Pouch Battery Transfer Gripping to Prevent Separator Folding
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Solution Overview
Problem
The manufacturing process of pouch type secondary batteries is prone to defects such as separator folding due to electrolyte bias during transfer, which affects the quality of the batteries.
Innovation Solution
A transfer apparatus with accommodation part grippers and frame part grippers that grip the battery case to stabilize the electrode assembly, using cushion and friction pads to prevent electrolyte flow and separator folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the battery case is transferred during the assembly process, then the manufacturing productivity is improved, but the separator may fold due to electrolyte bias
Solution Approach 1:
The gripper units are positioned to grip the battery case before electrolyte injection, establishing stable support points that prevent separator folding during subsequent electrolyte filling and transfer operations
Solution Approach 2:
The battery case acts as an intermediary structure that, when gripped at specific points, mediates between the transfer mechanism and the electrode assembly, preventing direct transmission of forces that could cause separator folding
2Reliability
If the battery case is held firmly during transfer, then the separator folding is prevented, but the device complexity increases
Solution Approach 1:
The gripping mechanism is divided into separate gripper units that independently grip different portions of the battery case, allowing simplified individual components to work together for reliable overall control
Solution Approach 2:
The gripper units serve multiple functions: they grip the battery case for transfer, prevent separator folding through proper positioning, and can be adjusted for different battery case sizes, reducing the need for multiple specialized devices
Data Source
AI summary
A transfer apparatus for a secondary battery in an apparatus for manufacturing the secondary battery includes a pair of accommodation part grippers and a pair of frame part grippers. The secondary battery has an electrode assembly in which an electrode and a separator are alternately stacked and a battery case that accommodates the electrode assembly. The pair of accommodation part grippers grip an accommodation part, in which the electrode assembly is accommodated, of the battery case. The pair of frame part grippers grip a frame part extending from an edge of the accommodation part of the battery case.