Battery Housing Underbody Capacitance Sensing for Damage Detection
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Solution Overview
Problem
Existing battery system housings lack effective methods for detecting damage to their underbody structures, leading to potential dielectric breakdown, fires, or explosions, especially after collisions or material fatigue, requiring cumbersome replacement of entire systems.
Innovation Solution
A housing with an underbody structure featuring electrically conductive upper and lower portions forming a capacitor, integrated with a resonant circuit that detects changes in capacitance by monitoring current at resonance frequency, allowing for damage assessment and preventive maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing underbody structure is made robust to prevent damage, then reliability is improved, but weight and material usage increase
Solution Approach 1:
The patent implements a detection system that performs preliminary monitoring of the underbody structure's integrity through capacitance measurements. By detecting damages early before they compromise safety, the system allows for timely maintenance rather than requiring excessive preventive reinforcement, thus optimizing the balance between reliability and weight.
Solution Approach 2:
The patent replaces purely mechanical reinforcement approaches with an electrostatic detection system. Instead of adding more mechanical strength to prevent all possible damages, the system uses electrical field-based capacitance sensing to monitor structural integrity, substituting mechanical prevention with intelligent detection and monitoring.
2Reliability
If the entire battery system is replaced after housing damage, then reliability is restored, but loss of time and productivity decrease
Solution Approach 1:
The patent segments the battery system into modular components with the housing as a separate replaceable unit. The detection system identifies when the underbody structure is damaged, allowing only the housing to be replaced rather than the entire battery system. This segmentation enables targeted repairs that restore reliability while minimizing downtime and maintaining productivity.
Solution Approach 2:
The detection system performs preliminary assessment of housing integrity through capacitance monitoring. By detecting damages early and alerting operators before they compromise system safety, the system enables planned maintenance during convenient downtime rather than forcing unexpected system replacements, thus reducing overall loss of time and productivity.
3Measurement precision
If the housing structure is made more complex to enable damage detection, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by using the existing conductive housing structure for both its primary structural/support function and as an active sensing element for damage detection. The same upper and lower conductive portions that provide structural integrity also serve as capacitor plates for capacitance-based damage sensing, eliminating the need for separate dedicated sensing components and reducing overall device complexity.
Solution Approach 2:
The patent merges the structural housing components with the detection system by making the upper and lower housing portions electrically conductive and using them directly as capacitor plates. This combining of structural and sensing functions into unified components achieves precise damage detection capability without adding separate complex sensing structures, thus avoiding increased device complexity.
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
Enables early detection of underbody structure damage, facilitating timely maintenance, preventing dangerous dielectric breakdowns, and reducing the burden of replacing entire battery systems.
Implementation Method 1
an upper portion (16) and a lower portion (18) which are electrically conductive and oppositely arranged at a distance from each other to be electrically isolated from each other such that a capacitor (C) is formed
Implementation Method 2
The detection system (14) includes a resonant circuit (20) into which the capacitor (C) is interconnected. The detection system (14) is further configured to apply a voltage to the resonant circuit (20) at the resonance frequency of the resonant circuit (20) and to detect the change of the capacitance by monitoring a change of the current at the resonance frequency
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present disclosure refers to a housing (10, 10') for a battery system (100). The housing (10, 10') includes an underbody structure (12) and a detection system (14) for detecting damages of the underbody structure (12). The underbody structure (12) includes an upper portion (16) and a lower portion (18) which are electrically conductive and oppositely arranged at a distance (d) from each other to be electrically isolated from each other such that a capacitor (C) is formed and the detection system (14) includes a resonant circuit (20) into which the capacitor (C) is interconnected. The detection system (14) is configured to apply a voltage to the resonant circuit (20) at the resonance frequency of the resonant circuit (20) and to detect the change of the capacitance by monitoring a change of the current at the resonance frequency.