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首页> 外文期刊>Journal of power sources >Failure mechanism of valve-regulated lead-acid batteries under high-power cycling
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Failure mechanism of valve-regulated lead-acid batteries under high-power cycling

机译：大功率循环下阀控式铅酸蓄电池的失效机理

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摘要

A group of valve-regulated lead-acid (VRLA) batteries (12 V, 33 Ah) cycled under high power has exhibited premature failure. The only difference between failed and healthy batteries is the shedding of active material from the positive plates. The dislodged material has been examined by means of X-ray diffraction, scanning electron microscopy, and cyclic voltammetry. It is found that the material has a β-PbO_2 structure. The particles, which are oval in shape with a diameter of about 100 μm, are uniform and well separated from each other. The activity of the material can be restored under pressure. It is concluded that the failure mode of VRLA batteries under high-power cycling is softening of the positive active-material, which eventually results in deterioration of the electrical conductivity and de-activation of the material.
机译：一组在高功率下循环的阀控式铅酸（VRLA）电池（12 V，33 Ah）过早失效。失效电池和正常电池之间的唯一区别是正极板上的活性物质脱落。已经通过X射线衍射，扫描电子显微镜和循环伏安法检查了脱落的材料。发现该材料具有β-PbO_2结构。直径为约100μm的呈椭圆形的颗粒是均匀的并且彼此良好分离。材料的活性可以在压力下恢复。结论是，VRLA电池在大功率循环下的失效模式是正极活性物质的软化，最终导致导电性下降和材料失活。

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