Cylindrical Battery Current Collector Layout for Lower Resistance
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Solution Overview
Problem
Secondary batteries face challenges in achieving low electrical resistance and accommodating large electrode assemblies within a compact case design, while maintaining efficient terminal connections and minimizing internal pressure.
Innovation Solution
The design includes first and second tabs of the electrode assembly aligned in the same direction for electrical connection to terminals, with three-dimensionally coupled current collector plates occupying a small volume and a conductive ring plate for terminal flatness, enhancing electrical pathways and internal space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode assembly is made larger to increase battery capacity, then the battery capacity increases, but the internal resistance increases and the case volume requirement increases
Solution Approach 1:
The current collector plates transition from a traditional planar configuration to a three-dimensional structure with multiple levels and folded regions. This dimensional change allows the current collector to span larger electrode assemblies while maintaining short electrical pathways, thereby reducing internal resistance even as battery capacity increases.
Solution Approach 2:
The first and second current collector plates are coupled together in a three-dimensional arrangement, creating an integrated current collection system. This merging of current collection functions into a unified 3D structure improves electrical connectivity across the electrode assembly, reducing internal resistance while accommodating larger capacity electrodes.
2Quantity of substance
If the electrode assembly is made larger to increase battery capacity, then the battery capacity increases, but the case volume increases
Solution Approach 1:
The three-dimensional current collector plates utilize vertical and lateral spacing to create an compact arrangement that accommodates larger electrode assemblies without proportionally increasing case volume. The folded and multi-level structure optimizes space utilization within the case.
Solution Approach 2:
The current collector plates are positioned in nested or overlapping three-dimensional arrangements, with first and second current collector plates coupled together in a space-efficient configuration. This nesting approach allows larger electrode assemblies to fit within a constrained case volume.
3Ease of manufacture
If the tabs are positioned in opposite directions for traditional terminal connection, then the terminal connection is straightforward, but the current path length increases and electrical resistance increases
Solution Approach 1:
The tabs are positioned in the same direction (first direction) rather than opposite directions, and the three-dimensional current collector plates provide the necessary electrical connection to terminals in opposite directions. This dimensional reorganization shortens the current path through the electrode assembly while maintaining proper terminal connectivity.
Solution Approach 2:
The current collector plates serve as an intermediary structure that enables electrical connection between the tabs (positioned in the same direction) and the terminals (in opposite directions). This mediator structure optimizes the current path, reducing electrical resistance while maintaining ease of terminal connection.
4Ease of manufacture
If the current collector plates are positioned in different regions to simplify connection, then the connection is simpler, but the volume occupied increases and space utilization decreases
Solution Approach 1:
The first and second current collector plates are coupled together in a three-dimensional arrangement, merging their functions into a compact integrated structure. This combined configuration simplifies the connection process while occupying minimal space within the case, improving overall space utilization.
Solution Approach 2:
The current collector plates utilize three-dimensional positioning with vertical and lateral coupling, allowing simplified connections to be achieved in a compact volume. The multi-dimensional arrangement enables complex electrical connections without requiring additional horizontal space.
Data Source
AI summary
A secondary battery includes a case having a cylindrical shape, an electrode assembly accommodated in the case and including first tabs protruding in a first direction and second tabs protruding in the first direction, a first current collector plate accommodated in the case and connected to the first tabs, a second current collector plate configured to connect the second tabs to the case, a rivet terminal connected to the first current collector plate and passing through the case, and an insulating member in contact with a perimeter of each of the electrode assembly, the first current collector plate, and the second current collector plate.