Mechanical Supports for Battery Cell Stress Resistance
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Solution Overview
Problem
Lithium-polymer batteries in portable electronic devices are susceptible to mechanical stress, leading to potential faults such as deformation, weakening, and short circuits due to the lack of a rigid enclosure, which compromises their integrity and performance.
Innovation Solution
The introduction of apertures within the battery cell layers, filled with mechanical supports like posts, spacers, or disks made of inert and thermally conductive materials, to distribute structural loads and enhance resistance to mechanical stress, while also facilitating heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a flexible pouch is used to enclose battery layers, then weight and space are saved, but resistance to mechanical stress deteriorates
Solution Approach 1:
The patent combines flexible pouch material with rigid mechanical supports (posts, spacers, or disks) to create a composite structure. The pouch provides flexibility and weight savings while the mechanical supports embedded within provide structural reinforcement and stress distribution, resolving the contradiction between flexibility and mechanical strength.
Solution Approach 2:
Instead of making the entire pouch rigid, the patent applies mechanical supports only at specific locations where stress concentration occurs. This localized reinforcement maintains the overall flexibility and light weight of the pouch while providing targeted protection against mechanical stress.
2Reliability
If material is removed from layers to form apertures, then mechanical support placement is enabled, but battery capacity may be reduced
Solution Approach 1:
The patent divides the battery structure into segments by creating apertures in the layers. Mechanical supports are placed in these apertures, segmenting the continuous layers while maintaining electrical connectivity through conductive paths around the apertures. This allows structural reinforcement without completely disrupting the battery architecture.
Solution Approach 2:
The patent optimizes the size, shape, and distribution of apertures to minimize impact on active material quantity while maximizing mechanical support effectiveness. By carefully controlling aperture parameters, the design achieves mechanical integrity with minimal loss of battery capacity.
3Strength
If mechanical supports are added to improve stress resistance, then structural strength is improved, but device complexity increases
Solution Approach 1:
The mechanical supports serve multiple functions: they provide structural reinforcement against mechanical stress, act as spacers to maintain layer separation, and can facilitate thermal management. This multi-functionality reduces the need for separate components, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The patent integrates mechanical supports directly into the pouch structure during assembly, merging the support function with the existing pouch and layer structure. This integration approach avoids adding separate complex subsystems while achieving the desired structural strength.
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 solution improves the mechanical resilience of lithium-polymer batteries, reducing the risk of deformation and faults, and allows for increased battery capacity and space savings by effectively transmitting structural loads and heat within the device.
Implementation Method 1
transmitting both structural loads and heat through the battery cell
Implementation Method 2
The mechanical support may also include a thermally conductive material to facilitate heat transfer within a portable electronic device containing the battery cell
Data Source
AI summary
The disclosed embodiments provide a battery cell. The battery cell includes a set of layers including a cathode with an active coating, a separator, and an anode with an active coating. The battery cell also includes a pouch enclosing the layers, wherein the pouch is flexible. The resistance of the battery cell to mechanical stress may be improved by removing material from one or more of the layers to form one or more apertures within the battery cell and placing a mechanical support in each of the apertures.