Pin-Type Battery Energy Density via Center Pin Extraction
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Solution Overview
Problem
Rechargeable batteries with micro diameters have low energy density due to the increased volume of the electrode assembly when a separator and positive electrode are wound around a center pin, limiting their capacity as energy sources for small mobile devices.
Innovation Solution
A pin-type rechargeable battery design where the second electrode is wound around the external circumference of a first electrode with a separator, forming a porous mesh or three-dimensional member, increasing the ion exchange area and allowing for a more efficient use of electrolyte solution, thereby enhancing energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a separator and positive electrode are wound around a center pin to form the electrode assembly, then the battery structure is formed, but the volume of the electrode assembly is increased, resulting in low energy density
Solution Approach 1:
The patent removes the center pin from the battery structure. The electrode assembly is formed by winding the separator and positive electrode around a negative electrode that serves as the central component, rather than winding around a separate center pin. This extraction of the unnecessary center pin reduces the overall volume of the electrode assembly while maintaining the structural integrity and manufacturing feasibility.
Solution Approach 2:
Instead of the conventional approach where a center pin is used as the central element around which other components are wound, the patent inverts this approach by making the negative electrode the central element. The separator and positive electrode are wound around the negative electrode itself, eliminating the need for a separate center pin and reducing volume.
2Ease of manufacture
If the electrode assembly volume is increased to accommodate the center pin structure, then the battery can be manufactured, but the energy density at preset volume is reduced
Solution Approach 1:
The center pin is completely removed from the battery structure. The negative electrode replaces the center pin's positional function while eliminating the redundant volume occupied by the center pin itself, thereby reducing the electrode assembly volume without compromising manufacturability.
Solution Approach 2:
The functional roles of the center pin and the negative electrode are merged. The negative electrode serves both as the active energy-storing component and as the central structural element around which the separator and positive electrode are wound, eliminating the need for a separate center pin and reducing overall volume.
3Adaptability or versatility
If a pin-type battery with micro diameter is formed, then the battery can be used in small devices, but the energy density is low due to increased volume
Solution Approach 1:
By removing the center pin, the patent reduces the volume occupied by non-active components in the micro-diameter battery. This extraction allows the battery to maintain its small size for use in portable devices while increasing the proportion of active materials, thereby improving energy density.
Solution Approach 2:
The patent changes the structural parameters of the electrode assembly by eliminating the center pin and reconfiguring the winding arrangement. This parameter change optimizes the volume utilization of active materials in the micro-diameter battery, improving energy density while maintaining compatibility with small device form factors.
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 design increases energy density at a preset volume by reducing the volume of the electrode assembly and optimizing the ion exchange area, addressing the low energy density issue in micro-diameter rechargeable batteries.
Implementation Method 1
the first electrode forms a wider ion exchange area with the second electrode
Implementation Method 2
The first electrode is formed of a porous mesh member or a three-dimensional member and the first electrode forms a wider ion exchange area with the second electrode while receiving an electrolyte solution therein
Data Source
AI summary
Disclosed is a pin-type rechargeable battery having a micro diameter for increasing an energy density at a preset volume. The rechargeable battery includes: an electrode assembly formed by winding a second electrode around an external circumference of a first electrode disposed at a center thereof by interposing a separator; a case to receive the electrode assembly and an electrolyte solution therein and electrically connected to the second electrode; a terminal electrically connected to the first electrode and drawn outside of the case; and a gasket disposed between the terminal and an opening of the case to close the opening of the case.