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            蓄電池充電方式分析

              1 引言


              隨著電池應用領域的拓展,它與我們的生活更密切。所以要想更好的、合理的用好市場上種類繁多的電池,就需要我們去了解不同種類電池之間的不同特點及特性,辨別它們之間自身的差異,這樣才能提升使用電池的能力。可是,僅了解電池的特性后,不能就說可以用好電池。因為研究發現:電池充電過程對電池壽命影響最大,放電過程的影響較少。也就是說,絕大多數的蓄電池不是用壞的,而是“充壞”的。所以,懂得電池不同特性還不夠,還要我們去了解更多的有關電池的充電知識。不同的電池,在電量不足的時候,如何通過正確地、科學的充電去靈活維護好電池性能,這樣才能更科學的用好電池,使電池用得持久、用得安全、用的放心,才能避免資源的浪費、成本的增加,還能保護我們的環境資源的消耗。


              所以,了解電池自身的構造原理、特性,熟悉電池的不同充電方式,是靈活用好電池的基礎,是在使用電池前所必需去學習、了解的知識。


              2 電池種類


              2.1鉛酸蓄電池


              鉛酸蓄電池是一種老式電池,成本最低,適用溫度范圍廣,可再充電使用,電壓平臺穩定,電池的單體開路電壓為2V,通常都串聯成電池組使用。是應用最廣泛的二次電池,如:汽車等車輛啟動,通訊、電力系統的備用電池,太陽能、風能儲能電池,電動汽車電池。小型電池用于應急照明、野外系統。廢舊電池可以回收利用,原材料可循環使用。廢舊電池如妥善回收、處理,不會對環境產生危害。它可以提供大電流的放電,但壽命比其它電池都短、且重量大。


              2.2鎳鎘電池


              這種電池是早期開發的可充電池,可靠性高,循環壽命好,容量小體積大,成本較高,記憶效應嚴重,使用中常會因為記憶效應出現容量嚴重下降的假性損壞。充電最高電壓為1.75V-1.8V,最低放電電壓為1.0V。主要應用于電動工具等。由于鎘金屬劇毒,對環境、生產工人的身體產生嚴重危害,該系列電池已基本禁用。


              2.3鎳氫電池


              鎳氫電池是在鎳鎘電池基礎上開發的環保綠色產品,其特點是容量比鎳鎘電池大,循環壽命長(理論壽命為1000次左右),記憶效應很小,放電平穩。基本應用于電動工具等,近年來在混合動力汽車上使用。缺點是成本高,低溫性能差,如冬季在室外使用則容量大大降低,限制了應用范圍。對放電和充電要求嚴格,過充和過放都會嚴重損壞電池,最高充電電壓限制在1.0V。充電前期采用大電流恒流充電,后期采用小電流恒壓充電,特別是充電的后期,如果采用大電流充電,電池就會嚴重發熱,發熱嚴重的電池還可能發生爆炸。


              2.4鋰電池


              鋰電池的優點是容量大,體積和重量小,單體電壓高(單體電壓為3.6V),放電平穩,沒有記憶效應,循環壽命約為500次左右,綠色環保,是二次電池中的高端產品。廣泛使用于移動電話、數碼產品、筆記本電腦、航模等。其缺點是造價高、對充電和放電要求特別嚴格,過充電和過放電都會嚴重損壞電池,特別是過充會造成電池爆炸,所以所有鋰電池都無一例外的有充放電保護電路。
            單體鋰電池的充電最高電壓限制在4.2V,最低放電電壓限制在2.5V,為了進行快速充電,充電前期采用大電流恒流充電,后期采用小電流恒流充電。


              3充電方式


              3.1常規充電法


              常規充電制是依據1940年前國際公認的經驗法則設計的。其中最著名的就是“安培小時規則”:充電電流A數,不應超過蓄電池待充電的Ah數。實際上,常規充電的速度被蓄電池在充電過程中的溫升和氣體的產生所限制。這個現象對蓄電池充電所必須的最短時間具有重要意義。首先,它可以指導我們開展電池檢測工作;其次,它讓我們更加關注測試中出現的現象,對電池的性能有更進一步認識,為今后工作添加新的方式和方法。


