Battery energy storage system state assessment method

Abstract

A battery energy storage system state assessment method comprises steps of obtaining operation data of a to-be-assessed battery energy storage system, and performing calculation to obtain real-time radiation conditions of charging state consistency of the to-be-assessed battery energy storage system according to the operation data; obtaining test working condition data of the to-be-assessed battery energy storage system according to a preset period, performing calculation to obtain residual capacity, peak power, polarization voltage, open-circuit voltage, temperature rise performance and charging state estimation condition of the to-be-assessed battery energy storage system according to the test working condition data, and obtaining the decline condition of the to-be-assessed battery energy storage system according to the residual capacity, the peak power, the polarization voltage, the open-circuit voltage, the temperature rise performance and the charging state estimation condition; and obtaining an assessment result of the to-be-assessed battery energy storage system according to the real-time radiation conditions of charging state consistency of the to-be-assessed battery energy storage system and the decline condition of the to-be-assessed battery energy storage system.

Description

technical field [0001] The invention relates to the field of electric energy testing, in particular to a state evaluation method of a battery energy storage system. Background technique [0002] As a branch of high-efficiency and environmental protection in the current energy field, electric energy has been widely used in all walks of life. In the field of electric vehicles, when the battery capacity drops below 80%, it is generally considered that it is no longer suitable for continuous use in electric vehicles. If the battery is used directly, it will cause a waste of resources. The cascade utilization of power batteries is an effective way to reduce the total cost of batteries. With the vigorous development of new energy vehicles in the future, it is estimated that only China's available secondary batteries will reach 50GWh in 2030. [0003] The energy storage system used in grid occasions has relatively mild operating conditions and relatively low requirements on batter...

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Problems solved by technology

[0004] The energy storage power stations in operation are all energy storage power stations integrated with new batteries. Their operation and maintenance technology is not yet mature, and the change law of battery performance parameters is not yet clear. It is impossible to formulate operation and maintenance strategies according to the life curve of the laboratory's characteristic working conditions; The operating parameters of new batteries are generally given by battery manufacturers based on experience; safety requirements are more prominent, new batteries generally pass safety tests, and the probability of a single battery having a safety problem is very small, but cascaded energy storage systems will Returned batteries are reassembled, and its combination performance needs to be verified; there is no standard for cascade utilization of battery energy storage

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