EV Power Management Using Battery Temperature and SOC Priority
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Solution Overview
Problem
Existing power management systems for electric vehicles do not effectively regulate the supply and demand of a power grid, leading to excessive power supply on warm days, which can accelerate battery deterioration due to high temperatures and high state of charge conditions.
Innovation Solution
A power management apparatus that selects electric vehicles based on temperature and state of charge (SOC) to issue requests for charging or discharging, prioritizing vehicles that are less likely to deteriorate and using cooling systems to manage temperature, thereby regulating the power grid while minimizing battery wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large number of vehicles simultaneously feed power to the power grid on warm days, then the power grid supply is increased, but the battery deterioration is accelerated due to high temperature and high SOC conditions
Solution Approach 1:
The system changes the selection parameters for power feed vehicles from simple availability to a composite evaluation based on battery temperature and SOC levels. By prioritizing vehicles with lower temperatures and SOCs, the system modifies the operational parameters to reduce battery stress while maintaining power grid supply capability.
Solution Approach 2:
The system performs preliminary assessment of battery conditions (temperature and SOC) before selecting vehicles for power feed. This advance evaluation prevents high-temperature, high-SOC batteries from being selected, thereby preventing deterioration before it occurs rather than reacting after damage happens.
2Use of energy by moving object
If charging requests are issued to all vehicles, then the power grid demand is increased, but the battery deterioration is accelerated in vehicles with high temperature and high SOC
Solution Approach 1:
The system modifies the charging selection criteria by introducing temperature and SOC as key parameters. Vehicles with high temperature and high SOC are deprioritized or excluded from charging requests, while vehicles with lower parameters are selected, thereby increasing power grid demand without compromising battery health.
Solution Approach 2:
The system applies differentiated charging strategies to different vehicles based on their individual battery conditions. Instead of uniform charging requests, each vehicle receives charging decisions tailored to its specific temperature and SOC state, allowing localized optimization of both power demand and battery protection.
Data Source
AI summary
A power management apparatus includes a selector that selects a target number of electrically powered vehicles from a vehicle group including a plurality of electrically powered vehicles and a request processor that can issue to each electrically powered vehicle selected by the selector, a request for at least one of charging of a power storage with electric power from a power grid and power feed to the power grid. The selector obtains a temperature and an SOC of the power storage of each electrically powered vehicle included in the vehicle group and makes selection in accordance with a priority predetermined based on the temperature of the power storage and the SOC of the power storage.