Secondary Battery Collector Plate Crest Welding
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Solution Overview
Problem
Existing secondary batteries face challenges in achieving efficient and reliable welding of non-coating portions of electrode assemblies with collector plates, which affects the battery's capacity and weld quality detection.
Innovation Solution
The design includes a collector plate with alternately arranged crests and troughs, where the non-coating portion is welded to the crests or troughs, allowing for butt welding and exposure through a through-hole for improved visibility and efficiency, reducing the non-coating portion's size to enhance capacity and facilitate easy detection of weld quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the non-coating portion is welded to the collector plate using conventional methods, then welding is achieved, but welding efficiency is low and weld quality detection is difficult
Solution Approach 1:
The collector plate is segmented into crests and troughs, with the non-coating portion specifically positioned on the crests. This segmentation allows the welding area to be separated and highlighted, making weld quality detection easier while improving welding efficiency through the structured design.
Solution Approach 2:
The crest structure acts as an intermediary element between the non-coating portion and the collector plate body. By concentrating the non-coating portion on the crests, the design creates a dedicated welding interface that improves both welding efficiency and detectability of weld quality.
2Quantity of substance
If the non-coating portion size is reduced to enhance capacity, then battery capacity increases, but welding reliability may be compromised
Solution Approach 1:
The design applies local quality by concentrating the non-coating portion specifically on the crests of the collector plate. This localized approach allows the non-coating portion to be minimized for capacity improvement while maintaining adequate welding area on the crests to ensure welding reliability.
Solution Approach 2:
The crest structure adds a dimensional aspect to the collector plate design, creating raised areas where the non-coating portion can be concentrated. This dimensional change allows for reduced non-coating portion size overall while maintaining sufficient welding surface area on the crests for reliable welding.
3Productivity
If the non-coating portion is concentrated adjacent to the lower portion of the crests, then welding efficiency is improved, but the structure becomes more complex
Solution Approach 1:
The collector plate features a sinusoidal wave pattern with crests and troughs, introducing a curved, periodic structure. This curvature design concentrates the non-coating portion on the crests, improving welding efficiency while the regular periodic pattern keeps the structural complexity manageable through repetition.
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 enhances welding efficiency, improves weld quality detection, and increases the battery's capacity by allowing for a more compact non-coating portion and reduced risk of damage to the electrode assembly during welding.
Implementation Method 1
The collector plate may be compressed in a width direction of the non-coating portion and welded to the non-coating portion
Implementation Method 2
The collector plate may be coupled to the non-coating portion by a butt welding process
Data Source
AI summary
A secondary battery including a case providing an inner space; at least one electrode assembly, the at least one electrode assembly including a stacked and wound positive electrode plate, negative electrode plate, and separator between the positive electrode plate and the negative electrode plate, and being disposed within the case and including a non-coating portion on an end thereof; a collector plate including alternately arranged crests and troughs, the non-coating portion of the electrode assembly being disposed on the crests and the crests being welded to the non-coating portion; a collector terminal coupled to one end of the collector plate, the collector terminal protruding upwardly from the case; and a cap plate on an upper portion of the case, the cap plate sealing the case.