Capacitive Battery Swelling Detection in Portable Electronics

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Solution Overview

Problem

Lithium-ion batteries can swell as they degrade, posing safety hazards due to their flammable electrolyte and the need for pressurization, and existing systems fail to effectively detect and manage this swelling in confined spaces, leading to potential mechanical damage in devices like laptops.

Innovation Solution

A portable electronic device equipped with a capacitance sensor system that includes a first sensor integrated into a trackpad or structural feature and a second sensor in contact with the battery assembly, using compressible materials and electrodes to detect changes in capacitance and alert for swelling, allowing for timely intervention.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional rigid plastic or metal cases are used to confine battery swelling, then mechanical damage is prevented, but device weight and complexity increase

Engineering Contradiction:

Improveprevention of mechanical damageVSAvoidcase structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces mechanical detection systems (physical switches, pressure sensors requiring complex assemblies) with a capacitive sensing system that uses electrical fields to detect battery swelling. The capacitive sensor array integrated into the keyboard structure eliminates the need for separate mechanical detection components, reducing overall device complexity while maintaining reliable detection capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The keyboard structure serves multiple functions: it acts as both the user interface and the mounting structure for capacitive sensors. The sensor array is integrated into the existing keyboard architecture, allowing the same structural elements to perform both mechanical support and swelling detection functions, thereby avoiding additional complex case structures.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If capacitive sensors are integrated into the keyboard structure, then detection precision is improved, but device complexity increases

Engineering Contradiction:

Improvebattery swelling detection precisionVSAvoidsensor integration complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges the capacitive sensor array with the keyboard structure, integrating multiple sensing elements directly into the existing keyboard assembly. This consolidation allows high-precision detection across multiple key positions without requiring separate sensor modules, reducing overall device complexity while maintaining measurement precision.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The keyboard is divided into multiple sensing zones with individual capacitive sensors at different key positions. This segmentation allows precise localization of battery swelling by detecting which specific keys experience capacitance changes, improving measurement precision without requiring a single complex sensor system.

Inventive Principle:

Principle #1Segmentation

3Area of stationary object

If multiple capacitive sensors are distributed across the keyboard, then detection coverage is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvedetection coverage areaVSAvoidsensor assembly manufacturing

Core Design Contradiction:

Area of stationary objectVSEase of manufacture

Solution Approach 1:

The patent uses identical capacitive sensor designs replicated across multiple keyboard positions. This standardization allows for simplified manufacturing through mass production of identical sensor units, reducing manufacturing complexity despite increased detection coverage. Each sensor follows the same design pattern, making assembly and replacement straightforward.

Inventive Principle:

Principle #26Copying

4Reliability

If real-time monitoring of capacitance changes is implemented, then early warning capability is improved, but energy consumption increases

Engineering Contradiction:

Improveearly warning capabilityVSAvoidsensor system energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The capacitive sensor system implements periodic sampling of capacitance values rather than continuous monitoring. The controller reads capacitance data at intervals, allowing early detection of battery swelling trends while significantly reducing energy consumption compared to continuous real-time monitoring. This periodic measurement approach maintains reliability by detecting changes over time without excessive power usage.

Inventive Principle:

Principle #19Periodic action

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 system effectively detects battery swelling, preventing mechanical damage by quantifying forces exerted on the device and sending alerts when predetermined capacitance thresholds are reached, ensuring safety and extending the lifespan of electronic devices.

Implementation Method 1

A change in a size may depict a condition that is useful to know... this disclosure relates to systems and methods for capacitively sensing changes to size

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS11796302B2Size detection

Publication Date: 2023.10.24 CIRQUE CORP

AI summary

A capacitance sensor may be positioned to detect size changes in objects. The sensor may be constructed with to use mutual capacitance or self-capacitance to detect the size changes.