Resilient Material Battery Swelling Control
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Solution Overview
Problem
Lithium-ion battery packages face issues such as swelling and edge shorting, which can lead to safety hazards and reduced cycle life, due to the lack of integral pressure-activated current-interrupt devices and thermal protection in conventional designs.
Innovation Solution
Incorporating a resilient material between the battery package and the battery bay surfaces to apply a load that reduces swelling and potential for edge shorting, allowing for thinner device designs while maintaining battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional battery designs without pressure-activated interrupt devices are used, then device thickness can be reduced, but battery safety and cycle life deteriorate due to swelling and edge shorting
Solution Approach 1:
A resilient material is introduced as an intermediary component between the battery package and the device housing. This material applies distributed pressure to the battery edges, preventing swelling and edge shorting without requiring traditional pressure-activated interrupt devices, thereby maintaining device thickness while improving battery safety and cycle life
Solution Approach 2:
The resilient material changes its physical parameters (compression force, elasticity) in response to battery swelling. By selecting materials with specific elastic moduli and compression characteristics, the system dynamically adjusts the pressure applied to the battery edges, preventing harmful swelling while maintaining thin device profile
2Reliability
If resilient material is added to apply pressure and reduce swelling, then battery safety and cycle life are improved, but device thickness increases
Solution Approach 1:
The resilient material is implemented as a thin film or flexible layer with optimized thickness (typically micrometers to millimeters). This thin flexible structure provides sufficient elastic pressure to prevent battery swelling while adding minimal thickness to the overall device, reconciling the conflict between safety improvement and thickness control
3Length of moving object
If battery edges are left uncompressed to maintain thin profile, then device thickness is minimized, but edge shorting and swelling increase reducing battery life
Solution Approach 1:
The resilient material is pre-compressed during device assembly to apply continuous pressure on the battery edges before any swelling occurs. This preliminary compressive force prevents the initiation of swelling and edge shorting mechanisms, extending battery cycle life while maintaining thin device profile throughout operation
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 use of a resilient material effectively minimizes swelling and edge shorting, enhancing safety and extending battery life, enabling the manufacture of thinner, more efficient mobile devices.
Implementation Method 1
a resilient material disposed between the battery package and at least one of the first surface and the second surface of the battery bay
Data Source
AI summary
A device can include a processor; memory accessible by the processor; a housing that includes a battery bay that includes a first surface and a second, opposing surface; a battery package disposed in the battery bay and operatively coupled to the processor; and a resilient material disposed between the battery package and at least one of the first surface and the second surface of the battery bay.