Battery Profile Matching for Electrode Side-Reaction Diagnosis
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Solution Overview
Problem
Existing battery technologies struggle to accurately diagnose the state of degradation by quantitatively separating lithium loss and side-reactions at the positive and negative electrodes, leading to safety issues due to gas generation and pressure increases.
Innovation Solution
A battery managing apparatus and method that calculates the lithium loss rate, negative electrode side-reaction rate, and positive electrode side-reaction rate by adjusting reference profiles to match the battery's current state, using a profile acquisition unit, determination unit, and control unit to quantify these rates and set appropriate usage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional battery diagnosis methods are used, then the diagnosis process is simple, but the measurement precision of lithium loss and side-reaction rates is insufficient
Solution Approach 1:
The patent segments the battery electrode system into positive electrode and negative electrode components, and separately diagnoses lithium loss, positive electrode side-reactions, and negative electrode side-reactions. This segmentation enables precise measurement of each component's degradation rate independently, resolving the measurement precision issue while maintaining manageable system complexity through modular diagnosis architecture.
2Reliability
If battery degradation is not accurately diagnosed, then the device complexity is low, but the reliability of battery safety is compromised
Solution Approach 1:
The patent implements a feedback mechanism where the battery managing apparatus continuously monitors voltage and current, calculates state of charge, and diagnoses lithium loss and side-reaction rates in real-time. The system uses this diagnostic feedback to adjust charging/discharging conditions, preventing dangerous degradation states and improving battery safety reliability through closed-loop control.
3Loss of information
If quantitative separation of lithium loss and side-reactions is not implemented, then the measurement process is simpler, but the loss of information about electrode-specific degradation occurs
Solution Approach 1:
The patent applies local quality analysis by separately diagnosing the positive electrode and negative electrode regions. It calculates distinct lithium loss rates and side-reaction rates for each electrode based on their specific electrochemical characteristics and voltage profiles, preventing information loss about electrode-specific degradation mechanisms while managing measurement complexity through region-specific analysis methods.
Data Source
AI summary
A battery managing apparatus according to one embodiment of the present disclosure includes: a profile acquisition unit configured to obtain a battery profile representing the relationship between voltage and capacity of the battery; a profile determination unit configured to adjust a preset reference positive electrode profile and reference negative electrode profile to correspond to the battery profile and determine the positive electrode profile and negative electrode profile of the battery; and a control unit configured to calculate the lithium loss rate of the battery based on the positive electrode profile, calculate the negative electrode side-reaction rate of the battery based on the battery profile, and calculate the positive electrode side-reaction rate of the battery based on the lithium loss rate and the negative electrode side-reaction rate.