Rechargeable Battery Voltage Simulation for Lithium Plating State Detection
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Solution Overview
Problem
Existing methods for detecting lithium plating in rechargeable batteries are complex and difficult to implement during the operational use of batteries, especially in dynamic real-world applications.
Innovation Solution
A method that involves receiving operating values such as terminal voltage and battery current, determining a simulated terminal voltage using a battery model, comparing this simulated voltage with the actual terminal voltage, and determining the lithium plating state based on this comparison.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex physical measurement methods such as neutron diffractometry are used to detect lithium plating, then measurement precision is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent creates a virtual copy of the battery's electrical behavior through mathematical modeling. Instead of using complex physical measurement equipment, the system simulates the battery's voltage response under various conditions and compares it with actual measurements to detect lithium plating. This virtual modeling approach replaces sophisticated physical instruments with computationally intensive but operationally simple analysis methods.
Solution Approach 2:
The patent replaces physical measurement systems (neutron diffractometry equipment) with an electrical-field-based detection system. By substituting mechanical/physical measurement apparatus with electrical measurements and mathematical analysis, the system achieves comparable detection capability with significantly reduced complexity and improved ease of operation.
2Ease of operation
If voltage plateau methods are used to verify lithium plating, then ease of operation is improved, but reliability deteriorates under dynamic discharge conditions
Solution Approach 1:
The patent transitions from static voltage plateau analysis to a dynamic detection approach. The system continuously monitors voltage during discharge and compares it with time-dependent simulated voltage profiles. This dynamic comparison method maintains operational simplicity while significantly improving reliability under varying discharge conditions, as it accounts for the temporal evolution of voltage characteristics rather than relying on static plateau identification.
Solution Approach 2:
The patent changes the detection parameter from static voltage plateau presence to dynamic voltage deviation over time. By analyzing how voltage evolves during discharge and comparing it with simulated profiles, the system maintains ease of operation through simple voltage measurements while improving reliability by capturing the temporal dynamics that distinguish lithium plating from normal discharge behavior.
3Measurement precision
If post-mortem analysis with electron microscope photographs is used, then measurement precision is improved, but loss of time increases and productivity decreases
Solution Approach 1:
The patent performs preliminary detection during normal battery operation rather than requiring post-mortem analysis. By continuously monitoring voltage during discharge and comparing it with simulated profiles, the system detects lithium plating in real-time, eliminating the need for time-consuming post-operation microscopy while maintaining detection accuracy and preserving battery productivity.
Data Source
AI summary
A method for characterizing a rechargeable battery (91-96) that is at risk of lithium plating comprises: receiving (1001) operating values (41) of the battery (91-96) as time-series, wherein the operating values of the battery comprise a terminal voltage of the battery (U(t)) and a battery current of the battery (I(t)), determining (1002) a simulated terminal voltage (USim(t)) using a model of the battery (400) on the basis of the battery current (I(t)), comparing (1003) the simulated terminal voltage (USim(t)) with the terminal voltage (U(t)), determining (1004, 1004a, 1004b) a lithium plating state of the battery on the basis of the comparison.