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About the cause of the explosion of lithium battery power tools?

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About the cause of the explosion of lithium battery power tools?

Release date:2017-12-25 Author: Click:

Now everyone's main concern is the burning and explosion of lithium batteries. As far as the lithium battery industry is concerned, the explosion caused by the main cause of the battery itself has already been very low. After all, the factory has passed the test of aging and other tests. Unless it is a very low-grade factory, the products of regular companies will not appear. There is no need to discriminate against the type of batteries. However, the incentives caused by changes in external conditions are major, such as overcharge, overdischarge, external impact, high temperature, etc., so the current prevention approach is to do a good job of line protection design, reasonable structure to prevent these measures. The purpose of the post is to want to tell everyone to choose the lithium battery to be cautious. First of all, you must have a full understanding of the lithium battery you are about to use, and make reasonable use of it.


First, the battery burns and explodes. According to the results of the on-site analysis, the reasons for the batteries involved are as follows:

1, internal short circuit (mostly soft package macromonomer): structure or process defects lead to lug interpolated, less than enough surplus of the diaphragm, burrs, membranes, etc. The lug interpolator often appears in the structure of the thick battery and the internal parallel, the pole ear insulation is not in place, and the subsequent finished product plus the protection board or the use process easily leads to an internal acute short circuit and thus burns or explodes (internal short circuit: this is personal There is a deep understanding, at the time also scrapped more than 2K of this kind of battery, is actually a design flaw - the abnormal nature is: internal acute short circuit), but now this situation is almost no, unless the external factors.



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2, external short circuit: 1AH below the battery after the short-circuit caused by the explosion after combustion is rare, usually bulging or simply to the ear blow, personal analysis of the battery or large-capacity mobile phone battery caused by external short-circuit combustion . This involves the improper use of the customer - when the metal box is installed, the ear insulation is not taken into consideration, and the abnormal burning of the battery occurs at the installation site; the power battery also has insufficient structural fixing measures (inconsiderate) and the user uses the battery pack during the process. Slopping causes damage to the external insulating protective film of the battery or breakage of the connecting wire, eventually resulting in short-circuit combustion.


3, overcharge explosion: This is the most dangerous, but also companies are most afraid of the emergence, but still occasionally appear. From the understanding of the situation, there are two points: a, the user does not use the matching charger as required, thus destroying the protection circuit and the user often charging is not limited when charging, this situation is not fried is difficult; b, the battery matching group Unreasonable and protective plate failure, this situation will also be a mess of fried ... single cell the same way.


4, the above three points are more common, comprehensively: structural design considerations and users to use the specification is to avoid the main direction of product combustion or explosion, I believe that the current major battery manufacturers have made a very reasonable improvement Measures, individuals feel that the development of safer materials is the king of lithium battery safety.


Second, the battery burning, explosion, according to the results of field analysis, involving the use of improper reasons, personal understanding is as follows:


1, frequent deep charge and discharge: lithium battery almost no memory, many friends in the use of lithium tram or lithium battery digital products, like to use the power to the point (protection board protection) and then go to charge, and in many people's eyes , This is also a way to activate the battery. In the use of lithium batteries, we call the charge-recharge condition as deep charge and discharge. In fact, deep charge and discharge is a major misunderstanding when many people use lithium batteries. Scientists have concluded through experiments that the number of deep charge and discharge is proportional to the battery life in the case of other environmental conditions. This will cause the battery life to end prematurely. Lithium batteries that have been used for a long time at the end of their service life can easily cause battery bulging and cause explosions.


2, overcharge and discharge and charge and discharge current is too large: This situation is often occurred when the protection board design is not reasonable and charging, we often like to charge the device for a while and then let your equipment The resistance is longer, but what many people do not know is that long-term overcharge and overdischarge will cause serious damage and damage to the performance of lithium batteries. Severe situations will cause explosions and other extreme conditions, so the battery is fully charged. Just like it, always plugged in the charger, sooner or later it will lead to a tragedy. At the same time, we have to charge and discharge the charger current and general electrical current load, too high current load can easily cause the battery internal short circuit, thereby destroying lithium ions, causing circuit safety hazards, the same reason, for charging The charger voltage is also the same. Therefore, we must pay attention to whether or not the charger is qualified when using the charger. However, after many accidents, the manufacturers finally took actions, adding protection or multiple protection for most manufacturers, especially electronic digital products, and trying to avoid this situation. However, it is still important for users to strengthen their awareness. Lithium batteries are extremely sensitive to temperature. If they are used below the freezing point for a long time, they may have a great impact on battery life. Long-term exposure to overheated environment will greatly shorten the battery life. In serious cases, the explosion will be caused by the increase of internal pressure. Even if there is no explosion, the battery will be quickly scrapped in high heat, and in some cases it is unfortunate because of the explosion of the battery. Most of the reasons for the death were caused by the high temperatures in its work environment.


Lithium power project As an old technology that has been over 30 years old, the regular brand production department already has very mature commercial technology, enough to ensure the safety of the battery in general use, and conducted actual tests, so long as we are good at using Our batteries do not pose too great safety risks to us. Here are some suggestions for safe use of lithium batteries:


1, the use of qualified charger: charging time is the high incidence of lithium battery explosion. Original chargers or qualified chargers produced by large manufacturers can guarantee battery safety more than compatible chargers.


2, the use of reliable batteries: try to buy regular lithium battery manufacturers battery or market famous brands, do not save money to buy "second-hand goods" or "parallel imports", this type of battery may be repaired, not as reliable as the original battery.


3, do not put the battery in extreme environments: high temperatures, collisions, etc. are important incentives for battery explosion, try to make the battery in a stable environment, away from high temperatures.


4, reasonable assembly and maintenance: Many people like to buy second-hand batteries core reorganization of the battery, and more people "courageous" to buy batteries themselves DIY assembled battery. However, improper assembly and misoperation can easily lead to accidents. In particular, the choice of battery protection board, the arrangement and selection of good protection board components, and the protection of the rational layout of printed PBC are very important, and the protection damage often becomes a battery killer. The culprit of the tragedy.

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