As we all know, current pure electric vehicles mainly use ternary lithium batteries, and some models use lithium iron phosphate batteries. Both batteries are lithium batteries. In addition to lithium batteries, there are also lead-acid batteries. So, compared with lead-acid batteries and lithium batteries used in new energy vehicles, which is more cost-effective?
Actually, to answer this question, we first need to understand what a lead acid battery is. In fact, a lead-acid battery has an electrode made primarily of lead and its oxide. Its electrolyte is a solution of sulfuric acid. The main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead. Like lithium batteries, lead acid batteries are also greatly affected by temperature. The hardThe life of lead-acid batteries increases as temperature increases, but gradually decreases above 50 degrees Celsius.
It should also be noted that the nominal voltage of a single cell lead acid battery is 2.0 V. In normal applications, single lead acid batteries can be connected in series, e.g. 12 V , 24 V or 2.0 V. 36V lead acid batteries. However, lead-acid batteries have a lower energy density and a shorter lifespan than lithium batteries. The current energy density of lithium batteries is generally 200-260 wh/g, while lead batteries are generally 50-70 wh/g. For new energy vehicles, especially pure electric vehicles, energy density will affect the vehicle range to a certain extent. From this point of view, lithium batteries are therefore more cost-effective.
In terms of lifespan, the number of dec cyclesFull discharge of lithium batteries is about 1,000 times, and the number of full discharge cycles of lithium iron phosphate batteries can reach about 2,000 times. For lead-acid batteries, the service life is relatively short, and the number of full cycles and discharge is basically about 300-350 times. Therefore, in terms of service life, lithium batteries are also longer than lead-acid batteries.
Summary: It is precisely because lithium batteries have more advantages in energy density and service life that new energy vehicles use lithium batteries with higher performance . At present, in addition to the currently used ternary lithium batteries and lithium iron phosphate batteries, many automobile manufacturers and battery manufacturers have begun to study solid-state lithium batteries. I think that'with the development of technology, this type of battery will also be developed. be applied to On the car.
This article is from the author of Autohome Chejiahao and does not represent the views and positions of Autohome.