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鉛酸蓄電池深度放電對電池的影響 |
| 鉛酸蓄電池放電深度（DOD ）放電深度是指電池在使用過程中放電至什么程度，通常是以放出的容量與電池本身容量之比來衡量，以百分比表示。如放電深度2 。％，即放出的容量是電池額定容量的20 % ，這樣的放電深度屬于“淺放電”；又如放電深度90 % ，即放出容量是電池本身容量的90 % ，這樣的放電深度屬于“深放電”。放電完后，接著給電池充電，放電越深，充電越困難，對電池的損壞就越嚴重。充電困難在于能否將電池充起來（放電后的能力恢復(fù)）。電池頻繁的深放電，電池壽命就會很短。因此電池以循環(huán)使用方式應(yīng)用時，其壽命取決于放電深度與放電頻率（次數(shù)）。其電池損壞的機理是：電池正極活性物質(zhì)的PbO2 : ．本身與極板的板柵結(jié)合力較差，PbO2粒子與粒子之間接觸（結(jié)合）也不太緊密，放電時PbO2-PbS04 ，充電時PbS04 -PbO2 : ，而PbS04 是PbO2的摩爾體積達1 . 94 倍，因而放電過程正極活性物質(zhì)的體積是增大的，即發(fā)生了膨脹，這樣在充／放電交替進行時，正極活性物質(zhì)就反復(fù)地膨脹與收縮，PbO2粒子之間彼此結(jié)合變差，彼此的接觸不好，就發(fā)生松弛，活性物質(zhì)就會從板柵上脫落，隨著放電深度越深，活性物質(zhì)的收縮膨脹的程度就越大，結(jié)合力與接觸狀態(tài)的破壞程度就越大，就越來越逼近電池壽命終點。 Turn on electricity depth(DOD) to turn on electricity depth to mean that the battery is in the process of using in turns on electricity into what extent, usually with let out of the ratio of capacity and battery capacity to measure, mean by percentage.If turn on electricity depth 2.%, Then the capacity letting out is a battery sum to settle 20% of capacity, so of turn on electricity depth to belong to "is shallow to turn on electricity";Again if turn on electricity depth 90%, then letting out the capacity is 90% of battery capacity, so of turn on electricity depth to belong to "deeply turn on electricity".After finishing turning on electricity, immediately after refresh for battery, turn on electricity more deep, refresh more difficult, to the damage of battery more serious.Refreshing a difficulty to lie in can get up(ability instauration after turning on electricity) battery Chong.The battery multifariously and deeply turns on electricity, the battery life will be very short.Therefore when the battery uses a way application by circulation its life span is decided by to turn on electricity depth with turn on electricity frequency(number of times).The mechanism that its battery damages is:The PbO2 of the battery cathode activity material:.Oneself combine dint with the pole knothole plank grid worse, PbO2 grain son and grain son of indirectly touch(combine) also not that close, while turning on electricity PbO2-PbS04, while refreshing PbS04-PbO2:, But the PbS04 is the physical volume of Mo Er of PbO2 to reach to 1.9400%, as a result the physical volume that turns on electricity the process cathode activity material is an aggrandizement of, then took place to inflate, so in the Chong/turn on electricity alternately carry on, cathode live material again and again inflation and constringency, of PbO2 grain son each other combines and becomes bad, each other of the contact isn't good, take place flabby, the live material will shed off from the plank grid, along with turn on electricity depth more deep, the constringency of activity material inflates of the degree is more big, combine the breakage degree of dint and contact status more big, more and more approach battery life terminal point. |
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