What is the nominal voltage of lithium battery? What is the appropriate voltage of Li-ion battery for new energy vehicles? Lithium battery pack voltage is one of the important indicators to measure the discharge performance of lithium battery, it indicates the potential difference between the positive and negative terminals of the lithium battery in a certain state, the unit of volts (V). When charging and discharging Li-ion batteries, the voltage is used as a criterion for differentiation. High and low voltage indicates that the battery has been overcharged or overdischarged, both cases are detrimental to the battery life. This article explains the nominal voltage of lithium batteries and how much voltage is appropriate for new energy vehicles lithium batteries?
What is the nominal voltage of lithium battery?
Lithium battery is fully charged will probably know 4.2V or 4.3V; lithium battery discharge will probably be 3.0V. lithium discharge graph is parabolic, 4.3V down to 3.7V and 3.7V down to 3.0V are changing quickly, but about 3.7V is the longest discharge time, almost 3/4 of the time, so the nominal voltage of lithium battery is 3.7V.
Lithium battery pack voltage is determined by the electrode potential range is generally 3V-4.2V, the electrode potential of lithium ion is about 3V, the voltage of lithium battery varies with the material. For example, the general lithium battery rated voltage is 3.7V, the full voltage is 4.2V; while lithium iron phosphate battery rated voltage is 3.2V, the full voltage is 3.65V. The potential difference between the positive and negative electrodes of lithium batteries in practice can not exceed 4.2V, which is a need based on the material and the safety of use.
Depending on the material of the positive electrode of the lithium battery pack, the nominal voltage will be different. Lithium cobalt acid battery nominal voltage of 3.7V; lithium manganese acid battery nominal voltage of 3.8V; lithium nickel cobalt manganese ternary material lithium battery nominal voltage of only 3.5-3.6V, but with the continuous improvement of the formula and structural perfection, the material lithium battery nominal voltage of up to 3.7V; lithium iron phosphate battery nominal voltage of the lowest, only 3.2V.
New energy car lithium battery voltage how much appropriate?
Nominal voltage nominal voltage, also known as rated voltage, refers to the voltage of the battery should be achieved when working under the standard conditions. The nominal voltage is determined by the electrode potential of the electrode plate material and the concentration of the internal electrolyte. The nominal voltage of lead-acid battery is 2V, the nominal voltage of nickel metal hydride battery is 1.2V, the nominal voltage of lithium iron phosphate ion battery is 3.2V, and the nominal voltage of lithium manganate ion battery is 3.7V.
Lithium batteries (including batteries, and other rechargeable batteries) discharge voltage to 0.9 times the nominal voltage is considered to be discharged, although there is still "remaining power" but can not continue to use, otherwise it will damage the battery. The voltage at which the battery is fully charged is called the "termination charge voltage" in the industry, which is about 1.2 times the rated voltage according to the battery industry standard. Such as 3.6V cell phone battery, the termination charging voltage is 4.2 ~ 4.3V.
Nowadays, lithium batteries are widely used, and our smartphones, which are commonly used, are lithium batteries. Generally speaking, in ordinary electronic products, the service life of lithium batteries is between 5-20 years, in terms of the average, in about 8 years. However, as far as the current technology is concerned, new energy vehicles equipped with lithium battery pack, the life of the use of the general is between 3-5 years.
The above is the nominal voltage of the lithium battery and the voltage of the new energy vehicle lithium battery. The service life of lithium batteries (the number of cycles) and the type of battery, the usual charging and discharging habits have a great relationship, usually in the use of the process should also pay attention to maintenance, but also for the recycling of power batteries, but also need to attract sufficient attention to the relevant departments.
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