摘要：本應用筆(bi)記(ji)簡單介紹了鎳(nie)鎘(NiCd)、鎳(nie)氫(qing)(NiMH)和(he)鋰離(li)子(zi)(Li-Ion，Li+)可(ke)充(chong)電(dian)電(dian)池,討論它們的性(xing)能，并說明在不需(xu)要微控制器的情況下如(ru)何構建單機結構，安全(quan)、快(kuai)速地為鎳(nie)氫(qing)和(he)鋰離(li)子(zi)電(dian)池充(chong)電(dian)。

車載充電器摘要：本(ben)應(ying)用筆記(ji)簡單(dan)介紹了(le)鎳(nie)(nie)(nie)鎘(NiCd)、鎳(nie)(nie)(nie)氫(qing)(NiMH)和(he)鋰離子(zi)(Li-Ion，Li+)可充電(dian)(dian)(dian)電(dian)(dian)(dian)池,討(tao)論它們的性能，并說明在不(bu)需要微控制器的情況(kuang)下如何構建單(dan)機結構，安(an)全(quan)、快(kuai)速地(di)為鎳(nie)(nie)(nie)氫(qing)和(he)鋰離子(zi)電(dian)(dian)(dian)池充電(dian)(dian)(dian)。概述充電(dian)(dian)(dian)電(dian)(dian)(dian)池已經成為當今電(dian)(dian)(dian)子(zi)產(chan)品的一種(zhong)標準(zhun)電(dian)(dian)(dian)源(yuan)，特別是便攜設備：筆記(ji)本(ben)電(dian)(dian)(dian)腦、手(shou)機、數碼相機。盡管電(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)壓在不(bu)斷(duan)降低，但可充電(dian)(dian)(dian)電(dian)(dian)(dian)池消耗的絕對功(gong)率仍在不(bu)斷(duan)增(zeng)大。功(gong)耗增(zeng)長的主要原因(yin)是設備功(gong)能的增(zeng)強，例如：數碼相機與手(shou)機的功(gong)能整

　　概(gai)述(shu)充(chong)(chong)電(dian)(dian)電(dian)(dian)池(chi)(chi)已(yi)經成為(wei)當(dang)今(jin)電(dian)(dian)子產(chan)品的(de)(de)一種(zhong)標準電(dian)(dian)源，特別(bie)是便(bian)攜設(she)備：筆記本電(dian)(dian)腦、手機、數碼相(xiang)機。盡管電(dian)(dian)源電(dian)(dian)壓在不斷(duan)降低，但(dan)可(ke)(ke)充(chong)(chong)電(dian)(dian)電(dian)(dian)池(chi)(chi)消耗(hao)的(de)(de)絕對(dui)功(gong)率仍在不斷(duan)增大(da)(da)。功(gong)耗(hao)增長(chang)的(de)(de)主要(yao)原因是設(she)備功(gong)能(neng)(neng)的(de)(de)增強，例(li)如(ru)：數碼相(xiang)機與手機的(de)(de)功(gong)能(neng)(neng)整(zheng)合，筆記本電(dian)(dian)腦更(geng)高的(de)(de)運(yun)算速度以及大(da)(da)尺寸屏幕的(de)(de)需求(qiu)等(deng)等(deng)。便(bian)攜設(she)備功(gong)耗(hao)的(de)(de)增大(da)(da)使得(de)用(yong)可(ke)(ke)充(chong)(chong)電(dian)(dian)電(dian)(dian)池(chi)(chi)要(yao)比標準電(dian)(dian)池(chi)(chi)性(xing)價比更(geng)高。更(geng)為(wei)重要(yao)的(de)(de)是，可(ke)(ke)充(chong)(chong)電(dian)(dian)電(dian)(dian)池(chi)(chi)更(geng)有(you)利于環保。使用(yong)充(chong)(chong)電(dian)(dian)電(dian)(dian)池(chi)(chi)可(ke)(ke)極(ji)大(da)(da)地減少有(you)害物(wu)質的(de)(de)排(pai)放、材料的(de)(de)消耗(hao)、以及生產(chan)同等(deng)一次性(xing)電(dian)(dian)池(chi)(chi)所需的(de)(de)能(neng)(neng)源。

