Cylindrical Battery Collector Structure for Low-Height Welding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing cylindrical batteries require a welding position and beading portion, increasing the battery housing height and reducing the energy density when assembled into a battery module.
Innovation Solution
A cylindrical battery design with a recessed beading portion forming a protrusion on the inner wall, incorporating a buffer segment that deforms to form a limiting segment, allowing for direct welding without additional processes, thus reducing the battery's overall height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding position and beading portion are reserved in the battery housing, then the structural strength and stability are improved, but the battery housing height is increased
Solution Approach 1:
The patent merges the welding segment and limiting segment into a single integrated structure. The welding segment provides structural strength for welding operations, while the limiting segment ensures proper positioning. By combining these two functions into one component that is directly welded to the housing, the design eliminates the need for separate reserved positions, thereby reducing battery housing height while maintaining structural integrity.
Solution Approach 2:
The second main body portion serves multiple functions: it acts as a welding segment for structural connection, a limiting segment for positioning, and an integrated component that eliminates the need for separate reserved positions. This multi-functional design allows the same structure to provide both strength and positioning without increasing height.
2Stability of the object's composition
If welding position and beading portion are reserved in the battery housing, then the structural stability is improved, but the energy density is reduced
Solution Approach 1:
By merging the welding and limiting functions into a single integrated second main body portion that is directly welded to the housing, the design eliminates the need for separate reserved positions. This reduces the space occupied by non-active components, thereby increasing the proportion of active materials and improving energy density while maintaining structural stability.
Solution Approach 2:
The design extracts the need for separate reserved welding positions and beading portions by integrating these functions directly into the housing structure through the second main body portion. This eliminates wasted space and increases the effective energy storage capacity relative to the total battery volume.
3Manufacturing precision
If additional process is required to form the limiting segment, then the fitting and mounting precision is improved, but the manufacturing complexity is increased
Solution Approach 1:
The second main body portion is pre-formed with both the welding segment and limiting segment integrated into a single component before assembly. This preliminary integration ensures precise fitting and mounting positions are built-in from the start, eliminating the need for additional post-assembly processes while reducing manufacturing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design reduces the battery height by eliminating the need for reserved welding positions, enhancing structural rigidity and stability while maintaining effective welding, thereby improving energy density.
Implementation Method 1
the buffer segment is able to be bent and deformed as the beading portion is recessed inwards; when the beading portion is recessed towards the accommodating cavity so that an inner side wall of the housing forms the protrusion correspondingly, the protrusion pushes the buffer segment such that the buffer segment is bent inwards and deformed to form the limiting segment
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to the technical field of batteries, and in particular to a cylindrical battery, including: a housing (1), provided with an opening and an accommodating cavity for accommodating a cell; a first current collector, arranged in the accommodating cavity, and the first current collector includes a first main body portion (21) and a second main body portion, the first main body portion is connected to the cell, and the second main body portion is connected to the housing; a side wall of the housing is provided with a beading portion (12), which is recessed towards the accommodating cavity to form a first groove (16) on an outer wall of the housing, and correspondingly form a protrusion (13) on an inner wall of the housing, at least a part (24,25) of the second main body portion extends from an edge of the first main body portion to the protrusion and covers the protrusion.