Cylindrical Battery Cell Electrolyte for Fast Charge and Pressure Reliability
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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 liquid phase transport capacity is enhanced, but decomposition and gas production occur during charge and discharge cycles
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by using a linear ester solvent with specific mass percentage (≥25.5 wt%), which modifies the electrolyte's conductivity and transport 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 leverages the high conductivity of linear ester while mitigating its decomposition tendencies through synergistic interactions with other electrolyte constituents
2Strength
If a cylindrical shell structure is used, then pressure resistance is 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 adopts a cylindrical (curved) shell structure that provides uniform stress distribution and enhanced pressure resistance through its geometric curvature, distributing mechanical loads evenly across the shell surface during battery operation
Solution Approach 2:
The patent modifies the physical parameters of the electrolyte by using linear ester solvent with low viscosity, which compensates for the longer axial reflux path in the cylindrical design by enhancing the electrolyte's flow characteristics and reducing resistance to movement
3Productivity
If linear ester solvent is used to reduce viscosity and improve flow, then fast charging and discharging capabilities are enhanced, but the mass percentage must be precisely controlled to maintain stability
Solution Approach 1:
The patent precisely controls the mass percentage parameter of linear ester solvent in the electrolyte (≥25.5 wt%), optimizing the balance between viscosity reduction for fast charging capability and compositional stability, thereby achieving high rate performance with manageable composition control
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 fast charging and discharging capabilities of the battery cell while increasing its pressure resistance, thereby enhancing both rate performance and reliability.
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
Figure 1~2
Figure 3~4
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AI summary
This application is related to a battery cell (7), a battery (2), and an electric apparatus. The battery cell (7) includes an electrolyte, an electrode assembly (10), and a shell (20). The electrode assembly (10) and the electrolyte are accommodated in the shell (20), where the shell (20) 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%. The rate performance and reliability of use of the battery cell (7) in embodiments of this application can be improved.