What does Nickel Hydride No. 5 battery SOC mean? Research on SOC of lithium iron phosphate battery

　　What does Nickel Hydride No. 5 battery SOC mean? Research on SOC of lithium iron phosphate battery. The SOC of a Nickel Hydride No. 5 battery is the remaining power of the battery, also known as the state of charge. Accurate estimation of SOC of lithium iron phosphate batteries is not only the most basic requirement for estimating the cruising range of electric vehicles, but also the basic guarantee for improving battery utilization efficiency and safety performance.

　　What does Nickel Hydride No. 5 battery SOC mean?

　　The main tasks of BMS are to detect battery working conditions, estimate battery SOC, battery health status, and complete functions such as thermal management, charge and discharge control, CAN communication, equalization detection, fault diagnosis, and liquid crystal display. There are various definitions of SOC. Currently, the internationally unified definition is from the perspective of capacity, that is, the state of charge SOC represents the remaining capacity of the lithium iron phosphate battery, which is numerically equal to the ratio of the remaining battery capacity to the rated capacity.

　　The SOC (state of charge) of a Nickel Hydride No. 5 battery is simply how much power is left in the battery; SOC is the most important parameter in the BMS, because everything else is based on SOC, so its accuracy and robustness are extremely important.

　　Without accurate SOC, no matter how many protection functions are added, the BMS will not be able to work properly, because the Nickel Hydride No. 5 battery will always be in a protected state, and the life of the battery will not be extended. The estimation accuracy of SOC is also very important. The higher the accuracy, the higher the cruising range can be for a Nickel Hydride No. 5 battery with the same capacity. Therefore, high-precision SOC estimation can effectively reduce the required cost of lithium batteries.

　　As an important threshold for charging and discharging, SOC plays a role in regulating and protecting Nickel Hydride No. 5 battery packs. From the definition, there are two parameters that directly determine the SOC value, the maximum available capacity of the Nickel Hydride No. 5 battery and the current power. Judging from the parameters used in various algorithms, battery terminal voltage and loop current are the most important measurement parameters.

　　Lithium Iron Phosphate Battery SOC Research

　　With the development of electric vehicles, battery management system BMS has also reached widespread application. In order to give full play to the power performance of the battery system, improve the safety of its use, prevent the battery from overcharging and over-discharging, extend the service life of the battery, optimize driving and improve the performance of electric vehicles, the BMS system must monitor the battery's state of charge That is, SOC is accurately estimated. SOC is an important parameter used to describe the chargeable and dischargeable capacity of lithium iron phosphate batteries during use.

　　Since the SOC of lithium iron phosphate batteries is related to many factors (such as temperature, polarization effect, battery life, etc.) and has strong nonlinearity, to improve the accuracy of SOC estimation, it is necessary to improve the measurement method, battery model and estimation algorithm. Conduct in-depth research on other aspects.

　　Commonly used methods at home and abroad include: discharge test method, ampere-hour method, open circuit voltage method, internal resistance method, Kalman filter method, linear model method and neural network method, etc.

　　The wide voltage platform and severe polarization at both ends of lithium iron phosphate batteries are not conducive to SOC estimation, but the SOC of the battery has an important impact on the inconsistency and life of the battery pack.

　　The cycle life and SOC change patterns of lithium iron phosphate batteries are consistent with expectations. As the SOC decreases, the cycle life increases significantly.

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