Electrode Body Lamination via Electrostatic Attraction
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Solution Overview
Problem
The existing manufacturing method for electrode bodies in secondary batteries, such as lithium ion batteries, requires a time-consuming process for applying bonding layers to the positive and negative electrode plates and separators, leading to longer production times and increased costs.
Innovation Solution
A method involving electrical charging of at least one electrode plate and separator to generate an attraction force via static electricity, allowing for direct contact and attachment during lamination, thereby simplifying the stacking process and reducing manufacturing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bonding layers are provided on the separator surfaces before lamination, then the electrode plates and separator can be attached, but the manufacturing time increases
Solution Approach 1:
The patent replaces the chemical bonding mechanism (bonding layers) with an electrostatic attraction mechanism. By charging the separator and/or electrode plates to generate electrostatic attraction forces, the attachment is achieved without requiring bonding layers, thus eliminating the time-consuming bonding layer formation process while maintaining reliable attachment.
Solution Approach 2:
The patent changes the physical state of the separator and/or electrode plates by charging them to specific electric potentials. This parameter change (from neutral to charged state) enables the generation of electrostatic attraction forces, allowing attachment to occur rapidly without bonding layers, thereby reducing manufacturing time while ensuring reliable attachment.
2Reliability
If bonding layers are used to attach electrode plates and separator, then attachment is achieved, but the process becomes more complex
Solution Approach 1:
The patent substitutes the complex multi-step bonding layer formation process with a simpler electrostatic charging and attraction process. Instead of applying, drying, and curing bonding layers, the invention charges the separator and/or electrode plates to generate electrostatic attraction, significantly simplifying the attachment process while maintaining reliable attachment strength.
Solution Approach 2:
The patent extracts and removes the bonding layer component from the attachment process. By eliminating the bonding layers entirely and relying solely on electrostatic attraction between charged surfaces, the process complexity is reduced while the attachment function is maintained through the electrostatic force mechanism.
3Productivity
If electrode plates and separator are laminated without bonding layers, then manufacturing time is reduced, but attachment reliability decreases
Solution Approach 1:
The patent changes the physical parameter of the electrode plates and separator by charging them to generate electrostatic attraction forces. This parameter change enables direct lamination without bonding layers, achieving both rapid manufacturing (high productivity) and reliable attachment through the electrostatic force between charged surfaces.
Solution Approach 2:
The patent replaces the mechanical/chemical bonding system (bonding layers) with an electrostatic field-based attachment system. This substitution allows for rapid direct lamination of electrode plates and separator while maintaining attachment reliability through electrostatic attraction, thus achieving both high productivity and reliable attachment simultaneously.
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 enables the rapid and cost-effective assembly of electrode bodies with enhanced peel strength, preventing separation and ensuring reliable attachment of electrode plates and separators, thus improving production efficiency and battery performance.
Implementation Method 1
at least one of the first electrode plate and the separator is charged to an electric potential enough to generate an attraction force between the first electrode plate and the separator
Data Source
AI summary
A method of manufacturing an electrode body includes a charging step, a first laminating step, and a second laminating step to manufacture the electrode body by laminating positive and negative electrode plates by interposing a separator therebetween. In the charging step, one of the positive and negative electrode plates is a first electrode plate and an other one is a second electrode plate, and one of the first electrode plate and the separator is charged to a potential enough to generate an attraction force between the first electrode plate and the separator. The first laminating step includes bringing the first electrode plate and the separator, at least one of which is charged, into direct contact to attach each other to form a laminated body. In the second charging step, the second electrode plate is laminated on the laminated body to form the electrode body.