Battery Lithium Plating Detection via Time-Differential Voltage Peaks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for detecting lithium plating in batteries suffer from low accuracy and often require destructive disassembly or rely on indirect calculations, leading to inaccurate assessments of lithium plating representation amounts.
Innovation Solution
A method involving regular voltage collection after charging, construction of a time-differential voltage curve, and identification of characteristic peak voltages to accurately determine lithium plating, allowing for precise adjustment of charging strategies and battery aging assessments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the battery is disassembled to observe plate status, then the lithium plating representation amount can be directly observed, but the battery is destroyed and pollution may be caused
Solution Approach 1:
The patent replaces the mechanical disassembly method with an electrochemical detection method. By measuring voltage changes during open-circuit time and calculating the time derivative, the system detects lithium plating without physically opening or damaging the battery, thus substituting a non-invasive electrical measurement system for the destructive mechanical observation approach
Solution Approach 2:
The patent introduces voltage measurement and time derivative calculation as intermediary parameters to indirectly detect lithium plating. Instead of directly observing the battery plates, the system uses voltage changes during open-circuit time as a mediator to infer the presence and extent of lithium plating, enabling indirect but accurate detection without battery disassembly
2Object-affected harmful factors
If indirect calculation according to battery aging data is used, then the detection process is non-destructive, but the acquired lithium plating representation amount has low accuracy
Solution Approach 1:
The patent changes the detection parameter from general battery aging data to specific voltage changes during open-circuit time. By focusing on the time derivative of cell potential during this specific period, the method transforms an imprecise indirect calculation into an accurate measurement that specifically captures lithium plating effects without requiring battery disassembly
Solution Approach 2:
The patent utilizes the periodic open-circuit period that naturally occurs after charging to perform detection. By measuring voltage changes during this specific time window and calculating the time derivative, the system captures lithium plating information at the optimal moment when the effect is most pronounced, improving accuracy while maintaining non-destructive detection
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
Enhances the accuracy and convenience of lithium plating detection, enabling safer battery operation by adjusting charging strategies based on precise lithium plating state determination.
Implementation Method 1
by continually measuring the cell potential over a brief period of open-circuit time and then determining the time derivative of the cell potential over a like period of time
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
The present disclosure relates to the technical field of batteries, and provides a method and a system for detecting a lithium plating state of a battery, a vehicle, a device, and a storage medium. The method includes: regularly collecting a voltage of a battery after the end of charging at a preset time interval after the battery is in an idle state, and associatively storing the collected voltage and a collection time of the voltage as voltage data; constructing a time-differential voltage curve in a voltage-time coordinate system according to the voltage data; detecting whether a characteristic peak voltage exists in the time-differential voltage curve; prompting that lithium plating occurs in the battery when detecting the characteristic peak voltage in the time-differential voltage curve; and prompting that the lithium plating does not occur in the battery when detecting no characteristic peak voltage in the time-differential voltage curve.