電(dian)池組(zu)(zu)SOC即電(dian)池剩余電(dian)量(liang)。傳統燃油(you)車上有油(you)表，還有多少(shao)油(you)，還能跑多遠，看一眼(yan)心里就(jiu)有數了。換做是電(dian)動汽車，駕駛(shi)員則需要了解電(dian)池包還剩下多少(shao)電(dian)量(liang)，電(dian)池組(zu)(zu)SOC是反應電(dian)池包內當前(qian)電(dian)量(liang)占總(zong)體可用容(rong)量(liang)百分(fen)比的一個參數。駕駛(shi)員根(gen)據滿電(dian)狀態總(zong)的里程數，可以推斷(duan)出當前(qian)電(dian)量(liang)的續(xu)航能力(li)，也(ye)有車型直接顯(xian)示續(xu)航距(ju)離。

電(dian)池(chi)組SOC電(dian)量估計不準(zhun)確的(de)電(dian)動汽(qi)車(che)，往(wang)往(wang)給(gei)車(che)主(zhu)帶(dai)來(lai)一些(xie)困擾。如電(dian)量跳(tiao)變，即將停車(che)的(de)時候，掃了(le)(le)一眼電(dian)量，還剩下50%，估計回程(cheng)勉強夠(gou)用(yong)了(le)(le)。過(guo)一會回來(lai)發(fa)動車(che)子，發(fa)現電(dian)量指示在(zai)了(le)(le)40%，貌(mao)似回不去(qu)了(le)(le)。

突(tu)然(ran)掉電(dian)，電(dian)量還有30%的(de)(de)時候，一(yi)腳加(jia)速(su)，驟然(ran)報(bao)警電(dian)量過低，停車(che)了。電(dian)池(chi)組(zu)SOC的(de)(de)準確(que)性，一(yi)直是電(dian)動(dong)(dong)汽車(che)用戶(hu)詬病的(de)(de)重點，在網絡論壇上時常能看到，電(dian)動(dong)(dong)汽車(che)車(che)主(zhu)說又(you)被放到半路的(de)(de)抱怨(yuan)帖。發展多年的(de)(de)電(dian)動(dong)(dong)汽車(che)，電(dian)池(chi)組(zu)SOC的(de)(de)準確(que)估計仍(reng)然(ran)沒有做的(de)(de)特別好。

告知駕(jia)(jia)駛員(yuan)剩余里程(cheng)(cheng)，是電池(chi)組SOC對駕(jia)(jia)駛員(yuan)的(de)價值，同(tong)時，電動汽(qi)車和電池(chi)包的(de)管理控制過程(cheng)(cheng)，也需(xu)要電池(chi)組SOC的(de)準確數據。

電(dian)(dian)(dian)(dian)池組(zu)SOC作(zuo)為(wei)充(chong)(chong)放電(dian)(dian)(dian)(dian)的重(zhong)要閾值，對電(dian)(dian)(dian)(dian)池包起(qi)到調節和保護作(zuo)用。充(chong)(chong)電(dian)(dian)(dian)(dian)過(guo)(guo)程中，如(ru)(ru)果(guo)電(dian)(dian)(dian)(dian)池包電(dian)(dian)(dian)(dian)量過(guo)(guo)低，比(bi)如(ru)(ru)低于10%，則充(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)不能(neng)(neng)馬力全開，而是限(xian)流(liu)充(chong)(chong)電(dian)(dian)(dian)(dian)，直至達到正常(chang)電(dian)(dian)(dian)(dian)量范圍(wei)，方可放開限(xian)制。放電(dian)(dian)(dian)(dian)階段(duan)，當電(dian)(dian)(dian)(dian)量已經(jing)比(bi)較(jiao)低，但仍(reng)然在放電(dian)(dian)(dian)(dian)截止電(dian)(dian)(dian)(dian)量以上，比(bi)如(ru)(ru)低至20%SOC，一般會限(xian)制功(gong)率(lv)輸出，防止大(da)電(dian)(dian)(dian)(dian)流(liu)造成系統觸及停車電(dian)(dian)(dian)(dian)壓(ya)，并且期(qi)望以最節能(neng)(neng)的方式運(yun)行，跑更遠的距離(li)。

電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)組SOC作為(wei)低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)量限(xian)流(liu)(liu)閾(yu)值(zhi)。為(wei)什么電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)包(bao)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)量較(jiao)低(di)(di)(di)的時(shi)(shi)候，需要設置限(xian)流(liu)(liu)策略(lve)？電(dian)(dian)(dian)(dian)(dian)(dian)(dian)量較(jiao)低(di)(di)(di)時(shi)(shi)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)端電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓較(jiao)低(di)(di)(di)，如(ru)果(guo)突然(ran)發生(sheng)大電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)放電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)極化(hua)內阻會迅速增(zeng)大，使得內阻占(zhan)壓上升，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)勢(shi)減去(qu)內阻占(zhan)壓后(hou)的電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)端電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓則(ze)會相(xiang)應降低(di)(di)(di)。如(ru)果(guo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)足夠大，則(ze)端電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓可能被拉低(di)(di)(di)到(dao)停止供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓以下。如(ru)果(guo)低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓持續(xu)(xu)時(shi)(shi)間(jian)超過延時(shi)(shi)時(shi)(shi)間(jian)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)管理系(xi)統判斷(duan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓過低(di)(di)(di)，無法(fa)繼續(xu)(xu)工(gong)作，需要斷(duan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)。于(yu)是主動斷(duan)掉電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)包(bao)主回路(lu)接觸器。突然(ran)的掉電(dian)(dian)(dian)(dian)(dian)(dian)(dian)于(yu)是發生(sheng)了(le)。當然(ran)，有的車型電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源主回路(lu)接觸器的控(kong)制(zhi)權限(xian)在整車控(kong)制(zhi)器上。作為(wei)整車控(kong)制(zhi)策略(lve)閾(yu)值(zhi)

電(dian)(dian)(dian)動汽車上有(you)多(duo)種用(yong)電(dian)(dian)(dian)器，空調，音響，轉向助力，剎(cha)車助力等等。當電(dian)(dian)(dian)池組(zu)SOC降低到一定(ding)程度(du)，用(yong)電(dian)(dian)(dian)器的權限需(xu)要(yao)作出排序，比如(ru)剎(cha)車助力無論什么電(dian)(dian)(dian)量都必須(xu)供電(dian)(dian)(dian)，空調音響，電(dian)(dian)(dian)量少于一定(ding)值時必須(xu)停止供電(dian)(dian)(dian)等等。