Junction Box Water Mitigation via Drainage Channels
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Solution Overview
Problem
Junction box assemblies in vehicles are prone to electrical short circuits and component damage due to water ingress during inclement weather, particularly when the jump start terminal is exposed, as water can accumulate and reach sensitive components like fuses.
Innovation Solution
A junction box assembly design featuring a water channel system that directs water away from fuses, utilizing a jump start terminal housing with a through hole and a drainage system that includes a first and second drain hole configuration, ensuring water is collected and drained through the assembly without reaching the fuses, thereby preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the jump start terminal is exposed for easy access, then ease of operation is improved, but water ingress risk increases causing electrical short circuits
Solution Approach 1:
The junction box is divided into separate compartments: an exposed jump start terminal housing and an internal fuse housing. This segmentation allows the terminal to remain accessible while isolating sensitive components from water ingress risks.
Solution Approach 2:
A waterproof cover or seal acts as an intermediary between the exposed terminal and the internal fuse housing, allowing electrical functionality while blocking water from reaching sensitive components.
2Reliability
If water drainage channels are added to protect against water ingress, then reliability is improved, but device complexity increases
Solution Approach 1:
Water drainage features are localized to specific areas where water accumulation is most problematic, such as the jump start terminal housing and fuse housing interfaces, rather than implementing a complex system throughout the entire junction box.
Solution Approach 2:
The waterproof cover introduces a new dimensional barrier (the cover itself) between water and sensitive components, adding protection without requiring complex internal channel systems.
3Reliability
If the fuse housing is sealed to prevent water ingress, then reliability is improved, but ease of repair deteriorates
Solution Approach 1:
The fuse housing cover is designed to be removable or openable, transforming from a static sealed structure to a dynamic one that can be opened for maintenance while remaining sealed during normal operation to protect against water ingress.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The water channel system effectively prevents water from reaching sensitive components, maintaining the functionality of the junction box assembly even when exposed to environmental moisture, thus protecting electrical components from damage.
Implementation Method 1
a water channel configured to direct water away from fuses disposed in a bus bar unit
Data Source
AI summary
A junction box assembly includes an upper cover coupled to a lower cover assembly. The upper cover has a jump start terminal housing and a first through hole which accommodates a jump start terminal. The lower cover assembly includes a fuse assembly having an upper case and a lower case configured to hold a bus bar unit having a plurality of fuses. The upper case includes a collar and a first drain hole. The collar defines a second through hole and is concentric to the jump start terminal. The first drain hole is spaced apart from the fuses. The first drain hole is open to a second hole of the bus bar unit. The lower case includes a second drain hole open to the second hole. Accordingly, water is routed through the fuse assembly and away from the fuses so as to retain the functionality of the junction box assembly.