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铅酸蓄电池深度放电对电池的影响

铅酸蓄电池放电深度（DOD ）放电深度是指电池在使用过程中放电至什么程度，通常是以放出的容量与电池本身容量之比来衡量，以百分比表示。如放电深度2 。％，即放出的容量是电池额定容量的20 % ，这样的放电深度属于“浅放电”；又如放电深度90 % ，即放出容量是电池本身容量的90 % ，这样的放电深度属于“深放电”。放电完后，接着给电池充电，放电越深，充电越困难，对电池的损坏就越严重。充电困难在于能否将电池充起来（放电后的能力恢复）。电池频繁的深放电，电池寿命就会很短。因此电池以循环使用方式应用时，其寿命取决于放电深度与放电频率（次数）。其电池损坏的机理是：电池正极活性物质的PbO₂ : ．本身与极板的板栅结合力较差，PbO₂粒子与粒子之间接触（结合）也不太紧密，放电时PbO₂-PbS0₄ ，充电时PbS0₄ -PbO₂ : ，而PbS0₄ 是PbO₂的摩尔体积达1 . 94 倍，因而放电过程正极活性物质的体积是增大的，即发生了膨胀，这样在充／放电交替进行时，正极活性物质就反复地膨胀与收缩，PbO₂粒子之间彼此结合变差，彼此的接触不好，就发生松弛，活性物质就会从板栅上脱落，随着放电深度越深，活性物质的收缩膨胀的程度就越大，结合力与接触状态的破坏程度就越大，就越来越逼近电池寿命终点。

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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