Dual-Storage Charging to Raise SOC Without Battery Degradation
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Solution Overview
Problem
Fast charging of electrical energy storage systems, particularly in vehicles, leads to significant battery degradation, especially at high State of Charge (SOC) levels, limiting battery lifetime.
Innovation Solution
A method involving a two-stage charging process using a combination of lithium ion battery cells and lithium ion capacitors, where the capacitors are used to further charge the battery cells after initial fast charging, thereby reducing degradation by limiting the SOC of the battery cells and allowing for extended battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fast charging is applied to electrical energy storage systems, then charging speed is improved, but battery degradation increases
Solution Approach 1:
The electrical energy storage system is divided into two separate units: a first electrical energy storage unit (battery cells) and a second electrical energy storage unit (capacitors). This segmentation allows each unit to be optimized for its specific function - the battery provides energy storage while the capacitor handles fast charging, thereby resolving the contradiction between charging speed and battery lifetime by preventing fast charging from directly impacting the battery cells.
2Quantity of substance
If fast charging is applied to achieve high SOC levels, then energy capacity is improved, but battery degradation increases
Solution Approach 1:
The second electrical energy storage unit (capacitor) acts as an intermediary between the external charging source and the first electrical energy storage unit (battery). During fast charging, the capacitor receives electrical energy and subsequently transfers it to the battery, mediating the charging process to avoid direct fast charging of the battery cells. This intermediary approach enables the system to achieve high SOC levels and energy capacity while protecting the battery from degradation-causing fast charging conditions.
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 approach allows for faster charging with reduced battery degradation, enabling vehicles to achieve higher SOC without detrimental effects on battery longevity, thus extending the battery's operational range and lifespan.
Implementation Method 1
The second electrical energy storage unit can comprise at least one capacitor... transferring electrical energy from the second electrical energy storage unit to the first electrical energy storage unit
Data Source
AI summary
The disclosure relates to charging an electrical energy storage system. The electrical energy storage system can comprise a first electrical energy storage unit and a second electrical energy storage unit. A corresponding method can comprise charging the first electrical energy storage unit and the second electrical energy storage unit with electrical energy, and transferring electrical energy from the second electrical energy storage unit to the first electrical energy storage unit, thereby discharging the second electrical energy storage unit.