Button Cell Collector Welding for Low-Resistance Heat Dissipation
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Solution Overview
Problem
Existing button cells face challenges in achieving optimal electrical connection and heat dissipation due to internal resistance, which limits their ability to handle large currents and efficiently manage heat within the cell.
Innovation Solution
The electrochemical energy storage cell design features a direct electrical connection of the longitudinal edges of the current collectors to the housing cup base and lid, utilizing deformation regions for improved contact and welding, reducing internal resistance and enhancing heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current collectors are directly connected to the housing cup base and lid through deformation regions, then the electrical connection is improved and internal resistance is reduced, but the manufacturing complexity increases due to additional welding steps
Solution Approach 1:
The patent combines the electrical connection function with the housing structure by integrating the current collectors directly into the housing cup base and lid through deformation regions. This merging eliminates the need for separate connection components and reduces internal resistance while maintaining manufacturing feasibility through standardized welding processes.
Solution Approach 2:
The deformation regions are pre-formed in the housing cup base and lid during manufacturing, creating ready-to-weld surfaces before the electrode assembly is inserted. This preliminary preparation of connection surfaces simplifies the overall manufacturing process by separating the connection preparation from the assembly process.
2Temperature
If the current collectors are directly connected to the housing, then heat dissipation is improved, but the manufacturing precision requirements increase for achieving stable contact
Solution Approach 1:
The patent applies local quality by creating deformation regions with specific geometric properties at the connection points of the housing cup base and lid. These localized deformations provide enhanced contact surfaces with controlled mechanical properties, ensuring stable electrical and thermal connections without requiring high precision throughout the entire housing structure.
Solution Approach 2:
The deformation regions modify the physical parameters of the housing material at connection points, creating localized areas with increased surface area and improved mechanical interlocking. This parameter change in the housing structure enables reliable contact while maintaining overall manufacturing feasibility.
3Reliability
If deformation regions are used for connection, then the electrical contact is enhanced, but the manufacturing time increases due to additional processing steps
Solution Approach 1:
The deformation regions are created as pre-formed features in the housing manufacturing process, before electrode assembly is inserted. This preliminary creation of connection surfaces allows the deformation and welding steps to be performed independently and efficiently, rather than requiring complex coordinated operations during final assembly.
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 facilitates better absorption of large currents and improved heat dissipation, while also simplifying the manufacturing process, particularly for mass production, by ensuring a stable and reliable electrical connection.
Implementation Method 1
the first longitudinal edge of the anode current collector or the first longitudinal edge of the cathode current collector abuts directly against a respective inner side, the respective inner side including a region having a projection directed into the interior space, wherein the first longitudinal edge of the anode current collector or the first longitudinal edge of the cathode current collector that abuts directly on the respective inner side is welded to the projection
Data Source
AI summary
An electrochemical energy storage cell in the form of a button cell includes a housing enclosing an interior space in an airtight and liquid-tight manner. The housing includes a metallic, cup-shaped housing part that comprises a housing cup base, a circumferential side wall, and a terminal opening. The housing further includes a lid that closes the terminal opening of the cup-shaped housing part. The electrochemical energy storage cell additionally includes an electrode-separator assembly in the form of a cylindrical winding. The electrode-separator assembly includes a ribbon-shaped anode comprising an anode current collector and a ribbon-shaped cathode comprising a cathode current collector. An inner side of the housing includes a region having a projection directed into the interior space. A first longitudinal edge of the anode current collector or of the cathode current collector is welded to the projection.