EV Battery Charge Scheduling for V2G Use and Lower SOC Aging
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Solution Overview
Problem
The repeated charging and discharging of on-vehicle batteries in electric vehicles participating in V2G and V2H systems can accelerate battery deterioration, as these batteries are often maintained in high SOC states to meet power demands.
Innovation Solution
A charging and discharging control device that detects the electric vehicle's connection, acquires the battery's SOC, next use time, and next travel distance, and sets a charging and discharging schedule to maintain the battery in a low SOC state, ensuring a necessary SOC for upcoming use while minimizing deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the on-vehicle battery is maintained in a high SOC state to meet power demands in V2G and V2H systems, then the power supply capability is improved, but the battery deterioration is accelerated
Solution Approach 1:
The charging and discharging schedule is dynamically adjusted based on predicted power demands and usage patterns. The battery SOC is flexibly managed to balance power supply needs with deterioration prevention, transitioning between charging, discharging, and maintenance states according to real-time conditions
Solution Approach 2:
The system performs preliminary charging to reach a target SOC before predicted high-demand periods, and proactively maintains the battery in a low SOC state during low-demand periods to reduce deterioration. This advance planning allows the battery to meet power demands without sustained high SOC exposure
2Reliability
If the battery is charged frequently to meet repeated power demands, then the power supply reliability is improved, but the battery lifespan is reduced
Solution Approach 1:
The system implements periodic charging and discharging cycles optimized to minimize battery stress. By controlling the depth and duration of each cycle based on predicted usage patterns, the system maintains power supply reliability while reducing cumulative deterioration from frequent charging operations
Solution Approach 2:
The charging and discharging parameters (current, voltage, duration, SOC range) are continuously adjusted based on battery state and predicted demands. This dynamic parameter optimization reduces harmful charging/discharging cycles while ensuring adequate power supply, thereby extending battery lifespan
Data Source
AI summary
A charging and discharging control device disclosed herein controls a charging and discharging device that charges and discharges an on-vehicle battery mounted on an electric vehicle. The charging and discharging control device includes a detection controller configured or programmed to detect that the electric vehicle has been connected to the charging and discharging device, an SOC acquisition controller configured or programmed to acquire an SOC of the on-vehicle battery, a use information acquisition controller configured or programmed to acquire a next use time and a next travel distance of the electric vehicle, and a setting controller configured or programmed to set a charging and discharging schedule of the on-vehicle battery such that the on-vehicle battery is charged after having been maintained in a low SOC and a necessary SOC for the next use time and the next travel distance remains.