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充電機如何控制過充?

2019/3/12 9:04:12??????點擊:
  當蓄電(dian)(dian)池(chi)(chi)充滿(man)電(dian)(dian)以后,充電(dian)(dian)機需要(yao)適(shi)時地堵截充電(dian)(dian)電(dian)(dian)流,否則蓄電(dian)(dian)池(chi)(chi)將出現大量出氣、失水和溫升(sheng)等過充的(de)反應,這將危及到蓄電(dian)(dian)池(chi)(chi)的(de)使(shi)用(yong)壽命(ming)。因(yin)此,隨時監測蓄電(dian)(dian)池(chi)(chi)的(de)充電(dian)(dian)情況是(shi)非常(chang)有(you)必(bi)要(yao)的(de),確保電(dian)(dian)池(chi)(chi)能夠把電(dian)(dian)充足并且又不過充電(dian)(dian)。主要(yao)的(de)停充操控(kong)辦法有(you):
  第一(yi)、定時(shi)控制選用恒流(liu)充(chong)(chong)電(dian)(dian)法時(shi),電(dian)(dian)池(chi)所需充(chong)(chong)電(dian)(dian)時(shi)間可依(yi)據電(dian)(dian)池(chi)容量(liang)和(he)充(chong)(chong)電(dian)(dian)電(dian)(dian)流(liu)的(de)(de)大小很容易地確定,因此只需預先設定好充(chong)(chong)電(dian)(dian)時(shi)間,一(yi)旦時(shi)間一(yi)到,守時(shi)器(qi)即可發布信號(hao)停充(chong)(chong)或(huo)降為涓流(liu)充(chong)(chong)電(dian)(dian)。定時(shi)器(qi)可由(you)時(shi)間繼電(dian)(dian)器(qi)充(chong)(chong)當,或(huo)許由(you)單(dan)片(pian)機承(cheng)當其(qi)功用。這種辦法簡單(dan),但充(chong)(chong)電(dian)(dian)時(shi)間不能(neng)依(yi)據電(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)前狀況而自動調整,因此實際充(chong)(chong)電(dian)(dian)時(shi),可能(neng)會出現有時(shi)欠(qian)充(chong)(chong)、有時(shi)過充(chong)(chong)的(de)(de)表象;
  第(di)二(er)、電池溫(wen)(wen)(wen)(wen)(wen)度(du)操控對Ni-cd電池而言,正常(chang)充電時(shi)(shi),蓄電池的溫(wen)(wen)(wen)(wen)(wen)度(du)改(gai)變并(bing)不(bu)顯(xian)著(zhu),可是,當(dang)電池過充時(shi)(shi),其(qi)內部氣體壓力(li)將(jiang)快速增大,負極板上(shang)氧化反(fan)響(xiang)使內部發熱,溫(wen)(wen)(wen)(wen)(wen)度(du)快速上(shang)升(每分鐘可升高幾個攝氏度(du))。因此,調查電池溫(wen)(wen)(wen)(wen)(wen)度(du)的改(gai)變,即可判別電池是否現已(yi)充溢(yi)。通常(chang)選用兩只熱敏(min)電阻(zu)別離檢測(ce)電池溫(wen)(wen)(wen)(wen)(wen)度(du)和環境溫(wen)(wen)(wen)(wen)(wen)度(du),當(dang)兩者(zhe)溫(wen)(wen)(wen)(wen)(wen)差(cha)到(dao)達一定(ding)值時(shi)(shi),即宣(xuan)布(bu)停充信號(hao)。因為熱敏(min)電阻(zu)動態響(xiang)應速度(du)較慢,故不(bu)能及時(shi)(shi)精確地(di)檢測(ce)到(dao)電池的滿充狀(zhuang)況(kuang);
  第三、電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)端電(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)負增(zeng)量一(yi)(yi)般(ban)而言,當電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)充(chong)(chong)足電(dian)(dian)(dian)后,其端電(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)將呈(cheng)現(xian)降低趨勢,據此(ci)可(ke)將電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)電(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)出現(xian)負增(zeng)長的(de)時(shi)間(jian)作為停充(chong)(chong)時(shi)間(jian)。與溫度操(cao)控法比較(jiao),這(zhe)種辦法呼(hu)應速度快,此(ci)外,電(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)的(de)負增(zeng)量與電(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)的(de)絕對值無關,因此(ci)這(zhe)種停充(chong)(chong)操(cao)控辦法可(ke)適應具(ju)有不(bu)一(yi)(yi)樣單格電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)數的(de)蓄(xu)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)組充(chong)(chong)電(dian)(dian)(dian)。此(ci)辦法的(de)缺陷是一(yi)(yi)般(ban)的(de)檢測器靈敏度和可(ke)靠性不(bu)高(gao),同時(shi),當環境溫度較(jiao)高(gao)時(shi),電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)足夠電(dian)(dian)(dian)后電(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)的(de)減小并不(bu)顯著,因此(ci)難以操(cao)控;
  第四、使用極化電壓操控通常情況下,蓄電池的極化電壓出現在電池剛好充滿后,通常在50mV~100mV數量級,選用有關專利技術來測量每個單格電池的極化電壓,這樣就使每個電池都可充電到它自身所需求的程度。研討表明,因為每個電池在幾何結構、化學性質及電學特性等方面至少存在一些細微的不同,那么依據每個單格電池的特性來斷定它所需求的充電水平會比把蓄電池組作為一個整體來操控的辦法更加適宜一些。上海施能電器(qi)設備有限公司始建于1984年(nian),上海市高新技術企業,中國工業車輛優秀配套供應商,上海電器行業名優產品,主要生產工頻系列充電機,高頻系列充電機,鋰電池充電機,系列放電機,系列充放電機等電器產品。
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