Comparison of lithium battery and lead acid battery

Compared with lead-acid batteries, lithium batteries have the advantages of high energy density, long life, small size, and light weight, which are expected to replace lead-acid batteries. Three years ago, experts in the industry predicted that in the field of manufacturing electric vehicles, lithium batteries could replace about 20% of lead-acid batteries in 2015, and can replace about 30% of lead-acid batteries in five years. However, today, lithium batteries actually replace lead-acid batteries by less than 10%, and it will be very difficult to achieve the goals in the next two years. According to data predicted by the industry association recently, the sales volume of lithium electric vehicles is about 3 million this year, and the total sales volume of electric vehicles is about 32 million. So where are the main obstacles to replacing lead-acid batteries with lithium batteries?

lithium battery

The price/performance advantage of lithium batteries is not outstanding. According to the dealers of many distribution lithium electric vehicles, the electric vehicle with domestic lithium battery has a high rate of repair. Lithium battery manufacturers made by domestic strong lithium battery companies and ordinary small and medium-sized lithium battery companies have a recovery rate as low as 5%, as high as 13%, and the price is very disparity: manganese-based materials 48V12Ah is about 500 yuan / group, nickel-cobalt-manganese ternary material lithium battery 48V12Ah about 650 yuan / group. But the pack lithium battery 48V12Ah is only about 320 yuan / group. However, this pack lithium battery has been used for less than one year, and the battery capacity has been greatly attenuated and can no longer be used. Compared with lead acid, the lithium battery of manganese-based materials and ternary materials has little advantage except for its small size and light weight. Its use has been more than 2 years, and the attenuation of the battery has been unable to meet the long distance travel. Requirements.

Excessive repair time has seriously restricted the use of consumers. In the event of a lithium battery failure, it takes a week or so, or even longer, to make consumers wait impatiently and lose confidence in use. The reason is that the dealer can not repair or replace the battery with problems inside the lithium battery, must be transported to the manufacturing enterprise by express delivery, and the battery is repaired by professional equipment. This is one of the keys to restricting the large-scale replacement of lead-acid batteries for lithium batteries.

Lithium batteries are too "precious" and cannot withstand the same as lead-acid batteries. During the use of lithium electric vehicles, they can't withstand the impact of throwing and throwing. Once the lithium battery is pierced or the lithium battery is broken, the lithium battery may burn and explode; the lithium battery has a very high demand for the charger. High, can not be charged like a lead-acid battery with a coin-operated charger on the roadside. Once the current is too large, the breakdown of the protective plate inside the lithium battery may cause burning or even explosion.

Due to the uneven quality of lithium battery products, a large number of low-end lithium batteries impact the market, making dealers particularly cautious about the choice of lithium-electric car companies, which manufacturers can close their doors after a year and a half, and purchases come in. The lithium battery will have to be handled by the dealers. It can be seen that lithium batteries need to replace lead-acid batteries. If you do not change the above problems, it will be difficult in five years.

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