Dangerous.
Take Yadi electric vehicles, Mavericks electric vehicles and Emma electric vehicles as examples. When charging the lithium batteries of these electric vehicles, do not charge them at home. Safety risks when charging. Since the lithium batteries of electric vehicles are filled with explosive and combustible substances, once the lithium battery is overcharged or there are combustible materials around it, it will easily explode and catch fire after runaway thermal.
Lithium batteries are more likely to explode than lead-acid batteries. Continuously charging the battery without protective measures will pose a great safety risk.
Especially now, when the weather is hot or the ambient temperature is relatively high, it will also cause some organic matter to melt and shrink inside.inside the battery, causing the positive and negative poles of the battery to short circuit. circuited, which will eventually cause the battery to burn and explode. Fuels and oxygen are available. Therefore, once a lithium battery catches fire, it "burns more and more vigorously." It cannot be extinguished with an ordinary dry powder fire extinguisher. It can only be extinguished with a large amount of water.
Lithium batteries can generally be charged and discharged 300 to 500 times. It is better to partially discharge lithium batteries than to fully discharge them, and to avoid frequent full discharges.
Once the battery leaves the production line, time begins to tick. Whether you use it or not, the lifespan of lithium batteries only lasts the first few years. The decrease in battery capacity is due to an increase in resistancethis internal caused by oxidation (which is the main cause of the decrease in battery capacity). Eventually, the cell's resistance reaches a point where, even though the battery is fully charged, it is unable to release the stored energy.
A charge cycle means that all of the battery's energy is used from full to empty, then charged from empty to full. This is not the same as a single charge.
For example, a lithium battery only uses half its power the first day, then it is fully charged. If it is still the same the next day, i.e. if you charge it half and charge it twice in total, this can only be counted as one charging cycle and not two.
Therefore, multiple charges may typically be required to complete a cycle. Each time a charge cycle is completed, the battery capacity decreases a little. However, this reductionpower action is very low. High quality batteries retain 80% of their original capacity after multiple charge cycles. Many lithium-ion powered products are still in use after two or three years. Of course, lithium batteries still need to be replaced once their lifespan is reached.
Reference for the above content: Baidu Encyclopedia - Lithium Batteries
Are lithium batteries used in new energy vehicles dangerous goods?
According to “According to the United Nations Model Regulations on the Recommendation on the Transport of Dangerous Goods, lithium batteries are listed as dangerous goods and are classified as dangerous goods category 9. Their numbers UN are: lithium-ion batteries (including lithium-ion polymer batteries) (UN3480), lithium-ion batteries (including lithium-ion batteriespolymer) packed with equipment (UN3481), lithium-ion batteries (including lithium-ion polymer batteries) contained in equipment (UN3481); primary lithium batteries (UN3090), primary lithium batteries packed with equipment (UN3091) and primary lithium batteries contained in equipment (UN3091).
Lithium batteries used in Pacific Automotive Network's new energy vehicles are dangerous goods. As batteries are dangerous goods, there will be one more declaration step in the normal booking process than regular goods. , the declaration process must therefore be carried out immediately after the approval of the cabin and the mention of the box. The declaration process requires the use of a dangerous package certificate.
Lithium batteries used in new energy vehicles are subject to explosion risksand spontaneous combustion.
New energy vehicles using lithium-ion batteries as energy storage devices have now become the mainstream of the market. However, with the promotion and application of new energy vehicles, the problem of spontaneous combustion of lithium-ion batteries and the safety of vehicle use have become concerns.
Lithium is the most reactive metal in the world. Lithium-ion batteries have small size, high capacity density and high energy density, making them the first choice for electric vehicles. Lithium-ion batteries use the gain and loss of electrons as well as the migration and accumulation of lithium ions to achieve electrical energy storage.
When the battery is charged, the lithium atoms in the positive electrode lose electrons and become lithium ions, resulting in a difference inpotential. The lithium ions present in the electrolytic medium migrate and accumulate towards the negative electrode due to the potential difference. When discharging, the whole process is reversed. The whole working process is completed by the gain and loss of lithium metal in the electrode and the migration of electrons and lithium ions in the electrolyte.
However, the chemical properties of lithium are too reactive. When lithium metal is exposed to air, it undergoes a violent oxidation reaction with oxygen, resulting in combustion and explosion.
Precautions for using lithium batteries in new energy vehicles:
1. Fires caused by thermal runaway of lithium batteries caused by external forces are the most common. Since lithium power batteries currently used in electric vehicles are composed of a large number ofe lithium-ion battery packs, the entire lithium power battery pack is very large and placed on the chassis. In this way, it is easy to squeeze the battery when the vehicle collides, causing the battery to deform, crack, short circuit and other damage, and trigger thermal runaway.
2. In order to prevent air from entering, lithium-ion batteries are packaged in airtight containers and are usually equipped with stainless steel and aluminum alloy casings to prevent external damage. For example, Tesla's electric cars even use titanium alloy protective plates to prevent damage to the battery box when using the car, especially during road accidents.
(Images/Text/Photos: Pacific Automotive Network Calling the Beast Q&A)