Vehicle-to-Grid Battery Management Device for Deterioration Control
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Solution Overview
Problem
The prolonged energizing of secondary batteries in vehicle-to-grid (V2G) systems accelerates battery deterioration, making it challenging to maintain performance and ensure reliable vehicle travel while participating in V2G operations.
Innovation Solution
A management device and method that acquires the remaining performance and use period of secondary batteries, compares it with threshold values, and controls the transfer of electric power between the power system and the battery, restricting or adjusting operations to mitigate deterioration, including frequency regulation control near a lower state of charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electric power is exchanged between the electric power system and the secondary battery in V2G operations, then the utility of the electric power system is improved, but the remaining performance of the secondary battery deteriorates due to prolonged energizing time
Solution Approach 1:
The patent applies dynamics by making the charging/discharging control adaptive and adjustable based on real-time battery performance monitoring. The control device dynamically modifies V2G operation parameters according to the battery's actual state, transitioning from static to dynamic control to resolve the contradiction between system utility and battery performance preservation
Solution Approach 2:
The patent implements feedback mechanisms by monitoring the battery's remaining performance and using this information to adjust subsequent charging/discharging operations. The control device receives performance data, compares it against thresholds, and modifies V2G operations accordingly, creating a closed-loop system that prevents performance degradation while maintaining system utility
2Productivity
If the state of charge of the secondary battery is controlled in a wide range to maximize V2G operations, then the productivity of the electric power system is improved, but the deterioration of the secondary battery is accelerated
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the state of charge range based on the battery's remaining performance. When performance is high, a wider charge range is permitted for maximum productivity. When performance decreases, the charge range is restricted to reduce stress on the battery. This adaptive parameter modification resolves the contradiction between productivity and deterioration prevention
3Stability of the object's composition
If frequency regulation control is performed near the lower limit state of charge to maintain electric power system frequency, then the stability of the electric power system is improved, but the remaining performance of the secondary battery decreases due to increased energizing time
Solution Approach 1:
The patent uses feedback control by monitoring battery performance and adjusting frequency regulation operations accordingly. When battery performance is sufficient, frequency regulation near the lower charge limit is permitted for system stability. When performance degrades, the control device modifies the charge limit threshold, preventing operations that would excessively stress the battery while still maintaining frequency stability
Data Source
AI summary
A management device manages transfer of electric power between an electric power system and a secondary battery that is mounted in a vehicle and stores electric power for travel. The management device includes an acquisition unit configured to acquire remaining performance of the secondary battery and information indicating a use period of the secondary battery, and a control unit configured to acquire two or more threshold values corresponding to period information based on a use period of the secondary battery from reference information in which two or more threshold values are associated with the period information based on the use period of the secondary battery, compare remaining performance of the secondary battery with each of the two or more acquired threshold values, and control transfer of electric power between the electric power system and the secondary battery on the basis of a result of the comparison.