Cylindrical Battery Terminal Structure for Jelly-Roll Stability
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Solution Overview
Problem
The existing cylindrical battery designs face issues such as damage to electrical coupling portions due to jelly-roll movement, increased manufacturing complexity and cost, poor current collection efficiency leading to heat generation and resistance issues, and limited space efficiency which affects energy density.
Innovation Solution
The cylindrical battery design incorporates an electrode assembly with uncoated portions positioned at the top and bottom, coupled with current collecting plates, and features a sealing spacer to prevent jelly-roll movement. The electrode terminal structure is improved to increase space efficiency, reduce internal resistance, and enhance thermal stability by using single particle or pseudo-single particle positive electrode active materials and silicon-based negative electrode active materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional components are applied to reduce the space in which the jelly-roll moves, then the jelly-roll movement is restricted, but the manufacturing complexity and cost increase
Solution Approach 1:
The cap plate is designed to serve multiple functions: it seals the battery housing, provides structural support, and acts as a restraint mechanism for the jelly-roll through its positioning relative to the electrode assembly. This multi-functionality eliminates the need for separate restraint components, reducing manufacturing complexity while maintaining jelly-roll stability.
2Reliability
If the space between the current collecting plate and cap plate/battery housing is reduced, then the jelly-roll movement is prevented, but the manufacturing precision requirements increase
Solution Approach 1:
The electrode assembly is designed with specific local characteristics at the ends where the electrode tabs extend. The current collecting plates are positioned to cover these specific regions, creating localized stability zones that prevent jelly-roll movement without requiring precise control of the entire assembly spacing. This localized approach reduces overall manufacturing precision requirements.
3Quantity of substance
If the electrode terminal structure is improved to increase space efficiency, then the energy density increases, but the manufacturing complexity increases
Solution Approach 1:
The electrode terminal structure integrates the current collecting plates and terminal connections into a unified design. The first current collecting plate connects to the first electrode tab, and the second current collecting plate connects to the second electrode tab, with both plates positioned within the battery housing to utilize available space efficiently. This merged structure achieves high energy density without requiring separate complex terminal components.
Data Source
AI summary
Disclosed is a cylindrical battery, which includes an electrode assembly; a battery housing accommodating the electrode assembly; a first current collecting plate coupled to the first uncoated portion and located within the battery housing; a cap plate covering the open portion; a sealing spacer configured to prevent the electrode assembly from moving and to enhance the sealing force of the battery housing; an electrode terminal electrically connected to the second uncoated portion; and an insulating gasket interposed between the electrode terminal and the perforated hole, and the electrode terminal includes a body portion; an outer flange portion extending along an outer surface of the closed portion from a circumference of one side of the body portion; an inner flange portion configured to extend from a circumference of the other side of the body portion; and a flat portion provided on an inner side of the inner flange portion.