Electrode Stacking Structure Without PET Film Carriers
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Solution Overview
Problem
The existing stacking devices for manufacturing stacked type electrode assemblies are complex and result in significant material waste, increasing the manufacturing cost due to the complicated attachment process of negative electrode sheets, separators, and positive electrode sheets.
Innovation Solution
A simplified stacking device structure that includes a negative delivery mechanism, a separator delivery mechanism, and a positive delivery mechanism, with heating mechanisms to soften adhesives on the separators and electrode sheets, allowing direct bonding and eliminating the need for PET films, thereby reducing material waste and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PET films are used to fix positive electrode sheets during delivery, then the positive electrode sheets can be transported without shifting, but the device structure becomes more complex and material waste increases
Solution Approach 1:
The patent removes the PET film feeding apparatus from the stacking device structure. Instead of using PET films to transport and position positive electrode sheets, the invention directly bonds positive electrode sheets to separators through heating and adhesive softening, eliminating the intermediate PET film transport mechanism and its associated complexity
Solution Approach 2:
The patent uses heating mechanisms to soften adhesives on separators as an intermediary method to achieve bonding between positive electrode sheets and separators. This thermal mediation replaces the mechanical mediation of PET films, allowing direct attachment without intermediate transport layers
2Productivity
If PET films are used to transport positive electrode sheets, then the sheets can be delivered to the next station, but material waste increases and production cost rises
Solution Approach 1:
The patent eliminates the PET film consumable from the production process. By directly bonding positive electrode sheets to separators through heated adhesive softening, the system removes the need for PET films that would otherwise be wasted after serving their temporary transport function
Solution Approach 2:
The separators themselves serve the dual function of both structural components and transport carriers. The adhesive on the separators enables self-bonding of positive electrode sheets directly to the separators, which then transport the assembled units without requiring external PET film carriers
3Manufacturing precision
If heating mechanism is placed upstream before separator delivery, then heat can be applied to soften adhesives, but the heat path is longer and bonding effectiveness is reduced
Solution Approach 1:
The heating mechanism is positioned downstream after separators are delivered and positioned on the negative electrode sheet. This timing allows the adhesives to be softened at the optimal moment when separators are in their final bonding position, eliminating the need for long heat paths through multiple layers and ensuring precise thermal application where needed
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 simplifies the stacking device structure, reduces material waste, and enhances the attachment quality of electrode assemblies by ensuring stronger bonding properties, leading to lower production costs and improved efficiency.
Implementation Method 1
the first heating mechanism is arranged downstream of the separator delivery mechanism and configured to heat the negative electrode sheet and the separators
Implementation Method 2
the first heating mechanism can heat the negative electrode sheet and the separators that are arranged in a laminated manner before the positive electrode sheets are attached to the separators, so as to soften glue or adhesives on surfaces of the separators
Implementation Method 3
no PET film is provided, which also shortens the path through which heat passes, and has a stronger ability to soften the glue or adhesives on the separators
Data Source
AI summary
A stacking device may include a negative delivery structure, a separator delivery structure, a first heater and a positive delivery structure. The negative delivery structure may be configured to deliver a negative electrode sheet. The separator delivery structure may be configured to deliver separators to two sides of the negative electrode sheet such that the separators are attached to the negative electrode sheet. The first heater may be arranged downstream of the separator delivery structure and configured to heat the negative electrode sheet and the separators. The positive delivery structure may be arranged downstream of the first heater and configured to deliver positive electrode sheets to the two sides of the negative electrode sheet such that the positive electrode sheets are attached to the separators.