Battery State Estimation from Differential Voltage Peak Shifts
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Solution Overview
Problem
Existing battery management systems are limited in accurately diagnosing the state of batteries from various aspects based on the behavior of peaks in differential profiles.
Innovation Solution
A battery management apparatus and method that determines the state of a battery by analyzing the behavior of peaks in differential capacity and voltage profiles, allowing for the identification of lost positive electrode capacity and available lithium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional battery diagnosis methods are used based on charging or discharging profiles, then the diagnosis process is simple, but the accuracy of battery state determination is insufficient
Solution Approach 1:
The patent transforms the conventional charging/discharging profiles into differential profiles by applying differential calculus to the capacity-voltage relationship. This parameter transformation enables the identification of peak points that correspond to specific electrochemical reactions, thereby improving diagnosis accuracy without requiring additional hardware complexity
Solution Approach 2:
The patent segments the battery diagnosis into distinct components by identifying multiple peak points in the differential profile, where each peak corresponds to specific electrochemical processes at different electrodes. This segmentation allows for independent analysis of positive electrode capacity loss and negative electrode lithium loss, improving overall diagnosis precision
2Adaptability or versatility
If conventional peak analysis is used to diagnose battery state, then the analysis is limited to single aspect, but the complexity of comprehensive analysis is avoided
Solution Approach 1:
The patent creates a universal differential profile analysis method that can simultaneously diagnose multiple battery degradation aspects including positive electrode capacity loss, negative electrode lithium loss, and overall battery health. The same differential profile serves multiple diagnostic functions, enabling comprehensive battery state assessment through a single analytical framework
Data Source
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AI summary
A battery management apparatus according to an embodiment of the present disclosure includes: a profile generating unit configured to obtain a battery profile representing a correspondence between voltage and capacity of a battery and generate a differential profile representing a correspondence between a differential voltage for the capacity of the battery and the capacity or a correspondence between a differential capacity for the voltage of the battery and the voltage based on the obtained battery profile; and a control unit configured to receive the generated differential profile from the profile generating unit, determine a target peak included in the received differential profile according to a rule corresponding to a type of the received differential profile, and determine a state of the battery based on a behavior change of the target peak with respect to a reference peak preset to correspond to the type of the received differential profile.