Secondary Battery Lead Tab Bending to Eliminate Spring Back
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Solution Overview
Problem
The challenge lies in efficiently connecting multiple secondary battery cells within a limited space while minimizing volume and addressing the spring back phenomenon of electrode tabs due to their material properties, which can lead to equipment collisions and reduced assemblability during the bending process.
Innovation Solution
A lead tab bending device and method that utilizes a first guide, a base block, and a bending jig with an arc-shaped second guide to perform primary and secondary bending of lead tabs, ensuring they overlap and securely connect without spring back, thereby enhancing assemblability and preventing equipment collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrode tabs are bent to connect multiple secondary battery cells in a limited space, then assemblability and volume efficiency are improved, but spring back phenomenon occurs due to material elasticity causing bending angle deviation and potential equipment collision
Solution Approach 1:
The bending device performs preliminary bending of the electrode tab to a first bending angle, then performs a second bending to a final angle. This two-stage preliminary action approach allows the material to gradually adapt to the bending stress, reducing spring back effect and achieving more precise final bending angle while maintaining good assemblability
Solution Approach 2:
The invention changes the bending parameters by implementing different bending angles in two stages: a first bending angle followed by a second bending angle. This parameter change strategy allows optimization of the bending process to minimize spring back while achieving the desired final configuration for proper cell connection
2Volume of stationary object
If electrode tabs are bent to overlap adjacent tabs for compact arrangement, then volume of secondary battery cell is reduced, but equipment collision may occur during the bending process
Solution Approach 1:
The bending device incorporates a movable base block that can dynamically adjust its position along a guide rail. This dynamic positioning allows the bending jig to approach the electrode tab from optimized angles and distances, enabling compact tab arrangement while maintaining safe clearance from surrounding equipment throughout the bending process
3Productivity
If maximum number of secondary battery cells are arranged in the same volume, then capacity versus volume is improved, but space for accommodating cells and conductors is reduced
Solution Approach 1:
The bending device enables electrode tabs to be bent into nested or overlapping configurations where tabs from adjacent cells are arranged in a compact manner. This nesting approach allows maximum number of cells to be accommodated in limited volume while maintaining necessary space for conductor connection through precise tab positioning
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 effectively secures efficient electrical connection of multiple secondary battery cells in a compact space, reduces spring back, and improves manufacturing stability and productivity by ensuring precise and automated bending of lead tabs.
Implementation Method 1
the generally configured electrode tab are made of a material that may not completely remove the elasticity of the material even when a force below or above the elastic limit is applied, and thus, even if the bending is performed at a desired angle or more, the phenomenon in which the material is restored to its original state may occur
Implementation Method 2
the phenomenon in which the material is restored to its original state may occur, and this phenomenon is called spring back
Data Source
AI summary
The present invention relates to a lead tab bending device of a secondary battery cell capable of preventing a collision with equipment while eliminating a spring back phenomenon in bending the lead tab, and a bending method using the same. More specifically, a lead tab bending device of a secondary battery cell for bending the lead tab protruding from the secondary battery cell includes: a first guide having an extended length; a base block that moves linearly along the first guide; a second guide that is formed on one side of the base block and has an arc shape; and a bending jig that moves along the second guide and bends the lead tab, in which a center of a radius of rotation of the bending jig is formed on one side of the base block, and the bending jig rotates while the center is fixed.