Why Is The Current Mainstream Of Two-wheelers A Lead-acid Battery, And What Is The Difference Between Lithium Battery And Lead-acid Ratio?

Why Is The Current Mainstream Of Two-wheelers A Lead-acid Battery, And What Is The Difference Between Lithium Battery And Lead-acid Ratio?

Date:Feb 10, 2019

Why is the current mainstream of two-wheelers a lead-acid battery, and what is the difference between lithium battery and lead-acid ratio? The answers I read were not very comprehensive. I want to analyze the characteristics of the two batteries by comparing the following aspects. Lithium batteries currently have three kinds of lithium iron phosphate, lithium manganate and ternary lithium batteries. The ternary lithium battery (the ternary material is nickel-cobalt-manganese) has three kinds of lithium batteries, and the current ternary energy ratio is the highest. This battery is used as a comparison with a lead-acid battery. First, the weight ratio of the same capacity, the same capacity, lead-acid battery is about 3-4 times the weight of ternary lithium battery. The highest capacity single-cell 18650 Panasonic battery 3400mah voltage is 3.7V, the weight is 61.2g, a 12V20AH lead-acid battery is about 7.5kg. When changing to 1KWh (degrees), the weight is 4.86kg and 31.25kg respectively. The weight ratio of the highest ternary lithium battery and lead acid in the same capacity is 1:6.4 (protective shell and circuit board without lithium battery), and the ratio of lead-acid to lithium battery in the same capacity is calculated by the circuit board and battery protection facilities. Around 4:1. Second, the volume ratio of the same capacity compared to the volume of lithium battery must be calculated battery shell and circuit board, the common 12V20Ah lead-acid battery dimensions; length 181mm, width 76mm, height 169mm, volume is about 2.35L, to small The size of the battery pack of the cow N1 with a maximum capacity of 60V30AH is 309mm*184.5mm*148mm. The calculated size is 8.4L. When changing to 1KWh (degrees), the volume is 9.79L and 4.66L respectively. The volume of lead acid and lithium battery under the same capacity. The ratio is about 2:1. Third, the price under the same capacity is calculated by the average price of a single Panasonic 1860 battery is 20 yuan, 3.7V3400mah has a charge of 12.58WH, then the price of a 1KWH (degree) battery is about 1,589 yuan, and a group of 48V20AH price is about For the price of 580 yuan, the price of a lead-acid battery converted into 1KWH (degrees) is 600 yuan. It can be concluded that the price of lithium battery in the same capacity is about 2.6:1 than that of lead acid 1589:600, that is, the cost of lithium battery in the same capacity is 2.6 times that of lead acid (excluding battery pack and protection board). The lithium battery national standard is fully cycled 600 times, and it is about 3 years to ensure more than 80% capacity. 800 cycles of 60% capacity. Lead-acid batteries generally have a capacity of less than 60% in 300 complete cycles. According to the unified 60% capacity as the cut-off life of the power battery, the cost per unit time of the lithium battery is 1589/800=1.98 yuan/cycle, and the lead acid becomes 600/300 times=2 yuan/cycle cost, so look at the lithium battery and The cost of lead acid in the life cycle is similar. However, there is no discount on the old lead-acid battery. The bad lithium battery is not worth the money, but the old recycling price of lead-acid battery is about 40-45% of the new battery. Calculating the discount of the old battery, the single cost of the lead-acid battery is about 600*0.6=360 yuan, and the single-cycle cost is 360/300 times=1.2 yuan/time. The cost of using lithium and lead acid in the same capacity is 2:1.2 and is about 1.6:1. This is also why lithium battery is light and long-lived, but it is still not as popular as lead-acid in two-wheel electric vehicles: First, the cost of first-time car purchase is high (2.6 times lead acid). 2. Old batteries are worthless and lead to high comprehensive cost. (1.6 times lead acid)

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