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The 18650 lithium-ion battery is screened before the PACK. Different customers have completely different requirements for the cells before the 18650 lithium-ion battery PACK. Because the 18650 lithium-ion power battery is highly automated, stable and replaceable, it can effectively reduce production costs, save labor, and make the 18650 battery have unparalleled unique advantages in the modularization and standardization of system development. However, everything has its dual nature, and the coexistence of advantages and disadvantages is the normal state of things. In addition to the above advantages, the disadvantages of 18650 lithium-ion battery PACK cannot be ignored. The biggest drawback of the 18650 lithium-ion battery at present is that its single battery capacity is relatively low, generally around 2~4Ah. Therefore, the number of batteries required for electric vehicles is very large. For example, Tesla Motors needs 700008000 18650 lithium-ion batteries to be reliably connected into modules. Therefore, with so many batteries, the consistency of battery management is required higher. In many series-parallel fields such as electric vehicles, the inconsistency of batteries will affect the performance of batteries and even bring some potential safety hazards.

There are many reasons for the inconsistency of the 18650 lithium-ion battery before the PACK. The materials that make up the battery are not completely consistent, and the manufacturing process of the battery cannot be controlled to ensure that each battery is the same in any detail. This will lead to inconsistent capacity, terminal voltage, internal resistance and service life. In addition to screening the electrical performance, the appearance of 18650 lithium-ion battery should also be inspected. For example, the scratches, damages, stains, pits, bumps and other defects on the surface of the battery will affect the assembly of the battery module and the safety characteristics after assembly.

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