Secondary Battery Laminating Device Stepped Bonding Part
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing secondary battery laminating devices using indirect heating methods face inefficiencies in bonding electrode assemblies to separators due to non-uniform pressure application, leading to defects in bonding force and durability.
Innovation Solution
A secondary battery laminating device with a bonding part having stepped surfaces to uniformly apply pressure and heat across the electrode assembly and separator, ensuring consistent bonding by contacting the electrode tab, electrode surface, and separator surface simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a flat contact surface bonding part is used, then the bonding process can be performed, but non-uniform pressure distribution occurs leading to defective bonding force
Solution Approach 1:
The bonding part is designed with a stepped contact surface that has different heights corresponding to different regions of the electrode assembly. The first stepped contact surface contacts the electrode tab at a higher position, the second stepped contact surface contacts the electrode body at an intermediate position, and the third stepped contact surface contacts the separator at a lower position. This local differentiation in contact surface height ensures uniform pressure distribution across all components despite their varying thicknesses, resolving the contradiction between achieving bonding and maintaining bonding quality.
2Productivity
If indirect heating method is used, then the heating process can be performed, but the heating time is excessively long
Solution Approach 1:
The patent replaces the indirect heating method (which uses radiation and convection) with a direct contact heating method. The bonding part serves as both a pressing mechanism and a heating element, making direct thermal contact with the electrode assembly. This substitution of heating mechanism dramatically reduces heating time while maintaining bonding effectiveness, resolving the contradiction between productivity and time consumption.
3Productivity
If contact-type heating is used, then the heating efficiency is improved, but non-uniform pressure application occurs due to electrode assembly thickness variation
Solution Approach 1:
The bonding part incorporates a stepped contact surface structure with three distinct levels. The first stepped contact surface is positioned to contact the electrode tab, the second stepped contact surface contacts the electrode body, and the third stepped contact surface contacts the separator. This local differentiation in contact surface height ensures that each component receives appropriate pressure despite variations in thickness, maintaining uniform pressure distribution while utilizing efficient contact-type heating.
4Device complexity
If a simple flat bonding structure is used, then the device complexity is reduced, but bonding between electrode tab and separator does not occur properly
Solution Approach 1:
The bonding part features a stepped contact surface with three distinct levels tailored to match the different heights of electrode components. The first stepped contact surface contacts the electrode tab, the second contacts the electrode body, and the third contacts the separator. This structured differentiation ensures comprehensive bonding across all components while maintaining reasonable device complexity through integration into a single bonding part.
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 ensures a uniform and firm bonding of the electrode assembly to the separator, enhancing the durability of both components and improving the overall bonding process.
Implementation Method 1
a bonding part (120) disposed on a transfer path of the transfer part to contact an entire surface of the electrode assembly (10) and apply heat to the electrode assembly (10), thereby bonding the electrode assembly (10) to the separator (20)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to a secondary battery laminating device, the secondary battery laminating device for bonding an electrode assembly and a separation membrane according to the present invention comprising: a transfer part for transferring the electrode assembly in a state of being disposed on the separation membrane; and a bonding part disposed on the transfer path of the transfer part for bonding the electrode assembly on the separation membrane by coming into contact with the entire surface of the electrode assembly and applying heat to same. Accordingly, pressure is evenly applied to the electrode assembly enabling the firm bonding of same to the separation membrane, thereby providing a secondary battery laminating device which may produce a secondary battery having excellent durability.