　　本文介紹了可(ke)充(chong)電(dian)(dian)電(dian)(dian)池的化學(xue)成分；同時說(shuo)明(ming)了各種充(chong)電(dian)(dian)電(dian)(dian)池的典型特征和(he)選(xuan)擇電(dian)(dian)池類型時需要重點注意的事項。另(ling)外還討論了在(zai)不使用(yong)微控制器(qi)或電(dian)(dian)源浪(lang)涌的主適(shi)配器(qi)的情況下如何構建單機結構，安全、快速地對鎳氫和(he)鋰(li)離子充(chong)電(dian)(dian)電(dian)(dian)池進行充(chong)電(dian)(dian)。

　　可(ke)充電(dian)(dian)電(dian)(dian)池(chi)類型20世(shi)紀80年代(dai)的便攜設備(bei)，如數字無繩電(dian)(dian)話、隨身聽(ting)和電(dian)(dian)動剃須(xu)刀等，主要由(you)鎳鎘(NiCd)電(dian)(dian)池(chi)供(gong)電(dian)(dian)。到了90年代(dai)后期，鎳氫(NiMH)電(dian)(dian)池(chi)和鋰離子(zi)(Li-Ion)電(dian)(dian)池(chi)逐(zhu)漸進入市場并開始(shi)流(liu)行。

　　因(yin)為價(jia)格比鎳氫和鋰離子電(dian)(dian)池便宜，鎳鎘電(dian)(dian)池在低端應用中十分普遍。鎳鎘電(dian)(dian)池可(ke)提供最高(gao)的(de)放電(dian)(dian)電(dian)(dian)流，適(shi)合(he)短時(shi)間內需要大功率輸出的(de)應用。

　　另一(yi)方(fang)面，鎳(nie)鎘(ge)電池曾經被所謂(wei)的(de)記憶效應(ying)困擾(現在的(de)鎳(nie)鎘(ge)電池很少考慮這個因素)，使電池容量降低。如果鎳(nie)鎘(ge)電池在未完全(quan)放電的(de)情(qing)況下再充(chong)電，一(yi)些活(huo)性物質會(hui)累(lei)積并且開始結晶(在陽(yang)極有100μm的(de)鎘(ge)累(lei)積層)，通過化(hua)學反應(ying)這層物質會(hui)自行消失(shi)(一(yi)塊全(quan)新電池的(de)陽(yang)極大約有1微米厚度的(de)鎘(ge)結晶)。

　　出(chu)現記憶效應會(hui)導(dao)致電(dian)(dian)池(chi)容量越來越小，端(duan)(duan)電(dian)(dian)壓越來越低，使得電(dian)(dian)池(chi)到(dao)達(da)最低可用端(duan)(duan)電(dian)(dian)壓(關斷點(dian))的(de)時(shi)間比預期(qi)(qi)的(de)早許多，如圖1所示。鎳(nie)(nie)鎘(ge)電(dian)(dian)池(chi)的(de)另一個缺(que)點(dian)是(shi)它的(de)活性物質中含有(you)有(you)毒的(de)鎘(ge)(Cd)，早期(qi)(qi)的(de)鎳(nie)(nie)鎘(ge)電(dian)(dian)池(chi)在處理(li)時(shi)會(hui)產生和成本問題(ti)。。所以，歐洲法規2000/53/EG在2005年12月31號后銷售鎳(nie)(nie)鎘(ge)充電(dian)(dian)電(dian)(dian)池(chi)。

　　鎳氫電池比鎳鎘電池更環保，但是價格更貴。鎳氫電池的放電電流略小，但受惰性效應的影響。惰性效應是比鎳鎘電池記憶效應稍輕的一種現象。惰性效應是由于鎳的結晶導致的。惰性效應和記憶效應一樣，導致無法完全使用可充電電池的全部容量，但都可以通過使用帶有放電功能的充電器來避免。

　　圖1.鎳鎘(ge)電池的記憶效應與鎳氫電池的惰性效應之間的比(bi)較

　　鋰電子可(ke)充電電池(chi)價格(ge)最高，但(dan)具(ju)有(you)足(zu)夠高的能量密(mi)度，因而(er)可(ke)以在給定尺(chi)(chi)寸下提供更(geng)優性(xing)能，更(geng)適合小(xiao)尺(chi)(chi)寸、高集成度的便攜設備。

