Cylindrical Battery Terminal Structure for Same-Side Current Collection
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Solution Overview
Problem
Conventional cylindrical batteries face challenges with complex electrical connection structures due to opposite orientations of positive and negative electrode terminals, leading to increased resistance, heat generation, and reduced energy density, especially during rapid charging, and require improved terminal structures for efficient electrical wiring and thermal stability.
Innovation Solution
A cylindrical battery design with electrode terminals aligned in the same direction, featuring a wound electrode assembly with uncoated portions bent towards the core for improved current collection and a silicon-based negative electrode active material, along with a positive electrode active material comprising single or pseudo-single particles, to enhance thermal stability and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If positive and negative electrode terminals are located on opposite sides of the cylindrical battery, then electrical connection between multiple batteries can be established, but the electrical connection structure becomes complicated and requires more insulation and sealing parts
Solution Approach 1:
The patent merges the positive and negative electrode terminals to the same side of the cylindrical battery, allowing both terminals to be positioned adjacently on the upper side. This consolidation eliminates the need for separate insulation and sealing structures at both upper and lower portions, simplifying the overall electrical connection structure while maintaining reliability.
2Device complexity
If multiple cylindrical batteries are electrically connected using conventional opposite-side terminals, then electrical connection is achieved, but the number of parts increases and structure becomes complicated
Solution Approach 1:
By positioning both positive and negative electrode terminals on the same side, the patent reduces the number of separate connection points from four (two at upper portion, two at lower portion) to two (both at upper side). This merger significantly reduces the number of insulation and sealing parts required, simplifying both the structure and manufacturing process.
3Reliability
If electrode terminals are positioned on opposite sides, then conventional battery structure is maintained, but current collection efficiency is reduced due to large resistance and heat generation
Solution Approach 1:
The patent introduces asymmetry by positioning both positive and negative electrode terminals on the same side of the cylindrical battery, breaking the conventional symmetric opposite-side arrangement. This asymmetric configuration shortens the current path length within the battery, reducing internal resistance and heat generation while improving current collection efficiency.
4Quantity of substance
If conventional terminal structure is used, then manufacturing is simplified, but energy density is reduced due to inefficient electrical connection
Solution Approach 1:
The patent transitions from the conventional three-dimensional opposite-side terminal arrangement to a two-dimensional adjacent terminal configuration on the same side. This dimensional reconfiguration optimizes the electrical connection efficiency and current collection path, increasing energy density while maintaining manufacturing simplicity through the adjacent terminal structure.
Data Source
AI summary
A cylindrical battery includes an electrode assembly having a first uncoated portion and a second uncoated defined as an electrode tab; a battery housing accommodating the electrode assembly through an opening and electrically connected to the second uncoated portion; an electrode terminal riveted through a perforated hole formed in a closed portion of the battery housing and electrically connected to the first uncoated portion; an insulating gasket interposed between the electrode terminal and the perforated hole; and a cap plate configured to cover the opening of the battery housing. The electrode terminal includes a body portion; an outer flange portion extending along an outer surface of the closed portion exposed through the outer surface of the closed portion; an inner flange portion extending toward an inner surface of the closed portion exposed through the inner surface; and a flat portion provided on an inner side of the inner flange portion.