All-solid-state Battery Shunt Part Adhesive Extraction
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Solution Overview
Problem
In all-solid-state batteries, the adhesion of current collector layers and insulating layers in the short-circuit current shunt part can lead to cracking and deformation under constraint pressure, affecting the shunt part's functionality during nail penetration testing, as the adhesive strain causes instability and potential short-circuiting.
Innovation Solution
The solution involves not providing adhesive between the current collector layers and the insulating layer at the nail-penetrating portion and applying constraint pressure, allowing the layers to slide and reducing strain, with adhesive only in zones not subjected to constraint pressure, ensuring stable operation during testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is provided between the current collector layers and the insulating layer in the short-circuit current shunt part, then the layers are firmly adhered and maintain structural integrity, but the adhesive cracks under constraint pressure and causes deformation affecting shunt functionality
Solution Approach 1:
The adhesive is extracted from the zones subjected to constraint pressure (nail-penetrating portions) and only provided in zones not subjected to constraint pressure. This removes the source of cracking while preserving adhesion where it is needed for structural integrity.
Solution Approach 2:
The adhesive distribution is made non-uniform: adhesive is provided in zones not subjected to constraint pressure (such as edge portions) but omitted from zones subjected to constraint pressure (nail-penetrating portions). This local differentiation optimizes both adhesion and resistance to deformation.
2Ease of manufacture
If adhesive is provided between the current collector layers and the insulating layer, then the layers are firmly bonded for easy handleability during assembly, but the adhesive creates strain under constraint pressure leading to cracking and instability
Solution Approach 1:
Adhesive is extracted from constraint pressure zones to eliminate the source of strain and cracking, while maintaining adhesion in non-constraint zones to preserve assembly ease and structural stability.
Solution Approach 2:
Adhesive is selectively applied only in zones not subjected to constraint pressure, creating local adhesion where it benefits assembly while avoiding regions where it would compromise structural stability under load.
3Reliability
If the short-circuit current shunt part is subjected to constraint pressure to maintain contact, then battery performance is improved, but the adhesive in the shunt part cracks due to strain from the constraint pressure
Solution Approach 1:
Adhesive is removed from zones subjected to constraint pressure, allowing the shunt part to withstand the necessary constraint pressure for maintaining contact and battery performance without adhesive cracking.
Solution Approach 2:
Adhesive is provided only in zones not subjected to constraint pressure, enabling the shunt part to receive full constraint pressure for optimal battery performance while the adhesive remains intact in protected zones.
Data Source
AI summary
In an all-solid-state battery including at least one short-circuit current shunt part and at least one electric element which are stacked, when the battery is constrained, cracking etc. of the adhesive in the short-circuit current shunt pail is prevented.The all-solid-state battery includes at least one short-circuit current shunt part and at least one electric element which are stacked, to the all-solid-state battery constraint pressure being applied by a constraining member in a direction of stacking the short-circuit current shunt part and the electric element, wherein the short-circuit current shunt part includes a first current collector layer, a second current collector layer, and an insulating layer provided between the first and second current collector layers, all of these layers being stacked along the direction, to be adhered to each other with adhesive, the electric element includes a cathode current collector layer, a cathode material layer, a solid electrolyte layer, an anode material layer, and an anode current collector layer, all of these layers being stacked along the direction, the first current collector layer is electrically connected with the cathode current collector layer, the second current collector layer is electrically connected with the anode current collector layer, and the adhesive is provided for a zone in the short-circuit current shunt part, to the zone the constraint pressure from the constraining member not being applied.