　　表(biao)1給出了(le)各種(zhong)類型電池(chi)的(de)主(zhu)要特性。

　　表1.各種類型充電電池概(gai)述

　　MaximumDischargeCurrent>5C<3C<2C

　　室溫下。

　　C=電池容量。

　　單機鎳氫電池快速充電器雖然很多人更偏愛鋰(li)離(li)子電池，鎳(nie)氫(qing)電池的(de)使(shi)用依(yi)然很流行。因為(wei)鎳(nie)氫(qing)電池比(bi)鋰(li)離(li)子電池便宜很多，所(suo)以在MP3播放(fang)器(qi)、閃光(guang)燈配件、車燈等設備中經常能看到標準(zhun)的(de)AA和AAA鎳(nie)氫(qing)電池。

　　一塊可充(chong)(chong)電(dian)(dian)(dian)鎳氫電(dian)(dian)(dian)池的(de)溫度和(he)端電(dian)(dian)(dian)壓(ya)隨著電(dian)(dian)(dian)池的(de)充(chong)(chong)電(dian)(dian)(dian)逐步上升，在(zai)電(dian)(dian)(dian)池完全充(chong)(chong)滿后開(kai)始(shi)下降(圖2)。所以(yi)，鎳氫電(dian)(dian)(dian)池充(chong)(chong)電(dian)(dian)(dian)器(qi)的(de)主要任(ren)務(wu)是檢(jian)測到這(zhe)個突變(bian)點并中(zhong)斷充(chong)(chong)電(dian)(dian)(dian)，或(huo)者從快(kuai)速充(chong)(chong)電(dian)(dian)(dian)切換到涓流(liu)充(chong)(chong)電(dian)(dian)(dian)。另外，在(zai)充(chong)(chong)電(dian)(dian)(dian)過程中(zhong)對溫度和(he)電(dian)(dian)(dian)壓(ya)進行連續可以(yi)提供系統的(de)安全性。

　　圖(tu)2.這些曲(qu)線顯示了NiMH充電電池充電過程中典(dian)型的電壓(頂部(bu))和溫(wen)度(底部(bu))隨時間的變化

　　DS2711/DS2712充電器具(ju)備上述功(gong)能。另外，它們(men)可(ke)(ke)以單機工作，不需要微控(kong)制器或微處(chu)理器。該系(xi)列產品是(shi)(shi)專門為單節(jie)AA或AAA可(ke)(ke)充(chong)電(dian)電(dian)池設計的(de)，同時(shi)也適(shi)用(yong)于或并聯的(de)兩節(jie)電(dian)池。DS2711采(cai)用(yong)線性控(kong)制結構，DS2712采(cai)用(yong)開關控(kong)制結構。為了最大限(xian)度地延長工作時(shi)間、節(jie)約電(dian)池能量，這些充(chong)電(dian)器有4種(zhong)充(chong)電(dian)模式：預充(chong)電(dian)、快速(su)(su)充(chong)電(dian)、浮充(chong)和(he)涓流充(chong)電(dian)。在浮充(chong)模式下，電(dian)池充(chong)滿后充(chong)電(dian)速(su)(su)率被切換到一個比較(jiao)低的(de)速(su)(su)率(對于DS2711而言是(shi)(shi)25%)。

　　簡(jian)單充(chong)電(dian)(dian)機電(dian)(dian)路(lu)圖(tu)除功(gong)能(neng)外(wai)(wai)，DS2711/DS2712充(chong)電(dian)(dian)器還(huan)帶有內(nei)部(bu)計(ji)時(shi)(shi)(shi)器，通過連接到(dao)TMR引腳(jiao)的外(wai)(wai)部(bu)電(dian)(dian)阻設(she)定(ding)最大充(chong)電(dian)(dian)時(shi)(shi)(shi)間(jian)(jian)，可將(jiang)快(kuai)速充(chong)電(dian)(dian)時(shi)(shi)(shi)間(jian)(jian)設(she)置在0.5到(dao)10小時(shi)(shi)(shi)。浮充(chong)時(shi)(shi)(shi)間(jian)(jian)已(yi)經(jing)設(she)定(ding)為最大充(chong)電(dian)(dian)時(shi)(shi)(shi)間(jian)(jian)的一半(0.25到(dao)5小時(shi)(shi)(shi))。根(gen)據所(suo)要求的充(chong)電(dian)(dian)時(shi)(shi)(shi)間(jian)(jian)(TAPPROX)，由(you)下式(shi)計(ji)算電(dian)(dian)阻值：

