Cylindrical Battery Electrode Winding Contact Without End Welding
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Solution Overview
Problem
Existing accumulator manufacturing methods require more space and are costly due to the need for additional contact elements on both ends, and the welding process is difficult and prone to leaks.
Innovation Solution
A method where metal foils are wound into a cylindrical electrode coil with one edge region protruding, glued to the bottom of a cup-shaped housing part using an electrically conductive adhesive, and optionally welded to a contact element, allowing for reliable electrical connection and reduced manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If contact elements with poles are installed on both ends of the housing, then high electrical power delivery is achieved, but space requirements increase and manufacturing costs rise
Solution Approach 1:
The invention extracts the contact function from both ends of the battery to only one end. The metal foil edge region that protrudes from the electrode coil serves as the contact element, eliminating the need for separate contact elements and poles on both ends. This reduces the number of components while maintaining the electrical power delivery capability through the single contact point at one end.
2Reliability
If welding is used to connect the electrode coil to the housing base, then electrical connection is achieved, but the risk of leaks increases due to difficulty in mastering the welding process
Solution Approach 1:
The invention replaces the welding process (thermal/mechanical system) with a mechanical pressing system. The metal foil edge region is pressed against the housing base through a pressing device, creating an electrical connection without welding. This substitution eliminates the risks associated with welding (holes, leaks) while maintaining reliable electrical connection, and significantly reduces manufacturing difficulty.
3Device complexity
If the metal foil edge region is pressed against the housing base, then space requirements are reduced and manufacturing is simplified, but electrical connection reliability must be maintained
Solution Approach 1:
The invention applies preliminary action by first pressing the metal foil edge region against the housing base before final assembly steps. The pressing device applies force to ensure good contact between the metal foil and the base, creating a reliable electrical connection in advance. This preliminary pressing action ensures that when the battery is assembled and used, the electrical connection maintains high reliability without requiring complex welding or additional contact elements.
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 method reduces space requirements, lowers production costs, and ensures a reliable electrical connection without the risk of leaks, making it suitable for high-power applications like lithium-ion batteries.
Implementation Method 1
an electrically conductive adhesive is used in the process for producing the bond. Such an electrically conductive adhesive has the advantage that an electrical connection between the first metal foil or the first contact element and the floor is established via the adhesive.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to a method for manufacturing an accumulator, wherein metal foils (3, 23), which contact electrodes of the accumulator, are wound together with the electrodes of the accumulator to form an electrode winding (1) that is at least substantially cylindrical, in particular circular cylindrical, such that a first edge region of a first metal foil (23) projects from one of the two opposing end faces of the electrode winding (1) to contact a first electrode relative to the other layered components of the electrode winding (1). The electrode winding (1) is placed in a cup-shaped housing part (21) with a base (22), and to contact the first electrode of the accumulator, the first edge region of the first metal foil (23) of the first electrode and/or a first contact element electrically connected to the first edge region is bonded to the base (22) of the housing part (21).