EV Charging Control Device Optimizes Current for Battery Thermal Management
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Solution Overview
Problem
Existing methods for charging electric vehicle batteries at external chargers lack optimization, leading to inefficient charging processes due to high power causing battery overheating and prolonged charging times, especially when targeting high state-of-charge levels.
Innovation Solution
A method that allows users to specify charging constraints such as target state of charge, minimum range, target charging time, and efficiency conditions, enabling the control device to determine and adjust the charging current for optimized charging strategies, including varying charging currents and power levels to minimize thermal effects and power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high charging power is used to charge the energy storage quickly, then charging speed is improved, but battery temperature increases causing charging time to extend due to power reduction
Solution Approach 1:
The control device determines the target state of charge and calculates the optimal charging power before the charging process begins. By pre-calculating the charging strategy based on user constraints and battery parameters, the system avoids the need to reduce power during charging due to temperature rise, thus maintaining high charging speed throughout the process.
Solution Approach 2:
The charging power is dynamically adjusted based on the determined charging strategy that considers battery temperature rise characteristics. The control device continuously monitors charging progress and adjusts power levels to maintain optimal charging conditions, ensuring the battery operates within safe temperature ranges while maximizing charging speed.
2Use of energy by moving object
If maximum charging power is used, then energy transfer rate is improved, but battery thermal stress increases reducing charging efficiency
Solution Approach 1:
The control device changes the charging power parameter based on the determined charging strategy and user constraints. By adjusting the charging power to optimal levels rather than always using maximum power, the system improves charging efficiency while still achieving high energy transfer rates within acceptable time frames.
3Ease of operation
If charging is performed without user constraint input, then ease of operation is improved, but charging process efficiency deteriorates due to lack of optimization
Solution Approach 1:
The control device automatically determines the target state of charge and calculates the optimal charging strategy based on user constraints (such as desired range, time availability, or cost considerations). The system performs self-optimization of the charging process without requiring users to manually configure technical parameters, thus maintaining ease of operation while achieving high charging efficiency through intelligent algorithms.
Data Source
AI summary
A method for electrical charging of an energy storage of a motor vehicle at a motor vehicle external charger, wherein at least one charging constraint specified by a user of the motor vehicle specifically for the upcoming charging process of the energy storage is detected, and a charging current for the upcoming charging process is determined depending on the at least one charging constraint, and the charging process is performed depending on the determined charging current.