Jan 24, 2019 Pageview:1159
Charging voltage of lithium iron phosphate batteries should be in 3.65 v, and nominal voltage should be 3.2 v. The maximum charge voltage can be higher than 20% of the nominal voltage, but high voltage is easy to damage the battery. 3.6 v voltage is lower than the indicator, and there is no charge. If it will need to set a minimum of 3.0 v, the battery needs charging. 3.4 v is higher than the lowest by 0.4 v. 3.6 V is higher than the lowest by 0.6 v. That 0.2 v can release the power, that is to say every time charging, it has more usage time than that of 3.4 v. Due to the number of battery cycle is certain, its cycle life will increase for two times than before. In the case of no damage to the battery, increasing the charging voltage can increase the battery life.
Lithium iron phosphate, such as 3.6 v rechargeable battery design limits must be based on lithium electricity practical application, can thoroughly activate battery capacity, without damage to the battery, charge number refers to completely charge put cycles for many times, design of 3.4 v, though without charge, but there will be a few don't participate in circulation charge, and most of the participating of cycle number increases to a certain number of times, still performance variation, vicious cycle until you can't use. This is its limitation, the life of a superposition of various harmful inevitable adverse factors, the performance can't maintain the original design parameters are inevitable.
Battery, in our life has been widely used. Believe that all dear friends no one have not seen the battery, the battery in all aspects of life have high status. Whether mobile computer torch or remote control, has a battery inside, measure of battery has already penetrated into every aspect of our lives. But now the battery has not only confined to the ordinary battery, in the form of more and more types of batteries are widely used in our life, let below small make up to introduce the performance of lithium iron phosphate battery and charging method!!!!
Lithium iron phosphate battery charging method
Lithium iron phosphate battery charging method
Lithium rechargeable batteries have been widely used. The lithium iron phosphate batteries due to its unique advantages, use up, too. The lithium iron phosphate battery charger with normal lithium battery is different. The highest end of lithium battery charging voltage is 4.2 v; Lithium iron phosphate battery is 3.65 v (online and some said, the highest can't higher than 3.8 v), now the question is: can you use mobile phone charger (slightly modified) used in lithium iron phosphate battery charging; Or the use of scrap (slightly modified) lithium battery protection board used in lithium iron phosphate battery charging protection.
Series battery current is consistent, then charging, low capacity will be full of, but the overall voltage to charge cut-off voltage, will continue to charge the overcharge, discharge, cyclic number is much, will be damaged, so there is always one of the worst series batteries. Protective plate is not a single charge, but to protect, if without a balanced function, is the worst of protection, the actual overall is not full. Even with balanced protection plate, is also a false balance, through the shunt resistance, the bypass of the battery, to continue with other battery, to achieve the overall effect, because the bypass resistance power is limited, it will make a great general 100 mah, in fact, for the whole battery pack in the ocean. Actually series battery equalization, can say is the world's problems, low cost of large current balance, and the serial number, the greater the equilibrium of the more difficult. It is because of bad series battery overcharge discharge control, and lithium electricity charge discharge damage extremely fast, and security issues, to the development of lithium iron phosphate, lithium iron phosphate capacity is low, the energy is also low, various aspects than lithium electricity, because of its resistance to overcharge too, to be popular.
Ribbon cable is to protect the board don't need a thick line of line, red and black line is the power supply line, after the current big need bold lines. Protective plate is detection of each monomer batteries voltage, discharge, though, both to protect each monomer charging protection but also, otherwise will not be able to discharge or charge by protecting plate, protective.
When charging, is balance pad line row, usually from both ends series overall charge directly, the charger voltage is greater than the battery voltage. The bottom line test of each monomer batteries voltage, equivalent to parallel stabilivolt, monomer charging voltage will not exceed voltage value, while other monomer charging the battery to charge by stabilivolt bypass. Because the power of each monomer is close to full of, just in the balance of each monomer, so the charging current is small, each cell is full of supplementary balance. The charger can only is to protect the voltage of the battery pack, balance pad is to ensure that each monomer of charging is each monomer is full, not because there is a battery full of caused to stop the battery.
Lithium iron phosphate battery charging method
1, some mobile phone charger is to protect itself, when detect the lithium battery voltage is 4.2 v, stop charging. My train of thought is in the lithium iron phosphate batteries and chargers in series between a power slightly larger silicon diode (positive pressure drop is about 0.6 v) when charging, such as lithium iron phosphate battery voltage is 3.6 v, and the pressure drop of the diode is 4.2 v, can also be charger detected, stop charging.
2, mobile phone battery protection circuit, and used in lithium iron phosphate battery charging protection, but also in charging time series according to the principle of the above a diode, the 4.2 v protection.
Lithium iron phosphate battery, it is to point to use as the anode material of lithium iron phosphate 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 been 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 the lithium iron phosphate power battery, cycle life reached 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. All in all, the price performance ratio in theory for lead-acid battery 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 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 as that do not contain 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, and improve the discharge ratio [1]
As the requirement of domestic battery manufacturers of battery performance is increasing day by day, it 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, and 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, decrease the cost of the battery pack;
3. Improve the active material and fluid collection of glue adhesion, and reduce the pole piece manufacturing cost;
4. Reduce the polarization, improve the rate performance, and 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.
In recent years, Japan and South Korea mainly develops in modification 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 EV energy joint venture company, New Kobe Motor, NEC, Hitachi, SONY, Sanyo, Samsung, LG, etc. America mainly develops 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 are 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 gets into manganese acid lithium materials. 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 developing and producing power type lithium ion battery.
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