High-charge charging and discharging modeling and charge correction method, system, device and medium
By fitting a model equation relating voltage and charge within a specific SOC range of a lithium battery, the battery charge measured by the BMS is corrected, thus solving the problem of large SOC prediction errors in lithium batteries and achieving more accurate SOC calculation and charge correction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANGHAI MAKESENS ENERGY STORAGE TECH CO LTD
- Filing Date
- 2023-03-23
- Publication Date
- 2026-05-29
AI Technical Summary
In existing technologies, the prediction of the state of charge (SOC) of lithium batteries has large errors, especially in the case of unstable operating conditions of frequency regulation power stations and the problem of ammeter measurement range, which leads to errors in the calculation of charge and discharge capacity, resulting in large SOC calculation errors, and even situations where the cumulative SOC exceeds 100%.
By acquiring current, voltage, and time data of lithium batteries within a specific SOC range, a model equation between voltage and relative remaining capacity is fitted. This model equation is then used to correct the BMS-measured capacity, calculate the actual charge and discharge capacity, and correct the SOC.
It reduces ammeter error and long-term accumulated error of BMS, simplifies the calculation, improves the accuracy of SOC prediction, conforms to battery physical characteristics, and is more targeted than the full-stage correction algorithm.
Smart Images
Figure CN116500443B_ABST