Secondary Battery Electrode Lead Rolling to Prevent Joint Disconnection
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Solution Overview
Problem
Existing methods for forming electrode leads in secondary batteries suffer from disconnection at the joint region due to tensile stress and are limited in shaping versatility, requiring multiple molds for different product types.
Innovation Solution
A device with independently rotating upper and lower roller molds minimizes tensile force by forming electrode leads using a single manufacturing device, allowing various shapes without additional molds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fixed upper and lower molds are used to form electrode leads, then the manufacturing process is simple, but strong tensile force is applied to the joint portion causing disconnection
Solution Approach 1:
The patent applies the dynamics principle by replacing fixed molds with roller molds that can rotate. The roller molds (upper roller mold and lower roller mold) rotate in the same direction during the forming process, which dynamically transforms the electrode lead rather than applying static pressing force. This rotation reduces friction and tensile stress on the joint portion, preventing disconnection while maintaining manufacturing simplicity.
2Adaptability or versatility
If multiple fixed molds are used for different product shapes, then each product type can be manufactured, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies the universality principle by designing roller molds that can form various electrode lead shapes using a single device. The upper and lower roller molds can be adjusted to different positions and rotation speeds, enabling the same mold set to produce different electrode lead configurations (e.g., different bend radii, angles, and positions). This eliminates the need for multiple dedicated molds for different product types, reducing device complexity and manufacturing cost.
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
Prevents disconnection at the joint region and enables flexible shaping of electrode leads, reducing manufacturing costs by eliminating the need for multiple molds.
Implementation Method 1
the roller molds may rotate, thereby minimizing frictional force with the electrode lead and, consequently, minimizing tensile force
Data Source
AI summary
A manufacturing device of a secondary battery according to an exemplary embodiment of the present disclosure, as a manufacturing device of a secondary battery including a plurality of electrodes and separators stacked alternately, electrode tabs provided at ends of the plurality of electrodes, and an electrode lead coupled to the electrode tabs, includes an upper fixing mold and a lower fixing mold fixing the electrode lead interposed therebetween, a plurality of lower roller molds arranged to be spaced apart from the lower fixing mold toward an outer end of the electrode lead, and a plurality of upper roller molds arranged to be spaced apart from the upper fixing mold toward the outer end of the electrode lead.