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Lithium battery or lead-acid battery electric vehicle which is better?
Time:Apr 07, 2022
Lithium batteries 48v are better. Lithium batteries are more than 3 times higher than lead-acid batteries in terms of volume specific energy or weight specific energy. Lithium batteries are smaller and lighter. Long cycle life.

Running far is not far, the key depends on the battery capacity. It is meaningless to say who is far.

For example, they are all 48V20AH. Lithium batteries and lead-acids are basically the same, because the capacity is the same, but lithium batteries are lighter, so they can be slightly farther than lead-acid.

But if the lithium battery 48V 10AH and the lead-acid 48V20AH, then the lead-acid is definitely far away, needless to say. To put it simply, whoever has the largest capacity can run farther. The advantage of lithium battery over lead-acid is that it is lighter and can discharge at a large current, and the rest are the same.
Can you search for the safety of lithium batteries with large capacity in series? cost feasibility? Why do mobile phone batteries explode? Although lead-acid batteries are bulky, they are much more stable than lithium batteries! The cost is basically acceptable! Stability, safety and cost are higher than lithium batteries! As long as it is a battery, whether it is a lithium battery or a lead-acid battery, it is a heavy polluting commodity!

1. At present, the number of lead-acid batteries for electric vehicles on the market is still higher than that of lithium batteries. The reason may be that the cost of lithium batteries is still relatively high. Therefore, in the design of the existing "lithium electric car" products, the capacity configuration of lithium batteries is often reduced to correspondingly reduce the implementation cost of the whole vehicle, which makes the models of the existing "lithium electric car" products too single.

Lead-acid batteries and lithium batteries cannot simply be judged as good or bad. Both have their own advantages and disadvantages and are suitable for different needs of people. At present, most of the lithium battery products on the market are "electric bicycles" with a short range. However, such as four-wheeled electric vehicles and four-wheeled electric scooters for the elderly, they are more suitable for "lead-acid batteries". .

Second, lithium ions mainly rely on lithium ions to move between the positive and negative electrodes to work. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: when charging the battery, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; during discharge, the opposite is true. Generally, batteries containing lithium elements are used as electrodes. At this stage, the most negative electrodes are graphite. Compared with lead-acid batteries, lithium batteries have the advantages of light weight, large specific capacity, and long cycle life. As a power source for electric mobility for the elderly, they are not only lightweight, portable and convenient to charge, but also help the whole vehicle products. "Lightweight and simplified" design.

3. The electrodes of lead-acid batteries are mainly made of lead and its oxides, and the electrolyte is sulfuric acid solution. In the charged state of the lead-acid battery, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead; in the discharged state, the main component of the positive and negative electrodes is lead sulfate.

Fourth, the two batteries are different except that they are energy storage devices. Lead-acid batteries are safer and cheaper, but have a lower energy density than lithium batteries, so lead-acid batteries are larger. At this stage, before the research on battery (energy storage) technology has not yet achieved a breakthrough, that is, before the "low-cost, high-performance" battery has not been put into commercial practical application, the existing lead-acid batteries and lithium batteries can be used. The transformation and upgrading of the excellent characteristics are combined as the main research topic for the present and the next period of time. It is believed that this will have a clearer direction for the development of electric scooters for the elderly and even the entire electric scooter industry in the future.

Lead-acid batteries for general electric vehicles. Mainly because of its high cost performance.

If you want to talk about battery life, other conditions are the same, and the capacity of the battery is the same, it may be that the lithium battery is a little better. Why, because the lithium battery is lighter, the weight of the whole car is lighter, and of course it can run farther.

But I still recommend lead acid. The main reason is:

One, it's cheap. Generally speaking, a set of lead-acid is only a few hundred yuan, and a set of lithium batteries is more than one thousand and nearly two thousand yuan.

Two, safety. Do you still remember the news that the woman in Nanjing was riding a lithium battery electric car the year before, because the weather was too hot, and the lithium battery behind the seat exploded, blowing her butt into a flower?

Third, lead acid is enough. The current lead-acid generally has a battery life of 50 to 60 kilometers, which is enough for home use. Lithium batteries are really unnecessary.

Under normal circumstances, lead-acid battery packs weigh 16-30 kg and are relatively large in size; while lithium batteries generally weigh 2.5-3.0 kg and are relatively small in size, so they are light to ride and easy to carry. From the quality point of view, it is difficult to define the quality of the two, but consumers can buy high-quality batteries produced by regular manufacturers according to their actual needs.

The cost of main materials such as positive electrode materials, negative electrode materials, current collectors, separators, and electrolytes of lithium batteries is much higher than that of lead-acid batteries. The cost of assembly auxiliary materials and external circuit systems of lead-acid batteries is extremely low.

Due to the manufacturing process, the labor cost of lithium batteries is relatively large. In the manufacturing cost, the labor cost of lithium battery accounts for more than 40%, while the labor cost of lead-acid battery is generally 10% to 20%.

The machinery and equipment used in the production of lithium batteries are expensive and of high value, and the depreciation and loss of machinery and equipment are relatively large. Most of the processes in the production of lithium batteries are irreversible, while lead-acid batteries are reversibly repaired and reused. The recycling value of lead-acid batteries after use is more than 40%, while the recycling value of lithium batteries is almost zero.

LiFePo4 lithium battery 48V are more than 3 times higher than lead-acid batteries in terms of volume specific energy or weight specific energy. Lithium batteries are smaller and lighter. Long cycle life. The cycle life of lithium batteries used in electric vehicles is generally more than 800 times, and lithium batteries using lithium iron phosphate cathode materials can reach about 2000 times, which is 1.5 to 5 times longer than lead-acid batteries. This greatly reduces the use cost of the lithium battery, prolongs the service life, and improves the convenience of use. It has a wide range of charging efficiency. This is the unique advantage of lithium batteries. When needed, the charging time can be controlled within 20min-1h, and the charging efficiency can reach over 84%. On the basis of further technological innovation, this feature will be better played.

The current energy density of lithium batteries is generally 200~260wh/g, and lead-acid is generally 50~70wh/g, so the weight energy density of lithium batteries is 3~5 times that of lead-acid, which means that under the same capacity, lead Acid batteries are 3 to 5 times that of lithium batteries, so lithium batteries have an absolute advantage in the lightweight of energy storage devices.

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