摘要
为评价不同化学体系动力电池的发热性能,以电池发热功率与总功率的比值(即发热耗散率,B_(HDR))作为评价指标,其值越低,电池发热性能越好。使用绝热加速量热仪,测试磷酸铁锂(LFP)、钛酸锂(LTO)、镍钴锰酸锂(NCM)和锰酸锂(LMO)正极锂离子电池,以及金属氢化物-镍(MH/Ni)电池的发热性能。1 C放电倍率下,NCM锂离子电池的B_(HDR)为2.36%,发热性能最好;LFP锂离子电池、LMO锂离子电池的B_(HDR)小于5.00%,发热性能较好;LTO锂离子电池、MH/Ni电池的B_(HDR)为5.00%~8.00%,发热性能较差。随着放电倍率增大,所有电池B_(HDR)均显著增加,提供的有效能量减少;LTO锂离子电池放电过程的B_(HDR)高于充电过程;LFP、LTO锂离子电池在-5~5℃的B_(HDR)更高,发热性能更差。
In order to evaluate the thermal performance of power battery with different chemical systems,the ratio of the battery heating power to the total power(heat dissipation rate,B_(HDR))was used as the assessment criteria.The lower the value,the better the battery thermal performance.The thermal performance of lithium iron phosphate(LFP),lithium titanate(LTO),nickel-cobalt-manganese lithium(NCM)and lithium manganese oxide(LMO)cathode Li-ion battery,nickel metal hydride(MH/Ni)battery were tested by accelerating rate calorimeter.The B_(HDR) of NCM Li-ion battery was 2.36%under discharge rate of 1 C,the thermal performance was the best.The B_(HDR) of LFP Li-ion battery and LMO Li-ion battery were less than 5.00%,the thermal performance was better.The B_(HDR) of LTO Li-ion battery and MH/Ni battery were between 5.00%-8.00%,the thermal performance was poor.With the increase of discharge rate,the B_(HDR) of all batteries increased significantly and the provided effective energy decreased.The B_(HDR) of LTO Li-ion battery in discharging was higher than that in charging.LFP and LTO Li-ion batteries had higher B_(HDR) and worse thermal performance at-5-5℃.
作者
包有玉
余剑武
郭力
范光辉
BAO You-yu;YU Jian-wu;GUO Li;FAN Guang-hui(College of Mechanical and Vehicle Engineering,Hunan University,Changsha,Hunan 410082,China;College of Shenzhen International Graduate,Tsinghua University,Shenzhen,Guangdong 518055,China)
出处
《电池》
CAS
北大核心
2022年第3期281-284,共4页
Battery Bimonthly
基金
湖南省自然科学基金(2020JJ4205)。
