Which is good for electric car lithium battery?

Lithium battery has no advantage in terms of price, safety and cruising range, and it is good for lead acid.

The advantages of lithium battery, light weight and good cycle life are not reflected on electric bicycles.

According to the cathode material system, usually a ternary material, lithium iron phosphate or lithium manganate material;

Comprehensive performance comparison:

The safety of all three materials can be safe, and the safety of lithium iron phosphate and lithium manganate is better;

Lithium manganate battery life is the worst and the cheapest compared to the other two;

lithium iron phosphate is relatively hot at present, but it is not very mature in general; lithium iron phosphate has a good life expectancy, but its low-temperature discharge performance is relatively poor. When used in relatively cold areas, the proportion of electricity that can be released is higher, less, appears to have a small capacity;

The ternary material battery is relatively neutral in terms of price, safety, life, production process, etc., and in the same type of battery of the same (voltage * capacity) specification, the weight and volume of the ternary material battery is much smaller than that of other batteries. Personally think that the most suitable lithium battery in the current stage should be a ternary material battery.

From the type of cell structure, there are cylindrical batteries, steel shell square batteries, flexible packaging (polymer) batteries, etc.; mainly these are composed of several types of batteries. There are many steel shell squares, and there are many cylinders. The soft packs are also developing well. It should be a trend; all kinds of advantages and disadvantages are not evaluated, and individuals prefer flexible packaging (polymer) batteries.

There are three kinds of lithium batteries: ternary material polymer portable lithium battery; lithium manganese oxide battery; lithium iron phosphate battery. The company uses a polymer ternary lithium battery.

It is recommended to first figure out your daily use. If it is used for transportation, it is not very heavy or manned. Usually, it is riding alone. It is recommended to buy a smaller one. Generally 48-60v is enough. Lithium batteries are recommended to buy relatively high energy density. For example, 48v20ah-60v20ah is riding in the air, one-third of the flat road, one-third of the flat road, one third of the slope, outdoor The temperature is 15 degrees, the whole speed is full, our atomic lithium battery test data is 48v20ah can ride up to 64 kilometers, 60v20ah atomic lithium battery can ride 72 kilometers. If you often load people with some items, it is recommended to directly use electric vehicles with 72v or higher voltage. Because the motor power is large, and the battery capacity is also large, the voltage is high and the current is small, and the efficiency is much higher. After the test, it is found that if you want to load, you must choose 72v electric car or higher voltage. I hope to help you. Lithium battery is recommended to choose 18650 lithium cobaltate or ternary polymer soft pack.

The advantages of lithium-ion electric vehicles relative to lead-acid batteries are environmental protection, light weight and long cruising range; the disadvantages are subdivided according to different lithium electrochemical platforms. For example, the manganese lithium system has a higher energy density and a shorter cycle life, but it is cheaper, the charge and discharge are less affected by temperature, and the increase of instantaneous current (starting, accelerating, climbing ability) has less influence on battery life. , but the safety performance and cruising range is poor. The iron-lithium system has lower energy density and longer cycle life, but it is more expensive, charge and discharge are affected by temperature, and the instantaneous current increases the battery life. Because of the small energy density, it may be larger in volume and weight. The ternary system is somewhere in between. But in general, lithium battery is more expensive, better iron lithium battery pack 36V/10Ah general battery cost is around ￥1000, three yuan is ￥700-900.

Lithium-electric electric vehicles are now divided into two types, one is lightweight, which is the ordinary bicycle plus motor, battery, controller, and the representative is Xi Desheng. One is electric motorcycle, and the representative is the calf. Some models of the portable type are not easy to disassemble. Lithium batteries are also divided into two types, one is a three-dimensional soft pack, the advantage is relatively safe, the probability of fire is greater than the explosion, the electric motorcycle has a ternary 18650, which is the type of lithium battery used by Tesla, domestic comparison Mature Mavericks are equipped with lithium batteries. Commercial lithium batteries mainly include Chaowei (soft pack ternary) and Tianneng (three yuan 18650), which are relatively reliable. Because the danger of lithium batteries is higher than that of lead-acid batteries, especially electric motors, the power is relatively large, and it is not recommended for inexperienced users. The first advantage is light, most can be removed and charged, the second is the regular lithium battery cycle life is higher than the lead-acid battery, the third is for the electric motorcycle players, support fast charge, if necessary, can support 0.5C charging, that is, Filled in 2 hours.

