Cylindrical Cell Welding Rod Structure to Protect Electrode Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing welding methods for cylindrical battery cells risk damaging the electrode assembly or separator due to friction and high-temperature contact during the welding process, particularly when joining the electrode tab to the battery can.
Innovation Solution
A welding device with a center rod and exterior cover that expands the winding center hole, minimizing direct contact and friction by using a lower thermal conductivity exterior cover to shield the electrode assembly from high-temperature welding rods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a welding rod is inserted into the winding center hole to weld the electrode tab to the battery can, then welding strength is improved, but the electrode assembly or separator may be damaged due to friction and high-temperature contact
Solution Approach 1:
An exterior cover is introduced as an intermediary component between the welding rod and the electrode assembly. The exterior cover is inserted into the winding center hole first, creating a protective barrier that prevents direct contact between the welding rod and the electrode assembly/separator during the welding process, thereby eliminating friction damage and high-temperature contact damage while still allowing the welding rod to perform its welding function
Solution Approach 2:
The exterior cover is installed beforehand into the winding center hole to provide protective cushioning. This pre-installation creates a protective layer that cushions against the harmful effects of friction and high temperature before the welding rod is inserted, preventing damage to the electrode assembly and separator during the subsequent welding operation
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
Prevents damage to the electrode assembly and separator by reducing friction and heat transfer, thereby minimizing defects during the welding process.
Implementation Method 1
using a lower thermal conductivity exterior cover to shield the electrode assembly from high-temperature welding rods
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A welding device according to an embodiment of the present disclosure includes a welding rod configured to be inserted into a winding center hole provided at a winding center of an electrode assembly inserted into a battery can to weld an electrode tab of the electrode assembly or an electric connection component coupled with the electrode tab to a bottom surface of the battery can, and the welding rod includes: a center rod located at a center of the welding rod in a diameter direction; and an exterior cover configured to cover an outer circumference of the center rod and installed to be movable in a first direction away from the center rod and in a second direction closer to the center rod.