Battery Case Water Sensor Layout for Early Intrusion Detection
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Solution Overview
Problem
Existing high-voltage apparatuses in vehicles, such as electric automobiles, face challenges in quickly detecting water entry, which can lead to damage like short circuits due to delayed detection.
Innovation Solution
A high-voltage apparatus with a liquid detection sensor positioned adjacent to the case wall section below the opening, surrounded by a shock-absorbing member, and potentially within a liquid reservoir, allowing for early detection of water entry and minimizing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the liquid detection sensor is positioned in the conventional location (not adjacent to the wall section), then the device complexity is reduced, but the detection speed of water entry is delayed
Solution Approach 1:
The liquid detection sensor is positioned in advance at a location adjacent to the wall section below the opening section, so that water entry can be detected as soon as it occurs through the opening, rather than waiting for water to reach the sensor's original position. This preliminary positioning enables immediate detection of water intrusion.
2Reliability
If the liquid detection sensor is positioned below the opening section, then the detection capability for liquid stored in the lower section is improved, but the risk of sensor damage from direct contact with installation surfaces increases
Solution Approach 1:
The sensor positioning is optimized to be adjacent to the wall section rather than directly above the lowest point, creating a localized detection zone that monitors liquid accumulation without requiring the sensor to be in the most vulnerable position. This maintains detection effectiveness while reducing exposure to damage risks.
3Strength
If the shock absorbing member extends further than the liquid detection sensor, then the protection against impact loads is improved, but the device complexity increases
Solution Approach 1:
The shock absorbing member is configured to extend beyond the liquid detection sensor toward the wall section, creating a protective barrier that absorbs impact loads before they can reach and damage the sensor. This beforehand cushioning ensures the sensor is protected from potential impacts during vehicle operation.
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 solution enables rapid detection of water entry, preventing damage to the battery unit by positioning the sensor to detect water before it reaches critical components and absorbing impact loads, thus reducing the risk of short circuits and ensuring stable operation during water exposure.
Implementation Method 1
a liquid detection sensor that is disposed at a portion located adjacent to the wall section below the opening section inside the case and that is configured to detect liquid that has entered the case
Implementation Method 2
a shock absorbing member extending toward the wall section further than the liquid detection sensor may be provided on the battery unit
Data Source
AI summary
A high-voltage apparatus includes a battery unit, a case that includes a circumferential wall section in which a cable insertion port that opens sideways is formed and that is configured to accommodate the battery unit, and a water detection sensor that is disposed at a portion located adjacent to the circumferential wall section below the cable insertion port inside the case and that is configured to detect water that has entered the case.