EV Charging Current Adjustment for Battery Thermal Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electric vehicle battery charging methods often shorten battery life by increasing temperature due to high charge currents, which can impact vehicle performance and efficiency.
Innovation Solution
A method for controlling the charging of electric vehicles by determining the desired energy and layover time at a charging station, calculating a suitable charge current to provide the energy within the layover time, and charging the vehicle using this calculated current to minimize temperature rise and extend battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high charge current is used to speed up battery charging, then charging speed is improved, but battery temperature increases which decreases battery life and vehicle performance
Solution Approach 1:
The charging system dynamically adjusts the charge current based on real-time battery temperature measurements and predicted layover time. The control system continuously monitors temperature and modifies charging parameters to maintain optimal charging speed while preventing excessive temperature rise that would harm battery life.
Solution Approach 2:
The system changes the charge current parameter according to the calculated layover time and observed battery temperature response. By adjusting this key parameter, the system optimizes the balance between charging speed and temperature control, extending battery life without significantly compromising charging efficiency.
2Loss of time
If high charge current is used to reduce charging time, then charging time is reduced, but heat dissipation increases which impacts vehicle performance
Solution Approach 1:
The control system performs preliminary calculations of the required charge current based on the predicted layover time before actual charging begins. This preliminary action allows the system to set optimal charging parameters in advance, ensuring that charging is completed within the available time while minimizing heat generation through optimized current selection.
Solution Approach 2:
The system uses high charge current only when necessary and for the minimum required duration to complete charging within the layover time. By calculating the precise current needed and applying it only for the necessary time period, the system rushes through the charging process efficiently while limiting total heat dissipation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach optimizes battery life and vehicle efficiency by reducing heat dissipation during charging, allowing for longer battery performance without sacrificing operational efficiency.
Implementation Method 1
In an electric vehicle, energy may be stored in one or more batteries (located in the electric vehicle) to power the electric motor
Implementation Method 2
The flow of current into the battery during charging increases the temperature of the battery
Data Source
AI summary
A method for charging an electric vehicle at a charging station may include electrically connecting the electric vehicle to the charging station, and determining a desired amount of energy to be provided to the electric vehicle at the charging station. The method may also include determining a layover time of the electric vehicle using a control system associated with the charging station. The layover time may be an amount of time the electric vehicle is expected to be positioned at the charging station. The method may also include calculating a charge current using the control system, wherein the charge current is a value of electric current that is needed to provide the desired amount of energy to the electric vehicle in a time period substantially equal to the layover time. The method may further include charging the electric vehicle using the calculated charge current.