Battery Differential Profile Correction for Fast State Diagnosis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery diagnosis methods require low-rate charging and discharging to accurately diagnose the state of the battery, leading to inefficiencies and prolonged diagnosis times due to the inclusion of overvoltage in profiles generated at higher C-rates.
Innovation Solution
A battery information providing apparatus and method that acquires a differential profile based on capacity and voltage, determines a target cycle and C-rate, and corrects the profile using pre-stored overvoltage profiles to generate a corrected profile, thereby removing overvoltage noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If low-rate charging and discharging is performed to accurately diagnose battery state, then measurement precision is improved, but productivity deteriorates due to prolonged diagnosis time
Solution Approach 1:
The patent pre-calculates and stores overvoltage profiles for multiple C-rates and cycle conditions before actual battery diagnosis. When diagnosing, the system retrieves the appropriate pre-calculated overvoltage profile and subtracts it from the measured profile, eliminating the need to perform slow low-rate charging/discharging for each diagnosis while maintaining accuracy through pre-computed correction data
Solution Approach 2:
The patent creates corrected battery profiles by copying and subtracting pre-stored overvoltage profiles from measured profiles at various C-rates. This allows the system to generate accurate diagnosis profiles quickly by combining measured data with pre-computed correction profiles rather than performing time-consuming low-rate tests
2Productivity
If high C-rate charging and discharging is performed to improve productivity, then diagnosis time is reduced, but measurement precision deteriorates due to overvoltage inclusion
Solution Approach 1:
The patent extracts the overvoltage component from the measured battery profile by subtracting a pre-stored overvoltage profile (corresponding to the same C-rate and cycle) from the measured profile. This extraction process removes the harmful overvoltage effect while preserving the useful battery state information, enabling accurate diagnosis even at high C-rates
Solution Approach 2:
The patent changes the parameter of the battery profile by subtracting the overvoltage profile from the measured profile, transforming it into a corrected profile that reflects the true battery state without overvoltage distortion. This parameter transformation allows accurate state assessment regardless of the C-rate used for measurement
Data Source
AI summary
A battery information providing apparatus according to an embodiment of the present disclosure includes: a profile acquisition unit that acquires a differential profile based on a capacity and a voltage of a battery; and a control unit that determines a target cycle corresponding to the battery and a target C-rate (current-rate) corresponding to the differential profile, and correct the differential profile based on an overvoltage profile corresponding to the target cycle and the target C-rate, thereby generating a corrected profile.