[ Best Paper of This Month ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 30, No. 1, pp.53-59

ISSN: 2508-5107 (Online)

Print publication date 15 Feb 2021

Received 26 Nov 2020 Revised 21 Jan 2021 Accepted 02 Feb 2021

DOI: https://doi.org/10.7735/ksmte.2021.30.1.53

자동차 시동용 LFP 배터리 팩의 혹한기 시동성 향상을 위한 열선 시스템 적용에 따른 열 유동 해석

우영한^a^{, b} ; 강석원^b ; 이준숭^a ; 박문식^a ; 김성진^c ; 성동길^d ; 주성욱^a^{, *}

Numerical Analysis of Self-Heating Lithium Iron Phosphate Battery Systems for Enhanced Cold Startability

Younghan Woo^a^{, b} ; Seokwon Kang^b ; Junsoong Lee^a ; Moonsic Park^a ; Sungjin Kim^c ; Donggil Sung^d ; Sungwook Joo^a^{, *}

aMaterials Convergence Division, Gyeongbuk Hybrid Technology Institute
bDepartment of Automotive Engineering, Yeungnam University
cTechnology Research Institute, Bexel Co., Ltd
dTechnology Research Institute, CORN Co., Ltd

Correspondence to: ^*Tel.: +82-54-330-8066 E-mail address: jsw@ghi.re.kr (Sungwook Joo).

초록

A numerical simulation for evaluating thermal performance was performed to determine the possibility of replacing existing lead-acid 12 V batteries with lithium-ion batteries. In batteries used for starting vehicles, low-temperature (≤–20℃) starting performance and lifespan decrease significantly. Therefore, a lithium iron phosphate (LFP) battery system with a relatively high energy density at low temperatures was studied. A system for self-energy heating was designed to improve operability under cold-weather conditions. In particular, the battery pack case, battery cell array, and heating system of the proposed system were designed to be compatible. Furthermore, a thermal performance simulation was performed using computational fluid dynamics and heat transfer techniques based on the estimated thermal properties of each component. The results showed that the self-heating LFP battery pack system reached its startable temperature (–3℃) after 75 s when 249 W of power was applied in a low-temperature (–20℃) environment.

Keywords:

LFP battery pack, 12 V starter battery, Thermal flow analysis, Self-heating system, Low-temperature startability

Acknowledgments

“이 논문은 2019년도 광역협력권산업육성사업(주관기업: (주)벡셀, 과제번호: P0008663) 연구비 지원에 의하여 연구되었음.”

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Younghan Woo

Researcher in the Department of Materials Performance Evaluation, Gyeongbuk Hybrid Technology Institute.His research interest is secondary battery.

E-mail: wyh@ghi.re.kr

Seokwon Kang

Assistant professor in the Department of Automotive Engineering, Yeungnam University.His research interest is secondary battery.

E-mail: swkang@yu.ac.kr

Junsoong Lee

Researcher in the Department of Material Design Technology Research, Gyeongbuk Hybrid Technology Institute.His research interest is secondary battery.

E-mail: jslee@ghi.re.kr

Moonsic Park

Researcher in the Department of Material Design Technology Research, Gyeongbuk Hybrid Technology Institute.His research interest is secondary battery.

E-mail: pms8259@ghi.re.kr

Sungjin Kim

Team Leader in the Technology Research Institute, Bexel.His research interest is LFP battery cell manufacturing.

E-mail: ksj84@bexel.co.kr

Donggil Sung

Research Institute Director in the Technology Research Institute, CORN.His research interest is LFP battery pack manufacturing.

E-mail: dgsung.corn@gmail.com

Sungwook Joo

Team Leader in the Department of Materials Performance Evaluation, Gyeongbuk Hybrid Technology Institute.His research interest is secondary battery.

E-mail: jsw@ghi.re.kr