Compound Electrode Sheet Structure for Slip-Free Battery Lamination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium-ion battery assembly faces issues with electrode sheet misplacement during lamination, leading to reduced capacity, safety concerns, and decreased production efficiency due to lack of extrusion pressure between electrode sheets and isolation films, which can cause short circuits and deformation.
Innovation Solution
A compound electrode sheet design featuring current collectors with protrusion portions that are fixedly connected, either through adhesive layers or welding, to prevent slipping and ensure proper alignment without the need for complex fixtures, enhancing safety and production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrode sheets are laminated without extrusion pressure, then the lamination process is simple, but the electrode sheets and isolation film are prone to misplacement and sliding
Solution Approach 1:
The protrusion portions are pre-formed on the current collectors before lamination, creating built-in alignment features that guide the electrode sheets into correct positions during the lamination process, preventing misplacement without requiring complex fixtures
Solution Approach 2:
The protrusion portions act as intermediary elements between the current collectors and isolation films, providing mechanical interlocking and positioning features that ensure proper alignment during lamination without requiring external fixtures or excessive pressure
2Manufacturing precision
If complex fixtures are used to control electrode sheet positions, then alignment accuracy is improved, but production efficiency decreases and manual operation is required
Solution Approach 1:
The current collectors are designed with self-aligning protrusion portions that automatically guide the electrode sheets into correct positions during lamination, eliminating the need for complex external fixtures and manual positioning operations
Solution Approach 2:
The protrusion portions create asymmetric structural features on the current collectors that provide directional guidance and mechanical interlocking, ensuring proper alignment through the inherent structural design rather than symmetric fixtures
3Shape
If electrode sheets are bent during winding, then wound cell structure is formed, but stress concentration occurs at bent locations causing deformation
Solution Approach 1:
The current collectors are divided into main body portions and separate protrusion portions, allowing the protrusion portions to be positioned at bent locations to provide structural support and distribute stress, preventing deformation at stress concentration points
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 compound electrode sheet effectively alleviates relative slipping during assembly, improves safety by maintaining the safety size of the negative electrode sheet, and increases production efficiency by eliminating the need for complex fixtures and manual adjustments.
Implementation Method 1
the protrusion portions of two current collectors are fixedly connected, either through adhesive layers or welding
Implementation Method 2
the protrusion portions of two current collectors are fixedly connected, either through adhesive layers or welding
Data Source
AI summary
A compound electrode sheet includes two single electrode sheets, and each single electrode sheet includes a current collector and an active material layer. The current collector is provided with a main body and a protrusion portion, and the protrusion portion is arranged protruding out of the main body in an extension direction of the current collector. The active material layer is arranged on a surface of the main body. The protrusion portions of the two current collectors of the two single electrode sheets are fixedly connected. The active material layers of the two single electrode sheets are arranged opposite to each other.