Lithium battery voltage knowledge, lithium iron phosphate battery voltage range
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2022/08/05 08:56:28
Lithium battery voltage knowledge, lithium iron phosphate battery voltage range. 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 each lithium battery manufacturer, its performance will be somewhat different. 3.2V is lithium iron phosphate battery, can discharge large capacity.
Lithium iron phosphate battery voltage range
Generally, the maximum charging voltage of lithium iron phosphate battery is 3.7~4V, and the minimum discharge voltage is 2~2.5V. Considering the discharge capacity, median discharge voltage, charging time, percentage of constant current capacity and safety, the charging scheme of constant current and constant voltage is adopted. For lithium iron phosphate battery, the charging limit voltage is set at 3.55 ~ 3.70V. The recommended value is 3.60 to 3.65V, and the lower discharge voltage is 2.2V to 2.5V.
The lithium iron phosphate battery has a design 3.6V charge limit, which is designed to fully activate the battery capacity without damaging the battery. The number of charging refers to the number of multiple complete charging and discharging cycles. Although there is no overcharging in the design of 3.4V, a small number of them will not participate in the cyclic charging and discharging, and most of them will continue to deteriorate in performance due to the increase of the cycle number to a certain number, resulting in a vicious cycle until they cannot be used. This is its life limitation, all kinds of inevitable harmful adverse factors superposition, performance can not keep the original design parameters inevitable.
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.
Although the lithium iron phosphate battery has a design limit voltage, it is also equipped with a protection plate to protect the lithium battery from overcharging. But getting the charging method right is also important if lithium batteries are to last longer.
Knowledge of lithium battery voltage
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 (V). 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.
The voltage of a lithium battery is determined by the electrode potential. Voltage, also known as potential difference or potential difference, is a physical quantity that measures the energy difference of charge in electrostatic field due to different electric potential. The electrode potential of lithium ion is about 3V, and the voltage of lithium battery varies with the material.
For example, the rated voltage of the general lithium battery is 3.7V, and the full voltage is 4.2V. The rated voltage of lithium iron phosphate battery is 3.2V, and the full voltage is 3.65V. In other words, the potential difference between the positive and negative terminals of practical lithium batteries cannot exceed 4.2V, which is a material and safety based requirement.
Generally 3.7V lithium battery needs to have overcharge and overdischarge "protection plate", such as battery without protection plate, only with about 4.2V charging voltage, because the ideal full charging voltage of lithium battery is 4.2V, voltage over 4.2V May damage the battery, with this method of charging at the same time need to monitor the condition of the battery.
The above is the introduction of the voltage of lithium iron phosphate battery. Generally speaking, the higher the charging and discharging voltage of lithium battery, the greater its capacity will be. The charging and discharging voltages of lithium batteries of different materials are different. The lowest is lithium iron phosphate battery, different types of electrode materials of lithium ion battery, discharge platform has a big difference, the voltage will be different.
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