Laminated Battery Electrode Structure for Electrolyte Penetrability
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Solution Overview
Problem
Conventional non-aqueous electrolyte secondary batteries face difficulties in maintaining resistance properties and electrolyte penetrability due to adhesive usage, leading to increased manufacturing time and reduced productivity.
Innovation Solution
A laminated electrode body configuration where the first separator and electrode are bonded with adhesive only in non-facing areas, allowing for improved electrolyte flow and resistance, with larger active material layers and separate current collectors to prevent ion deposition and positional displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the separator and electrode are bonded by adhesive to prevent misalignment, then assembly precision is improved, but electrolyte penetrability deteriorates
Solution Approach 1:
The adhesive is applied selectively only to the non-facing area of the separator, not the entire surface. This local application maintains alignment precision where needed while preserving electrolyte penetrability in the facing area that contacts the active material layer.
Solution Approach 2:
The separator surface is functionally segmented into two zones: a facing area that remains adhesive-free for electrolyte penetration, and a non-facing area that receives adhesive for bonding and alignment. This segmentation resolves the contradiction by assigning different properties to different regions.
2Stability of the object's composition
If adhesive is applied to bond separator and electrode, then structural stability is improved, but charge carrier movement deteriorates
Solution Approach 1:
Adhesive application is restricted to the non-facing area of the separator, creating a local quality distinction where the facing area maintains high lithium ion conductivity while the non-facing area provides structural bonding stability.
Solution Approach 2:
The separator functionality is segmented into a charge carrier transport zone (facing area without adhesive) and a structural bonding zone (non-facing area with adhesive), allowing both stability and reliability to be optimized in their respective regions.
Data Source
AI summary
The non-aqueous electrolyte secondary battery disclosed herein includes the laminated electrode body having cell units in each of which a first electrode, a first separator, a second electrode, and a second separator are stacked. The first electrode has a first active material layer, and the second electrode has a second active material layer. A facing area which faces the second active material layer is formed in a central portion of the first active material layer. The first separator and the first electrode are bonded to each other by a first adhesive, and the first adhesive is not disposed in the facing area and is disposed in an area other than the facing area. The first separator and the second separator are not bonded to the second active material layer, and are joined to each other outside the second electrode.