Battery SOC Correction Using Interval-Based Tolerance Ranges
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Solution Overview
Problem
Existing methods for estimating battery state of charge (SOC) suffer from estimation errors in different intervals, leading to jumps in SOC during full charge or discharge, which are not adequately addressed by current correction techniques.
Innovation Solution
A method that determines a target tolerance range for battery SOC based on real-time electric quantity characteristic parameters, adjusting the range according to the battery's operating state, including open circuit voltage and standing duration, to correct the detected SOC and ensure it falls within an accurate error range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional SOC estimation methods (Kalman filter, ampere-hour integration, open circuit voltage) are used, then SOC can be estimated, but estimation errors occur in different SOC intervals leading to SOC jumps during full charge or discharge
Solution Approach 1:
The patent divides the SOC range into multiple intervals (e.g., 0-20%, 20-80%, 80-100%) and applies different correction strategies for each interval. This segmentation allows the system to address estimation errors specific to each SOC range, preventing the jumps that occur when using a single uniform correction method across all SOC levels.
Solution Approach 2:
The patent implements local quality by applying different correction tolerances and methods to different SOC intervals. For example, tighter correction tolerances are applied in mid-SOC ranges where estimation is more reliable, while different strategies are used near full charge or discharge where estimation errors are more pronounced. This localized approach improves overall accuracy without causing instability.
2Adaptability or versatility
If a fixed tolerance range is used for SOC correction, then the correction process is simple, but it cannot adapt to different SOC intervals and operating conditions
Solution Approach 1:
The patent implements dynamic correction ranges that automatically adjust based on the current SOC interval and operating conditions. The correction tolerance is not fixed but dynamically determined by the system based on real-time battery state, allowing adaptability to different SOC intervals while maintaining a unified correction framework that does not excessively increase system complexity.
Solution Approach 2:
The system uses feedback from the battery's real-time state (SOC level, charge/discharge status) to automatically adjust the correction parameters. This feedback mechanism enables the system to adapt to different operating conditions without requiring complex manual configuration or multiple separate correction systems.
Data Source
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AI summary
The present disclosure discloses a method for correcting a battery state of charge, a battery management system, a storage medium, a power distribution box, a battery pack and an electric energy device. The method for correcting a battery state of charge includes: a target tolerance range of a battery state of charge is determined based on a preset interval that a real-time electric quantity characteristic parameter of a battery falls. Target tolerance ranges corresponding to any adjacent preset intervals are different. A current detected battery state of charge is corrected based on the target tolerance range. The method and system according to the present disclosure can improve estimation accuracy of the battery state of charge, thereby greatly avoiding the jump of the battery state of charge, and helping to more accurately monitor and manage the battery state of charge.