Battery Electrode Assembly Routing With Buffering for Line Stoppages
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Solution Overview
Problem
Secondary battery manufacturing systems face operational challenges due to stoppages and failures in individual processes, leading to difficulties in maintaining smooth operation and productivity, particularly in tab welding, inspection, and packaging units.
Innovation Solution
A secondary battery manufacturing system is designed with a tab welding unit, an inspection unit, and parallel packaging units, along with a buffer unit and control unit to manage the transfer and storage of electrode assemblies, ensuring continuous operation by selectively routing electrode assemblies to operational units and storing them when necessary, thereby stabilizing the production line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequential processes are performed in succession for secondary battery manufacturing, then manufacturing order is maintained, but operation stoppages occur due to failures in individual processes
Solution Approach 1:
The manufacturing system is divided into independent parallel lines (first manufacturing line with first tab welding unit, first inspection unit, first packaging units; second manufacturing line with second tab welding unit, second inspection unit, second packaging units). Each line can operate independently, so when one line stops due to failure, the other line continues production, maintaining overall operation continuity and productivity.
Solution Approach 2:
The system changes the operational state parameters of different manufacturing lines dynamically. When a failure occurs in one line, the control unit adjusts the operational parameters of other lines to compensate, maintaining overall system productivity. The buffer unit also dynamically changes its storage and transfer operations based on the operational status of different lines.
2Reliability
If multiple processes are performed in succession, then complete manufacturing flow is achieved, but smooth operation becomes difficult due to stoppages in individual processes
Solution Approach 1:
The buffer unit acts as an intermediary between the tab welding unit and inspection unit. It temporarily stores transfer cassettes and regulates the flow of electrode assemblies, absorbing variations in process speeds and preventing stoppages from propagating through the system. This mediator enables smooth operation by decoupling the sequential processes.
Solution Approach 2:
The control unit dynamically adjusts the operation of different manufacturing lines and buffer units based on real-time status. When one line experiences issues, the system dynamically reallocates resources and adjusts transfer speeds, making the system adaptable and easy to operate despite process variations.
3Productivity
If parallel packaging units are provided, then productivity is increased, but system complexity increases
Solution Approach 1:
The buffer unit serves multiple functions: it stores transfer cassettes, regulates flow between processes, and dynamically routes electrode assemblies to different packaging units based on operational status. This multi-functional component increases productivity while managing system complexity through a standardized interface.
Solution Approach 2:
The control unit implements feedback control by monitoring the operational status of parallel packaging units and adjusting the supply of electrode assemblies accordingly. When one packaging unit stops, the control unit redirects assemblies to operating units, maintaining high productivity while managing the complexity of parallel operations through automated feedback mechanisms.
Data Source
AI summary
Proposed is a secondary battery manufacturing system including a tab welding unit that performs a welding process on an electrode tab of an electrode assembly and inserts the electrode assembly into a transfer cassette, an inspection unit that inspects the electrode assembly, packaging units provided in parallel for inserting the electrode assembly that has passed the inspection unit into a pouch, a buffer unit that transfers the transfer cassette from the tab welding unit to the inspection unit or stores the transfer cassette, and at least one control unit that controls the electrode assembly supplied from the inspection unit to be selectively supplied to any one packaging unit that operates normally depending on whether the packaging units operate normally, and controls the transfer cassette to be supplied to the inspection unit that operates normally or stored in the buffer unit depending on whether the inspection unit operates normally.