Stacked Secondary Battery Providing Multiple Voltages via Segmented Cells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional secondary batteries cannot provide multiple voltages from a single battery without significant modifications to the internal structure, limiting their application in devices requiring varied operation modes.
Innovation Solution
A stacked-type secondary battery is developed by configuring unit electrode assemblies with different cathode and anode active material compositions, allowing for the simultaneous provision of multiple voltages through the installation of separate electrode terminals on the battery case, without altering the internal structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional secondary batteries are designed to provide multiple voltages, then the battery can supply varied operation modes, but the internal structure must be significantly modified
Solution Approach 1:
The battery is divided into multiple battery cells, each containing unit electrode assemblies with different active material compositions. Each battery cell can independently provide different voltages (e.g., 3.35V, 3.7V, 3.95V), allowing the overall battery to provide multiple operation voltages without complex internal modifications by simply selecting which battery cells to connect.
Solution Approach 2:
Different unit electrode assemblies within the battery have locally differentiated active material compositions. Specifically, cathode active materials include LiCoO2, LiMn2O4, or LiNi0.8Co0.1Mn0.1O2, while anode active materials include graphite, lithium titanate oxide, or lithium phosphorus oxynitride. This local quality differentiation enables each battery cell to have distinct voltage characteristics while maintaining overall battery simplicity.
2Adaptability or versatility
If multiple batteries are used to provide different voltages, then the voltage requirement is met, but the device complexity and space occupation increase
Solution Approach 1:
Multiple battery cells providing different voltages are merged into a single integrated battery structure. The battery includes multiple battery cells with unit electrode assemblies stacked within each cell, all contained within one battery case with a unified external structure. This merging eliminates the need for separate battery assemblies while maintaining the ability to provide multiple voltages through selective connection of internal battery cells.
3Adaptability or versatility
If separate battery cells are used for different voltages, then voltage flexibility is achieved, but the manufacturing process becomes more complex
Solution Approach 1:
The battery is segmented into standardized battery cells, each containing unit electrode assemblies with specific active material compositions. This segmentation allows for modular manufacturing where each battery cell can be produced independently using standardized processes, then assembled into the final battery. The segmented design simplifies manufacturing compared to creating entirely custom multi-voltage batteries.
Solution Approach 2:
The invention uses parameter changes in active material composition to achieve different voltages. By varying the cathode active material (LiCoO2, LiMn2O4, LiNi0.8Co0.1Mn0.1O2) and anode active material (graphite, lithium titanate oxide, lithium phosphorus oxynitride) ratios and types, each battery cell achieves different voltage parameters (3.35V, 3.7V, 3.95V) through a standardized manufacturing process that only needs to adjust material parameters rather than structural design.
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
Enables the delivery of a range of voltages, such as 3.35 to 3.95 V, from a single battery, effectively addressing the need for devices requiring multiple operation voltages without the need for multiple batteries or complex structural modifications.
Implementation Method 1
a cathode containing a cathode active material capable of undergoing intercalation/deintercalation of lithium ions, an anode containing an anode active material capable of undergoing intercalation/deintercalation of lithium ions
Implementation Method 2
a lithium secondary battery refers to a battery comprising an electrode assembly composed of a cathode containing a cathode active material capable of undergoing intercalation/deintercalation of lithium ions
Data Source
AI summary
The present invention relates to a lithium secondary battery comprising a battery cell formed by stacking a plurality of full cells having a structure of cathode/separator/anode or bicells having a structure of cathode(anode)/separator/anode(cathode)/separator/cathode (anode), as a unit electrode assembly, wherein (i) a cathode active material or (ii) an anode active material or (iii) a cathode active material and an anode active material in two or more unit electrode assemblies are configured to have a different composition to induce a voltage difference and separate electrode terminals are installed in a battery case according to the voltage difference to thereby simultaneously provide two or more voltages by a single battery.