Hybrid Electrode Assembly Integrating Capacitor and Battery
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Solution Overview
Problem
Conventional secondary batteries face challenges in high current charge and discharge efficiency, leading to reduced capacity when used in applications like GSM systems, and the integration of capacitors to enhance output is complicated and costly, with manufacturing difficulties and high costs due to the need for expensive active carbon materials.
Innovation Solution
A hybrid type electrode assembly is created by integrating a capacitor and a secondary battery into a single cell using a simplified manufacturing process, with graphite as the electrode material for the capacitor type electrode groups, allowing for increased surface area and reduced costs, and using a stacking/folding type structure to enhance stability and prevent cycle degeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a capacitor is coupled to a secondary battery to enhance instantaneous output, then the high-output characteristics are improved, but the manufacturing process becomes complicated and installation space increases
Solution Approach 1:
The patent merges the capacitor and secondary battery into a single integrated electrode assembly structure. The capacitor electrode group and secondary battery electrode groups are stacked together with shared separators and current collectors, creating a unified manufacturing process that eliminates the need for separate assembly operations while maintaining both high-output and energy storage functions
Solution Approach 2:
The electrode assembly structure serves multiple functions simultaneously: the stacked electrode groups provide both capacitive energy storage and battery energy storage, while the shared separators and current collectors provide both electrical connection and physical separation functions, reducing overall system complexity
2Power
If active carbon material is used for capacitor electrodes, then the electric double-layer capacitance is improved, but the manufacturing cost increases significantly
Solution Approach 1:
The patent replaces expensive active carbon material with cheaper graphite material for the capacitor electrode. While graphite has lower theoretical capacitance than active carbon, the integrated battery-capacitor structure compensates for this by utilizing the secondary battery's energy storage capacity, achieving acceptable overall performance at reduced material cost
Solution Approach 2:
The patent uses a composite electrode structure where graphite-based capacitor electrodes are combined with lithium cobalt oxide and graphite secondary battery electrodes in a stacked configuration, creating a hybrid system that leverages the advantages of different materials while mitigating their individual limitations
3Ease of manufacture
If the capacitor electrode group uses a simple structure, then the manufacturing ease is improved, but the charge and discharge efficiency at high current becomes insufficient
Solution Approach 1:
The patent divides the electrode assembly into multiple stacked electrode groups (capacitor electrode group and secondary battery electrode groups) that can be manufactured separately and then assembled together. This segmentation allows each component to be optimized for its specific function while maintaining overall manufacturing efficiency through standardized assembly processes
Solution Approach 2:
The patent transitions from a single-plane electrode arrangement to a three-dimensional stacked configuration, where capacitor and battery electrode groups are arranged in layers. This dimensional change increases the effective surface area for charge transfer and improves high-current efficiency without complicating the manufacturing process
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 hybrid battery achieves improved high-output and high-energy density characteristics, with enhanced charge and discharge performance in pulse discharge modes, such as GSM, while maintaining cost-effectiveness and preventing capacity degeneration.
Implementation Method 1
The electric double-layer capacitor is a device that stores electric charges by charging ions on an electrolyte and electrons on an electrode at an electric double-layer formed at the interface between the electrode and the electrolyte
Implementation Method 2
The pseudo capacitor is a device that stores electrons adjacent to the surface of an electrode material using a Faraday reaction
Data Source
AI summary
Disclosed herein are a hybrid type electrode assembly including a plurality of electrode groups that can be charged and discharged, wherein the respective electrode groups are constructed in a structure in which a cathode and an anode are opposite to each other while a separator is disposed between the cathode and the anode, and at least one of the electrode groups is a capacitor type electrode group, and a secondary battery including the same. In the hybrid type electrode assembly according to the present invention, a coupled system of a capacitor and a secondary battery is embodied in a single cell through a simplified manufacturing process. Consequently, the present invention has the effect of reducing the manufacturing costs of the battery cell and improving the pulse charge and discharge characteristics without the degeneration of capacity.