2022-08-11
高倍率(lv)可充电(dian)(dian)(dian)锂离子(zi)电(dian)(dian)(dian)池具有良好的潜力和发展前景,但要在兼(jian)顾现有系统的基础上(shang)(shang),在巩固现有锂离子(zi)电(dian)(dian)(dian)池的性价比、电(dian)(dian)(dian)路控制、安全性、高低温充放电(dian)(dian)(dian)和循环寿(shou)命等优势的基础上(shang)(shang),实现合理、安全的高倍率(lv)充电(dian)(dian)(dian)。
锂离子电池(chi)已逐渐成为世界(jie)各国军队使(shi)用的(de)(de)主要电池(chi)。其不仅能(neng)将(jiang)装备负(fu)重(zhong)减少约三(san)分之一,提(ti)高单(dan)兵战(zhan)术作战(zhan)的(de)(de)灵活性和(he)机动(dong)性,而且还能(neng)将(jiang)装备的(de)(de)作战(zhan)时(shi)(shi)间(jian)延长2 ~ 3倍,很大程度上提(ti)高单(dan)场任务的(de)(de)时(shi)(shi)效性和(he)可靠性。
高倍率(lv)锂离子电(dian)(dian)池(chi)充(chong)电(dian)(dian)时(shi)间(2~4h)短于镉镍电(dian)(dian)池(chi)、氢镍电(dian)(dian)池(chi)和铅酸(suan)电(dian)(dian)池(chi)(5~7h),但仍不能满足(zu)战(zhan)时(shi)的应急需(xu)求(qiu)。在伊(yi)拉克战(zhan)争中,美军一般使用一个电(dian)(dian)池(chi)来避免充(chong)电(dian)(dian)问(wen)题。在当(dang)天完成任(ren)务后(hou),旧电(dian)(dian)池(chi)被(bei)丢弃,换上新电(dian)(dian)池(chi),导(dao)致在战(zhan)争期间电(dian)(dian)池(chi)的后(hou)勤保障强度(du)大于弹药。为满足(zu)战(zhan)时(shi)装备充(chong)电(dian)(dian)等待时(shi)间(5~30min)的需(xu)要,锂离子电(dian)(dian)池(chi)理(li)论(lun)上可以高倍率(lv)充(chong)电(dian)(dian)(5~20C)。
锂(li)离子电(dian)(dian)(dian)(dian)池(chi)的阳极主要由碳(tan)构(gou)(gou)成。碳(tan)材料(liao)价廉(lian)易得(de),但首次充(chong)电(dian)(dian)(dian)(dian)不(bu)可逆(ni)容(rong)量高,循环性(xing)(xing)能差(cha),不(bu)适(shi)合(he)高倍(bei)率充(chong)电(dian)(dian)(dian)(dian)。Li4Ti5O12可用(yong)(yong)作(zuo)比容(rong)量为16的无碳(tan)负极材料(liao)5mAh/g,独特的尖晶石结构(gou)(gou)可提高电(dian)(dian)(dian)(dian)极的循环性(xing)(xing)能和使用(yong)(yong)寿(shou)命(ming),使电(dian)(dian)(dian)(dian)池(chi)具(ju)有良好(hao)的耐过(guo)充(chong)、过(guo)放电(dian)(dian)(dian)(dian)和安全(quan)性(xing)(xing)能,满足高倍(bei)率充(chong)电(dian)(dian)(dian)(dian)的要求。
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当这(zhei)(zhei)些锂(li)离子成为电(dian)(dian)子后,数据的(de)外部会产生(sheng)锂(li)原子晶(jing)体,这(zhei)(zhei)将形成像(xiang)过充电(dian)(dian)一(yi)(yi)(yi)样的(de)危险性。万(wan)一(yi)(yi)(yi)电(dian)(dian)池壳坏了,它就会爆炸。因此,锂(li)离子电(dian)(dian)池的(de)保护必须至(zhi)少(shao)包(bao)括:充电(dian)(dian)电(dian)(dian)压的(de)上限(xian)、放(fang)电(dian)(dian)电(dian)(dian)压的(de)下限(xian)和电(dian)(dian)流的(de)上限(xian)。一(yi)(yi)(yi)般情况下,除了锂(li)电(dian)(dian)池芯(xin)外,锂(li)电(dian)(dian)池组(zu)中会有一(yi)(yi)(yi)块保护板。这(zhei)(zhei)种保护板主要是(shi)提供这(zhei)(zhei)三种保护。1、内部化(hua)程度大;2.吸水性,与电(dian)(dian)解质反应;...
目前,聚(ju)合(he)物(wu)锂离(li)子电(dian)(dian)(dian)池主要(yao)采(cai)用限压限流(liu)的(de)充电(dian)(dian)(dian)方式。恒流(liu)(CC)充电(dian)(dian)(dian)初期,电(dian)(dian)(dian)池接受能力强(qiang)(qiang)。随着充电(dian)(dian)(dian)过(guo)程的(de)不断进行,极化效(xiao)应(ying)增(zeng)强(qiang)(qiang),温(wen)升(sheng)加剧,电(dian)(dian)(dian)压升(sheng)高(gao)。在恒压阶段(duan)有涓流(liu)充电(dian)(dian)(dian),大约用30%的(de)时(shi)间充10%的(de)电(dian)(dian)(dian),电(dian)(dian)(dian)流(liu)强(qiang)(qiang)度(du)减(jian)小(xiao),温(wen)升(sheng)不增(zeng)加。在此过(guo)程中,考虑聚(ju)合(he)物(wu)
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