Author ：Iflowpower – Portable Power Station Supplier
I. Safety valve pressure over high valve controlled lead-acid battery is provided with a row of safety valves in order to ensure safe use, when the pressure in the battery rises, the safety valve will automatically open, to ensure the internal and external air pressure balance inside and outside the battery. When the pressure is rising in the battery, the safety valve cannot be opened normally.
For a long time, since the pressure in the battery is too high, the internal and external gas pressure is unbalanced, there will be a phenomenon of drums. Second. Over-filled storage battery engineers repeatedly stressed that the battery should prevent overcharge and over-discharge, and the overcharge will lead to poor gas composites in the battery.
There is a severe reaction of the battery in the battery, which has a large amount of heat, which leads to electrolytes. Decompose gasification, the battery is drumping. III.
The charging current is too large. According to the battery instructions, the battery BT-HSE12V battery charging current cannot exceed 0.25C, and the recommended recommendations are 0.
1c (10a), while charging current is greater than this reasonable current value, it is easy Leading the precipitation of the electrode plate too fast, which in turn leads to insufficient chemical reactions. At this time, the temperature inside the battery will rise rapidly. If the exhaust is not in time, there will be a phenomenon of battery drums.
IV. The floating charge is set too high, and the charging current is large, causing the o2 in the positive plate to accelerate, and it is not as good as the negative composite, and the temperature rise in the battery is also very fast, in the exhaust When the pressure reaches a press, the VRLA battery is deformable. The reason for electric vehicle lithium-ion battery drums: 1, the quality of charger is low, the price war is killed, the charger quality is declining, using inferior plate, refurbishment or low inferior device, fever, parameter drift is not accurate, so that the charging limit is out of control, The internal gas extrusion of lithium ion battery pack results in a deformation of the battery shell and even explosion.
2, the charging time is too long, some users don't have time concept, thinking that inserting a charging full automatic stop, I don't ask, some even fill two days and two nights, I used it for a long time, electric car lithium ion The battery pack life will be threatened. If over charge can result in a large amount of gas flush electrode plate, it causes the internal active substance to fall off, shorten battery life, so that the battery is in vainable, affecting the decomposition of the electrolyte, so that the battery temperature increases, make it Drug! The valve hole is blocked, enhances the internal gas pressure causes the battery case to deformed, and the split is swollen. 4, forget the charger with charger, just borrow one, or a family of several electric car size chargers, this is very common, each electric car battery brand has its own interface, current value, different electric The car may have different charging voltages, the charging current is different, the natural charging time and charging efficiency are different, and the charger, the battery is large, the charger is small, the charge is low, the battery is small, the charger is large, the charging, the heat is out of control, will be drumming.
The above is the cause analysis of lithium-ion batteries, batteries, electric vehicle battery drums. Safety problems of the iron phosphate battery pack have been the topic of people's continued attention, although lithium-ion battery technology is constantly improving, but safety hazards still exist. The safety performance of the battery has no better lithium-ion battery pack.
If there is a phenomenon of drum bag during use in the use of lithium-ion battery packs, small-series is recommended to replace the battery, after all, the most important. 1. The charging process takes out the lithium ion from the positive electrode lattice under the driving process, and is embedded in the negative electrode lattice.
The voltage is lower than 3V, first perform precharge, the charging current is 1/10 of the set current, and the voltage rises to 3V, enter the standard charging process. The standard charging process is: When the current is constant, the battery voltage rises to 4.20V, change to constant pressure charging, keep the charging voltage of 4.
20V. At this time, the charging current gradually decreases, and when the current drops to 1/10 of the set charging current, charging ends. This is a process of a general lithium-ion battery charge, if the lithium ion battery exists in a smart device, its charging mode will be controlled by intelligent device software.
2. Battery discharge, at this time, the electronic E on the negative electrode is ran from the positive electrode through the external circuit. Come together.
By understanding the charge and discharge process of lithium-ion batteries, we can understand from microscopic, the capacity of the battery is actually the amount of charge containing the battery. The larger the current, the faster the discharge speed, the shorter the battery used. Why is the battery that the battery does not use the drum in normal use or long time? There are two phenomena in the process of charge and discharge: one.
Excessive charging caused by overcharge can result in all the lithium atoms in the positive electrode material to the negative electrode material, resulting in a transition of the positive absorbed grid, which is also an important reason for the decline in lithium-ion battery. During this process, the lithium ions of the negative electrode are increasing, and the over-accumulation allows the lithium atom to be crystallized, so that the battery is bulging. two.
In the first charge and discharge process of the liquid lithium ion battery, the electrode material is reacted on the solid-liquid phase interface in the liquid lithium ion battery, forming a passivation layer covering the surface of the electrode material. The formed passivation layer film can effectively prevent the passage of the electrolyte molecule, but Li + can be freely embedded and disengaged by the passivation layer, and has the characteristics of the solid electrolyte, so this layer of passivation film is referred to as a solid electrolyte interface mask. (SolideElectrolyteinterface), referred to as SEI.
The SEI film will protect the negative electrode material, so that the material structure is not easy to collapse, and the cycle life of the electrode material can be added. The SEI film is not a constant, there will be a little change during the charge and discharge process, it is important that some organic matter will reversible changes. After the battery is excessively discharged, the SEI film occurs reversible to break the ring, and the SEI destruction of the negative electrode material makes the negative electrode material collapse, thereby forming a bulk phenomenon.
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