The spatial structure and working principle of lithium iron phosphate battery

The spatial structure and reaction principle of lithium iron phosphate batteries have a strong impact on lithium iron phosphate cathode materials, and its relatively wide range of raw material sources, long cycle life, high safety index, and no pollution to the environment. It reflects strong comprehensive performance in many cathode materials. The preparation of anode materials for lithium batteries is a hot topic. In recent years, the development of in-type lithium iron phosphate cathode materials has reached a practical level, and has even begun formal commercial applications. LiFePO4 has an olivine structure. The spatial structure is shown in Figure 1. The theoretical comparison The capacity is 170mahh. When the lithium battery is charged, an oxidation reaction occurs, and the lithium ion FeO6 is released from the layer, flows into the electrolyte, and finally reaches the negative electrode. In the external circuit, when electrons reach the negative electrode at the same time, iron will change from divalent iron ions to trivalent iron ions, leading to an oxidation reaction. The discharging process is opposite to the charging process. Lithium battery protection system (BMS) can improve the consistency of lithium batteries. Power tools powered by lithium batteries are green and environmentally friendly, with good cycle performance, large battery capacity and long service life of the whole machine, which are deeply loved by people. More and more lithium power tools use battery packs in parallel or series to increase the overall capacity of the battery. After a series of series-parallel structures, the consistency of the battery has an important impact on the life and safety of the battery pack. Although the battery pack has been strictly screened for consistency, the capacity, safety and life performance of the series and parallel battery packs cannot be compared with a single battery. At present, battery management systems are widely used in the power tool industry to control the consistency and safety of the batteries in the battery pack, thereby protecting the battery pack and extending the service life of the tool. The consistency of lithium battery processing is recognized as a problem in the industry. Although the relatively consistent batteries are screened by voltage, internal resistance, poor use coefficient method, standard deviation coefficient method and threshold method, after the battery group, the battery in the battery pack It is difficult to maintain consistency, and there are many influencing factors, such as temperature field, battery polarization, self-discharge and so on. Therefore, it is particularly important to control the consistency of the batteries in the battery pack. The battery management system (BMS) can realize the control of the relative consistency of the battery, thereby preventing the overcharge and overdischarge caused by the inconsistency of the battery during the use of the battery, and relatively prolong the service life of the battery pack. The functionally balanced battery management system alleviates the inconsistency of the battery pack to a certain extent, and maximizes the capacity and energy utilization of the battery pack. 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: Type selection of mobile power