Secondary Battery Sealing Weld Path for Electrolyte Evaporation
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Solution Overview
Problem
The existing methods for manufacturing secondary batteries face challenges in effectively removing residual electrolyte solutions during the sealing process, leading to welding defects due to delayed evaporation and subsequent flow of electrolyte solutions, which can cause explosions and other issues.
Innovation Solution
A method involving the formation of a spot-shaped or tail-shaped welding trajectory beginning portion on the battery exterior cap, allowing for simultaneous evaporation and removal of electrolyte solutions during the sealing process along a circular trajectory, thereby minimizing the effect of residual electrolyte solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If low-output laser is used to evaporate and remove residual electrolyte solution before sealing welding, then the electrolyte solution can be removed, but the electrolyte solution may flow out during the delay time between evaporation and welding, causing welding defects
Solution Approach 1:
The patent applies preliminary action by forming a welding trajectory beginning portion (spot-shaped or tail-shaped) before the main sealing welding process. This beginning portion is created in advance to serve as a starting point for the welding trajectory, allowing the welding to commence immediately without delay time. The preliminary formation of this beginning portion ensures that electrolyte solution is evaporated and removed right at the start of welding, preventing any flow-out during a non-existent delay period.
Solution Approach 2:
The patent implements the skipping principle by eliminating the delay time between electrolyte solution removal and sealing welding. Instead of separating these operations with a time gap, the welding trajectory beginning portion is formed such that welding starts immediately at the beginning portion, rushing through the potential harmful delay period. This ensures the electrolyte solution is dealt with and welding commences in continuous operation without interruption or time for solution flow-out.
2Productivity
If sealing welding is performed immediately after assembly without electrolyte solution removal, then productivity is improved, but welding defects occur due to residual electrolyte solution
Solution Approach 1:
The patent merges the electrolyte solution removal function with the sealing welding process by incorporating the welding trajectory beginning portion formation into the welding operation itself. Rather than performing separate removal and welding steps, the beginning portion serves dual purposes: it removes electrolyte solution through localized heating while simultaneously initiating the sealing welding. This merging eliminates delay time and ensures both productivity and welding quality.
Solution Approach 2:
The welding trajectory beginning portion acts as an intermediary element that mediates between the conflicting requirements of immediate welding and electrolyte solution removal. This beginning portion, formed as part of the welding trajectory, serves as an intermediate step that handles the electrolyte solution issue right at the start of welding, allowing the main sealing welding to proceed immediately without compromising either productivity or reliability.
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
This approach enables efficient sealing without delay, effectively minimizing the impact of residual electrolyte solutions and preventing welding defects, thus enhancing the safety and reliability of secondary batteries.
Implementation Method 1
irradiating low-output laser to evaporate and remove the residual electrolyte solution
Implementation Method 2
irradiating low-output laser to evaporate and remove the residual electrolyte solution
Data Source
AI summary
The present application relates to a method of manufacturing a secondary battery and a secondary battery capable of minimizing an effect of an electrolyte solution.