2022-06-27
锂电(dian)(dian)(dian)(dian)(dian)池(chi)的(de)(de)充(chong)放(fang)电(dian)(dian)(dian)(dian)(dian)性(xing)能会受到(dao)温度(du)的(de)(de)影响(xiang),其(qi)电(dian)(dian)(dian)(dian)(dian)化学反应(ying)与环境温度(du)有关,电(dian)(dian)(dian)(dian)(dian)极/电(dian)(dian)(dian)(dian)(dian)解液(ye)界面被视为电(dian)(dian)(dian)(dian)(dian)池(chi)的(de)(de)心脏(zang)。低温会降(jiang)低电(dian)(dian)(dian)(dian)(dian)解质粘度(du)、电(dian)(dian)(dian)(dian)(dian)导率、活(huo)性(xing)物质的(de)(de)活(huo)性(xing),使(shi)电(dian)(dian)(dian)(dian)(dian)解液(ye)的(de)(de)浓(nong)度(du)差变大(da),极化增(zeng)强,使(shi)充(chong)电(dian)(dian)(dian)(dian)(dian)提(ti)前终止。温度(du)的(de)(de)降(jiang)低,还会使(shi)电(dian)(dian)(dian)(dian)(dian)极反应(ying)速(su)度(du)下(xia)降(jiang)。如(ru)果电(dian)(dian)(dian)(dian)(dian)池(chi)电(dian)(dian)(dian)(dian)(dian)压(ya)不变,放(fang)电(dian)(dian)(dian)(dian)(dian)电(dian)(dian)(dian)(dian)(dian)流减(jian)小,电(dian)(dian)(dian)(dian)(dian)池(chi)的(de)(de)输出功率也会减(jian)小。
磷(lin)酸铁(tie)锂(li)电(dian)(dian)(dian)池(chi)(chi)是电(dian)(dian)(dian)动(dong)汽车中(zhong)应用(yong)广泛的电(dian)(dian)(dian)池(chi)(chi),其安全性高、使用(yong)寿(shou)命(ming)长。但(dan)它存在一(yi)个(ge)致命(ming)的缺点,其低(di)(di)温(wen)性能略逊(xun)于(yu)其他(ta)电(dian)(dian)(dian)池(chi)(chi)。低(di)(di)温(wen)对磷(lin)酸铁(tie)锂(li)的正(zheng)负(fu)极(ji)、电(dian)(dian)(dian)解(jie)(jie)液和胶粘(zhan)剂均有影(ying)(ying)响。由于(yu)正(zheng)极(ji)本身(shen)电(dian)(dian)(dian)子导电(dian)(dian)(dian)性差,在低(di)(di)温(wen)下(xia)容易产生极(ji)化,从而降(jiang)低(di)(di)电(dian)(dian)(dian)池(chi)(chi)容量;电(dian)(dian)(dian)解(jie)(jie)液粘(zhan)度会(hui)因低(di)(di)温(wen)而增加(jia),锂(li)离子迁移阻抗(kang)也会(hui)增加(jia)。另外,在磷(lin)酸铁(tie)锂(li)的生产过程中(zhong),粘(zhan)接(jie)(jie)剂也是一(yi)个(ge)非常关键(jian)的因素,低(di)(di)温(wen)也会(hui)对粘(zhan)接(jie)(jie)剂的性能产生很大的影(ying)(ying)响。
