Cable-Type Cell Assembly for Flexible, Durable Battery Packs
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Solution Overview
Problem
Conventional pouch-type battery cells experience performance degradation due to increased thickness and volume, leading to reduced flexibility and mechanical stress when used in devices requiring morphological or mechanical deformation.
Innovation Solution
A cable-type cell assembly comprising a cable-type electrode assembly with an inner electrode support, spirally wound inner and outer electrodes, and a laminated embedded member, connected via an electrode tab and sheathing member to form a cable-type battery module and pack, allowing for high flexibility and mechanical durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pouch-type cells are connected in series or parallel to match capacity and voltage specifications, then the battery pack can meet device requirements, but the thickness and volume of the cell assembly increases
Solution Approach 1:
The battery system is segmented into multiple independent cable-type cells (monocells) that can be individually configured and connected. Each cable-type cell contains segmented electrode assemblies with inner and outer electrodes that can be independently wound and packaged, allowing flexible arrangement to achieve desired capacity without proportionally increasing volume.
Solution Approach 2:
The cable-type cell structure implements nesting by placing the inner electrode assembly inside the outer electrode assembly. The inner electrode support, inner electrode, inner separation layer are nested within the outer electrode, outer separation layer structure, creating a compact concentric configuration that maximizes energy density while minimizing volume.
2Quantity of substance
If pouch-type cells are connected in series or parallel to match capacity and voltage specifications, then the battery pack can meet device requirements, but the thickness and volume of the cell assembly increases
Solution Approach 1:
The invention transitions from the conventional planar/pouch configuration to a three-dimensional cable-type structure. The electrode assemblies are wound in concentric circles around an inner electrode support, creating a cylindrical geometry that utilizes radial space efficiently. This dimensional change allows capacity scaling without proportional increases in thickness.
3Quantity of substance
If the thickness and volume of pouch-type cells increase, then battery capacity can be increased, but flexibility of the cells is reduced
Solution Approach 1:
The cable-type cell employs flexible packaging structures including a sheathing member that envelops the electrode assemblies. The sheathing member and outer electrode structure are designed with flexible materials and configurations that allow the cell to bend and deform without damage, maintaining flexibility even as capacity increases through additional wound layers.
4Quantity of substance
If the thickness and volume of pouch-type cells increase, then battery capacity can be increased, but mechanical stress is directly applied to cell components during mechanical deformation
Solution Approach 1:
The cable-type cell structure incorporates protective elements before mechanical stress occurs. The sheathing member provides a protective outer layer that cushions and distributes mechanical stress. The concentric wound structure of inner and outer electrodes with separation layers creates a resilient configuration that absorbs deformation energy, preventing direct stress transmission to critical components like the electrolyte and electrode interfaces.
Data Source
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AI summary
With the development of wearable devices having the capability of morphological or mechanical deformation, there is a need for morphological flexibility and mechanical durability in a battery pack for the wearable devices. Accordingly, conventional pouch-type cells are connected to each other in series or in parallel to constitute a battery pack in order to match the capacity and voltage according to the specifications of a device to be driven. However, as the thickness and volume of the cell assembly increases, a problem of performance degradation due to flexibility and mechanical stress occurs. Disclosed are a cable-type cell assembly, a cable-type battery module, and a cable-type battery pack capable of fundamentally solving the above problem. It is possible to meet the capacity and voltage according to the specifications of electronic devices while maintaining mechanical durability.