Adhesive-Coated Stack Electrode Assembly for Activation Bend Control
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Solution Overview
Problem
The lamination stack type electrode assembly experiences bending during the activation process due to uneven volume expansion of electrodes, leading to structural deformation and reduced productivity in battery manufacturing.
Innovation Solution
A four-layer structure electrode assembly is developed, where a first electrode, a first separator, a second electrode, and a second separator are sequentially stacked, with coating materials applied to the separators to enhance adhesive force between basic unit bodies, allowing for heat-pressing to bond the units and prevent bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If simple lamination of basic units is used to manufacture electrode assembly, then manufacturing process is simplified, but bending phenomenon occurs during activation process due to uneven volume expansion
Solution Approach 1:
The patent applies preliminary lamination treatment before the activation process to create adhesive bonds between basic units. By performing this bonding action in advance, the structure is prepared to resist the bending forces that will occur during subsequent activation when volume expansion happens unevenly between electrodes.
Solution Approach 2:
The lamination process creates a cushioning effect by forming adhesive layers between basic units before activation. These adhesive layers act as cushioning elements that distribute and absorb the stress from uneven volume expansion, preventing the bending phenomenon that would otherwise occur during activation.
2Ease of manufacture
If adhesive force is not formed between basic units, then manufacturing is easier, but bending occurs due to accumulated stress during charging
Solution Approach 1:
The patent introduces a lamination layer as an intermediary substance between basic units. This intermediary layer provides the necessary adhesive force to bond basic units together, preventing bending during activation while maintaining manufacturing simplicity. The lamination layer acts as the mediator that transfers and distributes stress between units.
3Reliability
If volume expansion of electrodes is uneven, then bending phenomenon occurs, but this is inherent to the electrochemical activation process
Solution Approach 1:
The patent changes the physical parameters of the electrode assembly by introducing lamination layers with specific adhesive properties. This parameter change allows the structure to accommodate the inherent volume expansion differences between electrodes during activation without suffering geometric deformation, thus maintaining both electrochemical performance and shape stability.
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 enhanced adhesive force between basic unit bodies prevents bending during charging and discharging, improving the productivity and stability of the battery by ensuring uniform stress distribution and alignment.
Implementation Method 1
coating materials having adhesive force are applied to respective surfaces of the first and second separator
Implementation Method 2
manufacturing method therefor
Data Source
AI summary
An electrode includes a unit body stack part formed by stacking at least one basic unit having a four-layer structure in which a first electrode, a first separator, a second electrode and a second separator are sequentially stacked. Each surface of the first separator and the second separator is coated with a coating material having adhesiveness, and the basic unit adheres to an adjacent radial unit in the unit body stack part. The electrode assembly of allows a heating and pressing process to be performed prior to a primary formation process so that a separator of one basic unit and a first electrode of the other basic unit to be adhered and fixed by a coating material coated on the separator, and thus a bending phenomenon caused by a difference in electrode expansion rates in a charging/discharging process is prevented.