Why electric vehicles did not choose lead-acid batteries
It seems that lead-acid batteries are safe and cheap, and the era of fuel vehicles has been fully popularized for loading, but why are few electric vehicles choosing lead-acid batteries as power batteries? This has to mention the shortcomings of lead-acid batteries.
The first is the low energy density. The energy density of current lithium batteries is generally 200 ~ 260wh / g. Although lead acid has been developed for many years, the hard conditions are still limited to 50 ~ 70wh / g. It is 3 ~ 5 times or even higher than lead acid, which means that under the same capacity, the volume of lead acid battery is at least 3 ~ 5 times that of lithium battery, so in the lightening and miniaturization of energy storage devices, lithium The battery has an absolute advantage.
The second is the cycle number and memory effect. At present, the basic cycle number of lithium batteries has thousands of random times, and there is no memory effect. The advanced management logic can effectively control the battery attenuation ability; but on the other level, lead-acid batteries are completely No, currently the lead-acid cycle is basically about 350 times, and it has a certain memory effect. Although the price is cheaper, when it is used as a power battery, especially for vehicles that travel long distances and long distances, it is completely useless .
Therefore, even if it is rare, there is indeed a precedent for using lead acid as a power battery. For example, our common battery car, or "electric horse", is indeed a brand model that uses lead-acid batteries. Kilometers, users can disassemble and screw them home to charge, which is very convenient.
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