Battery Electrode Notching with Segmented Punch Holes
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Solution Overview
Problem
The existing notching processes for secondary battery electrodes often result in defects such as sticking or burrs, which can compromise the quality and performance of the batteries.
Innovation Solution
A notching apparatus is designed with a lower body to support the electrode plate, an upper body with a punch, and a die with specific punch holes and extensions to prevent sticking and burrs by optimizing the cutting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional single punch hole is used for notching the electrode plate, then the cutting process is simple, but defects such as sticking or burrs occur during punching
Solution Approach 1:
The single punch hole is divided into three separate punch holes (first, second, and third punch holes) arranged sequentially in the first direction. Each punch hole processes a different section of the second area, cutting it into multiple portions. This segmentation prevents sticking and burrs by ensuring that not all sections are cut simultaneously, allowing material to remain connected in certain areas during the punching process.
2Productivity
If the electrode plate is fully cut into separate sections, then the notching is complete, but sticking occurs between cut portions
Solution Approach 1:
The first, second, and third punch holes are arranged to cut different sections of the second area in a sequential manner. The punching process is designed so that portions of the electrode plate remain connected during intermediate stages. Specifically, the first punch hole cuts a first section, the second punch hole cuts a second section, and the third punch hole cuts a third section, with each cutting operation performed at different times or positions, preventing complete separation that would cause sticking.
3Manufacturing precision
If multiple punch holes are used to prevent sticking, then cutting quality improves, but the apparatus complexity increases
Solution Approach 1:
The die is designed as a single integrated component that houses all three punch holes (first, second, and third punch holes) and multiple extensions (first through fourth extensions). This unified die structure performs multiple cutting functions simultaneously through its different punch holes, eliminating the need for separate punching operations or multiple dies. The extensions provide additional support and guidance functions, making the single die structure highly versatile and reducing overall apparatus complexity despite the multiple punch holes.
Data Source
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AI summary
A notching apparatus for a secondary battery includes a lower body configured to support an electrode plate which comprises a first area coated with an active material and a second area not coated with the active material and is transferred in a first direction, an upper body installed to vertically move above the lower body, a die installed on the lower body and arranged to face the second area, a punch hole formed by passing through the die and comprising a first punch hole, a second punch hole, and a third punch hole, which are sequentially arranged in the first direction, and a punch installed on the upper body, inserted into the punch hole as the upper body moves downward, and configured to cut the second area.