Nowadays, the key points of lithium battery for electric vehicles include ternary lithium battery and lithium iron phosphate battery, rechargeable battery, 18650 cylinder and polymer hard package, but 18650 cylinder ternary lithium is popular. The operating voltage area of ternary lithium battery is the nominal voltage. Lithium battery is composed of several batteries in series according to the operating voltage volume during application.
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For example, if it is necessary to assemble a rechargeable battery with a volume of 2ah into a 36V / 10A lithium battery pack, then it is necessary to combine five batteries, and then connect 10 batteries in series, a total of 50 18650 batteries are necessary; Lithium battery is afraid of overcharge and discharge, so the lithium battery pack and external power supply circuit shall limit the required operating voltage for up and down operation of rechargeable battery according to a maintenance power supply circuit.
The uniformity of various lithium battery packs and lithium battery packs is very high. The volume, internal resistance and charge discharge service platform of a 18650 lithium battery pack need to be the same; But then again, we can't find two identical lithium battery packs in the world. Therefore, it must be impossible for lithium battery packs to be the same. There are certain differences, but the standards of each lithium battery pack are different, so there are problems of uneven quality.