Battery Switching Circuit With Shared Current Detection Path
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Solution Overview
Problem
Existing vehicle power supply systems face challenges in accurately switching and detecting current flow between batteries in both series and parallel connection states, leading to increased complexity and size when using multiple current sensors.
Innovation Solution
An on-board switching device with a switching circuit, conduction paths, and a current detection unit that allows current detection in both series and parallel states without the need for multiple sensors, using a third conduction path that allows current flow in both states and includes fuses to prevent excessive current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple current sensors are added to detect current in both series and parallel connection states, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The third conduction path is designed to serve dual purposes: it detects current in series connection state and also detects current in parallel connection state. This multi-functional design eliminates the need for separate current sensors for each connection state, thereby reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The patent merges the current detection function into a single third conduction path that handles both series and parallel connection states. By combining what would traditionally require separate sensing mechanisms into one unified path, the system achieves accurate current detection without increasing device complexity.
2Measurement precision
If multiple current sensors are added to detect current in both series and parallel connection states, then measurement precision is improved, but the size of the system increases
Solution Approach 1:
The third conduction path performs multiple functions within a single structural element, enabling current detection in both series and parallel connection states without requiring additional sensors that would increase system volume.
Solution Approach 2:
By merging the detection capability into one shared conduction path, the physical space required for current sensing is minimized, avoiding the need for multiple discrete sensor components that would increase overall system size.
3Adaptability or versatility
If a third conduction path is added to enable current flow in both series and parallel states, then adaptability is improved, but device complexity increases
Solution Approach 1:
The third conduction path is designed as a universal path that adapts to both series and parallel connection states, providing versatility in switching capability while maintaining a relatively simple structural implementation.
Data Source
AI summary
An on-board switching device includes: a switching circuit; a first conduction path through which a current flows in a series connection state and no current flows in a parallel connection state; a second conduction path through which a current flows in the parallel connection state and no current flows in the series connection state; a third conduction path that forms a path between a negative electrode of a first battery and a positive electrode of a second battery in the series connection state and forms a path between both positive electrodes or between both negative electrodes of the first battery and the second battery in the parallel connection state; and a current detection unit that detects a current flowing through the third conduction path.