Modeling the effect of fast charge on the cycle life of a lithium-ion battery and comparison with experimental data
Modeling the effect of fast charge on the cycle life of a lithium-ion battery and comparison with experimental data
- 주제(키워드) Lithium-ion battery , Fast charge scenario , Battery modeling , Cycling test
- 발행기관 아주대학교
- 지도교수 신치범
- 발행년도 2020
- 학위수여년월 2020. 2
- 학위명 박사
- 학과 및 전공 일반대학원 에너지시스템학과
- 실제URI http://www.dcollection.net/handler/ajou/000000029953
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
The fast charge for battery electric vehicle (BEV) is a possible route to reduce range anxiety and increase the utility. The fast charge is, however, reported to have negative effects on battery cycle life and performance. This thesis aims to develop modeling methodology of a lithium-ion battery (LIB) considering the effects of fast charge on cycle life for BEV applications. This thesis includes mathematical modeling for prediction battery cycle life, performance, and electrical/thermal behavior of LIBs and searching for the optimal fast charge protocol to improve cycle life of LIBs. To search for the optimal fast charge protocol, fast charge protocols are compared each other on factors affected cycle life such as temperature raise, temperature imbalance, and the imbalance of state of charge. To account for the aging effects of the LIB cell due to fast charge procedures, the key modeling parameters are expressed as a function of the square root of a novel modeling variable named as the accumulated thermal burden. The cycling tests are performed under the five different charge scenarios. The performance degradation of the aged LIB cell is different depending on charge techniques during cycling test. In order to validate the modeling methodology introduced in this thesis, the modeling results towards the changes of the discharge curves and two-dimensional temperature distributions of the aged LIB cell under five different charge scenarios are compared with the experimental measurements. The electrical and thermal behaviors predicted by the modeling for the aged LIB cell such as capacity fade, cell voltage drop under load, and peak temperature rise show good agreement with the experimental data.
more목차
Chapter 1. Introduction 1
1.1. Lithium-ion battery 1
1.2. Thermal effects in lithium-ion batteries 5
1.3. Issues of the fast charge of lithium-ion batteries 5
1.4. Dissertation outline 9
Chapter 2. Mathematical model 11
Chapter 3. Experimental 21
3.1. Rated capacity test 22
3.2. Hybrid pulse power characterization test 32
3.3. Reference performance test 35
3.4. Cycling test 42
Chapter 4. Results and discussion 45
4.1. Search for the optimal fast charge protocol 45
4.2. Modeling the electrical and thermal behaviors of a lithium-ion battery during fast charge 59
4.3. Modeling the effect of fast charge on the cycle of a lithium-ion battery… 68
Chapter 5. Summary and conclusions 84
Bibliography 85
Appendix A. Nomenclature 90
Appendix B. Battery glossary 94
Appendix C. Experimental for all of the different charge scenarios 95
국 문 초 록 116
