Battery Cell Geometry for Electrolyte-Fed Anti-Plating Discharge
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Solution Overview
Problem
Lithium plating occurs during battery discharging due to the inability to draw electrolyte solution into the gap between electrode plates, impairing battery performance.
Innovation Solution
A battery cell design with a bare cell structure that is higher in the middle and lower at the edges, ensuring the edges are immersed in the electrolyte solution, allowing the solution to be drawn into the gap between the electrode plates, reducing lithium plating and maintaining high performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery uses a conventional flat bare cell structure, then the manufacturing is simple, but the electrolyte solution cannot be drawn into the gap between electrode plates during discharging, causing lithium plating
Solution Approach 1:
The bare cell is designed with an asymmetric structure where the middle region is higher than the two opposite extension ends. This asymmetric height distribution creates a specific geometry that enables the electrolyte solution to be drawn into the gap between electrode plates during discharging, preventing lithium plating while maintaining manufacturing feasibility.
Solution Approach 2:
The invention introduces a height dimension variation to the otherwise flat bare cell structure. By making the middle region higher than the ends, the design adds vertical dimensionality to the fluid dynamics, enabling electrolyte solution movement into the electrode gap through height-driven flow paths.
2Reliability
If the bare cell structure is modified to have higher middle region and lower extension ends, then electrolyte solution can be drawn into electrode gaps, but the manufacturing precision requirements increase
Solution Approach 1:
The bare cell structure implements local quality variation by making the middle region higher than the extension ends. This localized height difference is strategically positioned to create the necessary electrolyte flow paths, concentrating the structural complexity only where needed rather than requiring uniform precision across the entire cell.
3Power
If the battery operates at high capacity, then the power output is sufficient for electric vehicles and energy storage, but the electrode plates shrink significantly during charging-discharging, exacerbating electrolyte distribution problems
Solution Approach 1:
The asymmetric bare cell structure is pre-designed with higher middle region and lower ends before the battery operates. This preliminary structural configuration ensures that electrolyte solution can be drawn into the electrode gaps from the beginning of operation, proactively preventing lithium plating issues before they occur during high-capacity charging-discharging cycles.
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 design effectively reduces the probability of lithium plating and ensures high battery performance by ensuring a sufficient electrolyte solution is available between the electrode plates during discharging.
Implementation Method 1
the positive electrode plate and the negative electrode plate can draw the electrolyte solution into the gap between the two electrode plates through the edges
Data Source
AI summary
This application discloses a battery cell and a battery pack. The battery cell includes a housing and a bare cell located in an inner cavity of the housing. The bare cell includes at least two opposite extension ends and a middle region located between the two opposite extension ends of the bare cell. The two opposite extension ends of the bare cell are configured to be lower than the middle region of the bare cell in a height direction. The bare cell of this cell forms a structure that is high in the middle and low at edges, and a liquid level height of an electrolyte solution in the housing is below the middle region of the bare cell and above extension ends.