Briefly describe the importance of lithium batteries for industrial vehicle batteries

　　The large-scale application of lithium-ion batteries in new energy vehicles and smart grids is increasing year by year, but the current inconsistency of battery parameters is a key factor affecting the service life of battery packs, although the level of thermal management is improved to some extent. The safe operation of the battery pack is guaranteed, but the level of consistency of the battery is still an important technical factor for the large-scale use of the lithium battery.
　　Lithium battery discharge inconsistency
　　By simulating a 10-string 10-and-battery battery pack, we illustrate the effect of temperature distribution within the battery pack on its performance and cycle life. The lower the average temperature, the higher the temperature unevenness, and the higher the inconsistency of the discharge depth of the single cells in the battery pack; the higher the average temperature, the higher the temperature unevenness, and the shorter the cycle life of the battery pack. It is worth noting that the uneven temperature distribution leads to uneven current distribution between the parallel branches, which deteriorates the uniformity of the aging rate of the single cells.
　　The importance of lithium batteries for electric vehicle batteries
　　Lithium-ion battery consistency refers to the consistency of the initial performance indexes of the individual cells used in the group, including: capacity, impedance, electrical characteristics of the electrodes, electrical connections, temperature characteristics, decay speed, and the like. The inconsistency of the above factors will directly affect the difference in output electrical parameters during operation.
　　The inconsistency of the lithium-ion battery pack or the discrete phenomenon of the battery pack refers to the voltage, charge, capacity, decay rate, internal resistance, and time-varying rate, life, and temperature of the battery pack of the same specification. Impact, self-discharge rate and its rate of change over time.
　　After the single cell is manufactured, there is a certain performance difference. The initial inconsistency is accumulated as the battery continues to charge and discharge cycles during use, resulting in a greater difference in the state of each cell (SOC, voltage, etc.); the use environment within the battery pack is not for each cell. Do the same. This leads to the inconsistency of the single cells being gradually amplified during use, which in some cases accelerates the attenuation of certain single cell performance and causes premature failure of the battery pack.
　　The reason for the inconsistency is divided by chronological order. The inconsistency of the single cells in the battery pack is mainly reflected in two aspects: the technical problems in the manufacturing process and the unevenness of the material, so that the activation degree and thickness of the active material of the battery plate and the micropores There are slight differences in rate, strips, partitions, etc., resulting in inconsistencies in internal structure and materials; electrolyte density, temperature and ventilation conditions, self-discharge degree and charge of each battery in the battery pack when used in loading The effects of differences in the discharge process.