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What is the voltage of lithium iron phosphate batteries and lithium-ion batteries? The upper limit of charging voltage for a single lithium iron phosphate battery is 3.65V. The upper charging limit voltage of lithium iron phosphate batteries is generally 3.7-4V, and the lower discharging limit voltage is 2-2.5V. The voltage of lithium batteries is one of the important indicators to measure the discharge performance of lithium batteries. It represents the potential difference between the positive and negative terminals of lithium batteries in a certain state, in volts.

Voltage of lithium iron phosphate battery

The common 18650 batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. The nominal voltage of lithium-ion batteries is 3.7V, and the charging cutoff voltage is 4.2V. The nominal voltage of lithium iron phosphate batteries is 3.2V, and the charging cutoff voltage is 3.6V. The capacity is usually 1200mAh to 3000mAh, and the common capacity is 2200mAh to 2600mAh.

Why is the voltage of lithium iron phosphate batteries 3.2V?

Lithium iron phosphate battery refers to a lithium-ion battery that uses lithium iron phosphate as the positive electrode material. The positive electrode materials of lithium-ion batteries mainly include lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, ternary materials, lithium iron phosphate, etc. Lithium cobalt oxide is currently the cathode material used by the vast majority of lithium-ion batteries.

The nominal voltage of lithium iron phosphate batteries is 3.2V, the high end charging voltage is 3.6V, and the low end discharging voltage is 2.0V. Due to differences in the quality and process of positive and negative electrode materials and electrolyte materials used by various manufacturers, there may be some differences in their performance.

3.2V is a lithium iron phosphate battery that can discharge large capacity. Nowadays, electric vehicles use this type of battery, which has a long lifespan and is lightweight! 3.6V and 3.7V are both polymer lithium batteries, with a maximum limit of 4.2 and a minimum limit of 2.6. The general standard for polymer lithium batteries is 3.7V.

The charging voltage of lithium iron phosphate batteries should be set at 3.65V, with a nominal voltage of 3.2V. Generally, the maximum charging voltage can be 20% higher than the nominal voltage, but if the voltage is too high, it can easily damage the battery. If the voltage is lower than this indicator, there is no overcharging. If the battery is set to a minimum of 3.0V and needs to be charged, then 3.4V is 0.4V higher than the minimum, and 3.6 is 0.6V higher than the minimum. This 0.2V can release half of the electrical energy, which means that each time the battery is charged, it takes half more time than 3.4V. As the battery is used a certain number of times, this increases its lifespan by half. Therefore, increasing the charging voltage without damaging the battery will increase its lifespan.

The discharge platform of lithium iron phosphate battery is 3.2V

The discharge range value is: 2.5-3.65V

This maximum charging value can be changed according to customer needs (protection board parameters)

Usually, the highest charging voltage is set at 3.85V

When it reaches 3.85V, the protection voltage is reached, and the protection board will automatically cut off the charging circuit to protect the battery.

Lithium ion battery voltage

The discharge platform of lithium-ion batteries refers to the voltage change state of a fully charged lithium battery during discharge. The constant current discharge of a battery undergoes three processes: decrease, stabilization, and further decrease. Among these three processes, the stabilization period is the longest. The longer the stability time, the higher the discharge platform of the battery. The height of the discharge platform is closely related to the battery manufacturing process. Because different lithium battery manufacturers have different market positioning and technological processes, their controlled discharge platforms and quality vary greatly.

Generally, if a 18650 lithium battery has a full voltage of 4.2V and is discharged at 3.7V with a current of 1C for 60 minutes, then we can say that the battery's usage capacity is 2200mAh. The nominal voltage, also known as the rated voltage, refers to the voltage exhibited by a battery during normal operation. The nominal voltage of lithium batteries is generally 3.7V or 3.6V.

The nominal voltage may vary depending on the positive electrode material of lithium batteries. The nominal voltage of lithium cobalt oxide batteries is 3.7V; The nominal voltage of lithium manganese oxide batteries is 3.8V; The nominal voltage of the lithium nickel cobalt manganese ternary material lithium battery is only 3.5-3.6V, but with the continuous improvement of the formula and structure, the nominal voltage of the material lithium battery can reach 3.7V; The nominal voltage of lithium iron phosphate batteries is the lowest, only 3.2V, but this material's lithium battery has excellent safety, will not explode, and its cycling performance is excellent, reaching up to 2000 cycles.

Lithium ion batteries have many advantages, such as high working voltage (three times that of nickel cadmium batteries and hydrogen nickel batteries), high specific energy (up to 165Wh/kg, three times that of hydrogen nickel batteries), small size, light weight, long cycle life, low self discharge rate, no memory effect, and no pollution. Among lithium-ion batteries, lithium iron phosphate batteries are highly favored. Although their specific energy is not as high as lithium cobalt oxide batteries, they have high safety and large individual battery capacity.

The above are the voltages of lithium iron phosphate batteries and lithium-ion batteries. When choosing a lithium battery charger, everyone should pay attention to the output voltage of the charger. The charging mode is constant current+constant voltage.

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