Secondary Battery Case Reinforcement for Uniform Electrode Spacing
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Solution Overview
Problem
Secondary batteries face issues with internal component deformation and non-uniform spacing, leading to inefficiencies in charging and discharging, and reduced service life.
Innovation Solution
A secondary battery design incorporating a deformation prevention unit with a base part and protrusion support part to maintain consistent spacing between internal components, using materials like polyimide, polyether ether ketone, and polytetrafluoroethylene, and adhesive layers to secure the unit to the case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the case is made from a soft film to provide flexibility, then the ease of manufacture is improved, but the case becomes prone to deformation under external force
Solution Approach 1:
The deformation prevention unit is formed from a composite material comprising a base part and a protrusion support part made of different materials with complementary properties. The base part uses a soft film material for ease of manufacture and flexibility, while the protrusion support part uses a rigid material for structural support and deformation prevention. This composite structure resolves the contradiction by combining materials with different characteristics to achieve both ease of manufacture and shape stability.
2Productivity
If internal components are placed closer together to increase energy density, then the productivity is improved, but the spacing uniformity deteriorates leading to charging/discharging inefficiency
Solution Approach 1:
The protrusion support part is designed with predetermined geometric features that establish fixed spacing relationships between internal components before assembly is complete. These pre-formed support structures ensure uniform spacing is maintained during charging and discharging operations, allowing components to be placed closer together for high energy density while preserving the precision needed for efficient operation.
3Stability of the object's composition
If the deformation prevention unit uses rigid materials to prevent case deformation, then the shape stability is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The deformation prevention unit applies rigidity only where needed through its dual-material structure. The base part is made from a soft film material that is easy to manufacture, while the protrusion support part is made from a rigid material that provides localized structural support at critical points. This local differentiation of material properties achieves shape stability without requiring the entire unit to be made from difficult-to-manufacture rigid materials.
Data Source
AI summary
A secondary battery comprises an electrode assembly including a first electrode plate, a second electrode plate, and a separator. A case is provided for accommodating the electrode assembly. A deformation prevention member is provided in contact with an outer surface of the case and configured to prevent deformation of the case.