The battery deformation is not burst, and it is often a process. The battery enters the high voltage charging zone around 80% of the charge to the capacity. At this time, the oxygen is precipitated in the positive electrode, and the oxygen passes through the holes in the separator to reach the negative electrode. Oxygen resurrection reaction on the negative electrode plate:
2 Pb + 02 = 2PBO + H2O + Q PBO + H2SO4 = PBSO4 + H2O + Q generates heat, when the charging capacity reaches 90%, the rate of oxygen increases, and the negative electrode begins to produce hydrogen. The increase in a large amount of gas is that the battery internal pressure exceeds the valve pressure, the safety valve is opened, the gas escapes, and finally it is vivo.
2H2O = H2 + O2
As the number of battery cycles increases, the moisture gradually decreases. As a result, the battery is as follows:
(1) The oxygen "channel" becomes unblocked, and the oxygen generated by the positive electrode is easy to pass through the "channel".
(2) The heat capacity is reduced, and the maximum heat storage in the battery is water. After the water loss, the battery heat capacity is greatly reduced, and the heat generated is rapidly increased.
(3) Due to the contraction of the ultrafine glass fiber separator in the battery after lossless, it is deteriorated with the adhesion of the positive and negative plate, and the internal resistance is large, and the charge and discharge process is increased. After the above process, the heat generated inside the battery can only be dissipated by the battery trough.
If the heat dissipation is less than the heat generation, the temperature is increased, so that the electric storage gas is lowered, the quantity is increased, and the positive electrode has passed "channel", and a large amount of heat is rapidly increased. Forming a malignant cycle leads to "thermal out of control", deformation.
Fault inspection and processing
A set of batteries (3) simultaneously deformed, first voltage check. If the voltage is substantially normal. It is also possible to measure whether a single voltage determination is shorted, and there is no short circuit, the deformation is caused by "thermal out-of control". The charging parameters of the charger should be focused. The voltage is too high to be lowered or the trickle conversion current is low, and the charger is required to replace the charger.
If the battery deformation drum can continue to use, but it should be noted that the charging time cannot exceed 8 hours. The battery drum indicates that the internal lack of procedure should be added to add 5-10 ml of the supplement, and then charging, filled, filled with electricity A extra free acid can no longer drum more.
After the battery is filling, it is basically necessary to use it. When the battery is full, the battery is saturated, stop charging. If the battery continues to charge, it will be drummed. After the battery is dried, the polar plate inside is deformed. The plate will break. If the battery is collided, the battery cannot be normalized and discharge, so the drum battery is scrapped, only Can replace new batteries.
There are two possibilities of the battery profile drum, one is a long-term overcharge, causing the battery grid deformation, the expansion of the active material; the other is to block the battery exhaust port, and the charge is filled, the gas in the battery is not allowed. The internal increase is increased. This situation is very dangerous, it is very likely to cause explosions.
EDIT: JQ, read full article, original title: What is the reason for the battery deformation drum, can you use it?
Article Source: [Micro Signal: GH_C9C741F44FCF, WeChat public number: Auto Electric Circuit Bottle "] Welcome to add attention! Please indicate the source of the article.
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