Ion Battery Electrochemical Modeling With Folded Interface Structures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional battery management systems (BMS) using equivalent circuit models for ion batteries face limitations in accuracy and inability to explain fault mechanisms, making them ineffective for estimating the state of next-generation batteries.
Innovation Solution
A method for establishing an electrochemical model for ion batteries is provided, which involves defining parameters for solid-liquid interface structures in both negative and positive electrode regions, establishing a partial differential equation set and boundary conditions to describe charging and discharging processes, and solving these equations to create an electrochemical model suitable for lithium-ion and sodium-ion batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pseudo two-dimensional model (P2D) is used to describe electrochemical mechanisms, then measurement precision is improved, but device complexity increases and productivity decreases
Solution Approach 1:
The patent segments the solid-liquid interface structure into multiple repeated folded substructures. Each substructure is characterized by simplified geometric parameters (width, depth, thickness), allowing the complex interface to be modeled through repetition of basic units rather than detailed continuous modeling, thus reducing computational complexity while maintaining accuracy.
Solution Approach 2:
The patent introduces specific geometric parameters (width, depth, thickness of folded structures) to characterize the solid-liquid interface. By changing the modeling approach from continuous complex geometry to discrete geometric parameters, the computational burden is reduced while preserving the essential electrochemical characteristics needed for accurate state estimation.
2Device complexity
If single particle model (SPM) is used, then device complexity is reduced, but measurement precision deteriorates due to limitation at lower charge discharge rates
Solution Approach 1:
The patent segments the interface into folded substructures that can capture rate-dependent behavior. The geometric parameters of these folded structures allow the model to represent different charge discharge rates more accurately than SPM, while maintaining computational efficiency through the segmented, repetitive structure rather than full P2D complexity.
3Ease of operation
If equivalent circuit model is used, then device complexity is reduced and ease of operation is improved, but measurement precision deteriorates and reliability decreases
Solution Approach 1:
The patent introduces a geometric model of folded structures as an intermediary between the simple equivalent circuit model and the complex P2D model. This intermediary model incorporates essential electrochemical geometry (solid-liquid interface structure) while maintaining computational simplicity, serving as a bridge that improves accuracy without sacrificing ease of operation.
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 approach balances accuracy and computational speed, providing a more effective method for estimating the state of ion batteries by simplifying the description of electrochemical mechanisms and reducing computational complexity compared to existing models.
Implementation Method 1
a parameter for describing a diffusion depth of ions in the negative electrode solid phase; and the positive electrode parameters include a parameter for describing a diffusion depth of ions in the positive electrode solid phase
Data Source
AI summary
A method for establishing an electrochemical model for an ion battery is provided. The ion battery includes a negative electrode region, a positive electrode region, and a diaphragm arranged between the negative electrode region and the positive electrode region. The negative electrode region includes a negative electrode current collector, a negative electrode liquid phase and a negative electrode solid phase. The positive electrode region includes a positive electrode current collector, a positive electrode liquid phase and a positive electrode solid phase. The method includes: defining negative electrode parameters for describing a solid-liquid interface structure between the negative electrode liquid phase and the negative electrode solid phase in the negative electrode region and positive electrode parameters for describing a solid-liquid interface structure between the positive electrode liquid phase and the positive electrode solid phase in the positive electrode region; establishing a partial differential equation set and a boundary condition for describing a charging process and a discharging process of the ion battery based on the negative electrode parameters and the positive electrode parameters; and solving the partial differential equation set to establish the electrochemical model for the ion battery. Each of the solid-liquid interface structure in the negative electrode region and the solid-liquid interface structure in the positive electrode region is a folded structure, and includes multiple repeated folded substructures.