What’s mean for consistency performance for lithium battery pack
January 22, 2019
What’s mean for consistency performance for lithium battery pack
After the single cell is manufactured, due to the process problem, the internal structure and material are not completely consistent, and there is a certain performance difference.
The initial inconsistency is accumulated along with the continuous charge and discharge cycle of the battery during use, and the use environment in the battery pack is not the same for each single cell, resulting in a greater difference in the state of each cell. Gradually magnifying during use, in some cases, accelerates the attenuation of certain single cell performance and eventually causes premature failure of the battery pack.
It should be pointed out that the performance of the power battery pack is determined by the performance of the battery cells, but it is by no means a simple accumulation of the performance of the battery cells. Due to the inconsistent performance of the single cells, when the power battery pack is repeatedly used on an electric vehicle, various problems occur and the life is shortened.
In addition to requiring strict control of the process and consistency of the cells in the production and assembly process, the industry generally uses a battery management system with equalization function to control the consistency of the battery in the battery pack to extend the product. Service life.