              一般來說,常規充電有以下3種方法。


              3.1.1恒流充電法


              恒流充電法,是用調整充電裝置輸出電壓或改變與蓄電池串聯電阻的方法,保持充電電流強度不變的充電方法。控制方法簡單,但由于電池的可接受電流能力隨著充電過程的進行而逐漸下降,到充電后期,充電電流多用于電解水,產生氣體,使出氣過量及溫度過高,最好不要單獨采取這種恒流充電方法充電,常選用階段充電法。


              3.1.2階段充電法


              此方法包括二階段充電法和三階段充電法。


              ① 二階段充電法,是采用恒電流、恒電壓相結合的快速充電方法。首先,以恒電流充電至預定的電壓值;然后,改為恒電壓完成剩余的電池容量的充電。一般兩階段之間的轉換電壓就是第二階段的恒電壓。采取二階段充電方法充電可基本使電池達到充電要求。


              ② 三階段充電法,是在充電開始和結束時采用恒電流充電,中間用恒電壓充電。當電流衰減到預定值時,由第二階段轉換到第三階段。這種方法可以將出氣量減到最少,但作為一種快速充電方法使用,受到一定的限制。


              本公司對鉛酸電池采用智能三階段充電,開始采取恒流充電,中間采取恒壓充電,到后期電流衰減到一定值后,轉為浮充狀態避免對電池造成過充。


              3.1.3恒壓充電法


              充電電源的電壓在全部充電時間里保持恒定的數值,隨著蓄電池端電壓的逐漸升高,電流逐漸減少。與恒流充電法相比,其充電過程更接近于最佳充電曲線。用恒定電壓快速充電,由于充電初期蓄電池電動勢較低,充電電流很大,隨著充電的進行,電流將逐漸減少,因此,只需簡易控制系統。


              這種充電方法電解水很少,避免了蓄電池過充。但在充電初期電流過大,對蓄電池壽命造成很大影響,且容易使蓄電池極板彎曲,造成電池報廢。


              鑒于這種缺點,對電池單獨采取恒壓充電的很少使用,只有在充電電源電壓低而電流大時采用。例如,汽車運行過程中,蓄電池就是以恒壓充電法充電的。


              3.2快速充電技術


              為了能夠最大限度地加快蓄電池的化學反應速度,縮短蓄電池達到滿充狀態的時間,提高工作效率,同時,保證蓄電池正負極板的極化現象盡量少或輕,降低對電池的損耗,提高蓄電池使用效率。近年來快速充電技術得到了迅速發展。


              下面介紹目前比較流行的幾種快速充電方法。這些方法都是圍繞著最佳充電曲線進行設計的,目的就是使其充電曲線盡可能地逼進最佳充電曲線。


              3.2.1脈沖式充電法


              這種充電法不僅遵循蓄電池固有的充電接受率,而且能夠提高蓄電池充電接受率,從而打破了蓄電池指數充電接受曲線的限制,這也是蓄電池充電理論的新發展。

              脈沖充電方法,首先是用脈沖電流對電池充電,然后讓電池停充一段時間,如此循環。充電脈沖使蓄電池充滿電量,而間歇期使蓄電池經化學反應產生的氧氣和氫氣重新化合而被吸收,使濃差極化和歐姆極化自然而然地得到消除,從而減輕了蓄電池的內壓,使下一輪的恒流充電能夠更加順利地進行,使蓄電池可以吸收更多的電量。間歇脈沖使蓄電池有較充分的反應時間,減少了析氣量,提高了蓄電池的充電電流接受率。


              3.2.2 REFLEXTM快速充電法


              這種技術是美國的一項專利技術,它主要面對的充電對象是鎳鎘電池。由于它采用了新型的充電方法,解決了鎳鎘電池的記憶效應,因此,大大降低了蓄電池的快速充電的時間。鉛酸蓄電池的充電方法和充電狀態的檢測方法與鎳鎘電池有很大的不同,但它們之間可以相互借鑒。
            REFLEXTM充電法的一個工作周期,包括正向充電脈沖、反向瞬間放電脈沖、停充維持等3個階段。

