Electrode Assembly Fixing Parts for Battery Swelling Control
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Solution Overview
Problem
Conventional electrode assemblies experience swelling and deformation due to charge and discharge cycles, leading to performance deterioration, especially when high-capacity materials are used, as they cause significant volume expansion and stress on the electrode structure.
Innovation Solution
The electrode assembly features stacked electrode plates with externally protruding fixing parts that are bonded to maintain the stack interval, concentrating stress on the fixing parts rather than the active material-coated plates, thereby reducing swelling and preventing delamination or distortion. These fixing parts are designed to protrude by 10% to 50% of the electrode tap length and can form a V-shape or have specific structural features for enhanced bonding and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high-capacity materials are used to increase energy density, then battery capacity is improved, but volume expansion and swelling occur during charge and discharge
Solution Approach 1:
The electrode assembly is segmented into multiple electrode plates with fixed intervals between them. The fixing parts create discrete separation zones that allow individual plates to expand without causing overall assembly swelling, thus accommodating high-capacity materials while controlling volume expansion.
Solution Approach 2:
Fixing parts are formed on the electrode plates before assembly, creating predetermined expansion spaces and maintaining fixed intervals between plates. This preliminary structural preparation prevents swelling during subsequent charge-discharge cycles while allowing the use of high-capacity materials.
2Productivity
If electrode plates are stacked closely to increase energy density, then productivity is improved, but stress concentration causes delamination and distortion
Solution Approach 1:
The electrode assembly is divided into multiple electrode plates with fixed intervals between them. The fixing parts create discrete separation zones that allow individual plates to expand without causing overall assembly swelling, thus accommodating high-capacity materials while controlling volume expansion.
Solution Approach 2:
Fixing parts are formed on the electrode plates before assembly, creating predetermined expansion spaces and maintaining fixed intervals between plates. This preliminary structural preparation prevents swelling during subsequent charge-discharge cycles while allowing the use of high-capacity materials.
3Stability of the object's composition
If fixing parts are formed on electrode plates to maintain stack interval, then structural stability is improved, but device complexity increases
Solution Approach 1:
The fixing parts are integrated directly onto the electrode plates during the forming process, combining the functions of structural support and interval maintenance into a single component. This merging approach maintains stability while minimizing additional structural complexity.
Solution Approach 2:
The fixing parts serve multiple functions: maintaining stack intervals, preventing swelling, and providing structural support. This multi-functionality reduces the need for additional separate components, thereby maintaining simplicity despite the enhanced stability requirements.
Data Source
AI summary
Disclosed is an electrode assembly with a structure in which a plurality of electrode plates are stacked while a separator is interposed between a positive electrode plate and a negative electrode plate, each of the electrode plates including an electrode tap that externally protrude from one side thereof to form a tap-lead coupler and at least two or more fixing parts that externally protrude from each of electrode plate by a length of 10% to 50% of a length of the electrode tap from the one side and/or the other side, wherein fixing parts with the same polarity, which are positioned in parallel to each other in up and down directions, are bonded to each other to maintain a stack interval between the electrode plates while the electrode plates are stacked.