Power Transfer Model for EV Charging Thermal Control
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Solution Overview
Problem
Existing energy storage systems face issues with excessive power transfer leading to component wear and damage due to high temperatures during charging, particularly in vehicles with rechargeable energy storage systems and auxiliary loads.
Innovation Solution
A method and system for controlling power transfer from a grid to a rechargeable energy storage system and/or auxiliary load using an intermediate power transfer component, where predicted operational information and component data are used to adapt power transfer models to keep the temperature of intermediate power transfer components below their critical limits, thereby reducing wear and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high power transfer is used during charging, then charging speed and productivity are improved, but intermediate power transfer components experience excessive temperature leading to wear and damage
Solution Approach 1:
The patent implements dynamic power transfer control by continuously monitoring temperature of intermediate power transfer components and adjusting power transfer rates in real-time. The control system modifies charging parameters based on thermal conditions, transitioning between different power levels to maintain temperatures below critical thresholds while maximizing charging efficiency when conditions permit.
Solution Approach 2:
The system incorporates temperature sensing and feedback mechanisms that monitor the thermal state of intermediate power transfer components during charging. This feedback information is used by the control system to adjust power transfer rates, creating a closed-loop control that prevents overheating while optimizing charging speed. The feedback ensures that power transfer decisions are based on actual component conditions rather than fixed parameters.
2Reliability
If power transfer is limited to protect components, then component reliability is improved, but charging time and productivity increase
Solution Approach 1:
The system performs preliminary thermal assessment before initiating full power charging by monitoring component temperatures and evaluating thermal capacity. This preliminary action allows the system to determine the maximum safe power transfer rate in advance, enabling optimized charging profiles that prevent overheating while minimizing charging time. The preliminary thermal state evaluation sets the stage for subsequent power transfer decisions.
Solution Approach 2:
The control system implements periodic temperature monitoring and power transfer adjustment during the charging process. Rather than maintaining a fixed power level, the system periodically reassesses thermal conditions and modifies power transfer rates accordingly. This periodic control allows the system to exploit temporary thermal capacity while ensuring long-term component protection, effectively reducing total charging time compared to consistently conservative power limits.
Data Source
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AI summary
The present invention relates to a method for controlling power transfer from a grid to a rechargeable energy storage system, RESS, and/or an auxiliary load of the vehicle, via at least one intermediate power transfer component. The method comprises: - providing predicted operational information of the vehicle, the predicted operational information comprising a connected time period in which the vehicle is connected to the grid, - providing component data comprising power transfer characteristic of the intermediate power transfer component, the component data including at least the critical temperature limit of the intermediate power transfer component, - transferring power from the grid to the RESS and/or from the grid to the auxiliary load of the vehicle according to a power transfer model, such that the temperature of the intermediate power transfer component is kept at least below the critical temperature limit.