　　R=1000TAPPROX/1.5

　　快(kuai)速充(chong)電(dian)模(mo)式(shi)下，如果超過最大充(chong)電(dian)時(shi)間，充(chong)電(dian)器會從(cong)快(kuai)速充(chong)電(dian)模(mo)式(shi)切(qie)換(huan)到(dao)浮(fu)充(chong)模(mo)式(shi)，同時(shi)復位計(ji)時(shi)器。計(ji)時(shi)器開(kai)始為浮(fu)充(chong)過程計(ji)時(shi)，如果達到(dao)預定的浮(fu)充(chong)時(shi)間，充(chong)電(dian)器將從(cong)浮(fu)充(chong)模(mo)式(shi)切(qie)換(huan)到(dao)涓(juan)流模(mo)式(shi)(圖3)。

　　圖3.該典型(xing)應用(yong)電中(zhong)，DS2711電池充(chong)電器為2個的鎳氫充(chong)電電池充(chong)電

　　VP1、VP2用(yong)于(yu)電(dian)(dian)(dian)(dian)壓(ya)，THM1、THM2配合熱敏電(dian)(dian)(dian)(dian)阻(zu)用(yong)來監(jian)測電(dian)(dian)(dian)(dian)池的溫度。TMR(計時(shi)器)和(he)RSNS(檢(jian)流電(dian)(dian)(dian)(dian)阻(zu))用(yong)于(yu)設(she)定充(chong)電(dian)(dian)(dian)(dian)時(shi)間和(he)充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流。DS2711/DS2712的另外一個特(te)性(xing)是可以檢(jian)測電(dian)(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)(dian)故障(zhang)和(he)堿(jian)性(xing)原電(dian)(dian)(dian)(dian)池。如果發生這些(xie)情況，充(chong)電(dian)(dian)(dian)(dian)器會自(zi)行關機。該特(te)性(xing)十分重要，因(yin)為(wei)如果給堿(jian)性(xing)電(dian)(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)(dian)會造(zao)成電(dian)(dian)(dian)(dian)池泄(xie)漏，產生有(you)害(hai)的液(ye)體(ti)和(he)/或氣體(ti)。有(you)毒氣體(ti)以及會與周圍(wei)材料起反應(ying)的液(ye)體(ti)通常會損壞電(dian)(dian)(dian)(dian)和(he)/或外圍(wei)設(she)備(bei)。

　　如何檢測(ce)堿性(xing)電(dian)(dian)(dian)(dian)(dian)池(chi)全新的(de)(de)(de)(de)鎳(nie)氫AA電(dian)(dian)(dian)(dian)(dian)池(chi)的(de)(de)(de)(de)典型內(nei)阻(zu)在(zai)30mΩ到100mΩ，堿性(xing)電(dian)(dian)(dian)(dian)(dian)池(chi)的(de)(de)(de)(de)內(nei)阻(zu)一(yi)般在(zai)200mΩ到300mΩ(根據充(chong)電(dian)(dian)(dian)(dian)(dian)狀態(tai)，最(zui)高(gao)可(ke)到700mΩ)，出現故障的(de)(de)(de)(de)充(chong)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)池(chi)會有很高(gao)的(de)(de)(de)(de)內(nei)阻(zu)。DS2711/DS2712通過(guo)檢測(ce)到的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)(dian)壓(VP1和(he)VP2)和(he)已設定(ding)的(de)(de)(de)(de)充(chong)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流可(ke)以計算(suan)出待充(chong)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)池(chi)的(de)(de)(de)(de)內(nei)阻(zu)。