在低温下充(chong)电(dian)(dian)(dian)或(huo)使用锂电(dian)(dian)(dian)池(chi)(chi)前,需要(yao)对电(dian)(dian)(dian)池(chi)(chi)预加(jia)(jia)热(re)(re)(re)(re)。BMS可以通过(guo)外(wai)部(bu)加(jia)(jia)热(re)(re)(re)(re)和内(nei)部(bu)加(jia)(jia)热(re)(re)(re)(re)两种方式对电(dian)(dian)(dian)池(chi)(chi)进行加(jia)(jia)热(re)(re)(re)(re)。外(wai)部(bu)加(jia)(jia)热(re)(re)(re)(re)方式包括(kuo)空气加(jia)(jia)热(re)(re)(re)(re)、液体加(jia)(jia)热(re)(re)(re)(re)、相变材料(liao)加(jia)(jia)热(re)(re)(re)(re)、热(re)(re)(re)(re)阻加(jia)(jia)热(re)(re)(re)(re)器或(huo)热(re)(re)(re)(re)泵加(jia)(jia)热(re)(re)(re)(re)。这些加(jia)(jia)热(re)(re)(re)(re)方法通常位于电(dian)(dian)(dian)池(chi)(chi)组或(huo)设置在热(re)(re)(re)(re)循环介(jie)质的(de)容(rong)器中(zhong)。内(nei)部(bu)加(jia)(jia)热(re)(re)(re)(re)法是(shi)通过(guo)交流电(dian)(dian)(dian)流刺激电(dian)(dian)(dian)池(chi)(chi)内(nei)部(bu)的(de)电(dian)(dian)(dian)化学材料(liao)加(jia)(jia)热(re)(re)(re)(re)电(dian)(dian)(dian)池(chi)(chi),使电(dian)(dian)(dian)池(chi)(chi)本身产生热(re)(re)(re)(re)量。
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聚合物锂电(dian)池(chi)电(dian)芯(xin)采用柔性包(bao)(bao)(bao)装(zhuang),可确(que)保电(dian)芯(xin)的(de)性能(neng)不(bu)受损坏,必须小心操(cao)作(zuo)电(dian)芯(xin)。1、铝箔包(bao)(bao)(bao)装(zhuang)材(cai)料(liao):(1)铝箔包(bao)(bao)(bao)装(zhuang)材(cai)料(liao)容易被(bei)尖(jian)锐的(de)部件损坏,如镍片、尖(jian)针;(2)请勿用尖(jian)锐物品撞击电(dian)池(chi);(3)清洁(jie)工作(zuo)环境,以免存在(zai)尖(jian)锐物品;(4)禁止用钉子等尖(jian)锐物品刺穿锂电(dian)池(chi)
锂电(dian)(dian)池(chi)参数不一致(zhi)主要是指容(rong)量(liang)、内(nei)阻和(he)开路电(dian)(dian)压的(de)不一致(zhi)。如果锂电(dian)(dian)池(chi)的(de)电(dian)(dian)芯不一致(zhi),则会出现(xian)以下问题:1、容(rong)量(liang)损耗。锂电(dian)(dian)池(chi)的(de)电(dian)(dian)芯单体组成电(dian)(dian)池(chi)组,容(rong)量(liang)符合 “木桶(tong)原理”。差(cha)的(de)电(dian)(dian)芯的(de)容(rong)量(liang)决定了(le)整个锂电(dian)(dian)池(chi)组的(de)容(rong)量(liang)。2、使用(yong)寿命(ming)损失(shi)。同样(yang),锂电(dian)(dian)池(chi)组的(de)寿命(ming)由寿命(ming)
锂(li)(li)离子(zi)电池(chi)的(de)容量由正(zheng)极(ji)材(cai)料(liao)的(de)活(huo)性(xing)(xing)锂(li)(li)离子(zi)和负(fu)极(ji)材(cai)料(liao)嵌(qian)入和脱锂(li)(li)的(de)能(neng)(neng)力决(jue)定(ding)(ding)。正(zheng)负(fu)极(ji)在各种环境下的(de)稳定(ding)(ding)性(xing)(xing)决(jue)定(ding)(ding)了(le)(le)电池(chi)的(de)性(xing)(xing)能(neng)(neng),甚(shen)至(zhi)严重影响(xiang)了(le)(le)电池(chi)的(de)安全性(xing)(xing)。