Battery Crimping Support Geometry to Prevent Cap Plate Deformation
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Solution Overview
Problem
The high pressure required for crimping the cap plate in secondary batteries leads to equipment damage and deformation, reducing the safety and quality of cylindrical secondary batteries.
Innovation Solution
A crimping apparatus with a protrusion design that supports the beading portion, controlling the support length and coverage of the crimping portion to reduce shaping load and prevent deformation, using a gasket to insulate the cap plate, and optimizing the engagement thickness and support length of the crimping portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high pressure is applied to shape the crimping portion, then the crimping strength is improved, but the equipment is damaged due to cumulative stress
Solution Approach 1:
The crimping apparatus is divided into multiple functional components: a support unit with protrusions that provide localized support to the beading portion, and a separate crimping unit that applies pressure. This segmentation allows the support unit to bear the cumulative stress while the crimping unit maintains effective crimping force, preventing equipment damage while maintaining crimping strength.
Solution Approach 2:
The support unit with protrusions acts as an intermediary between the crimping portion and the equipment. The protrusions insert into the beading portion to provide intermediate support, distributing the load and preventing direct transmission of cumulative stress to the equipment, thereby protecting equipment durability while maintaining crimping effectiveness.
2Strength
If high pressure is applied to shape the crimping portion, then the crimping strength is improved, but the cap plate is deformed
Solution Approach 1:
The apparatus segments the pressure application function: the support unit with protrusions handles support and load distribution, while the crimping unit applies controlled pressure only where needed. This segmentation prevents excessive pressure from deforming the cap plate while maintaining sufficient crimping strength at the crimping portion.
Solution Approach 2:
The support unit serves as an intermediary structure that distributes the applied pressure. The protrusions insert into the beading portion to provide localized support points, preventing the pressure from being transmitted directly to the cap plate, thereby preventing cap plate deformation while maintaining crimping strength.
3Reliability
If the support length of the protrusion is increased, then the equipment durability is improved, but the device complexity increases
Solution Approach 1:
The support unit employs local quality by providing support only at specific locations where protrusions insert into the beading portion. This localized support approach improves equipment durability by distributing stress at critical points without requiring a complex overall structure, maintaining simplicity while enhancing reliability.
Data Source
AI summary
A crimping apparatus configured to form a crimping portion in a cylindrical secondary battery. The crimping apparatus includes a protrusion configured to be inserted into a beading portion of the cylindrical secondary battery. A support length of the protrusion inserted into the beading portion is approximately 73% to approximately 83% of an indentation depth of the beading portion in an outer diameter direction of the cylindrical secondary battery.