PD快充的电池电量是否不耐用

2019-07-26 极悦娱乐

随着PD快充周边市场的普及，PD充电头和PD充电宝已成为果粉日常充电用品。因为PD方案18W充电功率远大于标配5W，充电速度非常快，有用户怀疑PD快充的电池电量不耐用。

其实不然，iPhone电池采用(yong)的(de)(de)是锂离(li)子电(dian)(dian)(dian)池(chi)，锂离(li)子电(dian)(dian)(dian)池(chi)Li+ 通过(guo)在(zai)电(dian)(dian)(dian)池(chi)正(zheng)负极的(de)(de)转(zhuan)移来完成电(dian)(dian)(dian)池(chi)的(de)(de)充放(fang)(fang)电(dian)(dian)(dian)过(guo)程(cheng)。充放(fang)(fang)时，正(zheng)极的(de)(de)Li+ 通过(guo)电(dian)(dian)(dian)解(jie)质转(zhuan)移到负极，嵌(qian)入在(zai)负极碳(tan)结构内，嵌(qian)入的(de)(de)Li+越多，电(dian)(dian)(dian)池(chi)电(dian)(dian)(dian)量越大。放(fang)(fang)电(dian)(dian)(dian)过(guo)程(cheng)相反，负极Li+通过(guo)电(dian)(dian)(dian)解(jie)质重(zhong)新(xin)回到正(zheng)极。

PD协议对iPhone电(dian)池(chi)提(ti)供的电(dian)压(ya)(ya)和(he)电(dian)流(liu)值更大，正(zheng)极(ji)的锂(li)离子Li+ 运动到负极(ji)速度更快，不过电(dian)池(chi)内部化(hua)学反应也需(xu)要时间(jian)，一直(zhi)用快充(chong)(chong)(chong)模(mo)式充(chong)(chong)(chong)电(dian)的话，电(dian)池(chi)的容量不能(neng)完全饱和(he)。所以(yi)iPhone的充(chong)(chong)(chong)电(dian)方案(an)中有(you)恒流(liu)和(he)恒压(ya)(ya)两个阶段，恒流(liu)阶段iPhone以(yi)2A大电(dian)流(liu)快速充(chong)(chong)(chong)电(dian)至80%，此阶段为PD快充(chong)(chong)(chong)协议；之(zhi)后恒压(ya)(ya)阶段iPhone以(yi)5V电(dian)压(ya)(ya)缓慢(man)充(chong)(chong)(chong)电(dian)，电(dian)流(liu)越(yue)来越(yue)小，直(zhi)至最(zui)后涓流(liu)充(chong)(chong)(chong)满100%电(dian)量。此种方案(an)充(chong)(chong)(chong)电(dian)更快，而(er)且(qie)电(dian)量也能(neng)饱和(he)。