Dynamic SOC Correction Threshold for Energy Storage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for correcting estimated State of Charge (SOC) values in energy storage devices using current integration methods often require frequent full charging, which may not be suitable for all device states, leading to inefficient energy management and increased fuel consumption in vehicle applications.
Innovation Solution
An estimation device with a current measurement unit, estimation unit, and change unit that adjusts the correction process frequency and charge control based on the energy storage device's state, including environmental temperature and capacity retention ratio, to optimize SOC estimation accuracy and reduce unnecessary full charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full charging is performed frequently to correct SOC estimation errors, then SOC estimation accuracy is improved, but fuel consumption increases
Solution Approach 1:
The correction threshold is dynamically adjusted based on the energy storage device's state (temperature, capacity retention ratio, charge/discharge rate). When the device is in states where frequent correction is beneficial (e.g., moderate temperature, good capacity), the threshold is set lower to trigger correction more often. When the device is in states where correction should be minimized (e.g., extreme temperatures, degraded capacity), the threshold is raised to reduce correction frequency, thus resolving the contradiction between accuracy and fuel consumption.
Solution Approach 2:
The system changes the correction threshold parameter according to multiple state parameters including temperature, capacity retention ratio, and charge/discharge rate. This adaptive parameter adjustment allows the system to optimize the balance between SOC estimation accuracy and fuel consumption by triggering corrections only when necessary based on the current device state.
2Measurement precision
If full charging is performed frequently to correct SOC estimation errors, then SOC estimation accuracy is improved, but charge control frequency increases
Solution Approach 1:
The correction threshold is dynamically adjusted based on the energy storage device's state (temperature, capacity retention ratio, charge/discharge rate). When the device is in states where frequent correction is beneficial (e.g., moderate temperature, good capacity), the threshold is set lower to trigger correction more often. When the device is in states where correction should be minimized (e.g., extreme temperatures, degraded capacity), the threshold is raised to reduce correction frequency, thus resolving the contradiction between accuracy and fuel consumption.
Solution Approach 2:
The system changes the correction threshold parameter according to multiple state parameters including temperature, capacity retention ratio, and charge/discharge rate. This adaptive parameter adjustment allows the system to optimize the balance between SOC estimation accuracy and fuel consumption by triggering corrections only when necessary based on the current device state.
3Measurement precision
If correction threshold is set low to improve SOC accuracy, then SOC estimation accuracy is improved, but correction process executes too frequently
Solution Approach 1:
The correction threshold is dynamically adjusted based on the energy storage device's state (temperature, capacity retention ratio, charge/discharge rate). When the device is in states where frequent correction is beneficial (e.g., moderate temperature, good capacity), the threshold is set lower to trigger correction more often. When the device is in states where correction should be minimized (e.g., extreme temperatures, degraded capacity), the threshold is raised to reduce correction frequency, thus resolving the contradiction between accuracy and fuel consumption.
Solution Approach 2:
The system changes the correction threshold parameter according to multiple state parameters including temperature, capacity retention ratio, and charge/discharge rate. This adaptive parameter adjustment allows the system to optimize the balance between SOC estimation accuracy and fuel consumption by triggering corrections only when necessary based on the current device state.
Data Source
AI summary
An estimation device that estimates the SOC of an energy storage device includes a current measurement unit, an estimation unit, and a change unit, in which the estimation unit executes an estimation process for estimating the SOC of the energy storage device by integrating a current measured by the current measurement unit, and a correction process for charging, when a predetermined correction condition is reached, the energy storage device to full charge or the vicinity thereof, and correcting an error in the estimated SOC value, and the change unit changes the correction condition according to a state of the energy storage device.