Electric Vehicle Power Source System with Dual Path Relay Isolation
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Solution Overview
Problem
Conventional electric vehicle power source systems fail to continue operation if a disconnection or ground fault occurs in the power supply path from the high-voltage battery to the drive motor, preventing the vehicle from traveling.
Innovation Solution
A power source system with multiple battery elements, relays, and a detection unit that controls the passage of electric current through separate power supply paths to ensure continued vehicle operation by isolating faulty paths and routing power through unaffected paths, including a separation relay to manage power distribution between connected paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single power supply path is used from the high-voltage battery to the drive motor, then the system structure is simple, but the vehicle cannot continue traveling if an abnormality occurs in the power supply path
Solution Approach 1:
The power supply system is divided into multiple independent power supply paths (first power supply path and second power supply path), each capable of independently supplying power to the drive motor. This segmentation allows the system to maintain operation even if one path experiences an abnormality, thereby improving reliability without significantly increasing overall system complexity.
Solution Approach 2:
The system changes the operational state of relays (on/off states) to switch between different power supply paths based on detected abnormalities. By dynamically changing the parameters of the power supply configuration, the system ensures continuous operation while managing complexity through controlled switching mechanisms.
2Reliability
If multiple power supply paths are provided with relays and detection units, then the vehicle can continue traveling despite abnormalities, but the system complexity increases
Solution Approach 1:
Relays are introduced as intermediary components that control the connection between the high-voltage battery and the drive motor through each power supply path. These intermediaries enable isolated control of each path, allowing the system to maintain power supply continuity by switching to healthy paths while managing complexity through standardized switching mechanisms.
Solution Approach 2:
Detection units continuously monitor the status of each power supply path and provide feedback to the control system. This feedback mechanism enables automatic switching to alternative paths when abnormalities are detected, ensuring power supply continuity while managing system complexity through automated control rather than manual intervention.
3Reliability
If relays are used to control power supply paths, then abnormality isolation is achieved, but the device complexity and potential failure points increase
Solution Approach 1:
The power supply system is divided into multiple independent power supply paths with individual relays controlling each path. This segmentation allows abnormalities to be isolated to specific paths without affecting the entire system, enabling continued operation through healthy paths while managing relay complexity through modular, independent control units.
Data Source
AI summary
The power source system includes high-voltage batteries; a first motor configured to receive power supplied from the high-voltage batteries. A first relay is arranged on a first power supply path. A second motor is configured to receive power supplied from the high-voltage batteries; the second relay that is arranged on a second power supply path. A detection unit detects an abnormality in the first power supply path and the second power supply path. A control unit controls the first relay and the second relay. The detection unit turns off the first relay when an abnormality is detected in the first power supply path, and turns off the second relay when an abnormality is detected in the second power supply path.