Laminated Cell Separator Fold Lines for Electrode Alignment
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Solution Overview
Problem
Thermally-compositing laminated cells face issues with electrode plate misalignment during folding, leading to lithium precipitation, reduced cycle life, and safety risks such as combustion and explosion, due to incomplete intercalation of lithium ions and potential short circuits.
Innovation Solution
Incorporating an incomplete-cut-off structure on the separator's bending portions, allowing the separator to be folded along these structures for precise alignment of electrode plates, thereby preventing short circuits and improving folding quality and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a shaping process with a shaping cylinder is added to improve alignment, then electrode plate alignment is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The incomplete cut-off structure is formed on the separator before the folding process, creating a pre-defined folding line that guides the electrode plates into proper alignment during folding. This preliminary structural preparation eliminates the need for complex shaping cylinders and subsequent alignment adjustments.
Solution Approach 2:
The incomplete cut-off structure on the separator enables the electrode plates to self-align during the folding process without requiring external shaping equipment. The separator's folded structure naturally guides the electrode plates into correct positioning, making the system self-aligning.
2Productivity
If free-falling folding is used to simplify the manufacturing process, then manufacturing efficiency is improved, but electrode plate alignment deteriorates
Solution Approach 1:
The incomplete cut-off structure enables the separator to automatically fold along a predetermined line during the free-falling folding process, causing the electrode plates to self-align without requiring complex guiding mechanisms or reducing folding speed.
Solution Approach 2:
The incomplete cut-off structure on the separator acts as an intermediary element that mediates between the free-falling folding motion and the electrode plate alignment requirement, translating the simple folding motion into precise alignment without requiring complex equipment.
3Reliability
If electrode plates are misaligned during folding, then lithium ion intercalation is incomplete, but adding alignment equipment increases manufacturing complexity
Solution Approach 1:
The incomplete cut-off structure is prepared in advance on the separator to create a predetermined folding line, ensuring that electrode plates will align properly during folding without requiring complex alignment equipment or post-processing adjustments.
Solution Approach 2:
The separator with the incomplete cut-off structure automatically guides the electrode plates into correct alignment during folding, enabling complete lithium ion intercalation without the need for external alignment devices or complex control systems.
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 solution ensures good alignment and reduces lithium precipitation, enhancing the cycle life, fast charging capacity, and safety of the laminated battery cells by fixing the folding position and preventing misalignment.
Implementation Method 1
each of the bending portions is provided with an incomplete-cut-off structure, and the separator is folded at the incomplete-cut-off structure
Implementation Method 2
lithium ions are deintercalated from the positive electrode plate and intercalated in the negative electrode plate
Implementation Method 3
thermally compositing the first electrode plates, the second electrode plates and the separator to form a composite laminate
Data Source
AI summary
A thermally-compositing laminated cell and a preparation method of a thermally-compositing laminated cell are provided. The cell includes a plurality of first electrode plates, a plurality of second electrode plates and a separator. The polarity of each of the first electrode plates and the polarity of each of the second electrode plates are opposite, and the separator includes a plurality of body portions and a plurality of bending portions disposed alternately and continuously. Along a thickness direction of each of the first electrode plates, the first electrode plates and the second electrode plates are alternately stacked, one of the first electrode plates and one of the second electrode plates adjacent to each other are separated by one of the body portions, and each of the bending portions is provided with an incomplete-cut-off structure, and the separator is folded at the incomplete-cut-off structure.