Laminated Battery Cell Folding Lines for Electrode Alignment
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Solution Overview
Problem
Laminated battery cells face issues with poor alignment during manufacturing, leading to lithium precipitation, reduced service life, and safety hazards such as combustion and explosion, due to misalignment of positive and negative electrode sheets.
Innovation Solution
A method involving thermally bonding negative and positive electrode sheets to a membrane, forming folding structures, and folding along these structures to ensure precise alignment, eliminating the need for additional shaping equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrode sheets are folded in a free-fall manner during manufacturing, then the manufacturing process is simple, but the alignment of positive and negative electrode sheets deteriorates
Solution Approach 1:
The method pre-sets folding lines on the electrode sheets before the folding process. These folding lines are marked during the assembly process where electrode sheets are stacked and bonded, establishing precise fold positions in advance. This preliminary action ensures that subsequent folding operations maintain accurate alignment between positive and negative electrode sheets without requiring complex real-time control during folding.
Solution Approach 2:
The patent introduces folding lines as an intermediary element that mediates between the simple free-fall folding process and the requirement for precise alignment. These folding lines serve as physical guides that direct the folding process along predetermined paths, ensuring that electrode sheets fold at the correct positions while maintaining the simplicity of the free-fall folding method.
2Manufacturing precision
If a shaping process with shaping cylinders is used to improve alignment, then the alignment of electrode sheets improves, but the risk of powder falling and short circuits increases
Solution Approach 1:
The patent extracts and eliminates the shaping cylinder process from the manufacturing sequence. Instead of using mechanical shaping cylinders that can dislodge powder, the method relies on pre-marked folding lines and a controlled free-fall folding process. This removal of the shaping step eliminates the harmful effect of powder falling while still achieving alignment through the predetermined folding lines.
Solution Approach 2:
The patent replaces the mechanical shaping cylinder system with a marking and free-fall folding system. Instead of using mechanical force from shaping cylinders to achieve alignment, the method uses pre-marked folding lines as guides and allows the material to fold naturally under controlled conditions, reducing mechanical disturbance that could cause powder to fall.
3Adaptability or versatility
If folding positions are not fixed, then the folding process is flexible, but the alignment of the laminated battery cell deteriorates
Solution Approach 1:
The patent establishes fixed folding positions through preliminary marking of folding lines on the electrode sheets. These lines are marked at specific locations during the assembly process, creating predetermined fold positions that ensure consistent alignment. This preliminary fixation of folding positions maintains manufacturing precision while allowing the folding process itself to remain flexible and adaptable.
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
Improves alignment, reduces lithium precipitation, enhances electrical performance in terms of service life and fast charging capacity, and increases safety by fixing folding positions and strengthening structural integrity.
Implementation Method 1
thermally bonding the positive electrode sheet and the negative electrode sheet to the membrane to form a thermally bonded structure
Data Source
AI summary
A method for preparing a laminated battery cell is provided. The method comprises steps of: providing a negative electrode sheet, a positive electrode sheet, and a membrane; thermally bonding the negative electrode sheet and the positive electrode sheet to the membrane to form a thermally bonded structure; forming a plurality of folding structures in the thermally bonded structure, wherein i positive electrode sheets are arranged between every two adjacent folding structures, and i is a positive integer; folding the thermally bonded structure along each straight line where each of the folding structures is located to prepare the laminated battery cell. In the present disclosure, the folded position is fixed, so that the alignment of the positions on both sides of each electrode sheet during folding is improved, and subsequent investment and process of a shaping equipment are eliminated.