Every one knows that electric vehicle uses a motor、battery and electric control, no matter it is low-speed vehicle or pure electric vehicle. Although they are all electric vehicles, they have different treatment. They all use battery, but Pure electric vehicles use lithium batteries instead of lower-cost lead-acid batteries. From the perspective of environmental protection, lithium batteries are more environmentally friendly than lead-acid batteries.
The most important reason why lithium batteries cannot completely replace current lead-acid batteries is that the selling price of lithium batteries is more expensive than lead-acid batteries. Lithium batteries are more complicated to manufacture, and the cost is two or three times as much as lead-acid batteries, so the ex-factory price will naturally be more expensive. So most electric car owners actually prefer the lower cost of lead-acid batteries.
The seemingly high-cost lithium battery, compared with lead-acid battery which have same capacity, the weight of the lithium battery is only one-fifth of the lead-acid battery, and the charge and discharge life is long.The ternary polymer lithium battery has 1000 charging and discharging times, and the highest lithium iron phosphate battery has a charging and discharging life of 2,000 times.
Second is that lithium batteries are not crash resistant. Generally speaking, car owners will definitely not collide when driving a car.But if there is an accident or an accident, it must be a very strong impact. If you use a lithium battery, it may explode directly. The consequences are very serious.
The second is the high-current characteristics. Because the current of the car is very large at the start, it needs the battery pack to provide sufficient current amplification capability, and this is the area where lithium batteries are not good at.
As a decisive factor for promotion, lead-acid batteries have lower cost than lithium batteries. With the same capacity, lead-acid battery technology is mature, and the requirements for electrode materials, electrolyte, and assembly environment are low.The preparation of lithium batteries is complex, and dust-proof requirements, relative humidity, and accuracy must be controlled. In this way, the cost is more than three times more expensive than lead-acid batteries.
In addition, lead-acid batteries have better safety and stability than lithium batteries .Lithium-ion batteries tend to form lithium crystals on the negative electrode when they are discharged at high currents, which may pierce the diaphragm and cause the battery to short-circuit and explode. Due to the particularity of the car, to choose a battery with high safety and stability as the first consideration.
When the car starts, the battery needs to be discharged with an instantaneous current that more than 100A. Therefore, the battery must at least meet 5C (5 rate discharge). This can be easily achieved by lead-acid batteries, unlike lithium batteries, which operate at high rates., its performance will drop rapidly. The high current will directly affect the life of the lithium battery and increase the cost of use.Lead-acid batteries are far lower than lithium-ion batteries in terms of electrode materials, electrolyte, and assembly environment requirements. Take the electrode materials, lead-acid batteries use low-cost lead oxide and lead sulfate materials, while lithium batteries are Using materials such as lithium cobaltate, lithium titanate, graphene, etc., you can feel the difference in cost just by listening to the name.
Lithium batteries, with the development of new energy, great progress has been made in the development and use of lithium batteries, and many motorhome modifications have also begun to use lithium batteries. 1. Lithium battery classification: Currently, there are two mainstream lithium batteries in the market: lithium iron phosphate batteries and ternary lithium batteries. 2. Advantages Compared with lead batteries, iron-lithium batteries have obvious advantages in terms of charging and discharging efficiency, storage capacity, volume and weight. The lithium iron battery of the same specification is basically only half of the volume of the lead battery, and only about one-third of the volume. Lithium batteries have higher charging and discharging efficiency and longer service life.
The iron-lithium battery supports high current discharge, the standard discharge current is 3-5C, the high current continuous discharge supports 10c, and the instantaneous discharge current can reach more than 20C.This is why a small power bank can start the car. For example, a lithium iron battery with a capacity of 12V8ah can easily reach more than 160A when discharged at a current of 20C!The iron-lithium battery with a capacity of 20Ah can reach an instantaneous starting current of more than 400A, and there is no pressure to start the car.
How to filling water for lead-acid battery? We suggest you use Hubei Lham: Battery water filling gun.
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