High-Power Lithium Battery Non-Coating Tab Design
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Solution Overview
Problem
Current lithium secondary batteries face challenges in reducing resistance and increasing output, particularly in high-power applications, due to the configuration of electrode tabs and the lack of integration in electrode assemblies, which can lead to safety issues and inefficiencies in energy storage.
Innovation Solution
The introduction of non-coating portions in the upper and lower portions of the electrodes, connected to electrode tabs, and the use of a complex porous separator coated with a binder polymer or inorganic particles, forming an integral laminated structure to reduce resistance and enhance safety and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-coating portions are disposed at the end portions of electrodes, then electrode tabs can be connected, but the distance over which electric current flows increases, resulting in higher resistance
Solution Approach 1:
The patent applies dimensional change by moving the non-coating portions from the lateral end portions of the electrodes to the upper and lower portions in the longitudinal direction. This spatial reconfiguration allows electrode tabs to be connected at the ends while keeping the current flow path short, as the non-coating portions are now positioned at the upper and lower surfaces rather than at the lateral ends where current would have to travel along the electrode length.
2Ease of manufacture
If electrode assemblies are not integrated, then fabrication is simpler, but the structure lacks stability and safety under external shock
Solution Approach 1:
The patent applies merging by integrating the positive electrode, negative electrode, and separator into a single unified structure through a press process. This integration creates a stable, shock-resistant assembly where the components are mechanically bonded together, preventing relative movement and maintaining structural integrity under external forces while still allowing for straightforward fabrication through the pressing operation.
3Ease of manufacture
If a standard porous separator is used, then fabrication is easier, but the electrodes are not integrally formed, increasing resistance and reducing output
Solution Approach 1:
The patent applies composite materials by using a press process that bonds the positive electrode, negative electrode, and separator together into an integrated structure. This creates a composite assembly where the components are mechanically and electrically connected, reducing contact resistance and improving current flow efficiency, thereby increasing power output while maintaining ease of fabrication through the pressing operation.
Data Source
AI summary
Provided is a secondary battery including an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The positive electrode includes a positive electrode non-coating portion that is not coated with an active material in a portion of a positive electrode collector. The negative electrode includes a negative electrode non-coating portion that is not coated with an active material in a portion of a negative electrode collector. The non-coating portions are disposed in at least one of upper and lower portions of the electrode assembly in a longitudinal direction of the electrodes. A positive electrode tab and a negative electrode tab are connected to the non-coating portions. The separator is a complex porous separator including a substrate coated with a binder polymer or an organic/inorganic mixture formed of a binder polymer and inorganic particles.