Composite Pole Piece Structure Without Adhesive Bonding
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Solution Overview
Problem
The existing methods for forming pole pieces in batteries require the use of adhesives to fix active substances on current collectors, leading to high costs due to the need for increasing adhesive amounts to ensure bonding strength.
Innovation Solution
A composite pole piece is created by fixing active particles in an active layer on a conductive layer using a metal foil layer, eliminating the need for adhesives and reducing production costs while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is used to fix active substance on current collector, then bonding strength is improved, but production cost increases due to high adhesive consumption
Solution Approach 1:
The invention extracts and eliminates the adhesive component from the pole piece structure by using a metal foil layer with mechanical interlocking structure instead, thereby removing the source of high consumption and cost while maintaining bonding function
Solution Approach 2:
The invention changes the bonding mechanism from chemical adhesion to mechanical interlocking by designing a metal foil layer with specific surface structures (protrusions and recesses) that physically anchor the active substance, eliminating the need for adhesive substances
2Strength
If adhesive amount is increased to ensure bonding strength, then adhesive force is improved, but production cost increases
Solution Approach 1:
The invention removes the adhesive substance entirely from the manufacturing process, replacing it with a structurally designed metal foil layer that provides bonding through mechanical interlocking rather than chemical adhesion, thereby eliminating the cost associated with adhesive purchase and application
Solution Approach 2:
The metal foil layer is designed to self-bond with the active substance through its mechanical interlocking structure without requiring any additional bonding agents or adhesives, making the system self-sufficient and eliminating external material dependencies
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
This approach effectively reduces production costs by eliminating adhesive use while ensuring the performance and quality of the pole pieces, facilitating the creation of battery cells with improved efficiency and safety.
Implementation Method 1
the metal foil layer is attached to the conductive layer and configured to fix the plurality of active particles on the conductive layer
Data Source
AI summary
The present disclosure relates to the technical field of batteries. Disclosed are a composite pole piece, a battery cell and a preparation method of the composite pole piece. The composite pole piece includes a supporting layer and an active composite layer. The supporting layer includes an insulating layer and a conductive layer arranged on a side of the insulating layer. The active composite layer is arranged on a side of the conductive layer far away from the insulating layer and includes an active layer and a metal foil layer. The active layer includes a plurality of active particles stacked on the conductive layer, and the metal foil layer is attached to the conductive layer and configured to fix the plurality of active particles on the conductive layer.