In the past six months, Samsung Note7 has been the limelight of the flight attendants. Every time the boarding broadcaster has to bother to inform the passengers: Please bring the passengers of Samsung Note7, send the mobile phone to the staff and fly again! In August of this year, Samsung launched its annual flagship mobile phone, Samsung Note7, which caused frequent spontaneous explosions in the world and eventually had to stop all recalls globally. The battery used by Samsung Note7 is a ternary lithium battery produced by Samsung SDI. The reason why Samsung battery is said is because the Samsung mobile phone battery crisis may have spread to the automotive field.
Speaking of Samsung SDI, everyone may be a bit strange, but there are not many people who use SDI batteries for new energy vehicles. Among them, the SAIC Roewe e950 and Dongfeng Motor's new energy models also use Samsung SDI ternary lithium-ion batteries . In addition, Samsung SDI also supplies batteries for the BMW i3 and i8 plug-in hybrid sports car, Volkswagen Passat GTE and Audi other electric cars . In addition, the Samsung battery crisis has also led to the temporary suspension of the JAC iEV6S.
The first killer of new energy vehicles: battery explosion
Speaking of pure electric cars , how can you not mention Tesla ! On November 4 this year, in Indianapolis, a Model S hit the tree at high speed, causing the vehicle to catch fire and two passengers in the car died. This is the fourth fire accident in Tesla this year.
The battery used by Tesla is the 18650 lithium cobalt oxide battery supplied by Panasonic. The battery of this material is extremely poor in safety compared with the lithium iron phosphate battery used in other mainstream electric vehicles, and has a high probability of fire, but has a high energy density. The reason why the Model S can have such excellent cruising range is that the energy density of the battery is increased, but the risk factor is also multiplied.
In recent years, new energy vehicles have flourished. With the subsidies of the state and the advancement of new energy technologies, the price of pure electric vehicles has gradually decreased, and they have entered thousands of households, providing a better choice for green travel.
Although the development of pure electric vehicles is better, it is accompanied by the popularity of electric vehicles. It also brings a lot of problems. In recent years, the problem of self-ignition of electric vehicles has also made the battery safety of electric vehicles popular. In this issue, is the lithium-ion battery really so "hot"?
Many friends know that gasoline is a flammable and explosive energy source. The power battery of an electric car is not vegetarian. The temper is also very hot. For example, this year's Samsung mobile phone "explosive door" incident that successfully topped the headlines of various media. It is caused by the explosion of the battery when the phone is charging, which also makes the public recognise the power of the lithium battery.
Stage, electric vehicle batteries used, mostly battery, lithium battery because, like other than the battery, which has a high voltage, high specific energy, long life charge and discharge, no memory effect, no pollution, faster charging It has the advantages of low self-discharge rate, low operating temperature range and safety, and is widely used in electric vehicles.
Generally, the most commonly used power batteries are lithium iron phosphate batteries, lithium manganate batteries , lithium cobalt oxide batteries, and ternary lithium batteries (ternary nickel cobalt manganese).
All of the above types of batteries have advantages and disadvantages, roughly summarized as:
Ternary lithium battery:
Advantages: high energy density and high tap density
Disadvantages: poor safety, poor high temperature resistance, poor life, poor power discharge, and toxic elements (the temperature of the ternary lithium battery increases sharply after charging and discharging, and the oxygen released after high temperature is extremely easy to burn).
Lithium iron phosphate battery:
Advantages: long life, large charge and discharge rate, good safety, high temperature, harmless elements, low cost
Disadvantages: low energy density and low tap density.
Lithium manganate battery :
Advantages: high tap density and low cost
Disadvantages: Poor temperature resistance, lithium citrate temperature rises sharply after long-term use, battery life is seriously attenuated.
Lithium cobaltate battery :
Usually used in 3C products, the safety is very poor, not suitable for power battery
Lithium batteries are very active due to the chemical nature of lithium metal, which makes the processing, storage and use of lithium metal very high.
Lithium battery using a separator to avoid contact with the positive and negative positive and negative electrodes. After a certain period or the violent collision occurs, the internal positive and negative electrodes of lithium batteries prone to misalignment separator, the lithium battery positive and negative internal directly connected, a short circuit, thereby causing spontaneous combustion of the battery.
The electrolyte of a common lithium ion battery is an organic liquid, and a side reaction can occur at a relatively low temperature to generate a gas, which is likely to cause combustion and explosion after expansion. If the electrolyte leaks under the collision, it is easy to burn.
If a fuel car collides violently, the car will be ignited unless the fuel tank ruptures. In contrast, after a severe collision with a fuel car, the chance of fire is lower than that of an electric car .
Conclusion: Compared with fuel vehicles, electric vehicles are more environmentally friendly, but the danger of power batteries is still very high. It is difficult to extinguish fires only by car fire extinguishers after fire. For electric vehicles, how to solve the safety of power batteries is still Very important topic.
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