Dual Pressure-Acceleration Sensor With Filtered Signal Separation
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Solution Overview
Problem
Electric vehicles with large-scale lithium-ion batteries face challenges in detecting thermal runaway and physical impacts due to limited space for sensors, necessitating a solution for simultaneous measurement of pressure and acceleration to ensure safety.
Innovation Solution
A sensor integrating a substrate, sensor element, seismic mass material, and electronic circuitry with distinct filters for pressure and acceleration signals, allowing simultaneous measurement and separation of these signals using low and high pass/band pass filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure sensor is added to detect thermal runaway, then detection capability is improved, but device complexity and space consumption increase
Solution Approach 1:
The patent combines pressure sensing and acceleration sensing into a single sensor device. The sensor element integrates both functional capabilities, allowing thermal runaway detection (via pressure) and impact detection (via acceleration) without requiring separate sensors, thus reducing device complexity and space consumption while maintaining detection capability
Solution Approach 2:
The single sensor device performs multiple functions: it detects both static pressure changes indicative of thermal runaway and dynamic acceleration changes indicative of physical impacts. This multi-functionality eliminates the need for separate dedicated sensors for each detection purpose
2Measurement precision
If separate pressure and acceleration sensors are used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies signal segmentation through filtering. The raw sensor output is separated into distinct pressure and acceleration components using a first filter for pressure signals and a second filter for acceleration signals. This allows precise measurement of both parameters from a single sensor element without cross-contamination
Solution Approach 2:
The patent introduces filtering circuitry as an intermediary between the sensor element and the output. The filters act as mediators that process the combined sensor signal to extract and separate the pressure and acceleration components, enabling precise measurement without requiring physically separate sensors
3Reliability
If multiple sensors are incorporated, then detection reliability is improved, but available space is consumed
Solution Approach 1:
The patent merges pressure sensing and acceleration sensing into a single integrated sensor device with one sensor element. This consolidation maintains the reliability of detecting both thermal runaway and physical impacts while occupying minimal space within the battery system, directly addressing the space constraint
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
Effectively separates and measures pressure and acceleration signals, providing early detection of thermal runaway and physical impacts, enhancing safety in vehicle batteries and airbags.
Implementation Method 1
a sensor element disposed on the substrate, a material being connected with the sensor element and being exposed to the environment of the sensor
Implementation Method 2
the material is configured to act as a seismic mass
Data Source
AI summary
A sensor for parallel measurement of pressure and acceleration of a vehicle, including a substrate, a sensor element disposed on the substrate, a material being connected with the sensor element and being exposed to the environment of the sensor, wherein the material is configured to act as a seismic mass, and an electronic circuitry connected with the sensor element and including a first filter and a second filter, wherein the first and second filters have different filter characteristics so that an output of the first filter is representative for the pressure and an output of the second is representative for the acceleration.