Secondary Battery Tab-Subplate Welding for Stable Current Collection
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Solution Overview
Problem
Existing lithium secondary batteries face challenges in achieving high energy density and capacity, with inefficiencies in the electrical connections within the battery structure affecting performance.
Innovation Solution
The secondary battery design includes specific configurations such as tab members, sub-plates, and current collectors with multiple welding lines and reinforcing welding lines to enhance electrical connectivity and stability, along with a manufacturing method that forms these components to optimize power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple welding lines and reinforcing welding lines are added to enhance electrical connections, then power efficiency and stability are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The welding connection is divided into multiple segments: first welding lines connecting tab members to sub-plates, second welding lines connecting sub-plates to current collectors, and reinforcing welding lines providing additional bonding. This segmentation distributes the electrical connection function across multiple specialized joints, improving overall reliability while organizing complexity into manageable functional units.
Solution Approach 2:
Sub-plates are pre-positioned and welded to tab members before final assembly with current collectors. The first welding lines are formed in advance during tab member attachment, preparing the electrical connection pathway before the main current collector integration. This preliminary action ensures proper alignment and reduces assembly complexity.
2Reliability
If sub-plates are used to connect tab members to current collectors, then electrical connectivity is improved, but manufacturing steps and time increase
Solution Approach 1:
The sub-plate integrates multiple functions into a single component: it serves as a mechanical support structure, an electrical conductor, and a bonding interface between tab members and current collectors. By merging these functions, the design eliminates the need for separate support structures and wiring, actually reducing the number of discrete parts and assembly steps despite adding a intermediate component.
Solution Approach 2:
The sub-plate performs multiple roles simultaneously: providing structural support for tab members, establishing electrical pathways, and serving as a welding substrate for current collector attachment. This multi-functionality consolidates what would otherwise require multiple specialized components, improving manufacturing efficiency while ensuring reliable electrical connectivity.
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 enhanced electrical connections improve power efficiency and stability, leading to increased energy density and capacity in lithium secondary batteries.
Implementation Method 1
a first sub-welding line on the first sub-plate and the first tab member connecting the first sub-plate to the first tab member... a first welding line on the first current collecting plate and the first sub-plate connecting the first current collecting plate to the first sub-plate
Data Source
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AI summary
A secondary battery includes: a case; an electrode assembly inside the case; a cap assembly sealing the case and including a first terminal and a second terminal; a first tab member extending from the electrode assembly in a first direction; a first sub-plate between the electrode assembly and the case and connected to the first tab member; and a first current collector connected to the first terminal and the first sub-plate.