Cylindrical Battery Crimping Support to Prevent Cap Plate Deformation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The high pressure required for crimping cylindrical secondary batteries leads to equipment damage and cap plate deformation, reducing safety and quality.
Innovation Solution
A crimping apparatus with a protrusion inserted into the beading portion, supporting the beading portion at 73% to 83% of the indentation depth, reduces shaping load and prevents cap plate deformation by shifting the force point during crimping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high pressure is applied for crimping, then the crimping portion is properly formed, but the cap plate deforms and equipment is damaged
Solution Approach 1:
A protrusion is introduced as an intermediary element that inserts into the beading portion to provide internal support during crimping. This mediator distributes the crimping force and prevents direct transmission of high pressure to the cap plate, thereby forming the crimping portion properly while preventing cap plate deformation
Solution Approach 2:
The protrusion is positioned in advance within the beading portion before crimping begins. This preliminary positioning ensures that the support structure is already in place to prevent deformation when the crimping force is applied, rather than attempting to correct deformation after it occurs
2Manufacturing precision
If high pressure is applied for crimping, then the crimping portion is properly formed, but the equipment suffers cumulative stress damage
Solution Approach 1:
The protrusion acts as a force-distributing intermediary that reduces the peak stress transmitted to the equipment. By providing internal support through the beading portion, it allows crimping to be performed at lower overall pressures, reducing cumulative stress on the crimping equipment while still achieving proper crimping portion formation
Solution Approach 2:
The introduction of the protrusion changes the pressure distribution parameters during crimping. Instead of applying high pressure directly to the cap plate, the pressure is redistributed through the beading portion and protrusion structure, achieving the same crimping effect at lower peak pressures and reducing equipment stress
3Device complexity
If the protrusion support length is too short, then the equipment structure is simpler, but the cap plate deforms under crimping pressure
Solution Approach 1:
The support length of the protrusion is optimized to a specific parameter range (73%-83% of the beading portion depth) to achieve the minimum effective length that prevents cap plate deformation. This parameter optimization ensures adequate support function while minimizing the protrusion dimensions and overall device complexity
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A crimping apparatus configured to form a crimping portion (124) in a cylindrical secondary battery (10). The crimping apparatus includes a protrusion (1a) configured to be inserted into a beading portion (122) of the cylindrical secondary battery (10). A support length (L3) of the protrusion (1a) inserted into the beading portion (122) is approximately 73% to approximately 83% of an indentation depth (L4) of the beading portion (122) in an outer diameter direction of the cylindrical secondary battery (10).