All-Solid-State Battery Electrode Structure for Crack-Resistant Tabs
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Solution Overview
Problem
All-solid-state rechargeable batteries face issues with surface protrusions and recesses, leading to cracks in the current-collecting portion, which complicates the manufacturing process and disrupts electrical connectivity.
Innovation Solution
A manufacturing method that includes stacking solid electrolyte layers on both surfaces of the first electrode layer, incorporating a current-collecting portion protected by a current-collecting portion protection member, and using an insulating layer to reduce gaps and cracks, with specific dimensions for the cutout and roughened portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If pressurization is applied in the stacking direction to reduce surface protrusions and recesses, then surface flatness is improved, but cracks and cuts occur in the current-collecting portion
Solution Approach 1:
The current-collecting portion protection member is arranged to wrap the current-collecting portion before pressurization is applied. This preliminary protective action prevents cracks and cuts during the pressurization process while still allowing the pressurization to achieve surface flatness reduction.
Solution Approach 2:
The current-collecting portion protection member acts as an intermediary between the pressurization force and the current-collecting portion. It transmits the necessary pressure for surface flatness while filtering out the harmful concentrated stresses that would cause cracks and cuts.
2Reliability
If the current-collecting portion is protected during pressurization, then cracks and cuts are suppressed, but the manufacturing process becomes more complex
Solution Approach 1:
The current-collecting portion protection member is merged with the insulating layer, combining two functions into a single component. This integration reduces the number of separate parts and simplifies the manufacturing process while still providing protection during pressurization.
Solution Approach 2:
The insulating layer is given multiple functions: it provides electrical insulation and simultaneously serves as the current-collecting portion protection member during pressurization. This multi-functionality reduces the need for additional protective components and simplifies the overall structure.
3Object-affected harmful factors
If protrusions and recesses are reduced on the battery surface, then physical influences from neighboring batteries are reduced, but the current-collecting portion becomes more susceptible to damage
Solution Approach 1:
The protection member is installed before pressurization to prevent damage during the process that reduces surface protrusions and recesses. This ensures the current-collecting portion remains intact while the surface flatness improvement reduces physical influences from neighboring stacked batteries.
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 method effectively suppresses cracks and cuts in the current-collecting portion, planarizes the battery surface, and simplifies the manufacturing process while enhancing electrical connectivity and structural stability.
Implementation Method 1
a current-collecting portion protection member that protects the current-collecting portion is arranged to wrap the current-collecting portion
Implementation Method 2
pressurizing the stacked body in the stacking direction
Data Source
AI summary
The present invention relates to an all-solid-state rechargeable battery in which the protrusions and recesses of the surface of the all-solid-state rechargeable battery are reduced, and a current-collecting portion is difficult to crack or cut. The all-solid-state rechargeable battery includes a first electrode layer that is either a positive electrode layer or a negative electrode layer; solid electrolyte layers stacked on both surfaces of the first electrode layer, respectively; a second electrode layer that is the other of the positive electrode layer or the negative electrode layer stacked on the outer surfaces of the solid electrolyte layers, respectively; an insulating layer disposed on a side end surface of the first electrode layer; and a thin current-collecting portion protruding from the first electrode layer through the insulating layer to the outside, wherein a side end surface of the insulating layer on the side from which the current-collecting portion protrudes has a roughened portion having a surface roughness that differs from that of another side end surface of the insulating layer.