Electrode Lead Molding Layout to Prevent Tab Joint Disconnection
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Solution Overview
Problem
The manufacturing process of secondary batteries often results in disconnection at the joint portion between the electrode tab and electrode lead due to tensile stress during the molding process.
Innovation Solution
A manufacturing device and method that involves multiple upper molding molds sequentially fixing and bending the electrode lead, with additional fixing points to distribute and reduce tensile force, including a first and second fixing portion to enhance frictional force and minimize tensile stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fixing mold is used to hold the electrode lead during bending, then the device structure is simple, but tensile stress concentrates at the joint portion causing disconnection
Solution Approach 1:
The patent divides the fixing mold into multiple segments: a first fixing mold that contacts the electrode lead at a first position, and a second fixing mold that contacts the electrode lead at a second position. This segmentation distributes the fixing points along the electrode lead, preventing stress concentration at any single location and reducing the risk of joint disconnection during bending operations.
2Ease of manufacture
If the electrode lead is fixed at one location during bending, then the bending process is simple, but tensile force is concentrated causing disconnection
Solution Approach 1:
The patent implements multiple fixing points along the electrode lead using separate fixing molds. The first fixing mold secures the electrode lead at a first position while the second fixing mold secures it at a second position. This multi-point fixation distributes the mechanical stress during bending, preventing excessive tensile force from concentrating at the vulnerable joint portion between the electrode tab and electrode lead.
3Reliability
If multiple fixing points are used on the electrode lead, then tensile stress is distributed and disconnection is prevented, but the device complexity increases
Solution Approach 1:
The patent divides the electrode lead fixation into multiple segments along its length. By positioning fixing molds at different locations (first position and second position), the system creates discrete fixation zones that independently manage stress distribution. This segmented approach maintains structural simplicity while effectively preventing joint disconnection through distributed stress management.
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 by reducing tensile force applied to the electrode lead and tab through sequential fixing and increased frictional force, ensuring reliable electrical connection.
Implementation Method 1
increased frictional force
Implementation Method 2
sequential fixing and bending
Implementation Method 3
distribute and reduce tensile force
Data Source
AI summary
A manufacturing device of a secondary battery includes an upper fixing mold and a lower fixing mold fixing the electrode lead interposed therebetween, a lower molding mold disposed to be spaced apart from the lower fixing mold toward an outer end portion of the electrode lead, and a plurality of upper molding molds disposed to be spaced apart from the upper fixing mold toward an end portion of the electrode lead. The plurality of upper molding molds include a first upper molding mold for fixing the electrode leads and a second upper molding mold for forming first and second bent portions. The first upper molding mold and the second upper molding mold are separated from each other and are sequentially disposed in a direction from the electrode assembly toward the end portion of the electrode lead. A manufacturing method of a secondary battery is also provided.