Battery Binding Piece Structure for Impact-Resistant Insulation
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Solution Overview
Problem
Lithium-ion batteries face safety performance issues due to external force damage leading to local short circuits, heating, and thermal runaway, which can result in fires, necessitating an improvement in their safety features.
Innovation Solution
A binding piece for electrochemical apparatuses comprising an insulation layer, a substrate layer, and at least one binding layer, where the elongation rates and tensile strengths of these layers are specifically controlled to enhance the safety performance by resisting external forces and maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulation layer thickness is increased to improve safety performance, then the safety performance is improved, but the energy density is reduced
Solution Approach 1:
The patent optimizes the thickness parameter of the insulation layer to a specific range (5-50 μm) to achieve the best balance between safety performance and energy density. This parameter optimization ensures sufficient protection against external forces while minimizing the space occupied by the protective layer, thereby maintaining high energy density of the battery.
Solution Approach 2:
The patent employs a composite structure consisting of multiple layers including the insulation layer, substrate layer, and binding layer. Each layer is made of specific materials with distinct properties that work synergistically to provide comprehensive protection. The insulation layer uses materials with high elongation rate to resist external forces, while the composite structure as a whole maintains structural integrity without significantly increasing overall thickness.
2Reliability
If the elongation rate of the insulation layer is increased to improve safety performance, then the safety performance is improved, but the tensile strength is reduced
Solution Approach 1:
The patent optimizes the tensile strength parameter of the insulation layer to a specific range (5-100 MPa) to achieve the best balance between elongation capability and tensile strength. This parameter optimization ensures the insulation layer can sufficiently deform to absorb external forces while maintaining enough strength to prevent rupture and maintain structural integrity.
3Reliability
If a protective binding piece is added to improve safety performance, then the safety performance is improved, but the device complexity is increased
Solution Approach 1:
The patent integrates multiple protective functions into a single binding piece component. The binding piece combines the insulation layer, substrate layer, and binding layer into one unified structure that simultaneously provides electrical insulation, mechanical protection, and structural binding functions. This merging approach improves safety performance without proportionally increasing device complexity.
Solution Approach 2:
The binding piece is designed as a multi-functional component that performs multiple roles: the insulation layer provides electrical insulation and resistance to external forces, the substrate layer provides structural support, and the binding layer provides adhesion to electrode components. This multi-functionality reduces the need for separate protective components, thereby limiting the increase in device complexity.
Data Source
AI summary
A binding piece includes an insulation layer, a substrate layer, and at least one binding layer stacked together; where one of the at least one binding layer forms on an outer surface of the binding piece; where 10%≤L2≤100%, 1.2≤L1/L2≤20, L1 is an elongation rate of the insulation layer, and L2 is an elongation rate of the substrate layer.