Analysis of the advantages and disadvantages of three types of power lithium-ion batteries

At present, there are three types of power lithium-ion batteries that are commonly used in electric vehicles and have more development potential: lead-acid batteries, nickel-hydrogen batteries and lithium batteries. To talk about their respective comprehensive performance, we have to mention two concepts, one is the specific energy, the other is the specific power. To put it simply, they refer to the durability and power of the battery. The power lithium ion battery with higher specific energy is like the tortoise in the tortoise and the hare race. It has good endurance, can work for a long time, continuously releases more energy, and has a long cruising range; the power lithium ion battery with higher specific power is like a one-hundred-meter race. The Bolt is fast, powerful, and has a strong explosive power, which can ensure good acceleration performance of the car. Obviously, only the power lithium-ion battery with high specific energy, high specific power and low price and easy to maintain is the first choice for the main energy source of electric vehicles. Lead-acid batteries are currently the most widely used battery for electric vehicles. According to incomplete statistics, 90% of the processed electric vehicles use lead-acid batteries. This is mainly due to its many advantages: development history It has a long history, relatively mature technology, high specific power, cycle life up to about 800~1000 times, and low cost. However, the specific energy of lead-acid batteries is very low, only about 40Wh/kg, fast charging technology is not yet mature (generally slow charging is over 8 hours), and pollution is serious. The advantage of Ni-MH battery is that the specific energy and specific power are relatively high (relatively speaking), and the fast charging performance is better. It can be fully charged with 40% to 80% of the capacity in 15 minutes, and the operating temperature range is wide. However, the cycle life of nickel-metal hydride batteries is short, 600 times, and the price is expensive. 1000Wh is about 600~800 US dollars. Only when large-scale processing is expected, can it be reduced to 250 US dollars. Lithium batteries have high specific energy and specific power, which can reach 150Wh/kg and 1600W/kg, respectively, have a long cycle life of about 1200 times, and the charging time is short, which is 2~4h, and the use voltage can reach 4V. The use safety is also relatively good. However, lithium batteries are expensive, have poor fast charge and discharge performance, and have overcharge and discharge protection problems, which affect the further application and development of lithium batteries. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How to repair 18650 lithium battery charger