Stick to using lithium iron phosphate batteries

The stability of lithium iron phosphate battery at high temperature can reach more than 390 ℃, which guarantees the high security, so that the battery will not lead to explosion or cumbustion due to overcharge, high temperature, short circuit and impact. It can easily pass the needle thorn experiment. The security feature is still in the immature stage of the new energy automotive industry in China.

Four, from China's new energy vehicles using the object of consumption characteristics and habits, the ternary lithium electricity power battery is not suitable for China's new energy car.

Tesla was known as the "toy" of the rich, assembling battery capacity design range of 400 km, but most of the time, the actual operation is about 200 km, is a pale imitation, thus guaranteeing cycling life. But most of China's new energy vehicles used for bus, government official, vehicle and the passenger vehicle, its use characteristic is that most of fixed-line and frequency requirements, each day is a deep filling, ternary lithium electricity under the condition of DOD95 % above, capacity attenuation speed, cycle life is only less than half of the lithium iron phosphate batteries.

New energy vehicles using 8 years on average, power lithium battery if put in a deep filling conditions, maintain more than 80% of the capacity, the service life of the ternary lithium electricity will be less than three years, and lithium iron phosphate battery basic can satisfy the use requirement of eight years.

Under the condition of the relevant national subsidy policy, for the first time to buy new energy vehicles have a corresponding government subsidies, but the second purchase battery was no subsidies. Ternary lithium battery in new energy vehicles use cycle, need to replace two batteries, will greatly increase the economic burden of users, and won't be accepted by end users.

If the ternary lithium electricity to get the same service life as the lithium iron phosphate, its only a pale imitation, needs to increase at least 50% or more of the battery capacity. So, the advantage of its high energy density will be lost, the volume will be bigger than with the performance of lithium iron phosphate batteries, battery weight will be heavier, its price is much higher than the lithium iron phosphate batteries.

In May 2011, equipped with South Korea's LG chem ternary lithium battery power general most classic volt hybrid cars, collision tests in the United States. Test smoke and fire happened the second time, third time test spontaneous combustion happened in seven days, so the United States by the national highway traffic safety administration NHTSA's investigation, combined with the market only a year of almost 6000 volt, for batch appear below 80% battery capacity attenuation and a large number of recall. LG chem as a global leader of ternary lithium electricity, its production of ternary lithium electricity safety and capacity retention still such, demonstrates the ternary lithium electricity, in fact is not suitable for assembly in the new energy vehicles.

Five, lithium iron phosphate batteries will be the most suitable for the development of electric vehicles in the future.

Predictably, the development of pure electric passenger cars, special for the future, will have the following characteristics: one is the formation of three kinds of models, namely below 1.3 tons, 1.3 ~ 1.7 tons and 1.7 tons. Corresponding per KWH, 10 km range respectively, 8 km and 6 km, the corresponding assembly battery weight, also respectively is 300 kg, 500 kg and 500 kg. Second, all battery assembly dc fast charging and slow filling two kinds of charging ways. Three is both body and chassis will use the new material, light-duty walk route of composite materials, such as aluminum alloy, carbon fiber composite materials, etc.

Therefore, the future development of electric vehicles in China, higher the energy density of power battery for the sake of their low point is no longer a major problem, because the vehicle from the security, center of gravity stability design, need to keep a certain weight. Lighter, body and chassis battery), is a kind of brand-new car system design - body and chassis for lightweight design, lithium iron phosphate battery pack to form a complete set of design, to guarantee the stability of body weight and body weight.

In the popularization of new energy vehicles whether large-scale popularization, is the use of safe, stable and reliable performance and low cost, and only then, can be accepted by the market and the public favorite.

Combination of lithium iron phosphate batteries, can guarantee the energy density of 100 ~ 120 wh/KG, coupled with the best security and foreseeable economy will be the best choice for China's new energy automobile power battery development.

We only don't doubt, don't slack off, and do not, believe after 20 years, China's new energy cars are popular, and the heart must be lithium iron phosphate power battery。

Lithium iron phosphate batteries, refers to the use of lithium iron phosphate as the anode material of lithium ion batteries. Lithium ion battery anode materials mainly have cobalt acid lithium, lithium manganese acid lithium, nickel, ternary material, lithium iron phosphate, etc. The cobalt acid lithium is at present most of the lithium ion battery cathode material.

To improve the performance of security

Lithium iron phosphate crystals in P - solid O key, difficult to decompose, even in high temperature or overcharge when also won't like cobalt acid lithium structure collapse fever or strong oxidizing substances, thus having good security. A report pointed out that the practice of acupuncture or short circuit experiment found combustion phenomenon in a small number of samples, but no one explosion occurred, and overcharge experiments using several times greatly beyond their discharge voltage of high voltage charging, found that there are explosive. Even so, the overcharge safety than common liquid electrolyte cobalt acid lithium batteries, has greatly improved.

The improvement of the life

Lithium iron phosphate battery refers to the use of lithium iron phosphate as the anode material of lithium ion battery.

Long life cycle life of lead-acid battery in about 300 times, the highest is 500 times

Lithium iron phosphate batteries

Lithium iron phosphate batteries

, and lithium iron phosphate power battery, life cycles to reach more than 2000 times, the standard charging rate (5 hours) to use, can reach 2000 times. With the quality of the lead-acid battery is "new half a year, half a year, maintenance, maintenance and half year old", at most 1-1.5 years, while the lithium iron phosphate batteries used under the same conditions, the theory of life will reach 7 ~ 8 years. Comprehensive consideration, the price performance ratio in theory for lead-acid battery is more than four times. Large current discharge can be as big 2 C fast charge and discharge current, under the special charger, 1.5 C can make battery charging 40 minutes, starting current can be up to 2 C, lead-acid battery is the performance.

