V2V Charging Cable Power Negotiation for EV Compatibility
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Solution Overview
Problem
Conventional electric vehicle-to-vehicle (V2V) charging systems face compatibility issues due to fixed power levels and incompatibilities between different electric vehicle models, leading to inefficient charging and potential over-current protection, especially when the capabilities of the EVSE and V2L charging devices do not align with individual electric vehicles' requirements.
Innovation Solution
An automatic power negotiation system and cable that adjusts power settings dynamically through a control box, using binary search or incremental adjustments to determine the maximum power setting compatible with both donor and receiver vehicles, ensuring safe and efficient charging without the need for multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed power levels are used in V2V charging systems, then device complexity is reduced, but compatibility between different electric vehicle models deteriorates
Solution Approach 1:
The charging cable system dynamically adjusts power settings through automatic negotiation between donor and receiver vehicles. The control box continuously monitors vehicle capabilities and modifies charging parameters in real-time, transforming a static fixed-power system into a dynamic adaptive system that resolves the contradiction between simplicity and compatibility.
Solution Approach 2:
The system changes power parameters (voltage, current, power level) automatically during charging based on vehicle-specific requirements. The control box negotiates and adjusts these parameters to match both donor vehicle capabilities and receiver vehicle needs, enabling universal compatibility without requiring multiple specialized charging devices.
2Adaptability or versatility
If automatic power negotiation is implemented, then compatibility between different EV models is improved, but device complexity increases
Solution Approach 1:
The control box serves as an intermediary device that manages the complex negotiation process between donor and receiver vehicles. By centralizing the intelligence in a single component rather than requiring sophisticated systems in both vehicles, the solution achieves high compatibility while limiting overall system complexity.
Solution Approach 2:
The charging system performs self-configuration through automatic power negotiation without requiring user intervention or manual setup. The control box autonomously determines optimal charging parameters by communicating with both vehicles, eliminating the need for complex user interfaces or manual compatibility checks.
3Productivity
If power settings are not optimized, then charging speed is maintained, but safety deteriorates due to over-current protection risks
Solution Approach 1:
The control box implements continuous feedback monitoring of charging conditions, vehicle capabilities, and power transfer status. By constantly measuring actual charging parameters and comparing them against safe operating limits, the system adjusts power delivery in real-time to maintain both high charging speed and safety, preventing over-current conditions while maximizing productivity.
Data Source
AI summary
A method for automatic power negotiation for electric vehicle-to-vehicle charge transfer, includes connecting a donor electric vehicle to a receiver electric vehicle via a charging cable of a charging cable system and receiving from a control box of the charging cable system, an initial power setting for the donor electric vehicle. The method also includes determining if the initial power setting has a non-zero value and if the initial power setting has a non-zero value, determining if the initial power setting is acceptable by the donor electric vehicle. The method further includes if the initial power setting is acceptable by the donor electric vehicle, repeatedly increasing the initial power setting to a higher power setting until a maximum power setting is determined and transferring an electric charge from the donor electric vehicle to the receiver electric vehicle along the charging cable based on the maximum power setting.