　　CTST引腳(用(yong)于電(dian)(dian)池(chi)(chi)測試、設(she)置(zhi)門限)控制電(dian)(dian)池(chi)(chi)內阻的(de)測量。VCTST是充(chong)(chong)電(dian)(dian)過程中的(de)電(dian)(dian)池(chi)(chi)電(dian)(dian)壓減去無充(chong)(chong)電(dian)(dian)電(dian)(dian)流時的(de)開(kai)電(dian)(dian)池(chi)(chi)電(dian)(dian)壓(OCV)后的(de)差值(zhi)。這個值(zhi)等于充(chong)(chong)電(dian)(dian)電(dian)(dian)流乘以電(dian)(dian)池(chi)(chi)內阻的(de)乘積。如(ru)果檢測引腳(VP1、VP2和VN1)與電(dian)(dian)池(chi)(chi)沒有采用(yong)Kelvin連接，引線(xian)電(dian)(dian)阻也將計(ji)入測量值(zhi)，影響VCTST。計(ji)算外部電(dian)(dian)阻RCTST的(de)公(gong)式(shi)為：

　　RCTST=8000[V2/A]/VCTST,whereVCTST=ICharge×RCELL

　　圖4.圖3中所示充電器的充電流程

　　單(dan)機鋰(li)(li)離(li)子電(dian)(dian)(dian)池快速充(chong)電(dian)(dian)(dian)器因(yin)為不(bu)需要(yao)檢測電(dian)(dian)(dian)壓(ya)(ya)變化率(dV/dt)，鋰(li)(li)離(li)子電(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)器比鎳氫電(dian)(dian)(dian)池簡單(dan)。同時，由于鋰(li)(li)離(li)子電(dian)(dian)(dian)池對過充(chong)非常，充(chong)電(dian)(dian)(dian)器需要(yao)一個精確的4.2V±50mV電(dian)(dian)(dian)源(yuan)恒電(dian)(dian)(dian)流充(chong)電(dian)(dian)(dian)。至于鎳氫電(dian)(dian)(dian)池，充(chong)電(dian)(dian)(dian)器不(bu)僅需要(yao)電(dian)(dian)(dian)壓(ya)(ya)監(jian)測，還需要(yao)其它功能(溫(wen)度(du)、計(ji)時等)。

　　單機鋰離子電池充電器MAX8601內置所謂的VBATT可控電壓源，它可以在+25°C提供4.2V±0.021V，或在40°C

　　圖(tu)5.MAX8601鋰離子電池單機充電器(qi)的(de)典型(xing)應用電圖(tu)

　　MAX8601充(chong)電(dian)(dian)(dian)(dian)器(qi)的(de)主(zhu)要優點是可(ke)以(yi)通過外部適(shi)配器(qi)或(huo)USB端(duan)口給電(dian)(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)(dian)(圖6)。USB端(duan)口根據(ju)USEL引腳的(de)設置可(ke)以(yi)提(ti)供100mA、500mA電(dian)(dian)(dian)(dian)流(典型(xing)USB輸出電(dian)(dian)(dian)(dian)流)。該芯(xin)片會自動選擇外部電(dian)(dian)(dian)(dian)源(yuan)(yuan)(主(zhu)適(shi)配器(qi)或(huo)USB)。如果兩個電(dian)(dian)(dian)(dian)源(yuan)(yuan)同時存在，它會選擇主(zhu)適(shi)配器(qi)進行(xing)充(chong)電(dian)(dian)(dian)(dian)。任何一個電(dian)(dian)(dian)(dian)源(yuan)(yuan)都(dou)必須能夠提(ti)供最(zui)小4.5V的(de)電(dian)(dian)(dian)(dian)壓。通過USB端(duan)口充(chong)電(dian)(dian)(dian)(dian)可(ke)以(yi)降低外部電(dian)(dian)(dian)(dian)源(yuan)(yuan)模(mo)塊(kuai)(kuai)的(de)成本，電(dian)(dian)(dian)(dian)源(yuan)(yuan)模(mo)塊(kuai)(kuai)通常體(ti)積較大且(qie)效率較低。

