Battery Can Bottom Welding Steps for Direct Current Collection
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Solution Overview
Problem
Conventional rechargeable batteries have a complex internal configuration and manufacturing process due to the inclusion of a current collecting plate, which occupies space and limits the battery capacity.
Innovation Solution
The rechargeable battery design omits the current collecting plate by using a can bottom portion with welding stepped parts to directly affix the electrode assembly, allowing the can to act as a current collector, thereby simplifying the internal configuration and increasing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current collecting plate is used to connect the electrode assembly, then the battery structure is stable and current collection is reliable, but the number of parts increases and the battery capacity is reduced
Solution Approach 1:
The patent merges the current collecting plate function with the can bottom portion by providing welding stepped parts directly on the can bottom. The can bottom portion now serves dual purposes: containing the electrode assembly and collecting current, thereby eliminating the separate current collecting plate and reducing part count while maintaining reliable current collection.
Solution Approach 2:
The can bottom portion is designed with welding stepped parts that enable it to perform multiple functions: structural containment of the electrode assembly and electrical current collection. This multi-functional design replaces the traditional separate current collecting plate, simplifying the overall battery structure.
2Reliability
If a current collecting plate is used to connect the electrode assembly, then current collection is reliable, but the manufacturing process becomes more complex
Solution Approach 1:
The patent combines the current collection function into the can bottom portion through integrated welding stepped parts. This eliminates the need for separate current collecting plate assembly steps, simplifying the manufacturing process while ensuring reliable current collection through direct welding to the electrode assembly.
3Quantity of substance
If the can bottom portion thickness is reduced to save material, then manufacturing cost decreases, but mechanical strength and welding quality may be compromised
Solution Approach 1:
The can bottom portion features localized thickening at the welding stepped parts where current collection and welding occur. This local quality enhancement ensures sufficient mechanical strength and welding quality at critical areas while maintaining thinner walls in non-critical areas, optimizing material usage without compromising overall performance.
4Device complexity
If welding stepped parts are added to the can bottom portion, then current collection is improved and part count is reduced, but the manufacturing complexity of the can increases
Solution Approach 1:
The welding stepped parts are integrated into the can bottom portion manufacturing process, combining the can formation and current collection structure creation into a single manufacturing step. This eliminates the need for separate current collecting plate assembly operations, reducing overall manufacturing complexity despite the enhanced can bottom design.
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 reduces the number of parts, simplifies the manufacturing process, and enhances battery capacity by utilizing the can bottom portion as a current collector, maintaining mechanical strength and ensuring uniform welding quality.
Implementation Method 1
a plurality of welding stepped parts protruding from the base part toward the uncoated region and welded to the uncoated region
Data Source
AI summary
A rechargeable battery includes: an electrode assembly having an uncoated region; a can having a bottom portion facing the uncoated region and a side portion connected to an edge of the bottom portion, the can accommodating the electrode assembly in an inner space thereof, the bottom portion of the can having a base part connected to the side portion and a plurality of welding stepped parts protruding from the base part toward the uncoated region and welded to the uncoated region; and a cap plate coupled to an open end of the side portion to seal the can.