Cathode Separator Pocket Sealing to Prevent Electrode Slipping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing cathode apparatuses for batteries, especially in electric vehicles, face challenges in securely holding the cathode in place to prevent slipping and potential short circuits during electrode assembly, leading to increased production costs and complexity.
Innovation Solution
A method involving cutting a cathode strip into a flat sheet and placing it between two strip-shaped separator foils, which are then cut to size and fused together using a heated rotary blade or laser, creating a secure pocket to hold the cathode in place, thereby reducing the risk of slipping and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cathode is placed between separator foils without fusion, then the production process is simpler, but the cathode can slip and cause short circuits
Solution Approach 1:
The separator foils are fused together through thermal heating, transitioning from a separate state to a bonded state. This thermal fusion creates a secure pocket structure that prevents cathode slipping while maintaining production efficiency. The heated rotary blade or laser provides localized thermal energy to achieve this phase transition and bonding.
2Manufacturing precision
If the separator foils are cut to size after placing the cathode, then positioning accuracy is improved, but production time increases
Solution Approach 1:
The separator foils are pre-cut to the required size before the cathode is placed between them. This preliminary cutting action allows for precise dimensional control of the separator foils, ensuring accurate positioning and proper fit around the cathode while maintaining efficient production throughput.
3Strength
If a heated rotary blade or laser is used to fuse separator foils, then bonding strength is improved, but energy consumption increases
Solution Approach 1:
The mechanical cutting and bonding process is replaced with thermal energy application using a heated rotary blade or laser. This substitution enables precise localized heating that creates strong bonds between separator foils through controlled thermal fusion, achieving superior bonding strength while maintaining energy efficiency through targeted energy application.
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 simplifies the production process, reduces costs, and securely holds the cathode in place, preventing slipping and potential short circuits, thus enhancing the reliability of the cathode apparatus in battery electrode assemblies.
Implementation Method 1
the two separator foil cutouts are also joined to each other... The cutting is carried out in an area of the two separator foils that protrudes beyond the cathode. During the cutting, the two separator foil cutouts are joined to each other, especially fused together.
Data Source
AI summary
The invention relates to a method for producing a cathode apparatus (16) for a battery (8), especially of a motor vehicle (2), whereby a cathode strip (20) is provided, whereby a cathode (16a) is cut out of the cathode strip (20), whereby the cathode (16a) is placed between two strip-shaped separator foils (16d), and whereby, in a joint step, the two separator foils (16d) are cut to size in an area that protrudes beyond the cathode (16a), thereby forming appropriate separator foil cutouts (16f), and these two separator foil cutouts (16f) are also joined to each other in this area, especially fused together. Furthermore, the invention relates to a method for producing a cathode apparatus (16), whereby a single strip-shaped separator foil (16d) is folded and arranged on the cathode (16a) in such a way that the folded edge of the separator foil (16d) adjoins a contact face (38) of the cathode (16a) and so that the cathode (16a) is covered on both sides by a separator foil section (16g) of the separator foil (16d). Furthermore, the invention relates to a method for producing an electrode assembly (12) having such a cathode apparatus (16), to a battery (8) having such an electrode assembly (12), as well as to a motor vehicle (2) having such a battery (8).