-Why is the consistency of lithium cells so important for power lithium-ion batteries?

Why is the consistency of lithium cells so important for power lithium-ion batteries?
author:enerbyte source:本站 click573 Release date: 2023-02-13 08:57:40
abstract:
At present, the large-scale application of lithium-ion batteries in new energy vehicles, smart grids and other fields is increasing year by year, but at present, the inconsistency of battery parameters is the key factor affecting the service life of the battery pack. Although the improvement o...

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At present, the large-scale application of lithium-ion batteries in new energy vehicles, smart grids and other fields is increasing year by year, but at present, the inconsistency of battery parameters is the key factor affecting the service life of the battery pack. Although the improvement of thermal management level ensures the safe operation of the battery pack to some extent, the improvement of the consistency level of batteries is still an important technical factor affecting the large-scale use of lithium-ion batteries.

Through the simulation of a 10-series 10-parallel battery pack, we clarified the influence of temperature distribution in the battery pack on its performance and cycle life.

The lower the average temperature is, the higher the temperature non-uniformity is, and the higher the non-uniformity of the discharge depth of the single cell in the battery pack is; The higher the average temperature, the higher the temperature non-uniformity and the shorter the cycle life of the battery pack. It is worth noting that uneven temperature distribution will lead to uneven current distribution between parallel branches, which will worsen the consistency of single cell aging rate.

The consistency of lithium-ion battery refers to the consistency of initial performance indicators of single battery used in groups, including capacity, impedance, electrical characteristics of electrodes, electrical connection, temperature characteristics, decay rate, etc. The inconsistency of the above factors will directly affect the difference of output electrical parameters in operation.

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