Pouch Film Embossing for Reliable Vision Alignment in Battery Cells
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Solution Overview
Problem
The existing pouch forming apparatuses face challenges in accurately forming and recognizing the embossed parts on pouch films due to inconsistent hole formation during the piercing process, leading to reduced vision recognition rates and alignment issues when changing molds.
Innovation Solution
The method involves forming embossed parts on pouch films using an embossing punch part, with a vision recognition step for both inner and outer circular shapes based on punched recessed parts, and using a blank holder to ensure a flat bottom surface during the forming process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If holes are formed in the pouch film by a piercing process to specify position, then position specification is achieved, but holes cannot be pierced intermittently which reduces manufacturing reliability
Solution Approach 1:
The patent extracts the position specification function from the piercing process and transfers it to the embossed part formation process. The embossed parts with recessed portions serve as the new reference markers, eliminating the need for hole piercing while maintaining position specification capability. This resolves the contradiction by removing the unreliable piercing step while preserving the positioning function.
Solution Approach 2:
The embossed parts with recessed portions are formed in advance during the pouch film forming process, before any subsequent operations. These pre-formed embossed parts serve as reliable reference markers for position specification, eliminating the need for intermittent hole piercing and ensuring consistent positioning throughout manufacturing.
2Manufacturing precision
If the pouch film is pressed with the pressing part to form the electrode assembly-receiving part, then the receiving part is formed, but alignment issues occur when changing molds due to inconsistent hole formation
Solution Approach 1:
The embossed parts with recessed portions serve multiple functions: they form the electrode assembly-receiving part structure and simultaneously provide alignment reference markers. This multi-functionality ensures that the same embossed features used for forming the receiving part also provide consistent alignment references across different molds, resolving the adaptability issue when changing molds.
Solution Approach 2:
The embossed parts create a standardized pattern of recessed portions that can be replicated across different molds. This copying of the embossed pattern ensures that alignment references are consistent regardless of which mold is used, enabling seamless mold changes while maintaining manufacturing precision.
3Measurement precision
If vision recognition is performed on the pouch film, then position detection is achieved, but the recognition rate decreases when holes are not consistently formed
Solution Approach 1:
The patent extracts the vision recognition target from the holes and relocates it to the embossed parts with recessed portions. The embossed parts provide a consistent, reliable visual target for recognition systems, eliminating the variability introduced by inconsistent hole formation and thereby improving both recognition rate and reliability.
Solution Approach 2:
The embossed parts with recessed portions create distinct visual features through their three-dimensional structure and light reflection properties. These visual characteristics provide a consistent and reliable target for vision recognition systems, unlike the variable appearance of pierced holes, thereby improving recognition accuracy and consistency.
Data Source
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AI summary
A method of manufacturing a pouch type battery cell according to an embodiment of the present disclosure includes forming an embossing part in a part of a pouch film by using an embossing punch part.