EV Battery Management for Reversible Deterioration Recovery
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Solution Overview
Problem
Existing battery management systems for electric vehicles fail to adequately manage battery performance due to irreversible deterioration detection errors, leading to insufficient battery performance as they do not register recovered characteristic values for management.
Innovation Solution
A battery management device that includes a detector and controller to calculate and manage battery performance by determining reversible deterioration based on output values, updating characteristic values when recovery occurs, and managing charging and discharging accordingly to ensure optimal battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the battery management system uses traditional deterioration detection methods, then it can identify battery degradation, but it fails to distinguish reversible deterioration from irreversible deterioration, leading to incorrect management decisions
Solution Approach 1:
The system dynamically adjusts the deterioration determination threshold based on the battery's state of charge (SOC) range. By dividing the SOC range into multiple regions and setting different thresholds for each region, the system adapts to the battery's varying characteristics at different charge levels, enabling accurate distinction between reversible and irreversible deterioration
Solution Approach 2:
The system changes the determination parameters (dQ/dV characteristics and SOC thresholds) based on the battery's operating conditions. By monitoring changes in these parameters across different SOC ranges, the system can identify reversible deterioration patterns and make appropriate management decisions
2Productivity
If the system returns characteristic values to pre-deterioration levels, then battery performance is maximized, but the system may incorrectly manage batteries with irreversible deterioration
Solution Approach 1:
The system dynamically determines whether to return characteristic values based on real-time analysis of dQ/dV characteristics across multiple SOC ranges. When reversible deterioration is detected, the system activates the return function; when irreversible deterioration is detected, it maintains conservative management, ensuring both performance optimization and safety
Solution Approach 2:
The system continuously monitors battery characteristics and provides feedback to adjust management strategies. By comparing current dQ/dV characteristics with historical data across different SOC ranges, the system determines whether deterioration is reversible and adjusts the characteristic values accordingly, creating a closed-loop control system
3Measurement precision
If the system monitors battery characteristics across multiple SOC ranges, then reversible deterioration can be accurately identified, but the complexity of the management system increases
Solution Approach 1:
The system segments the SOC range into multiple regions and analyzes dQ/dV characteristics separately for each segment. This segmentation approach enables precise identification of reversible deterioration by comparing characteristics across different SOC ranges, while the modular structure keeps the implementation manageable
Data Source
AI summary
A battery management device to be mounted on an electric vehicle including a driving wheel, a traveling motor configured to generate a driving force for the driving wheel, and a battery configured to store electric power to be consumed by the traveling motor. The battery management device includes a detector configured to detect a state of the battery, and a controller configured to calculate a characteristic value indicating performance of the battery based on an output of the detector, and manage charging and discharging of the battery based on the characteristic value. The controller is configured to, when the characteristic value has deterioration, determine whether the deterioration of the characteristic value is reversible deterioration based on the output of the detector. The controller is configured to, upon determining that the deterioration of the characteristic value is the reversible deterioration, return the characteristic value to a value before the deterioration.