Vehicle Battery Storage System with Cross-Isolating Switching for Fault Tolerance
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Solution Overview
Problem
Current vehicle electrical systems lack sufficient redundancy and reliability in power supply, particularly for safety-critical functions, which can lead to system failures during faults or disruptions.
Innovation Solution
A battery storage system with two separate energy storage units and a cross-isolating switching apparatus that allows for redundant power supply through two branches, enabling continued operation of electrical vehicle functions even if one branch fails, and includes semiconductor switching elements for rapid fault isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a redundant on-board electrical system is used to supply power to safety-relevant electrical vehicle functions, then the availability and safety are improved, but the device complexity and cost increase
Solution Approach 1:
The battery storage system is segmented into two separate energy storage units (first and second energy storage units) that can operate independently. Each unit is connected to the respective supply branch, allowing the system to provide redundant power supply while maintaining clear functional separation. This segmentation enables fault isolation without requiring complete system redundancy.
Solution Approach 2:
A cross-isolating switching apparatus is introduced as an intermediary component in the connection line between the two energy storage units. This switching apparatus can interrupt the connection line to isolate faults between the two supply branches, preventing fault propagation while maintaining system operation. The switching apparatus acts as a mediator that enables fault tolerance without requiring full system duplication.
2Reliability
If two separate energy storage units are used in the battery storage system, then the redundancy and reliability are improved, but the weight and volume increase
Solution Approach 1:
The battery storage system is divided into two separate energy storage units that can be independently managed and connected to different supply branches. This segmentation allows for optimized weight distribution and enables the system to achieve redundancy without requiring a single oversized battery unit, potentially reducing overall weight while maintaining reliability.
3Reliability
If a cross-isolating switching apparatus is used to interrupt the connection line, then the fault isolation capability is improved, but the device complexity increases
Solution Approach 1:
The cross-isolating switching apparatus serves as a strategic intermediary component placed at a specific location in the connection line between the two energy storage units. By positioning this switching apparatus at a central point, the system achieves comprehensive fault isolation capability with a single switching component, rather than requiring multiple switching elements distributed throughout the system. This reduces overall complexity while maintaining reliability.
Data Source
AI summary
A battery storage system, for supplying electrical power to at least one electrical vehicle function, which is redundantly connected to the battery storage system by a first supply branch and a second supply branch includes a first connection and a second connection configured to connect to the first and the second supply branches; at least one ground connection; a connection line, which connects the first and the second connections; a cross-isolating switching apparatus arranged in the connection line and configured to interrupt the connection line; a first energy storage unit connected to the connection line between the first connection and the cross-isolating switching apparatus; and a second energy storage unit connected to the connection line between the second connection and the cross-isolating switching apparatus.