What are the dangers of pressure difference in lithuim ion battery 18650?

　　There are many kinds of lithuim ion battery 18650, such as ternary lithium, lithium manganese, lithium iron phosphate batteries, etc. by raw material system; volume, rate, high rate, etc. by rechargeable battery application area; high temperature resistant lithium electronics designed by application area , low-temperature resistant lithium battery; steel shell, polymer, square, 18650, 26650, etc., divided by appearance. There are complete varieties. It is impossible to give examples one by one here, so let’s talk about lithuim ion battery 18650. What are the dangers of pressure difference in lithuim ion battery 18650?

　　At present, the lithuim ion battery 18650 used in electric vehicles mainly include ternary lithuim ion battery 18650 and lithium iron phosphate rechargeable batteries, 18650 cylindrical and polymer hard bags, but the most popular ones are 18650 cylindrical ternary lithuim ion battery 18650. The working voltage range of ternary lithuim ion battery 18650 is the nominal voltage. lithuim ion battery 18650 are composed of several batteries connected in series according to the voltage and capacity requirements during use.

　　For example, if a 2Ah capacity rechargeable battery needs to be assembled into a 36V/10A lithium battery pack, then five of them need to be connected in series, and then 10 of them can be connected in series, a total of 50 18650 batteries are needed; lithuim ion battery 18650 are afraid of overcharge and overdischarge. , so the lithium battery pack and the external power supply circuit must use a maintenance power circuit to limit the upper and lower working voltages of the battery.

　　The uniformity requirements for various lithium battery packs and lithium battery packs are very high. The capacity, internal resistance, and charging and discharging platform of a set of 18650 lithium battery packs need to be the same; but then again, there are no two in the world. Exactly the same lithium battery pack, so it is impossible to make the lithium battery pack the same. Certain differences are allowed, but the specifications of each lithium battery pack are different, so there is also the problem of uneven quality. .

　　What harm does the pressure difference in lithuim ion battery 18650 do to them? For example, for a 36V battery, due to various reasons, one of the batteries in the string has reached the maintenance value while charging, and the charging function of the lithium battery protection board may be turned off, even if the other batteries are charging. The working voltage still cannot carry out capacity replenishment.

　　When charging and discharging, the battery with a low capacity will first maintain the voltage limit value. Even if the battery has capacity that has not been charged or discharged, the battery protection board will also shut down the charging and discharging function. This is the so-called short board effect! This should let everyone know that the pressure difference will cause the overall efficiency of the lithium battery pack to be fully exerted, which is mainly reflected in shortened schedules, power outages while riding, and insufficient battery charging.

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