Elastic Insulating Sheet for Stress-Resistant Solid-State Batteries
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Solution Overview
Problem
Existing all-solid-state rechargeable batteries face challenges in maintaining mechanical integrity and preventing short circuits due to stress accumulation and potential penetration, which can lead to thermal and electrical safety issues.
Innovation Solution
An elastic sheet is introduced, comprising a curable resin and an insulating filler, with specific mechanical properties such as a dielectric breakdown strength of 7 kV/mm to 15 kV/mm, elongation of 150% to 200%, and tensile strength of 3 MPa to 6 MPa, designed to be interposed between cell structures or on the outermost surface to absorb stress and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing all-solid-state rechargeable batteries are used without additional protective layers, then the battery structure is simpler, but mechanical integrity cannot be maintained and short circuits occur due to stress accumulation and penetration
Solution Approach 1:
An elastic sheet is introduced as an intermediary component between cell structures or on the outermost surface of the battery. This sheet acts as a mediator that absorbs stress and prevents direct contact between penetrating elements and internal components, thereby maintaining mechanical integrity without fundamentally altering the battery's core structure
Solution Approach 2:
A flexible elastic sheet with specific mechanical properties (elongation ≥150%, tensile strength 3-6 MPa) is applied as a protective layer. This thin film structure provides mechanical protection and stress absorption while maintaining flexibility and not significantly increasing structural complexity
2Ease of manufacture
If the battery structure is simplified without the elastic sheet, then manufacturing is easier, but thermal and electrical safety cannot be ensured under stress and penetration conditions
Solution Approach 1:
The elastic sheet serves as a protective intermediary layer that can be easily integrated into the battery assembly process. It provides thermal and electrical safety by preventing direct contact between penetrating elements and internal components, while its flexible nature allows for straightforward manufacturing and assembly
3Reliability
If a rigid protective layer is used to prevent short circuits, then electrical safety is improved, but stress absorption capability is reduced and mechanical flexibility is lost
Solution Approach 1:
Instead of a rigid protective layer, a flexible elastic sheet is used that combines electrical insulation properties with high elongation capability (≥150%). This flexible film maintains electrical safety by preventing short circuits while simultaneously absorbing stress through its elasticity, avoiding the pitfalls of rigid structures
Solution Approach 2:
The protective layer's mechanical parameters are specifically optimized with elongation ≥150% and tensile strength 3-6 MPa. These parameter changes enable the material to exhibit both electrical insulation and superior stress absorption capabilities, resolving the contradiction between electrical safety and stress absorption
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 elastic sheet effectively absorbs stress, prevents short circuits, and maintains insulating properties even under penetration, thereby enhancing the thermal, electrical, and physical safety of all-solid-state rechargeable batteries.
Implementation Method 1
an elastic sheet for an all-solid-state rechargeable battery, the elastic sheet including a curable resin and an insulating filler, wherein the elastic sheet has a dielectric breakdown strength of about 7 kV/mm to about 15 kV/mm, an elongation of greater than or equal to about 150%, and a tensile strength of about 3 MPa to about 6 MPa
Implementation Method 2
an insulating filler, wherein the elastic sheet has a dielectric breakdown strength of about 7 kV/mm to about 15 kV/mm
Data Source
AI summary
An elastic sheet for an all-solid-state rechargeable battery, the elastic sheet includes a curable resin; and an insulating filler, wherein the elastic sheet has a dielectric breakdown strength of about 7 kV/mm to about 15 kV/mm, an elongation of greater than or equal to about 150%, and a tensile strength of about 3 MPa to about 6 MPa.