因此,电极(ji)的(de)性(xing)(xing)能(neng)(neng)在一定(ding)(ding)程(cheng)度上决(jue)定(ding)(ding)了(le)(le)锂(li)(li)离子(zi)电池(chi)的(de)整体性(xing)(xing)能(neng)(neng)。目前,商用锂(li)(li)离子(zi)电池(chi)负(fu)极(ji)材(cai)料(liao)主(zhu)要(yao)为石墨基碳负(fu)极(ji)材(cai)料(liao),
直接作为(wei)正极(ji)材(cai)料的(de)(de)(de)金属锂(li)具有很高(gao)的(de)(de)(de)可(ke)(ke)逆容量(liang),其理论(lun)容量(liang)高(gao)达3862mAh.g1,是(shi)石(shi)墨材(cai)料的(de)(de)(de)十倍(bei)以上(shang),价格也(ye)很低(di)。它被(bei)认为(wei)是(shi)新一(yi)代锂(li)离子电(dian)池(chi)具吸引力的(de)(de)(de)阳极(ji)材(cai)料,但它会产生枝晶锂(li)。利用固(gu)体电(dian)解(jie)质(zhi)(zhi)作为(wei)阳极(ji)材(cai)料是(shi)可(ke)(ke)能的(de)(de)(de)。此外(wai),聚合物锂(li)电(dian)池(chi)的(de)(de)(de)固(gu)体电(dian)解(jie)质(zhi)(zhi)可(ke)(ke)以
近工程师们开发出了一种(zhong)低(di)(di)温(wen)(wen)(wen)磷酸(suan)铁(tie)锂(li)(li)电(dian)(dian)池(chi)(chi)(chi),能够在低(di)(di)至零下(xia)60摄氏度的(de)温(wen)(wen)(wen)度下(xia)保持正常的(de)温(wen)(wen)(wen)度性能。目前可以(yi)投(tou)放市(shi)场的(de)低(di)(di)温(wen)(wen)(wen)电(dian)(dian)池(chi)(chi)(chi)主要有(you)低(di)(di)温(wen)(wen)(wen)磷酸(suan)铁(tie)锂(li)(li)电(dian)(dian)池(chi)(chi)(chi)和聚合物低(di)(di)温(wen)(wen)(wen)锂(li)(li)电(dian)(dian)池(chi)(chi)(chi),这两种(zhong)低(di)(di)温(wen)(wen)(wen)电(dian)(dian)池(chi)(chi)(chi)技术都比(bi)较成熟(shu)。与目前在零下(xia)20摄氏度停止工作的(de)锂(li)(li)离子电(dian)(dian)池(chi)(chi)(chi)相比(bi),磷酸(suan)铁(tie)锂(li)(li)电(dian)(dian)
锂(li)(li)(li)电池电解(jie)(jie)(jie)液(ye)(ye)常见有两(liang)种类型,即(ji)高(gao)端(duan)(duan)电解(jie)(jie)(jie)液(ye)(ye)和常规电解(jie)(jie)(jie)液(ye)(ye),其价(jia)(jia)格需要(yao)根据原(yuan)材(cai)料(liao)的(de)(de)采购(gou)价(jia)(jia)格来(lai)计(ji)算的(de)(de)。一般锂(li)(li)(li)电池电解(jie)(jie)(jie)液(ye)(ye)厂家(jia)都会添加(jia)净化(hua)的(de)(de)费用,所(suo)以每(mei)个部件的(de)(de)价(jia)(jia)格比例会有所(suo)不同。锂(li)(li)(li)电池高(gao)端(duan)(duan)电解(jie)(jie)(jie)液(ye)(ye)通常具备(bei)高(gao)浓度(du)锂(li)(li)(li)盐、特殊添加(jia)剂、特殊配方(fang)的(de)(de)特点,只要(yao)电解(jie)(jie)(jie)液(ye)(ye)满足(zu)三个