Cylindrical Battery Cell Electrolyte for Fast Charge and Pressure Stability
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Solution Overview
Problem
Existing battery cells face challenges in enhancing both rate performance and reliability due to issues with electrolyte conductivity and pressure distribution during charge and discharge cycles, leading to decomposition and gas production.
Innovation Solution
The use of a linear ester solvent with a mass percentage greater than or equal to 25.5 wt% in the electrolyte, combined with a cylindrical shell structure, enhances electrolyte conductivity and even pressure distribution, improving both rate performance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a linear ester solvent with mass percentage ≥25.5 wt% is used in the electrolyte, then the conductivity of the electrolyte is improved and rate performance is enhanced, but decomposition and gas production occur during charge and discharge cycles
Solution Approach 1:
The patent changes the chemical composition parameter of the electrolyte by using a linear ester solvent with mass percentage ≥25.5 wt%, which fundamentally alters the electrolyte's conductivity and infiltration properties to improve rate performance while managing decomposition issues
Solution Approach 2:
The patent employs a composite electrolyte system combining linear ester solvent with other components, creating a multi-component mixture that balances high conductivity with reduced decomposition and gas production during battery operation
2Reliability
If a cylindrical shell structure is used, then pressure resistance and reliability are improved through even stress distribution, but the axial dimension becomes much greater than radial dimension resulting in longer electrolyte reflux path
Solution Approach 1:
The patent uses a cylindrical (curved) shell structure that provides even stress distribution and pressure resistance during battery operation, while the curvature geometry inherently creates a longer axial dimension compared to radial dimension
Solution Approach 2:
The patent changes the physical parameter of the electrolyte by using linear ester solvent with low viscosity, which compensates for the longer reflux path in the cylindrical structure by enabling faster and easier infiltration through the electrode assembly
3Stability of the object's composition
If the axial dimension of the battery cell is much greater than the radial dimension, then the cylindrical shell structure provides even pressure distribution, but the reflux path for electrolyte becomes longer making it difficult to fully infiltrate the electrode assembly
Solution Approach 1:
The patent changes the viscosity parameter of the electrolyte by selecting linear ester solvent, which has inherently low viscosity that enables rapid infiltration through the electrode assembly despite the longer axial reflux path required by the cylindrical structure
Solution Approach 2:
The patent optimizes the local quality of the electrolyte composition by using linear ester solvent with specific properties that enhance infiltration capability in the axial direction while maintaining the overall cylindrical structure's pressure distribution advantages
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 combination of the linear ester solvent and cylindrical shell structure improves the battery cell's rate performance and reliability by facilitating fast charging and discharging while preventing shell deformation.
Implementation Method 1
the conductivity of the electrolyte is relatively high, which is conducive to enhancing the liquid phase transport capacity of active ions
Implementation Method 2
the cylindrical structure of the shell of the battery cell enables even distribution of pressure inside the battery cell so that the shell is evenly stressed everywhere
Implementation Method 3
enabling the electrolyte system to have relatively low viscosity and to flow more easily and infiltrate the electrode assembly
Data Source
AI summary
A battery cell includes an electrolyte, an electrode assembly, and a shell. The electrode assembly and the electrolyte are accommodated in the shell, where the shell is a cylindrical structure. The electrolyte includes a linear ester solvent, and a mass percentage of the linear ester solvent in the electrolyte is greater than or equal to 25.5 wt %.