Battery SOC Correction Through Voltage Plateau Traversal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing energy storage systems, such as lithium-ion batteries, face challenges in accurately estimating the state of charge (SOC) in real-time, leading to potential overcharge or overdischarge, and require shutdown for SOC correction, affecting availability and cost.
Innovation Solution
An energy storage system with a battery management unit and power scheduling unit that monitors and corrects the SOC of energy storage units in real-time by identifying units with long running or power-off durations, applying charging or discharging power to depart them from the voltage plateau region, allowing for SOC correction without shutting down the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If ampere-hour accumulation calculation is used to estimate SOC, then the system can continuously operate without shutdown, but the SOC estimation accuracy deteriorates over time due to accumulated sampling deviations
Solution Approach 1:
The patent implements periodic voltage plateau region traversal actions to reset SOC estimation. The power scheduling unit periodically adjusts charging/discharging schedules to drive energy storage units into and out of voltage plateau regions, enabling periodic SOC correction without system shutdown. This periodic intervention prevents continuous accumulation of estimation deviations.
Solution Approach 2:
The patent establishes a feedback mechanism where the battery management unit monitors SOC estimation accuracy and the power scheduling unit receives feedback about units needing correction. Based on this feedback, the system dynamically adjusts power scheduling to traverse voltage plateau regions, creating a closed-loop control that maintains SOC accuracy over time.
2Measurement precision
If the system is shut down to correct SOC, then the SOC accuracy is improved, but the system availability and operational efficiency deteriorate
Solution Approach 1:
The patent enables continuous SOC correction during system operation by utilizing voltage plateau region traversal. The power scheduling unit continuously monitors and adjusts charging/discharging operations to drive units through voltage plateau regions, maintaining SOC accuracy without interrupting system operation. This eliminates the need for shutdown-based correction methods.
Solution Approach 2:
The system performs self-correction of SOC estimation by autonomously identifying units with inaccurate SOC values and automatically adjusting power schedules to traverse voltage plateau regions. The battery management unit and power scheduling unit work together to self-correct SOC accuracy without external intervention or system shutdown, maintaining continuous operational availability.
3Measurement precision
If manual SOC correction is performed, then the SOC accuracy is improved, but the labor cost and operational complexity increase
Solution Approach 1:
The system implements automated SOC correction through the battery management unit and power scheduling unit, which autonomously identify energy storage units requiring correction and generate appropriate power scheduling instructions. This eliminates manual intervention, reducing labor costs and operational complexity while maintaining SOC accuracy.
Solution Approach 2:
The patent establishes automated feedback loops where the battery management unit monitors SOC estimation accuracy, identifies units needing correction, and the power scheduling unit automatically generates and executes correction schedules. This automated feedback-based system replaces complex manual correction procedures with simple, rule-based automated control.
Data Source
AI summary
An energy storage system and a method for correcting a state of charge value thereof. The correction method includes: a battery management unit sends parameter information of each of energy storage units to a power scheduling unit; the power scheduling unit determines, based on accumulated running durations and accumulated power-off durations of the energy storage units, a target energy storage unit requiring correction; the power scheduling unit delivers a power scheduling instruction to the target energy storage unit, to control the target energy storage unit to receive charging power or output discharging power; and the battery management unit monitors a voltage and a state of charge value of target energy storage units; and corrects the state of charge value of the target energy storage unit when the voltage or the state of charge value of the target energy storage unit meets a specified condition.