Curved Electrode Battery Cell Layout for Lithium Replenishment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium-ion batteries face significant irreversible lithium ion consumption during the first charge, leading to reduced energy density and shortened service life due to the formation of a solid electrolyte interphase (SEI) film and ongoing lithium loss during use.
Innovation Solution
Incorporating a lithium replenishing apparatus within the battery cell, utilizing curved electrode assembly designs to create an accommodating space for the apparatus, which replenishes active lithium both during the first charge and usage, maximizing energy density without occupying internal space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lithium replenishing apparatus is added to the battery cell, then the service life and energy density of the battery are improved, but the internal space of the battery cell is occupied
Solution Approach 1:
The lithium replenishing apparatus is nested within the accommodating space formed by the curved parts of adjacent electrode assemblies. This nesting approach allows the replenishing apparatus to be integrated into the existing battery structure without requiring additional external space, thereby resolving the contradiction between improving service life through lithium replenishment and maintaining the internal space of the battery cell.
Solution Approach 2:
The patent utilizes the three-dimensional space created by the curved electrode assembly surfaces to position the lithium replenishing apparatus. By transitioning from a two-dimensional planar arrangement to a three-dimensional configuration utilizing the accommodating space between curved surfaces, the apparatus can be accommodated without increasing the overall battery cell volume.
2Quantity of substance
If a lithium replenishing apparatus is added to the battery cell, then the energy density of the battery is improved, but the device complexity increases
Solution Approach 1:
The lithium replenishing apparatus serves multiple functions: it replenishes active lithium during the first charge to increase energy density, and continues to replenish lithium loss during subsequent use to extend service life. This multi-functionality justifies the added device complexity by delivering dual benefits to battery performance.
Solution Approach 2:
The lithium replenishing apparatus is pre-positioned within the accommodating space during battery assembly, and the curved electrode assembly design is predetermined to create this space. This preliminary arrangement of components simplifies the overall device complexity by integrating the replenishing function into the existing structural design rather than adding separate complex systems.
3Reliability
If the lithium replenishing apparatus is made thicker to improve lithium replenishing effect, then the service life is improved, but the internal space of the battery cell is further occupied
Solution Approach 1:
The lithium replenishing apparatus is nested within the accommodating space formed by the curved electrode assemblies. This nesting allows the apparatus to achieve sufficient thickness for effective lithium replenishment while utilizing the naturally formed void space between the curved surfaces, thereby not occupying additional internal space of the battery cell.
Solution Approach 2:
The curved parts of the electrode assemblies create an accommodating space with specific geometric characteristics that can accommodate a lithium replenishing apparatus of optimal thickness. The curvature of the electrode surfaces naturally forms a space that allows the replenishing apparatus to achieve the necessary thickness for effective lithium replenishment without encroaching on the internal space of the battery cell.
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 lithium replenishing apparatus effectively extends battery service life and increases energy density by replenishing lost lithium, improving the battery's performance and efficiency.
Implementation Method 1
a lithium replenishing apparatus, at least part of the lithium replenishing apparatus being disposed in the accommodating space
Data Source
AI summary
Embodiments of the present application provide a battery cell, a battery, and a power consumption apparatus, which could effectively improve performance of the battery without increasing the internal space of the battery. The battery cell includes: at least two electrode assemblies, a surface of each electrode assembly of the at least two electrode assemblies including a curved part, and curved parts of two adjacent electrode assemblies of the at least two electrode assemblies forming an accommodating space; and a lithium replenishing apparatus, at least part of the lithium replenishing apparatus being disposed in the accommodating space.