Lithium Battery Electrochemical Bundle Radial Folding and Axial Compacting
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Solution Overview
Problem
Current lithium-ion battery designs face challenges in optimizing the mass and volume of electrochemical bundles for electrical connections, leading to reduced specific capacitance and complex electrolyte filling processes due to obstacles from current collectors.
Innovation Solution
A method involving radial folding and axial packing of electrochemical bundle strips to create a planar surface for welding, reducing the mass and volume of uncoated strips, and facilitating electrolyte passage by creating a raised base for electrolyte injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional current collectors are used to make electrical connections in lithium-ion batteries, then electrical connection is achieved, but the mass and volume of the electrochemical bundle increase, reducing specific capacitance
Solution Approach 1:
The invention extracts and eliminates the separate current collector component by directly using the uncoated strips from the electrochemical cell itself as the electrical connection element. This removes the additional mass and volume that would otherwise be required for separate current collectors, thereby improving specific capacitance.
Solution Approach 2:
The uncoated strips serve multiple functions: they provide both the electrical connection and act as the current collector. By making the uncoated strips multi-functional, the invention eliminates the need for separate current collector components, reducing overall mass and volume while maintaining electrical connectivity.
2Quantity of substance
If conventional current collectors are used for electrical connections, then electrical connectivity is established, but the volume occupied by uncoated strips increases
Solution Approach 1:
The invention extracts and eliminates the separate current collector component by directly using the uncoated strips from the electrochemical cell itself as the electrical connection element. This removes the additional volume that would otherwise be required for separate current collectors, thereby improving specific capacitance.
Solution Approach 2:
The uncoated strips serve multiple functions: they provide both the electrical connection and act as the current collector. By making the uncoated strips multi-functional, the invention eliminates the need for separate current collector components, reducing overall volume while maintaining electrical connectivity.
3Reliability
If traditional welding methods are used to connect current collectors to electrochemical bundles, then electrical connection is achieved, but the electrolyte filling process becomes complex due to obstacles from current collectors
Solution Approach 1:
By removing the separate current collector component and using the uncoated strips directly, the invention eliminates the physical obstacles that complicate the electrolyte filling process. The simplified structure allows for easier and more direct electrolyte injection while maintaining reliable electrical connections through the uncoated strips.
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 approach enhances the specific capacitance of lithium-ion batteries by 10% and simplifies the electrolyte filling process by minimizing material volume and optimizing electrical connections.
Implementation Method 1
folding down with plastic deformation, in at least one direction radial to the axis X1, of a part of the strips from the outside towards the inside of the electrochemical bundle
Implementation Method 2
at least two consecutive strips overlap in their folded-over part and the overlapping folded-over parts form a substantially planar surface
Data Source
Figure 1~3
Figure 4~5
Figure 6~6A1
AI summary
The invention concerns a method for producing an electrochemical bundle (F) of a lithium battery (A), such as an Li-ion battery, with a view to electrically connecting same to the output terminals of the battery, characterised in that it comprises the combination of two steps of folding an electrochemical bundle of a lithium battery which are carried out separately, i.e. a radial folding with plastic deformation and an axial compacting, which make it possible to obtain two separate areas on at least one, and preferably both, of the lateral ends of the bundle. The invention also concerns a method for producing an electrical connection part between the electrochemical bundle and one of the output terminals of the battery, and an associated current collector.