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

• Published in: 한국생산제조학회지 Vol. 30; no. 1; pp. 53 - 59
• Main Authors: 우영한(Younghan Woo), 강석원(Seokwon Kang), 이준숭(Junsoong Lee), 박문식(Moonsic Park), 김성진(Sungjin Kim), 성동길(Donggil Sung), 주성욱(Sungwook Joo)
• Format: Journal Article
• Language: Korean
• Published: 한국생산제조학회 01.02.2021
• Subjects: 기계공학; LFP battery pack; Self-heating system; 12 V starter battery; Low-temperature startability; Thermal flow analysis
• ISSN: 2508-5093; 2508-5107
• DOI: 10.7735/ksmte.2021.30.1.53

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. KCI Citation Count: 0