A brief analysis of why lithium battery electric vehicles are difficult to popularize

Lithium batteries for electric vehicles are mainly divided into three categories. The first is ternary lithium, which is also the most widely used lithium battery, the second is lithium iron phosphate, and the third is lithium titanate, which has a very low penetration , The number of users is very small. First of all, the ternary lithium battery is mainly processed by Tianneng and major manufacturers, and the ternary lithium battery used by Tianneng is 18650 lithium battery. The ternary lithium battery is mainly soft-packed ternary lithium, which belongs to the ternary lithium type, 3.7v, 4.2v full charge. We know that lithium batteries are connected in series by batteries with many thin wires in the middle. If the motor power is 500W or above, or even 800W or 1000W, the battery will not be able to withstand long-term high-current discharge. When our cars carry too much weight, such as when we take people to climb a steep mountain, it is easy to burn the wires and even the battery, which is a safety hazard. A few days ago we saw a news report that a lithium battery was on fire somewhere. Then there are relatively high prices, usually several times that of lead-acid batteries. In addition, lithium batteries are not recyclable, which means they are useless when they are discarded. This may be an important reason why lithium batteries cannot really replace lead-acid batteries. Lithium batteries (rechargeable) need to be protected due to their own characteristics. Because the material of the lithium battery itself determines that it cannot be charged and discharged, overcharged, short-circuited, and charged and discharged at ultra-high temperatures, a delicate protection board and a current safety device always appear in the battery package of the lithium battery. 31. The protection function of PNG lithium battery is usually completed by the cooperation of the protection circuit board and current devices such as PTC. The protection board is composed of electronic circuits, which can accurately monitor the voltage of the battery and the current of the charging and discharging circuit at -40℃~+85℃, and control the on and off of the current circuit in time. PTC prevents serious damage to the battery at high temperatures. Ordinary lithium battery protection boards usually include control ICs, MOS switches, resistors, capacitors and auxiliary device fuses, PTC, NTC, ID, memory, etc. When everything is normal, the control IC controls the MOS switch so that the battery and external circuits can be turned on. When the battery voltage or circuit current exceeds the specified value, it immediately controls the MOS switch to protect the safety of the battery. In the normal condition of the protective board, Vdd is high level, Vss and VM are low level, and DO and CO are high level. When any parameter of Vdd, Vss and VM is converted, the level of DO or CO will change. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Correct Lithium Battery Charging Skills