EV Charging Power Control for Full SOC at Departure
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Solution Overview
Problem
Existing electric vehicle charging systems fail to maintain the state of charge (SOC) of batteries at or near 100% at departure, leading to reduced vehicle range and inconvenience due to manual preconditioning and charging initiation, which is prone to human error and inefficiency.
Innovation Solution
A charging management computing device and method that actively manages the charging session by adjusting power based on SOC and consumption, maintaining the SOC below 100% until departure by switching between first and second charging powers, ensuring the battery is fully charged and preconditioned automatically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charging is stopped when SOC reaches 100%, then battery overcharging is prevented, but the battery SOC drops during vehicle startup and preconditioning, reducing vehicle range
Solution Approach 1:
The system performs preliminary charging to 100% SOC before vehicle startup, then maintains charging connection during startup and preconditioning operations. This preliminary action ensures the battery is fully charged before energy consumption begins, eliminating the need to recharge after startup and maximizing vehicle range.
Solution Approach 2:
The charging connection is maintained continuously from initial charging through startup and preconditioning operations. Instead of disconnecting charging at 100% SOC, the system keeps the charging session active throughout the entire vehicle operation sequence, ensuring continuous energy replenishment and maintaining maximum battery charge level.
2Ease of operation
If manual charging initiation is required, then user control is maintained, but human error and inefficiency occur in charging management
Solution Approach 1:
The system enables the vehicle to automatically manage its own charging process by detecting startup conditions and preconditioning needs. The vehicle autonomously initiates and maintains charging sessions without requiring manual user intervention, eliminating human error while preserving user control through configurable charging preferences and departure time inputs.
Solution Approach 2:
The system continuously monitors vehicle state including startup conditions, preconditioning status, and battery SOC levels. Based on this real-time feedback, the charging control automatically adjusts charging power and duration to ensure optimal battery charge management, improving reliability through data-driven decision making.
3Reliability
If charging power is reduced near departure, then battery SOC is maintained below 100%, but charging time increases
Solution Approach 1:
The system dynamically adjusts charging power based on real-time vehicle state and time-to-departure calculations. Instead of using a fixed charging power level, the charging control adapts power delivery to match changing vehicle needs, maximizing charging efficiency while maintaining SOC control throughout the charging session.
Solution Approach 2:
The system changes charging parameters including power level and duration based on detected vehicle conditions and predicted departure time. By calculating optimal charging windows and adjusting power delivery accordingly, the system achieves both SOC control and time efficiency without requiring conservative fixed-power charging.
Data Source
AI summary
A charging management computing device for managing charging of an electric vehicle at a charging point is provided. The charging management computing device includes at least one processor in communication with at least one memory device. The at least one processor is programmed to instruct a charging point to charge an electric vehicle at a first charging power until a state of charge (SOC) of the electric vehicle reaches a threshold SOC, the threshold SOC being less than 100%. The at least one processor is also programmed to reduce a charging power delivered to the electric vehicle from the first charging power to a second charging power, monitor the SOC of the electric vehicle, and maintain the SOC to be below 100% until a time point before a departure time of the electric vehicle from the charging point by adjusting the charging power based on the SOC.