Jelly-Roll Battery Current Collector for Low Resistance and Electrolyte Flow
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Solution Overview
Problem
The existing structure of jelly-roll type secondary battery electrode assemblies has a restricted current path due to the electrode tab configuration, leading to high resistance and inefficient electrolyte injection.
Innovation Solution
A secondary battery design featuring a current collecting plate with multiple legs extending from a central core, electrically connected to the non-coated portion of the electrode, providing a shorter and more efficient current path, and allowing for improved electrolyte injection by optimizing the contact area and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrode tabs are used to connect the jelly-roll type electrode assembly and external terminal, then the battery structure is simple and easy to manufacture, but the current path is restricted and resistance is high
Solution Approach 1:
The current collecting plate is divided into multiple legs (first leg, second leg, third leg, fourth leg) that extend in different directions from the central portion. Each leg independently contacts the electrode assembly at different positions, creating multiple parallel current paths that reduce overall resistance while maintaining manufacturing simplicity
Solution Approach 2:
The current collecting plate transitions from a traditional single-point or single-plane connection to a three-dimensional multi-leg structure that contacts the electrode assembly at multiple spatial positions. This dimensional expansion creates additional current pathways without complicating the manufacturing process
2Reliability
If the current collecting plate has a solid structure, then electrical connection is good, but electrolyte injection is restricted
Solution Approach 1:
The central portion of the current collecting plate includes a current collecting plate hole (aperture) that allows electrolyte to pass through. This creates a porous structure that maintains electrical conductivity through the metallic plate while enabling efficient electrolyte injection and distribution into the electrode assembly
Solution Approach 2:
The current collecting plate performs multiple functions simultaneously: it collects current from the electrode assembly through its legs, provides electrical connection to the external terminal, and serves as a conduit for electrolyte injection through the central hole. This multi-functionality resolves the contradiction between electrical connection and electrolyte injection
3Reliability
If the contact area between current collecting plate and electrode is increased, then resistance is reduced, but the aperture ratio decreases affecting electrolyte injection
Solution Approach 1:
The contact area is segmented into multiple discrete contact points through the legs rather than a single large contact area. This segmentation allows the total contact area to be distributed across multiple locations, reducing resistance while leaving the central aperture open for electrolyte injection
Solution Approach 2:
The contact interface transitions from a two-dimensional plane contact to a three-dimensional multi-point contact through the legs. This dimensional change allows increased total contact surface area while maintaining an open central aperture, as the legs contact the electrode at different radial positions rather than covering the entire surface
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 design reduces resistance and enhances electrolyte injection performance by creating multiple current paths and increasing the contact area between the current collecting plate and the electrode, improving the overall efficiency and energy density of the battery.
Implementation Method 1
a current collecting plate provided at one end of the electrode assembly at which the non-coated portion of the first electrode is exposed, the current collecting plate including: a central portion corresponding to a core of the electrode assembly; and two or more legs each having one end connected to the central portion, the leg extending in a direction toward an outer periphery of the electrode assembly and electrically connected to the non-coated portion of the first electrode
Data Source
AI summary
A secondary battery includes an electrode assembly in which a first electrode, a separator, and a second electrode are stacked and wound, the first electrode including a first electrode current collector having a non-coated portion, on which an electrode active material layer is not provided, is located at a long side end of the first electrode based on a direction in which the current collector is wound, and a current collecting plate located at one end of the electrode assembly at which the non-coated portion of the first electrode is exposed, the current collecting plate including: a central portion corresponding to a core of the electrode assembly, and two or more legs each having one end connected to the central portion, each leg extending in a direction toward an outer periphery of the electrode assembly, in which the central portion includes a current collecting plate hole.