Phosphoric acid iron lithium battery management system and system on chip (SOC) calibration method

Abstract

The invention provides a management system and SOC calibration method of a lithium iron phosphate battery, comprising a single battery management unit, a battery pack management unit and a battery system management unit with a three-layer network structure; the single battery management unit manages the lithium iron phosphate battery ;The battery pack management unit manages the single battery management unit, the battery system management unit manages the battery pack management unit, the monitoring system is connected with the battery system management unit and monitors the entire system; the monitoring system is connected with a monitoring dispatching system and an energy storage converter; SOC The calibration method is to cooperate with the monitoring system and the energy storage converter to automatically perform the capacity calibration and SOC calibration of the battery system. Compared with the prior art, the management system and SOC calibration method of the lithium iron phosphate battery provided by the present invention improve the safety and reliability of the lithium iron phosphate battery, effectively prolong its service life, and greatly improve the calibration accuracy of its SOC , to ensure the safety of lithium iron phosphate batteries in large-scale energy storage power stations.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a management system and an SOC calibration method for a lithium iron phosphate battery. Background technique [0002] With the continuous expansion of the development scale of distributed energy and new energy, it is the optimization trend of the energy system to realize the intelligent storage and transmission of electric power through the smart grid. The performance requirements of the energy storage system for the battery are large capacity, long life, fast response, and trickle charging, and the lithium iron phosphate battery has a high energy density ratio and power density ratio, good charge and discharge efficiency and flexible cost. The group method can meet the current large-scale energy storage requirements, and has become the focus of energy storage research. However, the lithium iron phosphate battery itself has obvious nonlinearity, inconsistency and time-var...

AI Technical Summary

Problems solved by technology

However, the lithium iron phosphate battery itself has obvious nonlinearity, inconsistency and time-varying characteristics, which makes it easy to cause serious damage due to the influence of the charge acceptance capacity, self-discharge rate and capacity decay rate of each single battery during the long-term charge and discharge process. The discreteness between groups of batteries increases, performance attenuation intensifies, and serious consequences may even threaten safety

If the lithium iron phosphate battery is not effectively managed, the performance of the battery pack will rapidly decay, and eventually the life of the large-scale battery pack will not be guaranteed.

[0003] At present, due to the large number of lithium iron phosphate batteries and the complex characteristics of series and parallel connections, there is no management system that can effectively manage the safe and controllable operation of lithium iron phosphate batteries at the same time. Integral method, but the accuracy of the traditional SOC calibration method is insufficient, making it impossible to obtain accurate values ​​when estimating the SOC of the battery, which affects the judgment of the safety of lithium iron phosphate batteries

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