Button Lithium-Ion Battery Composite Flat Sheet Winding
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Solution Overview
Problem
Conventional methods for producing steel housing button lithium ion batteries face issues such as misalignment during the winding process, leading to quality problems, increased labor costs, and risks of low-voltage short circuits due to burrs and exposure to dust and water vapor.
Innovation Solution
A method involving the sequential stacking and hot-lamination of a first separator, a positive piece, and a negative piece to form a composite flat sheet, which is then wound into a cell, reducing misalignment and eliminating the need for die cutting, thereby improving efficiency and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional winding method with separate pieces is used, then flexibility in assembly is maintained, but misalignment occurs leading to quality issues
Solution Approach 1:
The patent merges the separator and electrode pieces into a single integrated structure by hot-laminating the separator onto the electrode pieces, forming a composite flat sheet. This eliminates the need for separate handling and winding of multiple components, thereby preventing misalignment and quality issues while simplifying the overall process.
Solution Approach 2:
The separator is pre-laminated onto the electrode pieces before the winding process. This preliminary action ensures that all components are already precisely aligned and integrated, eliminating alignment issues during winding and reducing the complexity of the winding process itself.
2Manufacturing precision
If manual handling of pieces is increased, then assembly flexibility is maintained, but exposure to dust and water vapor increases affecting quality
Solution Approach 1:
By combining multiple components into a single integrated composite flat sheet through hot-lamination, the patent reduces the number of handling operations required. This minimizes exposure to dust and water vapor while maintaining ease of operation, as the integrated structure can be handled as a single unit throughout the winding process.
3Productivity
If conventional winding efficiency is used, then process simplicity is maintained, but labor costs increase due to low efficiency
Solution Approach 1:
The integration of separator and electrode pieces into a composite flat sheet streamlines the winding process, allowing for faster and more efficient winding operations. This reduces labor time and costs while maintaining manufacturing simplicity, as the pre-integrated structure requires less manipulation during winding.
4Reliability
If die cutting process is used, then piece separation is achieved, but burr generation occurs causing short circuit risks
Solution Approach 1:
The separator is pre-laminated onto the electrode pieces before any cutting operations. This preliminary action ensures that the components are securely integrated, and subsequent cutting can be performed without generating burrs that could cause short circuits. The integrated structure allows for cleaner cutting edges and reduced risk of harmful burrs.
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 enhances winding efficiency, reduces the risk of misalignment and exposure to contaminants, and minimizes the generation of burrs, resulting in improved battery quality and reduced labor costs.
Implementation Method 1
a first separator, a positive piece, a second separator and a negative piece are sequentially stacked and hot-laminated to form an integrated structure
Implementation Method 2
hot-lamination is conducted at a temperature of 45 ̃85° C.
Data Source
AI summary
The invention relates to a button lithium ion battery, a preparation method thereof, and a method of producing a lithium ion cell composite flat sheet, wherein the button lithium ion battery comprises a battery housing, a cell accommodated in the battery housing and an electrolyte filled in the battery housing; the cell is formed by winding a composite flat sheet in which a first separator, a positive piece, a second separator and a negative piece are sequentially stacked and hot-laminated to form an integrated structure. The cell of the button lithium ion battery is formed by winding a composite flat sheet, so that winding efficiency can be improved, and misalignment can be avoided; moreover, chances of hand contact can be reduced, the influence of dust and water vapor can be avoided, and the quality of the lithium battery can be improved to the maximum extent.