Dual-Battery Relay Control for EV Battery Swap Communication
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Solution Overview
Problem
Electrically powered vehicles face challenges in maintaining communication with external devices during battery replacement, as existing systems do not ensure continuous connectivity due to power supply disruptions.
Innovation Solution
The vehicle is equipped with a control device that manages two relays and batteries, ensuring the first relay is ON for accessory device communication and the second relay is ON for power converter operation during battery replacement, with automatic adjustments for charge levels and notifications to maintain connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the second relay is turned OFF to replace the second battery, then the battery replacement can be performed, but the communication with external devices is interrupted
Solution Approach 1:
The power supply system is segmented into two independent circuits: the first relay controls power to the accessory device (communication system), while the second relay controls power to the power converter. This segmentation allows the second relay to be turned OFF for battery replacement without affecting the first relay's power supply, thereby maintaining communication continuity during battery replacement operations
Solution Approach 2:
The first battery serves as an intermediary power source that supplies power to the accessory device during battery replacement. When the second battery is being replaced and the second relay is OFF, the first battery maintains power supply through the first relay, acting as a mediator to ensure communication with external devices remains uninterrupted
2Reliability
If the first battery charge level is monitored before battery replacement, then communication during replacement is ensured, but the control system complexity increases
Solution Approach 1:
The control device performs preliminary monitoring of the first battery's charge level before initiating battery replacement. This preliminary action ensures that the first battery has sufficient charge to maintain communication during the replacement process, preventing communication interruptions without requiring complex real-time control systems
Solution Approach 2:
The control device implements a feedback mechanism that monitors the first battery's charge level and uses this information to control the relay operations. The feedback loop ensures that battery replacement only proceeds when the first battery has adequate charge, maintaining communication reliability while using a relatively simple control structure
Data Source
AI summary
An electrically powered vehicle includes: an accessory device capable of communicating with an external device; a power converter that operates a motor; a first relay and a second relay; a control device that controls operation of the first relay and the second relay; a first battery that supplies electric power to the accessory device when the first relay is in ON state; and a second battery that supplies electric power to the power converter when the second relay is in ON state. When the second relay is in ON state and the electrically powered vehicle receives a battery replacement instruction to replace the second battery with a charged battery, the control device controls the first relay into ON state and controls the second relay into OFF state.