Why don't pure electric vehicles use lead-acid batteries?

In recent years, despite the gradual decline of policy subsidies, the new energy boom has continued to cool down, allowing consumers to gradually calm down and gradually shift their focus from the advantages of licenses and restrictions to the maintenance costs brought by power lithium-ion batteries. There are many considerations for the cruising range. Especially when the power lithium-ion battery SOC (residual capacity) of the first batch of pure electric vehicles is gradually declining and entering the replacement period, the battery replacement cost of nearly half the purchase price or even higher has caused headaches for countless car owners. There is a problem, and that is why pure electric vehicles use such high-cost lithium batteries instead of lower-cost lead-acid batteries. Speaking of lead-acid batteries, many people have actually seen batteries on fuel vehicles, batteries on electric bicycles, and so on. Relying on its low price, mature technology, especially high and low temperature performance, stability and reliability, high safety, and good resource reusability, it has become the largest market share in the global chemical secondary battery, and the scope of application is also The most extensive battery, among which application fields such as starting and large-scale energy storage are the most prominent. Why don't pure electric vehicles use lead-acid batteries with better performance? Technology is the key. In terms of technological maturity, lithium batteries still have many bottlenecks that have not been broken through, but in terms of waterproof and dustproof, lead-acid batteries are not as powerful as lithium batteries. After all, the power lithium-ion battery of a pure electric vehicle is generally placed on the chassis of the vehicle. It is inevitable that there will be stumbling and short-term flooding in daily driving. At this point, the lithium battery that can reach the IP67 level is obviously safer. The second is volume. Due to the low battery density of lead-acid batteries, under the same battery capacity, the volume of lithium ion is much smaller and lighter than that of lead-acid batteries. Generally, the volume of lithium batteries is 2/3 of the volume of lead-acid batteries, and the weight is about The weight of lead-acid batteries is 1/3, and the reduction in weight can increase the endurance of electric vehicles by about 10%. Then there is life. Although in the field of recycling, lead-acid batteries are obviously more mature and more convenient, but in terms of life, compared with the lead-acid batteries that have only 400 times of deep charge and deep discharge, and the lifespan of only about 2 years, the cycle discharge exceeds 3000. Lithium batteries whose SOC is still above 70% and the lifespan is basically 3-8 years (under the experimental conditions, the remaining capacity of the lithium iron phosphate battery is 84 after 5000 cycles; after 3900 cycles of the ternary lithium battery, the remaining capacity 66% capacity left) is obviously more suitable. 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: What methods can improve the safety of lithium battery packs?