Lithium-Ion Accumulator Direct Welded Electrode Edges
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Solution Overview
Problem
Lithium-ion accumulators face issues with high contact resistance and complex, costly assembly methods, leading to suboptimal heat dissipation and energy density due to the use of connection parts between the cover and the electrode bundle.
Innovation Solution
An accumulator design featuring a container with a hollow tube around which the electrochemical bundle is wound, with direct welding of electrode edges to the container ends, minimizing mechanical parts and reducing contact resistance, and using an electrically insulating material for the container to enhance heat dissipation and energy performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intermediate connecting pieces are used between the cover and electrode array, then electrical connection is established, but contact resistance increases and heat dissipation deteriorates
Solution Approach 1:
The patent removes the intermediate connecting pieces from the battery structure, establishing direct welding between the electrode array and cover. This extraction of unnecessary components eliminates the contact resistance interface, resolving the contradiction between maintaining electrical connection and reducing energy loss.
Solution Approach 2:
The patent merges the functions of the connecting piece and the cover by making the cover itself the current collection element. The cover is directly welded to the electrode array, combining the structural covering function and the electrical current collection function into a single integrated component, thereby eliminating intermediate connection interfaces.
2Reliability
If intermediate connecting pieces are used, then electrical connection is provided, but assembly process becomes complicated and expensive
Solution Approach 1:
The patent extracts and eliminates the intermediate connecting pieces from the assembly, reducing the number of components and assembly steps. This simplification directly addresses the contradiction by removing the source of complexity while maintaining the essential electrical connection function through direct welding.
Solution Approach 2:
The patent combines multiple functions into the cover component itself - it serves as both the structural closure and the current collection terminal. This functional integration eliminates the need for separate connecting pieces, thereby simplifying the assembly process while ensuring reliable electrical connection.
3Power
If small cross-sectional area connecting pieces are used, then current collection is achieved, but heat dissipation becomes insufficient
Solution Approach 1:
The patent merges the current collection function with the cover structure, which has a significantly larger cross-sectional area than traditional connecting pieces. The cover acts as both the current collector and the heat dissipation pathway, simultaneously improving current collection capability and thermal management.
Solution Approach 2:
The patent changes the cross-sectional area parameter of the current collection path by using the cover itself rather than a thin connecting piece. This parameter change increases the heat dissipation capacity while maintaining effective current collection, resolving the contradiction between power transmission and thermal management.
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
The design achieves improved energy and power density with enhanced heat dissipation and reduced manufacturing costs by eliminating intermediate connection parts and simplifying the assembly process.
Implementation Method 1
the edges of the electrodes of one polarity being directly connected to this first cover by welding. The second current output terminal forms a second closing cover for the second end of the container, the edges of the electrodes of the other polarity being directly connected to this second cover as well by welding.
Implementation Method 2
an electrochemical bundle formed by winding alternating positive and negative electrodes separated by a separator. The container holds an electrochemical bundle formed by winding alternating positive and negative electrodes separated by a separator impregnated with electrolyte.
Data Source
Figure 1~5
AI summary
The invention relates to a battery, in particular a lithium-ion type battery. The battery comprises a container (1) containing an electrochemical bundle with alternating positive and negative electrodes (2) framing electrolyte-impregnated separators, and at least one current output terminal (3, 4) forming a cover (3, 4) for closing the container (1). The edges (5, 6) of the electrodes (2) having one of the polarities are directly connected to the cover (3, 4) by welding.