Electric repair small knowledge: analysis of battery deformation failure

The battery deformation is not burst. It is often a process, and the battery enters the high voltage charging area around 80% of the charge to the capacity. At this time, the oxygen is precipitated in the positive electrode plate, and the oxygen is passed through the hole in the partition, reaches the negative electrode, and performs oxygen resurrection on the negative electrode plate: 2pb + o2 = 2Pbo + heat PBO + H2SO4 = PBSO4 + H2O + heat When the reaction is generated, when the charging capacity reaches 90%, the rate of oxygen is increased, and hydrogen is generated by the negative electrode. The increase in a large amount of gas makes the battery internal pressure exceeding the valve pressure, the safety valve is opened, the gas escapes, and finally manifested as lost water. 2H2O = 2H2 ↑ + 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 heat storage is the largest in the battery. After the water loss, the battery heat capacity is greatly reduced, and the heat generated makes the battery temperature rise very quickly. (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, the internal resistance increases, and the heat generation during the charge and discharge is increased. After the above process, the heat generated inside the battery can only be dissipated by the battery trough, such as less heat dissipation, that is, the temperature rise is present. The temperature rises, the precipitation of the battery is lowered, the quantity is increased, and the positive electrode has passed "channel", and a large amount of heat is reacted, and the temperature is rapidly rising, forming a vicious circle, the so-called "thermal out of control." ", The final temperature reaches 80oC or more, that is, deformation." FQJ, read full text

Our other product:

Professional lightning protection system for Tower	Professional FM Radio Station Equipment Package	FMUSER FU-1000C 1000W FM Transmitter With USB Audio Input Interface
FMUSER 200W FM Radio Broadcasting Package	Hotel IPTV Solution	FMUSER FSN-1000T V5.0 1KW FM Radio Broadcast Transmitter