At the present , the "animality" of lithium batteries has not yet been clarified and mastered. It must be handled carefully under the conditions applicable to the operation of large-capacity storage and vehicles. Sha Yongkang， The wave of Chinese enthusiasm for new-energy vehicles is making lithium-ion batteries, once an excellent convenience for mobile communications and audio and video mobility, one among the most well liked areas of competition and concern. But as more people struggle with mileage, battery life and even the way to affect used batteries, one among the elemental questions that seems to be overlooked is -- is it safe enough?

In March 1978, when Sitanli·weitinghanmu, a chemist(engineer) at the Exxon company within the us , invented lithium batteries, it's going to not have occurred to him that within the next 30 years approximately , this invention brought great changes to human scientific and technological life. Lithium, The lightest metal known in nature has since become more intimate humans. At that point , Weitinghanmu made titanium sulfur compounds as negative poles and lithium metals as positive poles, making the world's first lithium battery prototype. The working rule is to understand the method of charge and discharge by forming a current circulation between the positive and negative poles of the battery. Therefore, lithium batteries also are called lithium ion batteries.

Over the decades, with the continual improvement of positive and negative materials, the manufacture of smaller lithium batteries with greater energy density and lower prices, the arrival of cellphones promoted the lightness, and has became popularized in electronic. Music players, for instance , are seen today because the inevitable choice for electric cars that are hip But the frequent explosions of cell phones and music players 'batteries in recent years seem to be sounding alarm bells -- something that creates life easier than it seems. is that the manufacturer loosening the standard management? does the designer changes any elements of battery?

A mobile lithium cell contains but 5G of lithium metal, an initial electric micro-sedan, if the storage power is quite 30kWh, the battery pack contains about 50kg of lithium metal, and therefore the explosion of the mobile cell will still be talked about. Change, if a gaggle of micro-sedan batteries occur, the results are unimaginable.There is case at China where lithium battery been mounted on electric device and listed in garage. within the evening, they suddenly caught fire. along side the whole vehicle, they were reduced to ashes. a couple of months ago, there was also a ignition of hybrid buses, but it had been discovered and disposed of. Early, it isn't bad. Obviously, it's the responsibility of the battery and electric industry to remain calm and plan for the longer term .In fact, lithium-ion batteries have explosive safety hazards for several reasons that have yet to be solved, but they're obviously associated with their own constituent elements.

Normally lithium batteries were made by 5 element: positive electrodes, negative electrodes, diaphragms, electrolytes, monomer packag. therein year, Sony successfully developed the primary batch of economic lithium batteries whose positive poles were made from lithium compounds, lithium cobalt, but because cobalt was a rare metal, manganese, iron, vanadium, nickel, etc. were later used, also as polymers. Synthetic materials, even using air as an electrode medium, Different positive materials have different energy, safety, and dealing voltage. Negative electrodes are played by graphite and varieties of mixing, synthesis, and composite material. The graphite molecule space may be a crystal lattice for lithium ion storage.During charge, most of the positive lithium ion element is transferred to negative pole spaces. When the lithium ions on the negative pole accumulate excessively to a particular limit, the lithium ions will overflow and form dendritic crystals. These crystals grow and spread, piercing the diaphragm, and make the positive and negative poles. Contact, a brief circuit then occurs. At this point , the short will instantly release an outsized amount of warmth , boiling hot and burning electrolytes, and eventually exploding, called "thermal failure." additionally , heat , puncture, breakdown, metal chip connection, and extrusion of the battery caused by vehicle collisions have all become the explanation for thermal failure within the short-circuit of the positive and negative poles.

Therefore, although some lithium batteries that use solid polymers as electrolytes now reduce the likelihood of explosion because they are doing not leak fluid, because lithium batteries convert external charged electricity into energy and store it within the battery through internal chemical reactions, energy is additionally converted into the output of electricity through chemical reactions. This process produces temperature, and if the temperature is just too high, the danger will follow. What's more, the lithium battery itself has the characteristics of self-discharge, that is, under the condition that the battery isn't charged or kept, it's undergoing chemical reactions of varying degrees of speed and speed. The battery features a low self-discharge rate with excellent performance, and the other way around . "Self-discharge rate" is extremely high. The reaction inside may be causing music player occured on the table to explode while turn off. Charging exothermic and discharge endothermic may be a feature of lithium batteries, but sometimes charging too fast also can cause heat phenomenon. this is often because the reaction is just too late to convert electricity into energy . When discharging, the battery warming is energy . Too late to convert into electricity . Therefore, when charging, it's generally managed by the management system, but there'll be problems when discharging. Based on this principle, the present discharged by a lithium battery shouldn't be overlarge . If the present is just too large and therefore the duration is just too long, it's going to cause the reaction to heat up and warmth up, and even explode.In fact, the concept of lithium batteries which will be charged quickly and discharged quickly is comparatively fast compared to lead-acid batteries. However, if the limit of lithium batteries is exceeded, the danger could also be lurking shortly away. As for a way much current discharge is suitable for lithium batteries, it should be determined by the particular situation. However, for the driving conditions of automobiles, instantaneous large current discharge may be a common occurrence. this is often a test for lithium batteries. Now, the method of charging and discharging is controllable and may be reduced by manufacturing processes, metal powders, dust, artificial, etc., but the reaction within the battery is currently difficult to regulate .

From now of view, during the utilization of lithium batteries, it's a miniature "active volcano", and therefore the end-of-life lithium battery seems to be an "extinct volcano." After scrapping, as long because the dismantling body isn't understood, the "five major elements" are complete, and therefore the reaction won't be interrupted, but the degree are going to be reduced. Therefore, the battery recycling station will seal the lithium battery separately and regard it as a dangerous substance. After analyzing the principle of lithium batteries and therefore the factors that cause failure, developers and makers got to recognize the twin faces of lithium batteries, angels and demons, and wish to seek out how to attenuate safety hazards. For example, the stage Tiger lion performance must be directed by a trainer. at the present , the "animality" of lithium batteries has not yet been clarified and mastered. It must be handled carefully under the conditions applicable to the operation of large-capacity storage and vehicles.