Heat-Resistant Member for Battery Insulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rechargeable batteries face short-circuit issues due to gasket softening or melting when temperature increases, causing electrical shorts between the case and cap plate.
Innovation Solution
Incorporating a heat-resistant member with a higher melting point than the gasket, positioned between the gasket and cap plate, to prevent short circuits, which can be made of materials like polyimide resin or include reinforcing members such as glass fiber fabric for enhanced strength and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gasket is used to insulate the case from the cap plate, then electrical insulation is achieved, but the gasket softens or melts at elevated temperatures causing short circuits
Solution Approach 1:
A heat-resistant member made of materials such as polyimide resin or glass fiber fabric is introduced as an intermediary component between the gasket and the cap plate. This intermediary maintains electrical insulation and structural integrity at elevated temperatures where the gasket would otherwise soften or melt, preventing short circuits between the case and cap plate.
Solution Approach 2:
The heat-resistant member utilizes composite materials with high thermal stability, such as polyimide resin combined with glass fiber fabric or metal reinforcing members. These composite materials provide both electrical insulation properties and high-temperature resistance, maintaining structural integrity and preventing gasket deformation at elevated temperatures.
2Reliability
If the gasket is positioned directly against the cap plate for insulation, then electrical isolation is achieved, but structural strength is insufficient at high temperatures
Solution Approach 1:
The heat-resistant member employs composite materials combining organic insulating layers (polyimide resin) with inorganic reinforcing structures (glass fiber fabric or metal). This composite structure provides both electrical insulation and high-temperature structural strength, preventing gasket deformation and maintaining assembly integrity.
Solution Approach 2:
The heat-resistant member is strategically positioned at the interface between the gasket and cap plate where thermal and mechanical stresses are most critical. This localized reinforcement provides enhanced thermal and structural properties precisely where needed, without adding unnecessary complexity elsewhere in the battery structure.
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
The heat-resistant member effectively stabilizes the battery by preventing short circuits at elevated temperatures, ensuring reliable operation and safety.
Implementation Method 1
a heat-resistant member between an upper portion of the gasket and an outer surface of the cap plate and having a higher melting point than the gasket
Implementation Method 2
a heat-resistant member between an upper portion of the gasket and an outer surface of the cap plate
Implementation Method 3
the heat-resistant member includes a reinforcing member and an insulating layer configured to enclose the reinforcing member
Data Source
AI summary
A rechargeable battery including an electrode assembly including a positive electrode and a negative electrode, a case configured to encase the electrode assembly, a cap plate coupled to the case, a gasket between the case and cap plate and configured to insulate the case from the cap plate, and a heat-resistant member between an upper portion of the gasket and an outer surface of the cap plate and having a higher melting point than the gasket.