What are the important consistency characteristic parameters of lithium power lithium ion battery cells in their life cycle?

1) Capacity consistency. According to the current life-span standard of lithium-power lithium-ion battery cells, the available capacity and lifespan of lithium-power lithium-ion battery cells are closely linked. Lithium-power lithium-ion battery cell capacity, as an important parameter for the primary selection of lithium-power lithium-ion battery cell groupings, is one of the most important parameters for the inconsistency of lithium-power lithium-ion battery cells. There are many reasons for the inconsistency of the battery cell capacity of lithium-powered lithium-ion batteries, and most of them are the reasons for the manufacturing process. The lithium-power lithium-ion battery module composed of lithium-power lithium-ion battery cells has a capacity in accordance with the barrel principle, that is, the capacity of the worst lithium-power lithium-ion battery cell determines the entire lithium-power lithium-ion battery module Charge and discharge capacity and life. Power lithium-ion batteries also follow the barrel principle 2) Voltage consistency. After the lithium-power lithium-ion battery cell is formed, it undergoes the same charging and discharging process and is allowed to stand for sufficient time. At the same ambient temperature, when the lithium-power lithium-ion battery cell is charged to the same SOC, measure its open circuit voltage. The voltage difference reflected at the time is the voltage inconsistency of the lithium-ion battery cells. During the charging and discharging process of lithium-powered lithium-ion batteries, the voltage value is a comprehensive reflection of the thermodynamics and dynamics of the lithium-powered lithium-ion battery. It is not only affected by the process conditions of each process in the lithium-powered lithium-ion battery processing, but also Due to the influence of current, temperature, time and accidental factors during the charging and discharging process of lithium-ion battery, the voltage value of each lithium-power lithium-ion battery cell in the lithium-power lithium-ion battery module cannot be exactly the same. The open circuit voltage of lithium-ion battery cells conforms to a normal distribution, that is, all efforts to improve consistency can only change the degree of aggregation of parameters. 3) Consistency of internal resistance. The internal resistance of lithium-power lithium-ion battery cells is an important characterization of its power characteristics, and it is also one of the reasons for the further discretization of cell performance parameters after lithium-power lithium-ion battery cells are grouped. The inconsistent internal resistance of lithium-power lithium-ion battery cells can cause inconsistent temperature rise, which is the reason for further discretization of other parameters. Lithium-powered lithium-ion battery cells with different internal resistances generate more heat when the same current flows through the lithium-powered lithium-ion battery cells with large internal resistance. The temperature of the lithium-power lithium-ion battery cell rises, causing the deterioration rate of the lithium-power lithium-ion battery cell to accelerate, resulting in a further increase in internal resistance, forming a negative feedback, and accelerating the degradation of the high internal resistance lithium-ion battery cell . 4) Lifetime consistency. Another meaning of the life consistency of lithium-power lithium-ion battery cells is that the failure time of lithium-power lithium-ion batteries is consistent. There are research claims, and it is not necessarily the lithium-power lithium-ion battery cell with the smallest capacity or Lithium-powered lithium-ion battery cells with the worst working conditions have reached the end of their life first. Each lithium-powered lithium-ion battery cell starts from the factory, and its anti-aging ability is different. The life of the lithium-power lithium-ion battery module is determined by the lithium-power lithium-ion battery cell with the shortest lifespan. In the lithium-power lithium-ion battery module, the lithium-power lithium-ion battery cell with a small capacity is always used every time. Overflowing, leading to the first to reach the end of life. Regarding the lithium-powered lithium-ion battery module, a lithium-powered lithium-ion battery cell ends in its life, and the lithium-powered lithium-ion battery module will also die. 5) Consistency of temperature characteristics. In addition to the internal resistance factors that directly affect the heating of the lithium-powered lithium-ion battery cells, the inconsistencies formed in the manufacturing process of the internal electrochemical substances will also affect the heating. Each lithium-powered lithium-ion battery cell is located at a different position in the lithium-powered lithium-ion battery module, resulting in differences in its heat dissipation conditions, and ultimately will lead to inconsistent temperature rises of the lithium-powered lithium-ion battery cells. The temperature distribution in the lithium power lithium ion battery module has an impact on its performance and cycle life. The lower the uniform temperature, the higher the temperature unevenness. The lithium power lithium ion battery cell in the lithium power lithium ion battery module The higher the inconsistency of the depth of discharge. The higher the uniform temperature, the higher the temperature unevenness, and the shorter the cycle life of the lithium-power lithium-ion battery module. It is worth noting that uneven temperature distribution will cause uneven current distribution between parallel branches, which will deteriorate the consistency of the aging rate of lithium-ion battery cells. Disclaimer: Some pictures and content of articles published on this site are from the Internet, if there is any infringement, please contact to delete. Previous: Detailed explanation of the principle of polymer lithium battery