磷酸铁锂电(dian)(dian)池(chi)包和电(dian)(dian)池(chi)组怎样串并联使用？磷酸铁锂电(dian)(dian)池(chi)包串并联有哪些注意事项？

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并(bing)联包的特点是(shi)：电(dian)(dian)(dian)(dian)(dian)压不变，电(dian)(dian)(dian)(dian)(dian)池容量相加，内(nei)阻(zu)减(jian)小，可供电(dian)(dian)(dian)(dian)(dian)时间延长。并(bing)联(lian)(lian)充电(dian)(dian)(dian)(dian)(dian)的核心内(nei)容是(shi)并(bing)联(lian)(lian)电(dian)(dian)(dian)(dian)(dian)流(liu)的大小及其作(zuo)用。根据并(bing)联(lian)(lian)理论，干路电(dian)(dian)(dian)(dian)(dian)流(liu)等于各(ge)支路电(dian)(dian)(dian)(dian)(dian)流(liu)之和，因此，已(yi)经组(zu)合为电(dian)(dian)(dian)(dian)(dian)池组(zu)的n节并联锂电池要达到与单节电池相同的充电效率，充电电流应为n个锂电池电流之和，在欧姆定律：I=U/R的公式下，这个设计是合理的。

但是，并(bing)联(lian)后(hou)的(de)电(dian)(dian)池(chi)内(nei)(nei)阻(zu)(zu)也会(hui)起变化，按照并(bing)联(lian)内(nei)(nei)阻(zu)(zu)公(gong)式(shi)，两(liang)个(ge)并(bing)联(lian)锂电(dian)(dian)池(chi)的(de)总(zong)内(nei)(nei)阻(zu)(zu)等于(yu)两(liang)个(ge)电(dian)(dian)池(chi)内(nei)(nei)阻(zu)(zu)乘积与其内(nei)(nei)阻(zu)(zu)相加(jia)之和的(de)比值，并(bing)联(lian)电(dian)(dian)阻(zu)(zu)会(hui)随着并(bing)联(lian)电(dian)(dian)池(chi)数量(liang)的(de)增(zeng)加(jia)而递减。所以，磷酸铁锂电(dian)(dian)池(chi)组并(bing)联(lian)充电(dian)(dian)的(de)效率可以在电(dian)(dian)流小于(yu)n个并联锂电池电流之和的基础上实现。

磷酸(suan)铁锂电池(chi)包(bao)串并联注意事项：

⒈不(bu)要将不(bu)同(tong)(tong)品牌磷酸铁(tie)锂电(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)包，不(bu)同(tong)(tong)容(rong)量或新旧锂电(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)混在一(yi)起使用，选(xuan)择性能一(yi)致的(de)电(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)。当电(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)的(de)电(dian)(dian)(dian)(dian)量不(bu)足时(shi)，更换所有(you)的(de)电(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)。锂电(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)包串联使用时(shi)，要用同(tong)(tong)一(yi)种类(lei)型的(de)电(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)。要注意(yi)电(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)的(de)极性，如果有(you)一(yi)节电(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)的(de)极性装反了，就会减少(shao)整串电(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)的(de)电(dian)(dian)(dian)(dian)压，而不(bu)是增加电(dian)(dian)(dian)(dian)压。

⒉如(ru)果将不同容(rong)量(liang)或新(xin)旧锂(li)电(dian)(dian)池包混在(zai)一起使用,有可能(neng)出现(xian)漏(lou)液,零(ling)电(dian)(dian)压等现(xian)象。这是(shi)由于充(chong)电(dian)(dian)过(guo)程中，容(rong)量(liang)差异导致(zhi)充(chong)电(dian)(dian)时有些电(dian)(dian)池被(bei)过(guo)充(chong)，有些电(dian)(dian)池未充(chong)满电(dian)(dian)，放电(dian)(dian)时有容(rong)量(liang)高的电(dian)(dian)池未放完电(dian)(dian)，而容(rong)量(liang)低的则被(bei)过(guo)放。如(ru)此恶性(xing)循环，电(dian)(dian)池受到(dao)损害而漏(lou)液或低（零(ling)）电(dian)(dian)压。

⒊一般磷酸铁锂(li)电(dian)池包串并(bing)联使(shi)用需要进行锂(li)电(dian)池芯(xin)(xin)(xin)配对，配对的标准：锂(li)电(dian)池芯(xin)(xin)(xin)电(dian)压差(cha)≤10mV，锂(li)电(dian)池芯(xin)(xin)(xin)内阻差(cha)≤5mΩ，锂(li)电(dian)池芯(xin)(xin)(xin)容量差(cha)≤20mA。

⒋拆除锂电(dian)池组保(bao)护(hu)(hu)电(dian)路板，看好电(dian)池保(bao)护(hu)(hu)板能否(fou)用(yong)在你串联或(huo)并联的电(dian)路上，比如：以(yi)前是4.2V的保(bao)护(hu)(hu)板，给(ji)你串联成(cheng)8.4V，那电(dian)池保(bao)护(hu)(hu)板就不能再用(yong)了。