Many people are afraid of lithium batteries, but there is nothing they can do about it. Helplessness is because mobile phones, laptops, tablets and other devices need to use it, fear is because do not know which day lithium battery will suddenly do terrorist attacks in front of their own: or combustion, or explosion. Such incidents are naturally related to the electrical characteristics and quality of lithium batteries themselves, but it cannot be ruled out that the correct use of lithium batteries is also one of the causes of lithium battery accidents.
Correct use of lithium battery lithium battery accidents
The method is based on the characteristics of lithium battery itself. Therefore, we first from the electrical analysis of why lithium battery explosion or combustion. Combustion or explosion, usually due to the accumulation of heat that cannot be diffused, accumulates to the point of fire, or accumulates to a certain extent within a certain space, can occur. As a battery, it generally boils down to four reasons why this happens.
1, internal short circuit (mostly soft package large monomer) : structure or process defects lead to pole ear insertion, diaphragm package surplus is too little, burr, diaphragm discount, etc. Very often appears in the thick ear interpolation within the cell and parallel structure, pole ear insulation does not reach the designated position, in the subsequent product plus protection board or use process is easy to cause acute short-circuit and internal combustion or blast (internal short circuit: this man is have deep experience, then scrap more than 2 k the batteries, the actual essence belongs to a design flaw - the anomaly is: Acute internal short-circuiting), but this is rarely the case these days, except for external factors.
2, external short circuit: 1AH below the battery external short circuit caused by combustion explosion is rare, usually bulge or simply burn off the pole ear, personal analysis is the power battery or large capacity mobile phone battery external short circuit caused by combustion. This involves improper use by customers -- the metal outer box is installed without considering the pole ear insulation, and the battery is smoking and burning abnormally on the installation site; Power battery structure fixing measures are also common (thoughtless), in the process of user use battery pack shaking caused damage to the external insulation protective film of the battery or damage to the connecting wire skin, eventually resulting in short circuit combustion.
3, overcharge explosion: this is the most dangerous, but also the most afraid of enterprises, but occasionally. From the understanding of the situation, there are two points: a, users do not use the matching charger according to the requirements, thus damaging the protection line and users are often charged for unlimited time, this situation is not fried; B, the battery configuration is not reasonable and the protection plate failure, in this case, it will explode in a complete mess... Same with a single battery.
4. The material of the battery itself is not up to standard. Material does not pass, may produce overheating in the voltage current demarcated, resulting in accidents.
Based on the above analysis, if the correct use of lithium battery, as far as possible to avoid the occurrence of the above situation, we can comb out some methods:
1, frequent deep charge and discharge: lithium battery has almost no memory, many friends like to use the battery to the last point (protection plate protection) and then charge, and in the eyes of many people, this is also a way to activate the battery. In the use of lithium batteries, we call the situation of using up the charge and then charging deep charge and discharge.
In fact, the depth of charge and discharge is a lot of people in the use of lithium battery when a major misunderstanding, scientists have come to the conclusion through the experiment, the depth of charge and discharge times in other constant environment and battery life is proportional to the case, multiple charge and discharge will lead to the premature end of battery life. The lithium battery with long service life is easy to cause the battery bulge and other conditions, resulting in explosion.
2. Overcharge and discharge flow is large: This is at the time of charging protection board design is not reasonable and often happens, we always like in the device's battery is full of charge again after a while, let your own equipment to fight longer, but many people do not know is that long-term over charge and discharge conditions can have serious injury and damage the performance of lithium batteries, serious can cause extreme cases such as explosion, So the battery should be fully charged, if you keep plugging it into the charger, sooner or later it will lead to tragedy.
3. When charging and discharging, the current of the charger and the general current load of the appliance should be within the specified range. Excessive current load is easy to cause the internal short circuit of the battery, thus destroying lithium ions and causing potential safety hazards of the circuit. The same applies to the voltage of a rechargeable charger. So when we use the charger, we should also pay attention to see whether the charger is qualified.
4. Work environment. Lithium battery is extremely sensitive to temperature. If it is used below freezing point for a long time, it may cause great influence and harm to battery life. If it is placed in an overheated environment for a long time, the battery life will be greatly reduced, and even if the internal pressure increases, the battery will be scrapped quickly in the high heat. It is felt that some cases died due to the pool explosion, most of which was caused by the high temperature of the working environment.
After experiencing many accidents, manufacturers also finally have action, for the current majority of manufacturers have increased the protection device, especially electronic digital products have increased double protection or multiple protection, as far as possible to avoid the occurrence of this situation, however, the strengthening of users' own awareness, is still very important.
