Battery Cell Electrolyte Retention Using Polymer Electrode and Separator
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Solution Overview
Problem
Current battery cells exhibit poor cycle performance due to electrolyte solution extrusion during charge and discharge cycles, leading to liquid shortage and battery polarization, which deteriorates the cycle life.
Innovation Solution
Incorporating a liquid absorption polymer in the electrode plate and a liquid-retaining polymer in the separator to enhance electrolyte solution absorption and retention, ensuring even soaking and minimizing extrusion during cyclic processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery cell uses conventional electrode plates and separators without liquid absorption polymers, then the device complexity is low, but the cycle performance is poor due to electrolyte solution extrusion during charge and discharge cycles
Solution Approach 1:
The patent incorporates liquid absorption polymers with porous structures into the electrode plate and liquid-retaining polymers with porous structures into the separator. These porous materials enable the electrode plate to reabsorb electrolyte solution and the separator to retain electrolyte, preventing extrusion during cyclic charge and discharge processes and improving cycle performance
Solution Approach 2:
The patent creates composite structures by integrating liquid absorption polymers into the electrode plate matrix and liquid-retaining polymers into the separator matrix. This composite approach combines the functional properties of different polymers to achieve both electrolyte reabsorption and retention, solving the cycle performance problem while maintaining manageable structural complexity
2Reliability
If the battery cell uses conventional separators without liquid-retaining polymers, then the manufacturing process is simple, but liquid shortage occurs during cyclic charge and discharge due to electrolyte solution extrusion
Solution Approach 1:
The separator is constructed with liquid-retaining polymers that possess porous structures, enabling the separator to hold and retain electrolyte solution within its matrix. This prevents electrolyte extrusion during cyclic charge and discharge, ensuring stable battery performance without significantly complicating the manufacturing process
Solution Approach 2:
The liquid-retaining polymer in the separator acts as an intermediary that holds the electrolyte solution and releases it gradually during discharge. This mediator prevents direct electrolyte loss and maintains stable ionic conduction throughout the battery cell during cycling
3Reliability
If the electrode plate uses conventional materials without liquid absorption polymer, then the material cost is low, but electrolyte distribution is uneven leading to poor cycle performance
Solution Approach 1:
The liquid absorption polymer is specifically incorporated into the electrode plate at locations where electrolyte distribution needs improvement. This localized enhancement ensures even electrolyte soaking throughout the electrode plate structure, improving cycle performance without requiring excessive polymer content across the entire 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
Improves stability and cycle performance by ensuring even electrolyte distribution and reducing liquid shortage, thereby enhancing the battery's operational reliability and extending its cycle life.
Implementation Method 1
the liquid absorption polymer helps the electrode plate to reabsorb an electrolyte solution, so that the electrolyte solution soaks the electrode plate more evenly and fully
Implementation Method 2
the liquid absorption polymer helps the electrode plate to reabsorb an electrolyte solution
Implementation Method 3
the separator has a strong liquid-retaining capability. During a cyclic charge and discharge process of the battery cell, the electrolyte solution is not prone to being extruded
Data Source
AI summary
A battery cell, a battery, and an electrical apparatus. The battery cell comprises an electrode assembly which comprises an electrode plate and a separator. The electrode plate comprises a current collector and a film layer which is disposed on at least one surface of the current collector and contains an active material and a liquid absorption polymer, and the electrode plate satisfies: v/λ≥1.2. The separator comprises a liquid-retaining polymer, and the separator satisfies: (m2−M)/(m1−M)≥25%.