What is the significance of the research on equalizing charging of lithium iron phosphate battery pack?

What is the significance of the research on equalizing charging of lithium iron phosphate battery pack? Lithium iron phosphate batteries have a long cycle life and high safety performance. However, the consistency of lithium iron phosphate batteries is always a major technical problem. The consistency of lithium iron phosphate batteries directly affects the service life of the finished product. Under the circumstances, the life of the single lithium iron phosphate battery is 2000-3000 times, and the service life after forming the group is only about 1000 times. The most influential factor is the consistency of the battery. It is still necessary to balance the charging of the lithium iron phosphate battery pack. The rated voltage platform of a single-cell lithium iron phosphate battery is 3.2V. Obviously, a single-cell battery is far from being able to meet the needs of electric vehicles for the voltage level of power lithium batteries. On the other hand, currently produced single-cell lithium iron phosphate batteries have a limited rated capacity. Take the cylindrical lithium iron phosphate battery produced by Waterma as an example. As one of the high-quality suppliers of lithium iron phosphate energy solutions in China, its important single-cell lithium iron phosphate battery has a rated capacity of not more than 10Ah, which is obvious. The capacity of the body battery is far from being able to meet the needs of electric vehicles for the capacity of power lithium batteries. Therefore, lithium iron phosphate batteries are often recommended to be connected in parallel and then in series during use. Lithium iron phosphate battery However, due to the dispersibility of performance parameters in the production process of single cells, the capacity dispersibility between single cells will gradually increase as the number of charging and discharging increases during the parallel and series use of battery packs. , Resulting in a decrease in the performance of the power lithium battery pack and a shortened cycle life [-1, 17-18]. For this reason, it is necessary to charge the power lithium battery pack to reduce the impact of the inconsistency of the single battery, improve the performance of the power lithium battery pack, and extend the driving range of electric vehicles. Overcharging of lithium iron phosphate batteries is one of the most dangerous factors leading to unsafe battery behavior. The overcharge unsafe behavior of lithium-ion batteries is important because of the organic solution electrolyte used. The organic solution electrolyte cannot achieve a reversible process of decomposition and recombination like the water in an aqueous battery, which also leads to a strong response to overcharging. In order to ensure the charging safety of the battery pack, the battery pack needs to be equipped with a dedicated protection circuit for charging management in practical applications, so as to prevent the single battery from overcharging and to extend the service life of the battery pack as much as possible. The single battery management circuit will continue to consume power when connected to both ends of the single battery. Although the battery management system can reduce power consumption by setting a low power consumption mode when it is working or not working, it will still consume power, and the power consumed at this time will be greater than the self-discharge power of the single battery. Regarding electric vehicles that have been left for a long time, even if the electric vehicles are not used, the single battery management circuit is still connected in parallel to the single battery, and the battery will continue to be over-discharged until the discharge is damaged. Therefore, in order to prevent the battery from being damaged by the discharge of the single battery management circuit, a corresponding automatic power-down circuit should be designed. This circuit can automatically disconnect the corresponding single battery management circuit when the battery voltage is lower than the set cut-off voltage. 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 post: Introduction to Ni-MH battery manufacturers and lithium battery manufacturers