What harm will the lithium battery pressure difference cause?

Currently, the lithium batteries used in electric bicycles include ternary lithium batteries and lithium iron phosphate batteries, 18650 cylindrical and polymer soft packs, but the mainstream is 18650 cylindrical ternary lithium. The working voltage range of the ternary lithium battery is 2.5V-4.2V, and the nominal voltage is 3.6V. The lithium battery pack is composed of many batteries in series and parallel according to the use requirements of the voltage capacity. For example, if a single battery with a capacity of 2Ah is to be combined into a 36V/10A battery pack, then 5 should be combined, and then 10 in this way, a total of 50 18650; lithium batteries are very afraid of overcharging and overdischarging, so The battery pack and the external multiple circuit must pass a protection circuit to limit the upper and lower operating voltages of the battery. Strings of multiple batteries require very high battery consistency. The capacity, internal resistance, and discharge platform of a single 18650 battery must be the same; but then again, there will never be two identical leaves in this world. Therefore, it is definitely impossible to make the same battery. We allow a certain gap, but the standards of each manufacturer are different, so the quality is also uneven. How harmful is the consistency of the battery? Take, for example, a 36V battery pack. For various reasons, one of the strings has reached the 4.2V protection value when charging. The protection board's The charging function will be closed, even if the voltage of other batteries is still 3.9V, the capacity cannot be supplemented. When discharging, the lower limit protection voltage value will be reached first when the capacity is low. Even if the battery has a capacity that is not fully discharged, the protection board will also turn off the discharge function. This is the so-called short board effect! So everyone should be able to understand, The pressure difference will cause the overall performance of the battery pack to be exerted. The current stroke of the battery will be shortened, the riding power will be cut off, and the battery will not be fully charged. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the advantages and disadvantages of square lithium batteries? Which is better