              3.2.3變電流間歇充電法


              這種充電方法建立在恒流充電和脈沖充電的基礎上。其特點,是將恒流充電段改為限壓變電流間歇充電段。充電前期的各段采用變電流間歇充電的方法,保證加大充電電流,獲得絕大部分充電量。充電后期采用定電壓充電段,獲得過充電量,將電池恢復至完全充電狀態。通過間歇停充,使蓄電池經化學反應產生的氧氣和氫氣有時間重新化合而被吸收掉,使濃差極化和歐姆極化自然而然地得到消除,從而減輕了蓄電池的內壓,使下一輪的恒流充電能夠更加順利地進行,使蓄電池可以吸收更多的電量。


              3.2.4變電壓間歇充電法


              在變電流間歇充電法的基礎上,又有人提出了變電壓間歇充電法。與變電流間歇充電方法不同之處,在于第一階段的不是間歇恒流,而是間歇恒壓。


              間歇電壓更加符合最佳充電的充電曲線。在每個恒電壓充電階段,由于是恒壓充電,充電電流自然按照指數規律下降,符合電池電流可接受率隨著充電的進行逐漸下降的特點。

              3.2.5變電壓變電流波浪式間歇正負零脈沖快速充電法


              綜合脈沖充電法、REFLEXTM快速充電法、變電流間歇充電法及變電壓間歇充電法的優點,變電壓變電流波浪式正負零脈沖間歇快速充電法得到發展應用。脈沖充電法充電電路的控制一般有兩種:


              ① 脈沖電流的幅值可變,而PWM(驅動充放電開關管)信號的頻率是固定的;

              ② 脈沖電流幅值固定不變,PWM信號的頻率可調。

              用了一種不同于這兩者的控制模式,脈沖電流幅值和PWM信號的頻率均固定,PWM占空比可調,在此基礎上加入間歇停充階段,能夠在較短的時間內充進更多的電量,提高蓄電池的充電接受能力,減少了對電池的損傷等優點。


              4電池使用注意事項


              ⑴ 仔細閱讀電池說明書,使用所推薦的電池,按操作規程操作。

              ⑵ 不要將新、舊電池或不同型號電池混用,特別是不能將干電池與可充電電池混用。

              ⑶ 不要將充電電池短路,否則會損壞電池,并會發熱使電池燃燒。

              ⑷ 不要加熱電池或將電池丟入水中或火中。將電池放入水中會使電池失效,將電池放入火中會使電池破裂、或發生激烈的化學反應爆裂傷人、或產生一些有害的氣體和煙塵等。

              ⑸ 不要拆卸電池、或試圖用尖銳利器穿透電池,因電池內部電解液會傷害皮膚和衣物。

              ⑹ 電池應保存在陰涼、干燥處,避免陽光直射。

              ⑺ 鎳充電器與鋰充電器不能混用。

              ⑻ 不能將電池焊接使用。焊接時產生的高溫會損壞電池的內部結構,可能會使電池不能使用,甚至出現危險。


              ⑼ 不能反向充電。反向充電等同于過放電,過放電會使電池內部發生不良反應并導致電池的嚴重損壞,生成大量氣體,很可能會使充電電池發生化學泄漏。

              ⑽ 不能將充電電池放在雨水下。雨水能導電,電池放在雨水下時,很可能會發生短路,使電池因瞬間大電流放電而發燙,會損壞電池或發生危險。

              ⑾ 不能將電池貯存在高溫或高濕的環境下,電池本身的反應會加劇,故無法向用電器提供足夠的容量。另外,高溫高濕下,電池的老化速度也會大大加快,也會腐蝕電子元器件 (高溫電池除外)。

              ⑿ 不要將電池正負極插反,否則會導致電池鼓脹或破裂。

              5 結束語

              通過上面對常用蓄電池、蓄電池充電方法及充電注意事項的介紹,對蓄電池本身的特點、特性的要求,以及蓄電池充電方法的過程有進一步認識,對于如何合理、科學的將蓄電池及蓄電池充電方法搭配好使用有更好地了解。讓蓄電池的性能得到更加高效、科學的應用,讓電池的維護更加到位,為蓄電池的使用而讓我們的生活變得更加美好。


              廣州光橋是專業的電源生產廠家,多年研發,生產,銷售通信電源,通信電源系統,逆變電源經驗,公司通過ISO9001認證,質量保證,價格優惠.如想進一步了解產品參數,請登錄www.www.zhongzebengye.com進行瀏覽,或致電免費熱線電話:400-800-6032

             




              更新時間:2015-01-06  【打印此頁】  【關閉

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