Cylindrical Battery Current Collector Structure for External Welding
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Solution Overview
Problem
The welding of negative electrode current collecting plates inside cylinder type rechargeable batteries can generate foreign substances within the case, increasing resistance and manufacturing defects.
Innovation Solution
A cylinder type rechargeable battery design featuring a negative electrode current collecting plate with elastic portions and through holes, allowing external welding to prevent foreign substance generation and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is performed inside the case, then electrical connection is achieved, but foreign substances are generated inside the case increasing resistance
Solution Approach 1:
The welding operation is extracted from the internal case environment and relocated to the external environment. The current collecting plate extends outward to allow welding to be performed outside the case, thereby eliminating foreign substance generation inside the case while maintaining electrical connection reliability.
Solution Approach 2:
The current collecting plate serves as an intermediary element that bridges the internal electrode assembly and the external welding environment. By extending the current collecting plate outward, the welding interface is positioned outside the case while still achieving the required electrical connection function.
2Ease of manufacture
If welding is performed inside the case, then current collection is achieved, but manufacturing defects increase due to foreign substances
Solution Approach 1:
The welding process is extracted from the confined internal space and performed in the external environment. This eliminates contamination risks during manufacturing while preserving the current collection function through the extended current collecting plate structure.
3Object-generated harmful factors
If welding is performed from outside, then foreign substance generation is prevented, but current collecting plate structure becomes more complex
Solution Approach 1:
The current collecting plate is segmented into distinct functional portions: a base portion for internal connection and an extended portion for external welding. This segmentation allows the structure to achieve external welding capability while maintaining clear functional separation and reducing overall complexity.
Solution Approach 2:
Instead of bringing the welding interface inward to the case interior, the structure is inverted by extending the current collecting plate outward. This inversion positions the welding interface externally, preventing foreign substance generation while using a relatively simple extended plate structure rather than a complex internal mechanism.
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 foreign substances from entering the case, reducing resistance and manufacturing defects, thereby improving productivity and lowering costs.
Implementation Method 1
Each of the first elastic portion and the second elastic portion may include or be formed of an elastically deformable material.
Data Source
AI summary
A cylinder type rechargeable battery of the present disclosure includes: an electrode assembly; a case comprising a body portion and an inlet portion extending into the body portion and having a portion shaped as a plane, the case accommodating the electrode assembly; and a negative electrode current collecting plate comprising a base portion comprising a portion connected to the electrode assembly and a contact portion extending from an edge of the base portion toward the inlet portion and contacting the portion shaped as the plane of an inner surface of the case, the negative electrode current collecting plate being electrically connected to the electrode assembly.