Energy Storage SOC Correction for Stable Load-State Display
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Solution Overview
Problem
Conventional energy storage power supplies experience inaccuracies in state of charge (SOC) due to limited battery management system (BMS) collection accuracy, leading to sudden changes when fully charged and used under load, especially in low-temperature environments.
Innovation Solution
A control method that calculates SOC based on load current, load duration, and a speed factor to correct deviations, using a correction duration to stabilize SOC display, reducing sudden jumps and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the energy storage power supply enters sleep state after full charging, then energy consumption is reduced, but SOC measurement precision deteriorates due to limited BMS collection accuracy
Solution Approach 1:
The system performs preliminary calibration of SOC before entering sleep state, and pre-calculates the correction amount based on expected self-discharge characteristics. This allows the BMS to enter low-power mode while still maintaining accurate SOC tracking through pre-computed correction values that are applied upon wake-up.
Solution Approach 2:
The system implements a feedback mechanism where the actual SOC deviation is measured after sleep state, and this information is used to refine the correction algorithm for future sleep periods. The BMS continuously learns from the difference between expected and actual SOC changes, improving measurement precision while maintaining energy efficiency.
2Adaptability or versatility
If the charging gun is unplugged and the power supply is used under load, then operational versatility is improved, but SOC display stability deteriorates due to deviation between displayed and actual SOC
Solution Approach 1:
Before the power supply transitions from charging to load mode, the system performs a preliminary SOC correction by calculating the deviation that occurred during charging. This pre-correction ensures that when the charging gun is unplugged and load mode begins, the displayed SOC is already stable and accurate, preventing sudden jumps during operational transitions.
Solution Approach 2:
The system dynamically adjusts the SOC calculation parameters based on the operational state. When transitioning from charging to load mode, it switches from charging-based SOC estimation to load-based SOC estimation, smoothing the transition and maintaining display stability across different operational modes.
3Device complexity
If the BMS collects consumption data with limited accuracy, then device complexity is reduced, but SOC reflection timeliness deteriorates leading to sudden SOC changes
Solution Approach 1:
The system introduces a correction calculation module that acts as an intermediary between the simple BMS data collection and the final SOC display. This module computes the deviation SOC and applies correction factors to the displayed SOC, bridging the gap between limited measurement capability and timely accurate SOC reflection without adding complex hardware.
Solution Approach 2:
The patent replaces enhanced physical measurement capabilities with a computational correction approach. Instead of upgrading the BMS to have higher precision collection capabilities, it uses algorithmic correction based on measurable parameters like correction duration and deviation SOC to achieve timely and accurate SOC reflection.
Data Source
AI summary
Provided are a control method, a control device, an energy storage power supply, and a storage medium. The control method includes: obtaining a load current and a load duration of the energy storage power supply when the energy storage power supply is disconnected from a charger and is under load; obtaining a correction duration of the energy storage power supply; obtaining a deviation SOC of the energy storage power supply; determining a speed factor based on a ratio of the deviation SOC to the correction duration; and obtaining the first state of charge of the energy storage power supply based on the load current, the speed factor, and the load duration until the load duration reaches the correction duration.