In fact, lithium ions mainly rely on lithium ions to move between the positive and negative electrodes to work. During charging and discharging, li+ is embedded and deintercalated between the two electrodes: when charging the battery, li+ is deintercalated from the positive electrode, and the electrolyte is embedded in the negative electrode, and the negative electrode is in a lithium-rich state; generally, a battery containing a lithium element as an electrode is used. At present, the most negative electrode is graphite. Compared with lead-acid batteries, lithium batteries have the advantages of light weight, large specific capacity, long cycle life, etc. It is used as an electric power source for electric vehicles in the elderly. It is not only lightweight and portable, but also helps the whole vehicle, "Lightweight and simple" design.

The electrode of a lead-acid battery is mainly made of lead and its oxide, and the electrolyte is a sulfuric acid solution. When the lead-acid battery is charged, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead. In the discharge state, the main components of the positive and negative electrodes are lead sulfate.

Both batteries are not all the same except for energy storage devices. Lead-acid batteries are safer and cheaper, but the energy density is lower than that of lithium batteries, so lead-acid batteries are larger.

Lithium batteries are more durable, consume less, charge and discharge more than 500 times, and have no memory. The general life expectancy is 4-5 years. Lead-acid batteries are generally used for deep charge and deep discharge within 400 times, and have a memory life of about two years. If you are using a maintenance-free lead-acid battery, you need to be aware that the battery has less water loss, and you do not need to add distilled water during use. In terms of durability, the lithium battery has good vibration resistance. The battery in a fully charged state is safely fixed. It vibrates for 1 hour with amplitude of 4 mm and a frequency of 16.7 Hz, there is no leakage, no battery expansion and rupture, and the open circuit voltage is normal. Good chargeability, 25 degrees Celsius, fully charged battery 0.1CA charge for 48 hours, no leakage, no battery expansion and rupture, open circuit voltage is normal, capacity retention rate is above 95%; high current resistance, fully charged state The battery 2CA is discharged for 5 minutes or 10CA for 5 seconds, and no conductive portion is blown, and there is no appearance deformationl

Lithium batteries are better. Lithium batteries are more than three times higher than lead-acid batteries, regardless of their volumetric energy or weight-to-weight 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. The lithium batteries using lithium iron phosphate cathode materials can reach 2000 times, which is 1.5 to 5 times higher than lead-acid batteries. This greatly reduces the cost of using the lithium battery, prolongs the service life and improves the ease of use.

The capacity of a lithium battery is generally 8-10 amps, and the capacity of a lead acid battery is about 20 amps.

The same 48V battery, in the case of full charge, lithium batteries and lead-acid battery electric cars can exercise 30-40 km, the speed is mainly depends on the size of the motor used.

Lithium batteries are more durable, consume less, charge and discharge more than 500 times, and have no memory. The general life expectancy is 4-5 years. Lead-acid batteries are generally used for deep charge and deep discharge within 400 times, and have a memory life of about two years. If you are using a maintenance-free lead-acid battery, you need to be aware that the battery has less water loss, and you do not need to add distilled water during use. In terms of durability, the lithium battery has good vibration resistance, the battery in a fully charged state is safely fixed, it vibrates for 1 hour with an amplitude of 4 mm and a frequency of 16.7 Hz, there is no leakage, no battery expansion and rupture, and the open circuit voltage is normal. Good chargeability, 25 degrees Celsius, fully charged battery 0.1CA charge for 48 hours, no leakage, no battery expansion and rupture, open circuit voltage is normal, capacity retention rate is above 95%; high current resistance, fully charged state The battery 2CA is discharged for 5 minutes or 10CA for 5 seconds, and no conductive portion is blown, and there is no appearance deformation.

The page contains the contents of the machine translation.