It is recommended to use the CCCV charging method to charge lithium iron phosphate batteries, that is, constant current first, then voltage constant. The constant current recommendation is 0.3C. The constant voltage recommendation is 3.65, that is, a current load of 0.3C during the constant current process. When the battery voltage reaches 3.65V, use 3.65V constant voltage charging when the charging current is less than 0.1C (or 0.05C). stop charging, that is, the battery is full.
When charging with a balanced voltage power supply, you should also check the charging current. It is recommended not to charge at too high a voltage, make sure that. the charging current is less than 0.5 C. This will have a negative impact on the battery.
Precautions for using lithium iron phosphate batteries
DiffDifferent battery charging conditions have different aging effects. The more fully charged the battery is, the greater its capacity loss will be. Therefore, for lithium batteries that will be idle, it is recommended that the charge level be 40%.
When you receive the lithium iron phosphate battery and want to use it officially, you need to charge it, because the lithium battery cannot be too full when stored. A battery that is too full will cause significant battery loss. ability. Therefore, lithium battery charging precautions are still very practical when using lithium batteries.
What is the maximum charging current that a lithium-ion battery can accept? I hope the shrimp gives some advice. . .
1. The working current of lithium iron phosphate battery is generally 1C, the maximumis 15C.
2. Charging current is the same as operating current, generally 1C, the maximum is 15C.
3. The general operating voltage of standard lithium iron phosphate batteries is 3.2V; the maximum operating voltage is 3.65V.
Lithium iron phosphate:
Lithium iron phosphate electrode material is mainly used in various lithium-ion batteries. Since the Japanese NTT first revealed the olivine-structured lithium battery cathode material of AyMPO4 (A is an alkali metal, M is a combination of CoFe: LiFeCoPO4) in 1996, John B. Goodenough of the 'Texas State University in the United States in 1997 and others. research groups also subsequently reported the reversible transfer and desorption of lithium characteristics from LiFePO4.
The United States and Japan coincidentally published the structure of olivine (LiMPO4), which has attracted great attention to this material and caused in-depth research and rapid development. Compared with traditional lithium-ion secondary battery cathode materials, LiMn2O4 spinel structure and LiCoO2 layered structure, LiMPO4 has wider sources of raw materials, is cheaper and has no environmental pollution.
Lithium iron phosphate battery:
Lithium iron phosphate battery refers to a lithium ion battery using lithium iron phosphate as the positive electrode material. The cathode materials of lithium ion batteries mainly include lithium cobalt oxide, lithium manganate, lithium nickel oxide, ternary materials, lithium iron phosphate, etc. Among them, lithium cobalt oxide is the cathode material currently used in most lithium-ion batteries.
Lithium batteryThe maximum charging currentthat the battery can accept is usually 1C or even less, for example the maximum charge rate of a ThinkPad laptop battery is 0.9C. The so-called 1C charging rate refers to charging with a current of 1 times the capacity and the charging time is 1 hour.
Actually, if you want a long battery life, you should charge it at 0.1~0.3C for 10~4H. In other words, if a battery with a capacity of 1500 mAh is charged at 0.2 C, the charging current will be 0.2 × 1500 = 300 mA and the battery will charge for 5 hours.
Detailed information:
Lithium-ion batteries still have great potential in fast charging. The main reason for this discrepancy is that Li+ exists in a solvated state in the electrolyte. When it diffuses through the SEI film and is embedded in the graphite, Li+ must first undergo a desolvation process, and this process does notrequires energy consumption, which requires energy consumption. forms an invisible barrier at the SEI/electrolyte interface, preventing rapid diffusion and incorporation of Li+ inside the graphite anode.
The discharge process is just the opposite. The Li+ diffuses into the electrolyte and is solvated without consuming energy. Therefore, the discharge speed of diffusion lithium-ion batteries is much higher than the charging speed.
In order to enable rapid charging of electric vehicles without damaging the electrical performance of lithium-ion batteries, it is necessary to study the maximum acceptable charging current of the power battery. A common consequence of rapid charging with excessive current is the precipitation of lithium metal on the negative electrode. Especially at low temperatures, the dynamic conditions of the graphite negative electrode deteriorate, making it easierthe precipitation of metallic lithium on the surface of the negative electrode. negative graphite electrode.
Reference documents:
Baidu Encyclopedia - lithium battery