V2G Battery Charge Control Using Deterioration Risk Prioritization
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Solution Overview
Problem
The repeated charging and discharging of on-vehicle batteries in electric vehicles participating in vehicle-to-grid (V2G) systems accelerates battery deterioration, reducing their asset value.
Innovation Solution
A charging and discharging management device that acquires and analyzes deterioration acceleration elements such as SOC and temperature information from multiple electric vehicles, assigns priority orders and rates based on these elements, and controls charging and discharging to minimize battery deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charging and discharging operations are increased to meet power demand in V2G systems, then power supply capability is improved, but battery deterioration is accelerated
Solution Approach 1:
The system changes operational parameters by introducing deterioration acceleration element values that quantify battery stress conditions. By monitoring parameters such as charge/discharge rates, temperature, and cycle counts, the system dynamically adjusts charging and discharging operations to maintain power supply capability while keeping deterioration within acceptable limits
Solution Approach 2:
The system implements feedback control by continuously acquiring deterioration acceleration element values from batteries and using this information to adjust subsequent charging and discharging decisions. The management device modifies operational parameters based on real-time battery status, preventing excessive deterioration while maintaining power supply responsiveness
2Adaptability or versatility
If repeated charging and discharging is performed to contribute to power demand, then grid support capability is improved, but battery asset value deteriorates
Solution Approach 1:
The system applies partial action by selectively engaging batteries in grid support operations based on their individual deterioration acceleration element values. Not all batteries are used for V2G operations simultaneously - only those with lower deterioration risk are prioritized, ensuring grid support capability while preserving overall battery fleet capacity
Solution Approach 2:
The system monitors battery capacity loss through deterioration acceleration element tracking and adjusts grid participation parameters accordingly. When deterioration thresholds are approached, the system modifies charging/discharging schedules to prevent excessive capacity loss while maintaining necessary grid support functions
Data Source
AI summary
A charge and discharge management device disclosed herein includes an acquisition controller configured or programmed to acquire information on a predetermined deterioration acceleration element for on-vehicle batteries from a plurality of electric vehicles connected to an electric power system, an arithmetic controller configured or programmed to arithmetically operate deterioration acceleration element values of the plurality of electric vehicles, based on a predetermined arithmetic operation method, based on the information on the deterioration acceleration element, and a determination controller configured or programmed to control charging the plurality of electric vehicles from the electric power system or discharging the electric power system from the plurality of electric vehicles, based on the deterioration acceleration element values of the plurality of electric vehicles.