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近(jin)年來智能手(shou)機、數碼(ma)相機、便(bian)攜(xie)式音頻設(she)備和藍牙設(she)備等越來越多的產品采用鋰電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)作為(wei)主要電(dian)(dian)(dian)(dian)(dian)(dian)源，由于(yu)鋰電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)具有(you)體積(ji)小、能量密(mi)度高(gao)、無記憶效應、循環壽(shou)命高(gao)、高(gao)電(dian)(dian)(dian)(dian)(dian)(dian)壓電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)和自放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)率低等優點，與(yu)鎳氫電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)、鎳鎘(ge)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)不(bu)太一樣，鋰電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)必須考慮充電(dian)(dian)(dian)(dian)(dian)(dian)、放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)時的安全性，因為(wei)鋰電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)過度充電(dian)(dian)(dian)(dian)(dian)(dian)和過度放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)都會給(gei)鋰電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)帶(dai)來危害(hai)，那么(me)鋰電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)過度放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)對鋰電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)有(you)什么(me)危害(hai)呢?

一、什么是過度放電

所謂過度放(fang)(fang)電(dian)是指電(dian)池(chi)放(fang)(fang)電(dian)時，貯存的電(dian)能逐步釋放(fang)(fang)，電(dian)壓緩慢下降。當電(dian)壓降低到某一規定值時應停止放(fang)(fang)電(dian)，重新充(chong)電(dian)以恢復(fu)電(dian)池(chi)的貯能狀態。低于此規定值繼續放(fang)(fang)電(dian)，即為過度放(fang)(fang)電(dian)。

二、過度放電對鋰電池有什么危害

鋰電池過放電經常給鋰電池帶來災難性的后果，尤其是大電流過放電或反復過放電，這對鋰電池的電氣性能有較大的影響。

這就像一個人一次失血300到500毫升，不會影響一個人的健康。然而，一旦失血過多，一個人的正常身體功能就無法維持，在一定程度上，人就會死亡。對于鋰電池，過度放電會增加鋰電池的內部壓力，正、負極活性物質的可逆功能被破壞。即使通過充電進行補救，也很難全部恢復。自然容量明顯減弱，鋰電池衰減到一定程度報廢，沒有辦法讓報廢的電池復活。

因此為了避免鋰電池過度放電的危害，我們應該根據鋰電池本身的特性在早期設置保護參數，并在以后使用它們，我們應嚴格遵守使用說明書中的“鋰電池使用規定”。