Three-Tab Composite Battery Layout for High Power and Low Self-Discharge
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Solution Overview
Problem
Lithium-ion batteries have low power density compared to supercapacitors, while supercapacitors have low energy density, limiting their application in high energy density requirements, and existing composite batteries suffer from significant self-discharge effects.
Innovation Solution
A three-tab laminated composite battery design with independently connected positive electrode tabs for lithium-ion and supercapacitor plates, allowing for adjustable energy and power densities and reduced self-discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium-ion batteries are used to achieve high energy density, then energy density is improved, but power density deteriorates
Solution Approach 1:
The positive electrode is segmented into two independent parts: a first positive electrode plate for supercapacitor and a second positive electrode plate for lithium-ion battery, each connected to separate positive electrode tabs. This segmentation allows independent optimization of energy storage (supercapacitor side) and power delivery (lithium-ion battery side), resolving the contradiction between energy density and power density.
2Power
If supercapacitors are used to achieve high power density, then power density is improved, but energy density deteriorates
Solution Approach 1:
The patent merges supercapacitor and lithium-ion battery components into a single composite battery structure with shared electrolyte and separator, while maintaining independent electrode connections. This combination allows the system to achieve both high power density (from supercapacitor) and high energy density (from lithium-ion battery) simultaneously.
3Quantity of substance
If composite battery is used to achieve both high energy and power density, then energy and power density are improved, but self-discharge effect worsens
Solution Approach 1:
The patent extracts the supercapacitor positive electrode from the conventional single-positive-electrode design and connects it to a separate positive electrode tab. This extraction allows the supercapacitor component to be electrically isolated during storage, preventing self-discharge while maintaining its high energy density contribution to the composite battery.
Data Source
AI summary
Disclosed is a three-tab laminated composite battery, where the positive electrode plate and the negative electrode plate are alternately stacked, and adjacent plates are separated by the separator; the positive electrode plate comprises a first positive electrode plate and a second positive electrode plate; the first positive electrode plate comprises a first positive electrode current collector and a supercapacitor positive electrode material arranged on both sides; the second positive electrode plate comprises a second positive electrode current collector and a lithium-ion battery positive electrode material arranged on both sides; the first and the second positive electrode plates are connected to a first and a second positive electrode tab respectively and independent of each other; and the negative electrode plate is connected to a negative electrode tab. The composite battery has the advantages of a lithium ion battery and a supercapacitor, and could avoid a self-discharging effect.