High temperature performance is good

Lithium iron phosphate can reach 350 ℃ to 500 ℃ and the electric peak and cobalt acid lithium manganese acid lithium only at about 200 ℃.Wide range of operating temperature (20 c -- - + 75 c), have a high temperature resistant properties of lithium iron phosphate can reach 350 ℃ to 500 ℃ heating peak lithium cobalt and lithium manganese acid and acid only at about 200 ℃.

The large capacity

With greater than ordinary battery (lead-acid, etc.) capacity.5 ah - 1000 (monomer)

No memory effect

Rechargeable battery under the condition of are often filled with not to put the work, the capacity will quickly lower than the rated capacity values, this phenomenon is called memory effect. Memory like nickel metal hydride, nickel cadmium battery, and lithium iron phosphate batteries do not have this phenomenon, the battery no matter in what condition, can use increases with the increasing charge, do not need to first put the recharging.

Light weight

The same specification of lithium iron phosphate battery capacity volume is two-thirds the size of lead-acid battery, weight is the 1/3 of lead-acid batteries.

Environmental protection

The battery is generally regarded have no any heavy metals and rare metals (nickel metal hydride battery of rare metals), non-toxic (through the SGS certification), no pollution, comply with European RoHS, is absolutely green battery certificate. So the lithium battery is favored by the industry, mainly environmental considerations, so the battery and listed in the "863" during the tenth five-year national high-tech development plan, has become the national key support and encourage the development of project. With China's accession to the WTO, Chinese exports of electric bikes will increase rapidly, and into Europe and the United States of electric bicycle has asked equipped with battery from pollution.

But experts say, lead-acid battery caused by environmental pollution, mainly in non-standard production process and recycling. By the same token, the lithium battery belongs to new energy industry is good, but it can't avoid the problem of heavy metal pollution. In the metal material processing such as lead, arsenic, cadmium, mercury, chromium is likely to be released into the dust and the water. The battery itself is a kind of chemicals, so is likely to produce two kinds of pollution: one is the production engineering process of waste pollution;2 it is scrapped after the battery pollution.

Lithium iron phosphate battery also has its disadvantages: low temperature performance is poor, for example, tap density is small, the anode materials such as volume of lithium iron phosphate battery capacity than cobalt acid lithium and other lithium ion battery, so don't have an advantage in terms of micro cells. And when used for power battery, lithium iron phosphate batteries and other batteries, battery consistency issues needs to face.

The contrast of power battery

Is currently the most promising application in power type lithium ion battery cathode material basically has modified lithium manganese acid (LiMn2O4), lithium iron phosphate (LiFePO4) and nickel cobalt manganese acid lithium (Li (Ni, Co, Mn) O2) ternary material. Nickel cobalt manganese acid lithium cobalt ternary material due to the lack of resources and nickel and cobalt into high price fluctuation and large, is generally believed that it's hard to become the electric car with the mainstream of power type lithium ion battery, but can and spinel lithium manganese acid mixed in a certain range.

Industry application

Coated carbon foil bring lithium electricity industry technical innovation and industry promotion

Improve lithium electricity product performance improve the discharge ratio [1]

As the requirement of domestic battery manufacturers, battery performance is increasing day by day, generally recognized by the domestic new energy battery materials: conducting materials and conductive coating aluminum foil/copper foil.

Its advantage lies in: in the treatment of battery materials, often have high rate charge and discharge performance is good, bigger specific capacity, but the cycle stability is poorer, attenuation serious wait for a reason, have to do choose to give up.

Product application, golf in the charter in the battery pack

Product application, golf in the charter in the battery pack

This is a magical coating, would improve the performance of the battery, into a new era.

Conductive coating is good by decentralizing Nano conductive graphite coated particles, etc. It can provide excellent static conductivity. It is a layer of protection energy absorption layer. It can also provide a good cover protection performance. Coating with water and solvent resistance, can be used in aluminum, copper, stainless steel, aluminum and titanium plate.

Coated carbon coating on the performance of lithium-ion batteries with the following promotion

1. Reduce the battery internal resistance, inhibition of charge and discharge cycle in the process of dynamic resistance increase;

2. Improve the consistency of the battery pack decreases the cost of the battery pack;

3. Improve the active material and fluid collection of glue adhesion reduces the pole piece manufacturing cost;

4. Reduce the polarization, improve the rate performance reduce the heating effect;

5. To prevent the electrolyte to set fluid corrosion;

6. The comprehensive factor and prolong the service life of the battery.

7. Coating thickness: conventional single 1 ~ 3 microns thick.

Japan and South Korea in recent years, the main development in modification and nickel cobalt manganese acid lithium manganese acid lithium ternary material as the anode material of power type lithium ion battery, such as Toyota and Panasonic, Hitachi, Panasonic EV energy of a joint venture company, new Kobe motor, NEC, SONY, Sanyo, Samsung, LG, etc. The main development of the anode materials for lithium iron phosphate power type lithium ion battery, such as A123 systems, Valence, but the major automobile manufacturers in the PHEV and EV is the choice of manganese base power type lithium ion battery cathode material system, and it is said that the A123 company in the field of consideration into manganese acid lithium materials, and Germany and other European countries mainly adopt the battery company cooperation with other countries to develop electric vehicles, such as Daimler and French Saft alliance, Volkswagen of Germany and Japan Sanyo cooperation agreement, etc. Currently Volkswagen of Germany and France's Renault Sa with the support of their governments are development and production of power type lithium ion battery.

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