The ternary lithium battery charge and discharge times

Imported ternary lithium battery charge and discharge times can reach about 3,000 times, domestically produced is probably 800-1000 times.

The ternary material has advantages in terms of battery specific energy, specific power, large rate charging, low temperature performance, etc. The cycle performance is that the lithium iron phosphate material has obvious advantages, and the lithium iron phosphate battery is superior to the ternary material in safety. When selecting the battery, it can be selected according to different purposes. For example, the bus has a large space, and the battery has relatively low specific energy and specific power. The lithium iron phosphate battery can be selected to exert its good cycle performance, and the space of the car is limited. If the dosage is small, it is more suitable to use a high specific energy and a high specific power ternary material battery. The advantages and disadvantages of lithium iron phosphate battery and ternary lithium battery are analyzed in terms of safety, energy density, monomer nominal voltage, service life, application cost, and low temperature attenuation capability. Safety: ternary lithium battery: If the ternary lithium battery is internally short-circuited or the positive electrode material is in contact with water, there will be an open flame. Therefore, the general ternary lithium battery will have a layer of steel shell protection. Tesla gave the battery pack a full range of protection, but in extreme crashes, there are still fire hazards. Lithium iron phosphate battery: Lithium iron phosphate battery should be stable. The battery board will not explode and burn even if it is puncture or short circuit. It will not catch fire when it is heated at 350 °C (the ternary lithium battery will not be fired at 180-250 °C) Living). Therefore, in terms of safety performance, lithium iron phosphate battery is slightly better. Energy density: ternary lithium battery: The ternary lithium battery has high energy density and higher voltage, so the battery pack with the same weight has a larger capacity, the car runs farther and the speed can be faster. Service life: ternary lithium battery: The theoretical life of ternary lithium battery is 2000 charge and discharge cycles, but in actual use, after 900 charge and discharge cycles, the battery capacity is basically reduced to 55%. However, if the battery is charged and discharged every time it is controlled to operate in a cycle of 0%-50% or 25%-75%, even after 3,000 cycles of charge and discharge, the battery capacity can still be maintained at around 70%, but this requires Very good battery management system. Lithium iron phosphate battery: Lithium iron phosphate battery will be attenuated to 80% even after 3000 times 0-100% charge and discharge, so the battery management system of lithium iron phosphate battery is not so complicated, which further reduces the vehicle development costs. Application cost: Our country has abundant reserves of lithium ore and iron oxide phosphate, and it has advantages in manufacturing lithium iron phosphate battery. However, in China, there is a lack of cobalt ore, and it is somewhat difficult to manufacture a ternary lithium battery that must use cobalt. Therefore, it is very realistic for many car companies in China (including battery companies) to develop lithium iron phosphate batteries. Therefore, the electric vehicles that use ternary lithium batteries on the market nowadays are basically foreign brands (Japan Matsushita, Korea SK, etc.), and the price is also more expensive than the models with lithium iron phosphate batteries (same level). Low-temperature attenuation capability: The discharge performance of the ternary lithium battery at low temperatures is better than that of lithium iron phosphate batteries. Finally, the information about the development trend of BYD battery is attached: On October 24, 2017, BYD issued a record of investor relations activities, indicating that all PHEV passenger cars of the company have used ternary batteries. The future planning of the company may be in addition to public transportation. The field will continue to use lithium iron phosphate batteries, and other new models will use ternary batteries. Ternary material of column battery is current battery mainstream, Japanese, Korea battery is to use ternary material, at present ternary energy density still is a bit higher, and safe performance, consistent, also be complete OK (I say Japan and 3 star battery only). Domestic batteries high capacity (single over 2200) security performance

1. Look at the car, the service life of three to five years or low frequency is ternary battery pack, after all, the cycle life is only 500 times; public transportation and rental market must be on the lithium iron phosphate, after all, cycle life 2000 times . However, the future research direction of the cathode material is definitely ternary, because the cathode material of lithium iron phosphate is now also doped, which slowly blurs the definition of the ternary battery, such as lithium iron manganese phosphate battery, will it be in the future? There is a lithium iron phosphate (nickel cobalt manganese) lithium battery, and no one can say. But I don't really trust the structure of LFP. 2. The ternary battery you did not give it the rated voltage of the battery pack, no way. 3. Economical, I can only say that on the one hand, lithium iron phosphate is safe and cheap. On the other hand, if the country's future recycling policy for battery packs is introduced, lithium iron phosphate is very convenient for recycling. 4. Comparing the weight of the battery pack, the energy density of the ternary battery pack is only about 25 percent higher than that of lithium iron phosphate. Because the ternary battery pack requires a high-strength aluminum alloy protection structure, it needs a heat dissipation structure and requires water cooling. The system requires complex BIC and BMS mastering. I am not a data party. This is an intuitive experience in my work. 5. If you are in the north, you can only choose a ternary car. Never choose lithium iron phosphate. 6. I think the layman is good at seeing the manufacturers, Tesla, Beiqi, BYD, and the others don’t have to think about it.