　　MAX8601具有(you)低電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)預充(chong)(chong)、限(xian)壓(ya)/限(xian)流快速充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)和(he)浮充(chong)(chong)模式等控制算法，優化了鋰(li)離(li)子電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)。器(qi)件(jian)還有(you)上(shang)電(dian)(dian)(dian)(dian)(dian)(dian)復位以及電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)過壓(ya)、高(gao)溫(wen)/低溫(wen)檢測和(he)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)時(shi)(shi)間(jian)的(de)連續(xu)監測功能。充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)過程中出現(xian)過壓(ya)、高(gao)溫(wen)或低溫(wen)會造成(cheng)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)的(de)永久損壞，降低電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)容量和(he)使用時(shi)(shi)間(jian)，甚至使電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)報廢。最壞的(de)情(qing)況下，會造成(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)泄漏或爆炸。MAX8601確(que)保充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)過程中不會出現(xian)上(shang)述危害，從而(er)延長了電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)使用時(shi)(shi)間(jian)，消除(chu)了潛在的(de)情(qing)況。

　　圖6.圖5中(zhong)充電器的充電流(liu)程圖

　　結論DS2711/DS2712和MAX8601都是單機充電(dian)器，它們具有多種功能(電(dian)壓、功率、溫(wen)度、計時等)，既不需(xu)要微控制器，也不需(xu)要電(dian)源浪涌，而且提供清(qing)晰、簡單的外部切換。

　　常見問題及解答

　　什(shen)么場合不適合使(shi)用(yong)可再充(chong)電(dian)電(dian)池(chi)？

　　答：不要在諸如遙控和煙霧報警等應用(yong)中使(shi)用(yong)充電電池(chi)(chi)。因為這些應用(yong)的(de)電源要求比(bi)較(jiao)低(di)，而(er)且(qie)設備不經常(chang)使(shi)用(yong)。可再充電電池(chi)(chi)比(bi)普通電池(chi)(chi)具(ju)有更高的(de)自放電率。譬如，鎳氫電池(chi)(chi)每天損失1%的(de)電量。因而(er)它的(de)工作時間不太長。

　　能否(fou)給一次性電池(如(ru)堿性電池)充電？

　　答：不能(neng)給堿性(xing)電池充(chong)電。堿性(xing)電池的(de)化學(xue)成分(fen)及構造不適合進行充(chong)電，入的(de)能(neng)量會(hui)發(fa)熱，隨著內(nei)部溫度的(de)上升，電池通常會(hui)出現泄漏現象，有時可能(neng)會(hui)爆炸。電池內(nei)部的(de)有毒物質對(dui)的(de)影響很大(da)。

　　為(wei)什么(me)監測(ce)充電電池的溫度十分重要？

　　答：盡管充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)池(chi)的化學成分及(ji)(ji)構(gou)造適合(he)進行充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)，但對電(dian)(dian)(dian)(dian)池(chi)允許的電(dian)(dian)(dian)(dian)量及(ji)(ji)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)速(su)率有所(suo)。短時間內充(chong)(chong)(chong)入過(guo)多電(dian)(dian)(dian)(dian)量會(hui)使內部(bu)溫(wen)度(du)(du)升高，同堿(jian)性電(dian)(dian)(dian)(dian)池(chi)一(yi)樣(yang)(yang)，可(ke)能(neng)造成電(dian)(dian)(dian)(dian)池(chi)泄漏甚至(zhi)爆(bao)炸。一(yi)旦充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)(chong)滿電(dian)(dian)(dian)(dian)，額(e)外的電(dian)(dian)(dian)(dian)荷會(hui)使電(dian)(dian)(dian)(dian)池(chi)發(fa)熱。如果不對溫(wen)度(du)(du)進行監(jian)(jian)測(ce)，并(bing)降(jiang)低充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)速(su)率或停止充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)，可(ke)能(neng)會(hui)對產生同樣(yang)(yang)的危害(hai)。這就是DS2711/DS2712/MAX8601在充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)過(guo)程中監(jian)(jian)測(ce)諸多參數(shu)的原(yuan)因所(suo)在，這樣(yang)(yang)將確保較長(chang)的電(dian)(dian)(dian)(dian)池(chi)使用時間以及(ji)(ji)安全的充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)過(guo)程。