Battery Expansion Detection via Rigid Body Sensor Layout
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Solution Overview
Problem
Conventional electronic devices detecting battery expansion require a significant thickness to accommodate both the battery and a sensor, limiting their compactness.
Innovation Solution
An electronic device design where a sensor attached to a rigid body, such as a display panel, detects elastic deformation caused by force application, outputting distinct waveforms based on the battery's contact state, allowing for reduced thickness without overlapping the sensor with the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor is attached directly to the battery to detect expansion, then detection reliability is improved, but device thickness increases
Solution Approach 1:
The patent introduces a rigid body as an intermediary between the battery and the sensor. The rigid body transmits the expansion force from the battery to the sensor, enabling indirect detection. This mediator allows the sensor to be positioned away from the battery, reducing device thickness while maintaining detection capability through the transmitted mechanical force.
Solution Approach 2:
The patent repositions the sensor from a direct attachment on the battery to a location on the rigid body that does not overlap with the battery in the Z-axis direction. This spatial reconfiguration in another dimension (lateral placement instead of vertical stacking) enables thickness reduction while preserving the detection function through the rigid body's force transmission.
2Length of moving object
If sensor and battery are positioned to avoid overlap, then device thickness is reduced, but detection precision may deteriorate
Solution Approach 1:
The rigid body serves as a force transmission intermediary that bridges the spatial gap between the battery and sensor. It faithfully transmits the expansion forces from the battery to the sensor without significant attenuation, maintaining detection precision despite the non-overlapping configuration that reduces device thickness.
Solution Approach 2:
The patent employs a curved flexible printed circuit board to connect the sensor to the battery area. This curved pathway allows the electrical connection to route around the battery without requiring direct vertical overlap, enabling the sensor to be positioned laterally where it can detect rigid body deformation while maintaining electrical connectivity.
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
This design enables the reduction of the electronic device's thickness for detecting secondary battery expansion while maintaining battery capacity, as the sensor detects deformation without overlapping the battery, thus minimizing the required housing space.
Implementation Method 1
a sensor attached to the rigid body and configured to detect elastic deformation of the rigid body generated when force is applied to the rigid body
Data Source
AI summary
An electronic device includes a battery having a first and second main surface arranged in a Z-axis direction, a rigid body facing the first main surface, and a sensor that is attached to the rigid body and detects elastic deformation of the rigid body generated when force is applied to the rigid body. The sensor does not overlap the battery when viewed in the Z-axis direction, and a first waveform of a signal output from the sensor when force of a first pattern is applied to the rigid body in a state where the first main surface is in contact with the rigid body is different from a second waveform of a signal output from the sensor when the force of the first pattern is applied to the rigid body in a state where the first main surface is not in contact with the rigid body.