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The voltage range of lithium batteries and the hazards of voltage differences in lithium battery packs. Generally speaking, the smaller the pressure difference of a lithium battery pack, the better. The larger the pressure difference, the greater the capacity loss of the lithium battery, but there is generally no danger! The voltage difference between the lithium battery used in mobile phones and the charging voltage is between 0.5 and 0.56V. The voltage of a battery is not constant during constant current charging and discharging.

Lithium battery voltage range

The working voltage of a single lithium battery is 3.7V or 3.2V.

The voltage range of lithium iron phosphate batteries is 2.0 to 3.65V

Lithium cobalt oxide battery, voltage range 2.6 to 4.2V, nominal voltage 3.6V.

The voltage range of lithium-ion batteries is 3.0 to 4.2V, with a nominal voltage of 3.7V.

The voltage range of nickel hydrogen nickel cadmium batteries is 1.0 to 1.4V, with a nominal voltage of 1.2V.

The nominal voltage of a single lithium battery is 3.7V, and the normal voltage range is 2.5V-4.25V. Generally, 3.7V lithium batteries require a "protective plate" for overcharging and discharging. If the battery does not have a protective plate, it can only be charged at a voltage of about 4.2V, because the ideal full charge voltage for lithium batteries is 4.2V. If the voltage exceeds 4.2V, it may damage the battery. Charging with this method requires constant monitoring of the battery's condition.

The charging cut-off voltage of a 3.7V battery is 4.2V, and the discharging cut-off voltage is 3.0V. So, when the open circuit voltage of the battery is below 3.6V, it should be able to charge. It is best to use the 4.2V constant voltage charging mode, so there is no need to pay attention to the charging time. Charging with 5V is prone to overcharging and poses a danger.

The hazards of pressure difference in lithium battery packs

As lithium batteries are an emerging type of battery, many consumers or businesses have little knowledge about them. Therefore, when a lithium battery pack malfunctions during use, the only solution is to replace it, which greatly increases costs for consumers and causes waste of social resources.

For example, in a 36V lithium battery pack, if one of the batteries reaches the 4.2V protection value during charging due to various reasons, the charging function of the protection board will be turned off, even if the voltage of other lithium batteries is still 3.9V and cannot be replenished. When discharging, those with low capacity will first reach the lower limit protection voltage value. Even if the battery has not been fully discharged, the protection board will turn off the discharge function, which is known as the short board effect! In this way, everyone should understand that the pressure difference will cause the overall efficiency of the lithium battery pack to play out, mainly reflected in phenomena such as shorter travel, power outage during cycling, and insufficient charging.

The voltage of a lithium battery pack is one of the important indicators to measure the discharge performance of a lithium battery. It represents the potential difference between the positive and negative terminals of a lithium battery in a certain state, in volts (V). The market positioning and technological means of different lithium battery manufacturers vary, resulting in different discharge platforms and significant differences in quality.

When there is a pressure difference in our beloved car as a consumer, the only thing we can do is to repair the lithium battery pressure difference and restore the battery to its original factory pressure state.

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