Wound Electrode Assembly With Guide Holes to Reduce Lithium Plating
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Solution Overview
Problem
Lithium plating is a common abnormal phenomenon in lithium batteries, leading to reduced charging efficiency, energy density, and potentially causing internal short-circuits and thermal runaway, posing a safety risk.
Innovation Solution
The electrode assembly includes a positive electrode plate with first active substance layer regions and a first inactive substance layer region, where the first inactive substance layer region is provided with guide flow through holes penetrating both sides of the positive electrode plate, facilitating electrolyte flow and infiltration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If lithium-ions detach from the positive electrode quickly during charging, then charging speed increases, but lithium plating occurs on the negative electrode surface reducing safety
Solution Approach 1:
The patent applies local quality by creating an inactive substance layer region with guide flow through holes at specific locations on the positive electrode plate. This localized modification allows electrolyte to accumulate and flow preferentially in certain areas, controlling lithium ion detachment rates locally to prevent plating while maintaining overall charging speed.
Solution Approach 2:
The inactive substance layer acts as an intermediary between the active substance layers, mediating the flow of electrolyte and lithium ions. The guide flow through holes in this intermediate layer regulate electrolyte distribution, ensuring balanced lithium ion detachment across the electrode and preventing localized plating during fast charging.
2Reliability
If the positive electrode plate structure is modified with inactive substance layer regions and guide flow through holes, then electrolyte infiltration improves and lithium plating reduces, but device complexity increases
Solution Approach 1:
The patent segments the positive electrode plate into multiple regions: active substance layer regions for lithium ion storage and inactive substance layer regions with guide flow through holes for electrolyte control. This segmentation allows independent optimization of each region's function, improving plating prevention while keeping the overall structure manageable through modular design.
Solution Approach 2:
The inactive substance layer region incorporates guide flow through holes creating a porous structure that facilitates controlled electrolyte infiltration. This porous design enhances electrolyte distribution and lithium ion detachment control without requiring complex external systems, achieving reliability improvement with moderate structural complexity.
3Quantity of substance
If more guide flow through holes are added to the inactive substance layer region, then electrolyte infiltration effect improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies partial action by adding guide flow through holes only in the inactive substance layer region rather than throughout the entire electrode plate. This selective placement provides sufficient electrolyte infiltration improvement while minimizing the number of holes that need to be manufactured, thereby reducing fabrication complexity compared to comprehensive hole distribution.
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 reduces the deintercalation of lithium ions from the positive electrode, decreases lithium plating, and enhances the electrolyte infiltration effect, thereby improving the safety and performance of lithium batteries.
Implementation Method 1
the first guide flow through hole is configured to penetrate both sides in a thickness direction of the positive electrode plate... facilitates flow of an electrolyte between the electrode plates, improves an infiltration effect of the electrolyte on the electrode assembly
Implementation Method 2
Lithium-ions that cannot be intercalated in the negative electrode can only gain electrons on a surface of the negative electrode due to abnormalities such as insufficient space for lithium to be intercalated in the negative electrode, excessive resistance to lithium-ion migration
Data Source
AI summary
An embodiment of the present application provides an electrode assembly, a battery cell, a battery, and an electrode assembly manufacturing method and device, which belong to the technical field of batteries. The electrode assembly includes a positive electrode plate and a negative electrode plate, the positive electrode plate and the negative electrode plate being wound in a winding direction and forming a winding structure. The positive electrode plate comprises a plurality of first active substance layer regions and at least one first inactive substance layer region; and in an axial direction of the winding structure, the first inactive substance layer region is located between two adjacent first active substance layer regions, wherein, the first inactive substance layer region is provided with a first guide flow through hole, and the first guide flow through hole is configured to penetrate both sides in a thickness direction of the positive electrode plate.