin Wang and Shuyu Wang and Xuning Feng and Xuan Zhang and Kangwei Dai and Jun Sheng and Zhenyang Zhao and Zhiming Du and Zelin Zhang and Kai Shen and Chengshan Xu and Qinzheng Wang and Xiaoyu Sun and Yanliang Li and Jiaju Ling and Jiani Feng and Hewu Wang and Minggao Ouyang",

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year = "2021",

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day = "15",

doi = "10.1016/j.energy.2021.120338",

language = "English",

volume = "227",

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issn = "0360-5442",

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T1 - An experimental study on the thermal characteristics of the Cell-To-Pack system

AU - Wang, Huaibin

AU - Wang, Shuyu

AU - Feng, Xuning

AU - Zhang, Xuan

AU - Dai, Kangwei

AU - Sheng, Jun

AU - Zhao, Zhenyang

AU - Du, Zhiming

AU - Zhang, Zelin

AU - Shen, Kai

AU - Xu, Chengshan

AU - Wang, Qinzheng

AU - Sun, Xiaoyu

AU - Li, Yanliang

AU - Ling, Jiaju

AU - Feng, Jiani

AU - Wang, Hewu

AU - Ouyang, Minggao

PY - 2021/7/15

Y1 - 2021/7/15

N2 - The development of electric vehicle batteries has resulted in high energy density battery pack. Cell-to-Pack (CTP) omits the cell module assembly, can reduce battery pack parts by 40%, improve the battery pack volume utilization rate by 15%–20%. However, the thermal characteristics of CTP under full operating conditions has yet to be verified, the CTP temperature calibration cycle under full working condition is time-consuming, and little analysis has been conducted on CTP internal temperature differentials and heat flow. The present study aims to thermal characteristics of CTP. Results show that CTP temperature calibration based on a thermal resistance grid can realize internal temperature reconstruction, optimum temperature arrangement, and shorten the calibration period by more than 60%. In addition, higher ambient temperatures can increase the maximum temperature of the jelly rolls in CTP cells, while lower ambient temperature can lead to larger differences in jelly roll temperature within a cell; and high-speed driving and fast charging can lead to the highest temperature increase rates under different working conditions up to 0.05 °C s−1.70% of the heat generated during cell discharge is used for self-heating, and the heat dissipation of liquid cooled plate is the main heat dissipation channel.

AB - The development of electric vehicle batteries has resulted in high energy density battery pack. Cell-to-Pack (CTP) omits the cell module assembly, can reduce battery pack parts by 40%, improve the battery pack volume utilization rate by 15%–20%. However, the thermal characteristics of CTP under full operating conditions has yet to be verified, the CTP temperature calibration cycle under full working condition is time-consuming, and little analysis has been conducted on CTP internal temperature differentials and heat flow. The present study aims to thermal characteristics of CTP. Results show that CTP temperature calibration based on a thermal resistance grid can realize internal temperature reconstruction, optimum temperature arrangement, and shorten the calibration period by more than 60%. In addition, higher ambient temperatures can increase the maximum temperature of the jelly rolls in CTP cells, while lower ambient temperature can lead to larger differences in jelly roll temperature within a cell; and high-speed driving and fast charging can lead to the highest temperature increase rates under different working conditions up to 0.05 °C s−1.70% of the heat generated during cell discharge is used for self-heating, and the heat dissipation of liquid cooled plate is the main heat dissipation channel.

KW - Battery safety

KW - Cell-to-Pack

KW - Lithium-ion battery

KW - Thermal characteristics

KW - Thermal management

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VL - 227

JO - Energy

JF - Energy

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ER -

An experimental study on the thermal characteristics of the Cell-To-Pack system

Abstract

Keywords

UN SDGs

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