Battery Tab Double-Solder Structure for Reliable Cover Plate Welding
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Solution Overview
Problem
The existing methods for connecting a tab to a cover plate assembly in batteries often result in damaged tabs or poor welding quality due to structural limitations and uneven heat distribution during the welding process.
Innovation Solution
A battery design featuring a tab with a first solder mark and a second solder mark, where the second solder mark covers the first solder mark and is formed with a circumferentially closed space to expose it, allowing for better heat dissipation and uniform heat distribution during welding, thereby improving the connection reliability and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct welding is used to connect the tab to the cover plate assembly, then the connection is simple and fast, but the tab may be damaged or welding quality may be poor due to uneven heat distribution
Solution Approach 1:
The welding process is segmented into two distinct stages: first welding the tab to the cell body, then welding the cover plate assembly to the tab. This segmentation allows each welding operation to be optimized independently, preventing tab damage while ensuring reliable connections at both interfaces.
Solution Approach 2:
The tab is pre-welded to the cell body before the cover plate assembly is attached. This preliminary action stabilizes the tab and distributes the welding heat more effectively, preventing tab damage during the subsequent welding of the cover plate assembly.
2Strength
If welding energy is concentrated to ensure strong bonding, then connection strength is improved, but the tab structure may be damaged due to excessive heat
Solution Approach 1:
The concentrated welding energy is divided into two separate welding operations. The first welding concentrates energy at the tab-cell body interface, while the second welding concentrates energy at the cover plate-tab interface. This segmentation ensures strong bonding at each interface without subjecting the tab to excessive cumulative heat that would cause damage.
Solution Approach 2:
Each welding operation applies concentrated energy locally at its specific interface rather than distributing it uniformly across the entire tab structure. The first welding creates strong bonding at the cell body-tab interface, while the second welding creates strong bonding at the cover plate-tab interface, with each localized energy application optimized for its specific connection point.
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 design enhances the welding quality by controlling energy distribution, reducing the risk of tab damage and ensuring a stable connection between the tab and the cover plate assembly, leading to improved battery performance.
Implementation Method 1
the second solder mark is formed with a circumferentially closed space to expose the first solder mark... allowing for better heat dissipation and uniform heat distribution during welding
Data Source
AI summary
The disclosure relates to the technical field of batteries, and provides a battery and a battery manufacturing method. The battery includes a cell, and the cell includes a cell body and a tab. The tab extends from the cell body, and the tab includes a first solder mark and a second solder mark. The second solder mark covers the first solder mark, and the second solder mark is formed with a circumferentially closed space to expose the first solder mark. That is, when welding the tab and the cover plate assembly, the tab is welded twice, and a hollow second solder mark is formed.