CAJ | 학술논문

动力电池的安全性一直是电动汽车行业关注的焦点。本文对某款磷酸铁锂动力电池，进行了针刺、挤压、热箱等安全滥用测试，以研究该款电池在不同循环时期的安全性变化规律。分析了该电池在经历100~500次循环周期测试后的热稳定性参数和电池循环寿命的关系。结果表明：以自生热放热起始点为参照，循环前的电池并不具有最高的热活性；随着循环次数的增加，该款电池的热活性先增强后减弱。这一现象可归结为：电池循环过程中，电池内部活性物质逐渐活化，逐渐发挥到最佳性能，之后活性又逐渐降低。
동력전지적안전성일직시전동기차행업관주적초점。본문대모관린산철리동력전지，진행료침자、제압、열상등안전람용측시，이연구해관전지재불동순배시기적안전성변화규률。분석료해전지재경력100~500차순배주기측시후적열은정성삼수화전지순배수명적관계。결과표명：이자생열방열기시점위삼조，순배전적전지병불구유최고적열활성；수착순배차수적증가，해관전지적열활성선증강후감약。저일현상가귀결위：전지순배과정중，전지내부활성물질축점활화，축점발휘도최가성능，지후활성우축점강저。
The safety of lithium-ion traction batteries is a key point during the development of electric vehicles. Some safety abuse tests, such as the penetration test, the crush test and the heat test, were done to investigate the safety characteristic change in different cycles for a lithium iron phosphate power battery. The relationship between the thermal abuse behavior parameters and the battery cycle life was analyzed before and after 100~500 cycles. The results show that according to the starting point of self-heating, fresh batteries have not the highest thermal activities;battery thermal activities ifrstly increase, then decrease along with the cycle time increasing . This phenomenon can be attributed to that the active materials in battery activate gradual y to achieve the best performance, afterwards decrease with increasing cycles.