集成技术
集成技術
집성기술
Journal of Integration Technology
2015年
1期
51-59
,共9页
刘恒伟%李建军%谢潇怡%方谋%王莉%何向明%欧阳明高%李茂刚
劉恆偉%李建軍%謝瀟怡%方謀%王莉%何嚮明%歐暘明高%李茂剛
류항위%리건군%사소이%방모%왕리%하향명%구양명고%리무강
锂离子电池%发热量%熵变热%焦耳热%热管理
鋰離子電池%髮熱量%熵變熱%焦耳熱%熱管理
리리자전지%발열량%적변열%초이열%열관리
lithium-ion battery%heating generation%entropy change heat%joule heat%thermal management
利用绝热加速量热仪提供绝热环境,研究了三元软包锂离子动力电池在不同倍率充放电时的发热行为。锂离子电池内部的总热量由可逆的熵变热和不可逆的焦耳热组成。进一步研究结果表明,电池发热量的大小主要由充放电倍率决定:低倍率充放电时电池发热量较小,0.2C倍率时电池温度上升7.16℃,熵变热有明显的体现;高倍率充放电时焦耳热占主导地位,熵变热几乎可以忽略,1C倍率时电池温度上升25.63℃。同一倍率下放电过程发热量大于充电过程,放电过程中电池荷电状态为0~10%时,直流内阻突然增大,此处电池发热功率最大。该研究对锂离子电池热管理的散热设计有一定的参考价值。
利用絕熱加速量熱儀提供絕熱環境,研究瞭三元軟包鋰離子動力電池在不同倍率充放電時的髮熱行為。鋰離子電池內部的總熱量由可逆的熵變熱和不可逆的焦耳熱組成。進一步研究結果錶明,電池髮熱量的大小主要由充放電倍率決定:低倍率充放電時電池髮熱量較小,0.2C倍率時電池溫度上升7.16℃,熵變熱有明顯的體現;高倍率充放電時焦耳熱佔主導地位,熵變熱幾乎可以忽略,1C倍率時電池溫度上升25.63℃。同一倍率下放電過程髮熱量大于充電過程,放電過程中電池荷電狀態為0~10%時,直流內阻突然增大,此處電池髮熱功率最大。該研究對鋰離子電池熱管理的散熱設計有一定的參攷價值。
이용절열가속량열의제공절열배경,연구료삼원연포리리자동력전지재불동배솔충방전시적발열행위。리리자전지내부적총열량유가역적적변열화불가역적초이열조성。진일보연구결과표명,전지발열량적대소주요유충방전배솔결정:저배솔충방전시전지발열량교소,0.2C배솔시전지온도상승7.16℃,적변열유명현적체현;고배솔충방전시초이열점주도지위,적변열궤호가이홀략,1C배솔시전지온도상승25.63℃。동일배솔하방전과정발열량대우충전과정,방전과정중전지하전상태위0~10%시,직류내조돌연증대,차처전지발열공솔최대。해연구대리리자전지열관리적산열설계유일정적삼고개치。
In this work the thermal behavior of the LiNi1/3Co1/3Mn1/3O2 cathode material for soft packed lithium-ion power batteries during charging and discharging at differentC-rate were conducted using the ARC (accelerating rate calorimeter) to provide an adiabatic environment. The overall heat generated by the lithium-ion battery during use, is partly reversible and partly irreversible, due to entropy change and joule heating, respectively. It indicates that the heating generation of lithium-ion cell is decided by theC-rate of charge and discharge. The heat is smaller at lowC-rate of charge and discharge. For example, the heating generation of battery increases 7.16℃ at 0.2C-rate and the entropy change heat is clearly embodied. The joule heating is more remarkable than the entropy change during charging and discharging at high C-rate. For instance, the heating generation of cell increased 25.63℃ at 1C-rate. The heat generation of charge is less than discharge at the sameC-rate. The DC inter insistence of cell at the SOC (State of Charge) of 0 to 10% increases suddenly, so the heating generation power will reach its maximum in this period during discharge. It is valuable for the design of heat dissipation in lithium-ion battery thermal management.