Battery Capacitance Sensing for Early Swelling Detection
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Solution Overview
Problem
Lithium-ion batteries used in computing devices experience irreversible swelling due to gas generation during operation, which can lead to battery failure, and existing methods lack effective early detection and mitigation strategies while maintaining a small form factor.
Innovation Solution
A system utilizing a capacitance measurement approach with conductive plates or foils connected to the battery surfaces to quantify swelling, allowing for early detection and mitigation through adjustments in charge capacity and temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional battery monitoring methods are used, then the device can maintain a small form factor, but early detection of battery swelling is not achieved
Solution Approach 1:
The patent replaces mechanical or complex sensor-based detection systems with an electrical capacitance measurement system. By measuring the capacitance between the battery terminals, the system can detect swelling-induced changes in internal resistance and electrolyte properties without requiring physical contact sensors or complex mechanical structures, thus achieving early detection while maintaining device simplicity
Solution Approach 2:
The battery itself serves as the sensing element by exhibiting measurable electrical property changes (capacitance, internal resistance) when swelling occurs. The existing battery terminals and electrolyte become part of the detection mechanism, eliminating the need for separate dedicated sensing components and reducing overall system complexity
2Reliability
If battery swelling is detected early, then mitigation measures can be taken to extend battery lifespan, but additional monitoring components increase device complexity
Solution Approach 1:
The capacitance measurement system serves multiple functions: it monitors battery charge state, detects internal resistance changes, identifies swelling conditions, and enables predictive maintenance. This single measurement approach replaces what would otherwise require multiple separate sensors and monitoring systems, achieving improved reliability without proportionally increasing device complexity
Solution Approach 2:
The system continuously measures battery electrical properties and provides feedback to control logic that can adjust charging parameters or alert users to potential issues. This closed-loop feedback enables proactive mitigation of swelling by modifying charge capacity or cooling strategies based on real-time battery condition assessment
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 precise detection of battery swelling, allowing for timely mitigation measures such as reducing charge capacity or cooling the battery to slow swelling, thereby extending the battery's lifespan and preventing failure.
Implementation Method 1
determine a capacitance of the battery via the signal
Data Source
AI summary
Example implementations relate to battery swelling determinations. In some examples, an electronic device can include a battery including a first surface and a second surface, where the second surface is opposite the first surface, a first conductor located on the first surface of the battery, and a second conductor located on the second surface of the battery, where the battery is to act as a dielectric medium such that a capacitance is generated by the electronic device via the first conductor, the second conductor, and the battery.