The cost of the ternary battery is high, but the energy density is large, the full-rush voltage is 4.2 volts, the safety is not as good as lithium iron phosphate, the cost of lithium iron phosphate is slightly cheaper, but the energy density is low, the full-voltage voltage is 3.75 volts, and the ternary battery cell is not It may be very big, but a single unit of lithium iron phosphate can do 500 amps, do power battery, ternary for trolley, lithium iron phosphate for cart

Now the reason why lithium batteries can beat lead batteries in the market is because of energy density. Increasing energy density in a controllable range is a problem faced by all batteries. Lead batteries have been dead end. Lithium iron phosphate has a long life. If the energy density cannot be greatly increased, it will eventually lose the market. The ternary lithium is gradually increasing the energy density. Now the breakthrough graphene process can significantly change the battery life and fast charge capacity. Lithium battery is not necessarily the future, but it is now the mainstream technology of the new energy auto industry. Ternary lithium is the mainstream in the pure electric market. Lithium iron phosphate is the mainstream in the hybrid. The frequency of mixing and charging is higher, and the mileage is not emphasized. The requirement of pure electric mileage is higher. and high-energy-density batteries can significantly reduce the weight of the vehicle, thereby improving battery life. The ternary lithium modification is in the development and production. For example, the legendary lithium titanate now is the electric vehicle market has great potential. So if I have money, I will go to build a pure electric car. Solar energy, gasoline engine extended range of 100km life-saving travel plan, pure electric luxury class 300km battery life, the second-generation program. Mixing the 80km life programs have precedents, all have mature programs, mature products, only need to buy and assemble, and have passed the certification, just fine. Make money and die. Now Also need super capacitors, but because it is too expensive, waiting for the time to mature, fast charge stability, stable life, large capacity, instant super good, afraid of not a lithium battery dare.

Waterma signed a total of more than 10.3 billion Yuan in orders this year, relying on high-energy lithium-iron phosphate batteries, mainly in the passenger car and special-purpose vehicles market. BAK battery received orders for Hebei Yujie 18650 battery and Dongfeng Liuqi 10 million 2000 sets of power battery packs, mainly targeting the passenger car market. There are also small and medium-sized battery companies, Hengyuan New Energy, which has received an order of 1.5 billion Yuan from Zhejiang Geely, which has received industry attention.

The advantage of the iron-lithium battery relative to the ternary is that the safety is high and the cycle life is long. The current life expectancy of the three yuan has been greatly improved. In the future, with the improvement of the overall safety technology of the battery core, the advantages of iron and lithium will become smaller and smaller. After all, due to low gram capacity, low compaction, and low energy density due to low voltage platform, it is an insurmountable obstacle for iron and lithium from basic chemical materials.

The mainstream is definitely the ternary of the 18650 model. Ternary is now more suitable for power batteries, but the life of the ternary is generally 500-1000 times. The advantage of lithium iron phosphate is the long life of two thousand times. . However, the energy density is extremely low. So it is heavy and big. At present, it is mainly used in places where space requirements are not high such as electric buses. The mainstream battery in the market is dominated by the Japanese three-dollar. So now BYD can only force lithium iron phosphate. Recently, BYD has developed lithium iron phosphate, but the energy density is just catching up with the ternary. And just have been invested 10 billion into the new battery system. So it’s up to it to shine and it’s still early.

The regular name is “charge and discharge cycle”, not equal to “charge times”. The cycle refers to the battery from full charge to use of light. This is a cycle. If your battery is fully charged, use one tenth. The amount of electricity is then full, and this is a very ten cycle, so that it is charged 10 times before it is basically a loop. Similarly, from full power, use half and then fill, then use half to refill, this is also a cycle then you are charged twice. Therefore, the loop only depends on "how much electricity is discharged from the battery", and it is not directly related to the "number of charging".

Moreover, this nominal number of charge and discharge cycles is not said to be useless, but after so many cycles, the battery's ability to store power will drop to a certain extent.

For example, a lithium battery, the nominal charge and discharge cycle is "not less than 60% of the nominal capacity after 500 times"

That is, after 500 cycles, this battery can only store as much as 60% of the new battery, and the performance is reduced to a certain extent.

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