Battery Cell Separator Thickness Ratio for Longer Cycle Life
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The thin design of the negative electrode plate in metal battery cells results in poor electrolyte retention, leading to electrolyte depletion and performance degradation, affecting the cycle life of the battery.
Innovation Solution
The thickness ratio of the separator to the negative electrode plate is set to 0.07 ≤ H1/H2 ≤ 241.18, optimizing electrolyte retention and ion transport to prolong the battery's cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separator thickness H1 is increased to improve electrolyte retention, then the cycle life is prolonged, but the ion transport path increases leading to higher liquid-phase impedance and reduced energy density
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness ratio H1/H2 to a specific range (0.07 ≤ H1/H2 ≤ 241.18, preferably 0.15 ≤ H1/H2 ≤ 220.59). This quantitative parameter optimization balances electrolyte retention capacity against ion transport efficiency, resolving the contradiction between cycle life and energy density through precise dimensional control.
2Quantity of substance
If the separator thickness H1 is increased to retain more electrolyte, then performance degradation is mitigated, but the internal space is reduced and ion transport path is lengthened
Solution Approach 1:
The patent uses parameter changes by defining an optimal thickness ratio range for the separator. This allows maximizing electrolyte retention within the constrained internal space by precisely controlling the separator dimension relative to the negative electrode plate, achieving balance between substance quantity and spatial constraints.
3Loss of energy
If the negative electrode plate thickness H2 is decreased for thin design, then energy density is improved, but electrolyte retention ability deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing a specific thickness ratio relationship between the separator and negative electrode plate. This allows the negative electrode plate to maintain thin design for high energy density while the separator thickness is proportionally adjusted to ensure sufficient electrolyte retention, resolving the contradiction through coordinated dimensional optimization.
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 configuration balances electrolyte retention and ion transport, mitigating performance degradation and extending the battery's cycle life while maintaining energy density.
Implementation Method 1
increasing the thickness H1 of the separator enables retention of more electrolyte
Data Source
AI summary
Embodiments of the present application provide a battery cell, a battery, and an electric apparatus. The battery cell includes an electrode assembly, the electrode assembly including a negative electrode plate, a positive electrode plate, and a separator, the separator being configured to isolate the negative electrode plate and the positive electrode plate; where a ratio of a thickness of the separator to a thickness of the negative electrode plate is greater than or equal to 0.07.