Battery State Estimation from Differential Voltage-Capacity Peaks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional battery state diagnosis methods are limited in accurately determining the degradation of batteries based on differential profiles, primarily focusing on peak behavior during charging or discharging, and do not account for various aspects of battery health.
Innovation Solution
A battery management apparatus and method that analyzes differential voltage and capacity profiles to identify target peaks and compares their behavior with reference peaks, allowing for comprehensive assessment of positive electrode capacity and available lithium levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional battery state diagnosis methods are used, then the diagnosis process is simple, but the measurement precision of battery state determination is insufficient
Solution Approach 1:
The patent segments the battery profile into multiple peaks, where each peak corresponds to a specific electrochemical reaction or material phase. By analyzing each peak's behavior separately (position, shape, area), the system achieves comprehensive battery state diagnosis with high precision while maintaining a systematic and manageable approach.
Solution Approach 2:
The patent introduces differential profiles (dV/dQ vs. Q, dQ/dV vs. V) as an additional analytical dimension beyond the conventional voltage-capacity profile. This transformation enables the extraction of more detailed electrochemical information from the same charging/discharging data, improving measurement precision without requiring additional hardware.
2Adaptability or versatility
If only charging or discharging profile is used, then the diagnosis method is simple, but the adaptability to diagnose different battery degradation aspects is limited
Solution Approach 1:
The patent creates a universal diagnosis framework that can identify multiple types of battery degradation (positive electrode capacity loss, negative electrode capacity loss, available lithium loss) using the same differential profile analysis methodology. The system determines battery state by comparing peak behaviors against reference profiles, enabling versatile degradation assessment without requiring separate diagnostic procedures for each degradation type.
Data Source
AI summary
A battery management apparatus 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.