SOC Correction Using Near-Steady-State Battery Model
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Solution Overview
Problem
The existing open circuit voltage method for SOC estimation requires a battery to be left standing for a long time to obtain steady-state OCV, which is impractical in actual use scenarios, reducing its applicability.
Innovation Solution
A method and apparatus that determine a near-steady-state battery model using state data during a short standing time, estimate the steady-state OCV, and correct the current SOC using a correspondence between OCVs and SOCs, allowing for quicker SOC estimation and improved applicability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the open circuit voltage method is used for SOC estimation, then measurement precision is improved, but loss of time increases due to requiring long standing time for steady-state OCV acquisition
Solution Approach 1:
The patent applies partial action by using a shortened standing time period instead of the conventional long standing time. The near-steady-state battery model is designed to work with limited time data, performing SOC correction with partial charging/discharging process data rather than requiring complete steady-state conditions. This reduces the standing time requirement while maintaining acceptable SOC estimation accuracy.
Solution Approach 2:
The patent changes the parameter of standing time from long duration to short duration. By introducing the near-steady-state battery model that can process voltage data from short standing periods, the method transforms the time parameter requirement, enabling SOC correction without requiring the battery to stand for extended periods as in conventional OCV methods.
2Measurement precision
If the battery is left standing for a long time to obtain steady-state OCV, then measurement precision is improved, but productivity decreases due to reduced applicability in actual use scenarios
Solution Approach 1:
The patent applies partial action by using a shortened standing time period instead of the conventional long standing time. The near-steady-state battery model is designed to work with limited time data, performing SOC correction with partial charging/discharging process data rather than requiring complete steady-state conditions. This reduces the standing time requirement while maintaining acceptable SOC estimation accuracy.
Solution Approach 2:
The patent changes the parameter of standing time from long duration to short duration. By introducing the near-steady-state battery model that can process voltage data from short standing periods, the method transforms the time parameter requirement, enabling SOC correction without requiring the battery to stand for extended periods as in conventional OCV methods.
Data Source
AI summary
A method and apparatus for correcting a state of charge (SOC), a battery management system and a storage medium are provided. The method includes: acquiring state data of a battery cell in a case where the battery cell meets a preset standing condition; determining, according to the state data of the battery cell, a near-steady-state battery model for characterizing a change in an open circuit voltage (OCV) over time in a near-steady-state and a steady-state time period threshold for characterizing whether a standing time period is sufficient; processing the steady-state time period threshold by using the near-steady-state battery model to obtain an estimated steady-state OCV value; determining a SOC corresponding to the estimated steady-state OCV value by using a preset correspondence between steady-state OCVs and SOCs; and correcting a current SOC by using the SOC corresponding to the estimated steady-state OCV value.