Pouch Case Composite Structure for Battery Stability
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Solution Overview
Problem
Pouch-type secondary batteries face stability issues due to low resistance to nail penetration and foreign substances, which can lead to rapid temperature increases and potential ignition, exacerbated by their weak physical and mechanical strength compared to prismatic batteries.
Innovation Solution
A pouch case comprising an inner resin layer with a porous non-woven fabric support and a polymer sealant, along with a metal layer and an outer resin layer, enhances nail penetration resistance and foreign substance resistance by providing a stable and protective structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a thin soft laminate sheet (pouch) is used as a case, then the battery can be made thin and assembly by thermal fusion is easy, but the physical and mechanical strength and stability to external impact are low
Solution Approach 1:
The pouch case uses a composite structure consisting of an inner resin layer (providing sealing), a metal layer (providing mechanical strength and nail penetration resistance), and an outer resin layer (providing protection). This composite material approach allows the battery to maintain thin dimensions while achieving the required mechanical strength and impact resistance through the synergistic combination of different materials.
2Stability of the object's composition
If a separate strength reinforcement layer is added on the surface of the soft pouch case, then the stability to external impact is improved, but the battery size, volume, weight and production cost increase
Solution Approach 1:
The invention merges the strength reinforcement function directly into the pouch case structure by incorporating a metal layer as an integral part of the case. This eliminates the need for separate reinforcement layers, as the metal layer simultaneously provides both structural strength and resistance to nail penetration, thereby avoiding increases in battery size, volume, and weight that would result from adding discrete reinforcement components.
Solution Approach 2:
The metal layer within the composite pouch case structure provides the necessary mechanical strength and impact resistance without requiring additional external reinforcement layers. The integrated composite design achieves stability to external impact while maintaining compact dimensions and avoiding the weight and volume penalties associated with separate reinforcement components.
3Device complexity
If the pouch case uses only inner resin layer, metal layer and outer resin layer, then the structure is simple, but the nail penetration characteristic and foreign substance resistance are insufficient
Solution Approach 1:
The pouch case employs a composite material structure with an inner resin layer, metal layer, and outer resin layer. The metal layer specifically addresses nail penetration resistance and foreign substance resistance, while the resin layers provide sealing and protection. This composite approach maintains relative structural simplicity while significantly improving reliability against penetration and contamination risks.
Data Source
AI summary
The present invention relates to a pouch case for a secondary battery and a pouch-type secondary battery comprising the same. More particularly, it relates to a pouch case for a secondary battery comprising an inner resin layer, a metal layer and an outer resin layer, wherein the inner resin layer comprises a porous non-woven fabric support having a plurality of pores and a polymer sealant filled in the pores of the non-woven fabric support; and a secondary battery comprising the same.