The inconsistency of lithium-ion batteries can affect the service life of battery packs and reduce their performance. The inconsistency of lithium battery packs refers to the differences in battery capacity, voltage, internal resistance, self discharge rate, and other parameters caused by the combination structure, usage conditions, usage environment, and battery management.
The development of lithium battery technology has always focused on cost control, improving the energy density and power density of lithium batteries, extending their service life, and improving group consistency. The improvement of these elements remains the main problem faced by lithium batteries. The challenge is that the inconsistency of individual batteries is an important factor in battery pack performance, which can reduce the available capacity of the battery pack and shorten its cycle life.
After grouping individual cells, their cycle life will be shortened. Choosing a long-life single battery in the battery pack will increase the number of cycles in the battery pack. However, in order to improve the overall performance of the battery pack and achieve a longer service life, attention should also be paid to the matching consistency of individual batteries and appropriate work should be provided. Adjust and take appropriate thermal management measures, and promptly carry out repairs and maintenance. On the basis of analyzing the causes of inconsistency in lithium-ion battery packs, improvement measures and optimization methods for battery inconsistency are proposed.
Lithium ion battery materials include ternary materials, lithium iron phosphate, lithium cobalt oxide, and lithium manganese oxide, while negative electrode materials include graphite, silicon, and lithium titanate. The consistency of battery performance is crucial for the same batch of raw materials. During the production process, it is necessary to strictly control the particle size distribution, specific surface area, and impurity content of the raw materials to ensure batch consistency.
