Synthetic Resin Core Member for Cylindrical Battery Impact Protection
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Solution Overview
Problem
Conventional cylindrical lithium rechargeable batteries are prone to cap assembly deformation and breakage due to the movement of the core member upon external impacts, such as falling, which can lead to safety vent deformation and potential short circuits.
Innovation Solution
A core member made of synthetic resin, softer and lighter than stainless steel, is inserted into the electrode assembly to prevent deformation and breakage, featuring a rod shape with a hole and grooves that allow gas exhaustion and wing sections for enhanced support, reducing the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a steel use stainless (SUS) core member is used, then the core member has high strength and rigidity, but it moves easily upon external impact causing cap assembly deformation and breakage
Solution Approach 1:
The core member material is changed from steel use stainless (SUS) to a softer material with lower specific gravity. This parameter change in material properties reduces the core member's hardness and density, allowing it to absorb impact energy through deformation rather than transferring it to the cap assembly, thereby preventing cap assembly damage while maintaining structural support function.
Solution Approach 2:
The invention uses a composite material approach by selecting a material that combines specific properties: softer than SUS with lower specific gravity. This composite material strategy creates a core member that optimizes both mechanical support and impact absorption characteristics, resolving the contradiction between strength and impact resistance.
2Stability of the object's composition
If a hard core member is used, then the core member provides structural support, but it causes deformation or breakage of the safety vent upon impact
Solution Approach 1:
The core member's material parameters are changed to be softer than SUS, enabling it to deform under impact rather than transmitting force to the safety vent. This parameter change maintains the core member's ability to provide structural stability to the electrode assembly while eliminating the harmful effect of safety vent deformation or breakage.
3Stability of the object's composition
If a heavy core member is used, then the core member has high mass for stability, but it increases the overall battery weight
Solution Approach 1:
The core member's specific gravity is reduced by selecting a material lighter than SUS. This parameter change in density allows the core member to maintain its stabilizing function while significantly reducing the overall battery weight, improving the weight-to-stability ratio of the battery system.
Data Source
AI summary
A cylindrical lithium rechargeable battery includes a core member made of a material that is softer than steel use stainless and has specific gravity lower than that of steel use stainless. The core member may prevent deformation and breakage of a cap assembly.