Reinforced Lithium Electrode Plate for Tab Weldability and Strength
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Solution Overview
Problem
Lithium metal-based negative electrodes in secondary batteries face issues with low mechanical strength, deformation during manufacturing, and poor weldability between the electrode tab and lead tab, leading to inefficiencies and safety risks.
Innovation Solution
A manufacturing method involving a reinforcing member with a mesh structure is integrated into the lithium-based electrode plate, enhancing mechanical strength and weldability by filling pore parts with the metal material, and forming an electrode tab through pressing and tab forming processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal is used as the negative electrode material, then the energy density and battery performance are improved, but the mechanical strength decreases making the electrode easy to deform or break
Solution Approach 1:
The patent applies composite materials by combining lithium metal with a porous reinforcing member (mesh structure made of metal or ceramic). This composite structure maintains the high energy density of lithium metal while the porous reinforcement provides mechanical strength, preventing deformation and breakage during manufacturing and battery operation.
Solution Approach 2:
The patent applies local quality by strategically placing the porous reinforcing member only in specific regions where mechanical support is needed, such as the electrode tab area and regions prone to deformation. This localized reinforcement maintains overall battery performance while providing targeted mechanical support.
2Reliability
If lithium metal electrode tab is used, then the electrical conductivity is improved, but the weldability with lead tab deteriorates causing pressing and spreading during welding process
Solution Approach 1:
The patent applies composite materials in the electrode tab by combining lithium metal with the porous reinforcing member. This composite tab structure maintains the excellent electrical conductivity of lithium metal while the reinforcement provides mechanical support during welding, preventing pressing and spreading issues.
Solution Approach 2:
The porous reinforcing member acts as an intermediary that provides mechanical support during the welding process. It serves as a structural mediator between the soft lithium metal tab and the welding tool, enabling reliable welding without deforming the lithium tab.
3Strength
If the reinforcing member with mesh structure is added, then the mechanical strength is improved, but the device complexity increases
Solution Approach 1:
The patent applies porous materials by using a mesh structure with controlled porosity. The porous reinforcing member provides mechanical strength while maintaining flexibility and allowing electrolyte penetration. The porous structure is simpler than solid rigid reinforcements and can be integrated into the existing electrode manufacturing process.
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 method results in a lithium metal electrode plate with improved mechanical strength, increased manufacturing efficiency, and enhanced weldability, reducing deformation and adhesion issues during the manufacturing process.
Implementation Method 1
pressing the first base material and the second base material with a pressing member, wherein the second base material is pressed into the first base material
Data Source
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AI summary
An electrode plate for a secondary battery includes an electrode plate body which is made of a metal material and has at least one electrode tab disposed at the edge of one side; and a reinforcing member which is inserted into and coupled to the electrode plate body and has a plurality of voids, wherein at least some of the plurality of voids are filled with the metal material forming the electrode plate body.