There are many kinds of lithium batteries, such as ternary lithium, lithium manganese, lithium iron phosphate batteries, etc. by raw material system; volume, magnification, high magnification, etc., which are divided by the application area of rechargeable batteries; 1. Low temperature resistant lithium battery; steel case, polymer, square, 18650, 26650, etc., which are divided by appearance, have a complete range, and it is impossible to give examples here. Let us talk about lithium batteries. What are the hazards of pressure difference in lithium batteries?
At present, the lithium batteries used for electric vehicles mainly include ternary lithium batteries and lithium iron phosphate rechargeable batteries, 18650 cylinders and polymer hard packs, but the most popular ones are 18650 cylinders ternary lithium batteries. The working voltage range of the ternary lithium battery is the nominal voltage. The lithium battery is based on the working voltage and capacity requirements of the application, and multiple batteries are connected in series and composed.see more:lifepo4 battery 500ah
For example, if a rechargeable battery with a capacity of 2Ah needs to be assembled into a 36V/10A lithium battery pack, then five of them must be connected in series, and then 10 of them must be connected in series, and a total of 50 18650s are required; lithium batteries are afraid of overcharging and overdischarging Therefore, the lithium battery pack and the external power supply circuit should limit the working voltage of the rechargeable battery up and down according to a maintenance power supply circuit.
The uniformity requirements of various lithium battery packs and lithium battery packs are very high, and the volume, internal resistance, and charging and discharging platform of a set of 18650 lithium battery packs must be the same; but then again, there are no two in the world. Lithium battery packs are exactly the same, so it is impossible to make lithium battery packs the same, and there are certain differences, but the specifications of each lithium battery pack are different, so the quality is also uneven. see more:48V 400ah LiFePO4 Battery Pack
What impact does the pressure difference of the lithium battery have on it? For example, for a 36V battery, for various reasons, one of the strings of batteries has reached the maintenance value when charging, while the battery of the lithium battery protection board is charging The function can be turned off, even if the voltage of the other battery is still unable to fill the volume.
When charging and discharging, the battery with a low volume will first protect the lower limit value of the working voltage. Even if the rechargeable battery has a volume that has not been charged and discharged, the lithium battery protection board will also turn off the charging and discharging function. This is the so-called short board effect! This is We should let everyone know that the pressure difference will lead to the full efficiency of the battery pack, which is mainly reflected in the shortened schedule, power outage during cycling, and insufficient charging.
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