What is the voltage of the lithium iron phosphate battery and the voltage of the
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2022/08/02 08:44:40
What is the voltage of the lithium iron phosphate battery and the voltage of the lithium ion battery? The maximum charging voltage of a single lithium iron phosphate battery is 3.65V. Generally, the upper limit voltage of lithium iron phosphate battery is 3.7~4V, and the lower limit voltage of discharge is 2~2.5V. The voltage of lithium battery is one of the important indicators to measure the discharge performance of lithium battery. It represents the potential difference between the positive and negative ends of lithium battery in a certain state, unit volt.
Lithium iron phosphate battery voltage
Common 18650 batteries are divided into lithium ion batteries and lithium iron phosphate batteries. The nominal voltage of lithium ion battery is 3.7V and the charging cut-off voltage is 4.2V. The nominal voltage of lithium iron phosphate battery is 3.2V and the charging cut-off voltage is 3.6V. The capacity is usually 1200mah-3000mah and the common capacity is 2200mah-2600mah.
Why is the voltage of lithium iron phosphate battery 3.2V?
Lithium iron phosphate battery refers to lithium ion battery which uses lithium iron phosphate as cathode material. The cathode materials of lithium ion batteries mainly include lithium cobalt acid, lithium manganese acid, lithium nickel acid, ternary materials, lithium iron phosphate and so on. Lithium cobalt acid is the cathode material used in most lithium ion batteries.
The nominal voltage of lithium iron phosphate battery is 3.2V, the high terminating charging voltage is 3.6V, and the low terminating discharging voltage is 2.0V. Due to the different quality and process of anode and cathode materials and electrolyte materials used by various manufacturers, there will be some differences in their performance.
3.2V is lithium iron phosphate battery, which can discharge with a large capacity. Now all electric vehicles use this kind of battery, which has a long life and light weight! 3.6V and 3.7V are the same as lithium polymer batteries. The maximum limit of lithium polymer batteries is 4.2 and the minimum limit is 2.6. The general standard is 3.7V.
The charging voltage of lithium iron phosphate battery should be set at 3.65V, and the nominal voltage is 3.2V. Generally, the maximum charging voltage can be 20% higher than the nominal voltage, but too high voltage is easy to damage the battery. The 3.6V voltage is lower than this index, and there is no overcharge. If the battery is set at the minimum 3.0V, it needs to be charged. If 3.4V is 0.4V higher than the minimum, and 3.6 is 0.6V higher than the minimum, half of the power can be released by 0.2V, which means that the service time of each charge is half longer than that of 3.4V. Since the battery is used a certain number of times, the service life will be increased by half, so without damaging the battery, Increasing the charging voltage will increase the battery life.
The discharge platform of lithium iron phosphate battery is 3.2V
The discharge range is 2.5-3.65V
This maximum charging value can be changed according to customer requirements (protection panel parameters). Generally, the maximum charging voltage is set at 3.85V
When the protection voltage reaches 3.85V, the protection plate will automatically cut off the charging circuit to protect the battery.
Lithium ion battery voltage
The discharge platform of lithium ion battery refers to the voltage change state of a fully charged lithium battery when discharging. Battery constant discharge, battery voltage to go through three processes, namely decline, stability, and then decline, in these three processes, the stability period is the longest. The longer the stabilization time, the higher the discharge platform of the battery. The level of the discharge platform is closely related to the battery manufacturing process. It is because the market positioning of each lithium battery manufacturer is not the same, the technical process means are different, the control of the discharge platform is not the same, the quality is very different.
In general, an 18650 lithium battery with a full voltage of 4.2V is said to have a useful capacity of 2200mAh when it is discharged at a current of 1C to 3.7V for 60 minutes. Nominal voltage, also known as rated voltage, refers to the voltage displayed in the normal working process of the battery. The nominal voltage of lithium battery is generally 3.7V or 3.6V.
The nominal voltage will vary depending on the cathode material of the lithium battery. The nominal voltage of lithium cobalt battery is 3.7V; The nominal voltage of lithium manganese battery is 3.8V; The nominal voltage of lithium battery of lithium nickel-cobalt manganese ternary material is only 3.5-3.6V, but with the continuous improvement of formula and structure, the nominal voltage of lithium battery of this material can reach 3.7V. Lithium iron phosphate battery has the lowest nominal voltage, only 3.2V, but the lithium battery of this material is very safe, it will not explode, and the cycle performance is very good up to 2000 weeks.
Lithium ion battery has the advantages of high voltage (nickel cadmium battery, nickel hydrogen battery 3 times), large specific energy (up to 165Wh/kg, is 3 times of nickel hydrogen battery), small size, light weight, long cycle life, low self-discharge rate, no memory effect, no pollution and many other advantages. In lithium ion batteries, lithium iron phosphate battery is more promising, although this battery energy is less than lithium cobalt acid battery, but its safety is high, single battery capacity is large.
The above is the voltage of lithium iron phosphate battery and lithium ion battery, we should pay attention to the output voltage of charger when choosing lithium battery charger. The charging mode is constant current + constant voltage.
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