SOH calibration method, device, equipment and medium

By monitoring the open circuit voltage and current of the battery and calculating its chargeable and discharge capacity and charge state in the full-charge or full-discharge linear interval, the problem of difficulty in quickly and accurately estimating the SOH of the energy storage system in the prior art is solved, and fast and accurate SOH calibration is achieved.

CN119716615AActive Publication Date: 2025-03-28ZHE JIANG SAI WEI SHU ZI NENG YUAN JI SHU YOU XIAN GONG SI
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Patent Information

Application Number
CN202510214825.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-26
Publication Date
2025-03-28
Estimated Expiration
2045-02-26

AI Technical Summary

Technical Problem

The prior art is difficult to quickly and effectively estimate the SOH of energy storage systems, and is affected by factors such as temperature, DOD, and magnification.

Method used

By monitoring the open circuit voltage and current of the battery, recording the time of the full charge or full discharge linear interval, obtaining the chargeable and discharge capacity, calculating the charge state and the theoretical chargeable and discharge capacity, and finally determining the SOH of the battery is determined by the ratio of the actual charge and discharge amount to the theoretical chargeable and discharge amount.

Benefits of technology

The SOH of the battery is quickly and accurately calibrated, reducing the calculation speed and accuracy of long-term and high-frequency data acquisition.

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Abstract

The invention discloses an SOH calibration method, device, equipment and medium, which are applied to the field of energy storage, and the method comprises the steps: monitoring the open-circuit voltage and current of a battery, recording the current time as the first time when the open-circuit voltage reaches a full-charge linear interval or a full-discharge linear interval, and obtaining the chargeable and dischargeable capacity of the battery at the current temperature; based on the open-circuit voltage corresponding to the first time, determining the current state of charge of the battery; based on the chargeable and dischargeable capacity and the charge state, the theoretical chargeable and dischargeable capacity of the battery is determined; when the open-circuit voltage reaches a full charge state or a full discharge state, recording the current time as second time, and performing time integration on the current of the battery from the first time to the second time to obtain the actual charge and discharge quantity of the battery; and determining the first SOH of the battery according to the actual charge and discharge quantity and the theoretical chargeable and dischargeable quantity. Therefore, the SOH of the current energy storage system can be quickly calibrated.
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