Lithium battery voltage knowledge
Lithium battery voltage is one of the important indicators to measure the discharge performance of lithium batteries. It indicates the potential difference between the positive and negative terminals of a lithium battery in a certain state, in volts (V). The nominal voltage, also known as the rated voltage, refers to the voltage that the battery exhibits during normal operation. The nominal voltage of the 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 oxide battery is 3.7V; the nominal voltage of lithium manganese oxide battery is 3.8V; the nominal voltage of lithium nickel cobalt cobalt ternary material is only 3.5-3.6V, but with the continuous improvement of the formula and structure Perfect, the material lithium battery nominal voltage 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, will not explode, the cycle performance is very good can reach 2000 week.
The voltage of a lithium battery is determined by the electrode potential. The voltage, also called the potential difference or potential difference, is a physical quantity that measures the difference in energy produced by the charge in the electrostatic field due to the difference in potential. The electrode potential of lithium ions is about 3V, and the voltage of the lithium battery varies with materials.
For example, a typical lithium battery has a rated voltage of 3.7V and a full-voltage voltage of 4.2V; and a lithium iron phosphate battery has a rated voltage of 3.2V and a full-voltage voltage of 3.65V. In other words, the potential difference between the positive and negative electrodes of a lithium battery in practice cannot exceed 4.2V, which is a requirement based on material and safety of use.
Generally, a 3.7v lithium battery needs to have a "protective board" for overcharging and overdischarging. If the battery has no protective board, it only uses a charging voltage of about 4.2v, because the ideal full charging voltage of the lithium battery is 4.2v, and the voltage exceeds 4.2v. Damage to the battery, use this method to charge while monitoring the condition of the battery.
The above is the introduction of the voltage of lithium iron phosphate battery. Generally speaking, the higher the charge and discharge voltage of a lithium battery, the larger its capacity. The charge and discharge voltages of lithium batteries of different materials are different. The lowest is lithium iron phosphate battery, lithium ion battery of different types of electrode materials, the discharge platform has a big difference, the voltage will be different.