Motor Vehicle Charging Connection Emergency Disconnection
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Solution Overview
Problem
Existing charging systems for motor vehicles face challenges in safely disconnecting the charging plug during high current charging modes, as quick disconnection is hindered by the risk of electric arcs and mechanical locking systems may fail under fault conditions, requiring complex modifications to ensure voltage and current freedom.
Innovation Solution
A charging connection design that disconnects the signal contact from the signal line using a switching device, allowing for emergency unlocking without additional line connections, ensuring the current line remains free of current during disconnection, utilizing a mechanically or electronically activated switching device to interrupt the signal line, thereby reducing the charging current to zero.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical locking is used to prevent electric arcs during charging, then safety is improved, but quick disconnection capability deteriorates
Solution Approach 1:
The patent divides the locking mechanism into two independent parts: a mechanical locking element for safety and a separate switching device for electrical disconnection. This segmentation allows the mechanical lock to remain engaged for safety while the switching device can be independently activated to disconnect electrical connections, enabling quick disconnection without compromising safety.
Solution Approach 2:
The switching device is configured to disconnect the signal line before the mechanical locking element is disengaged. This preliminary action ensures that electrical connections are severed prior to mechanical separation, preventing electric arcs during the disconnection process while still allowing quick removal of the charging plug.
2Ease of operation
If emergency unlocking is provided to enable quick disconnection, then ease of operation is improved, but reliability under fault conditions deteriorates
Solution Approach 1:
The switching device acts as an intermediary between the emergency unlocking mechanism and the electrical connections. When emergency unlocking is activated, the switching device mediates by first disconnecting the signal line, ensuring electrical safety before the mechanical lock is disengaged. This intermediary function maintains reliability even when emergency unlocking is activated under fault conditions.
3Measurement precision
If additional line connections are added to detect actuation status, then measurement precision is improved, but device complexity deteriorates
Solution Approach 1:
The switching device utilizes the existing signal line to detect its own actuation status. When the switching device disconnects the signal line, the change in electrical continuity of the same signal line serves as the detection mechanism. This self-service approach eliminates the need for separate detection lines, maintaining measurement precision while avoiding increased device complexity.
Data Source
AI summary
A charging connection for a motor vehicle for connecting the motor vehicle to a connection element of a motor vehicle-side charging device in order to charge a motor vehicle-side energy storage device by the charging device. The charging device is provided with at least one current line for a current contact which is connected to the charging current, and with at least one signal line for communication between the motor vehicle and the signal contact connected to the charging device. The charging device is provided with a switching device which disconnects the signal contact from the signal line upon an actuation of the switching device.