Pouch Battery Unit Cell Adhesive Layout for Stack Alignment
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Solution Overview
Problem
In the manufacturing of pouch-type battery cells, the stacking process of electrode assemblies can lead to misalignment and breakage due to shifting of separators or electrodes, causing adhesive strength inconsistencies and deformation.
Innovation Solution
A unit cell design utilizing a first adhesive part with lower shear strength and a second adhesive part with higher shear strength, composed of specific adhesive compositions, is applied between electrodes and separators to stabilize the stack, minimizing movement and breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat and pressure are applied to fix components via stacking device, then components are fixed to each other, but separator or electrode may shift out of place causing breakage and adhesive strength differences
Solution Approach 1:
The adhesive composition is applied to the separator and electrode surfaces before the stacking process. This preliminary bonding action secures the components in place prior to heat and pressure application, preventing shift and breakage during stacking while ensuring uniform adhesive strength distribution
Solution Approach 2:
The adhesive composition acts as an intermediary substance between the separator and electrode, creating a bonding layer that holds components together during the stacking process. This intermediary layer prevents direct contact and potential damage between rigid components while maintaining precise alignment
2Ease of manufacture
If conventional lamination using heat and pressure is used, then components are fixed, but deformation and breakage occur due to shifting
Solution Approach 1:
The adhesive composition is applied in advance to the separator and electrode surfaces before stacking. This preliminary bonding prevents component shifting and breakage during the subsequent heat and pressure lamination process, maintaining component integrity while preserving manufacturing simplicity
Solution Approach 2:
The adhesive composition provides a cushioning effect by creating a compliant bonding layer between components. This cushioning protects against deformation and breakage during the stacking process while maintaining the overall simplicity of the manufacturing process
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 adhesive composition effectively stabilizes the electrode and separator interfaces, reducing deformation and breakage, ensuring uniform thickness and improved space efficiency in the battery cell.
Implementation Method 1
a unit cell configured to adhere an electrode to a separator as well as a separator to a separator using an adhesive composition
Data Source
AI summary
A unit cell includes an electrode positioned between a first separator and a separator in a stack. A first adhesive is positioned between the electrode and at least one of the first and second separators, and a second adhesive is positioned between the first separator and the second separator. A shear strength of the first adhesive is less than or equal to a shear strength of the second adhesive.