Battery State of Health Estimation Using Partial Discharge Normalization
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Solution Overview
Problem
Existing methods for estimating the state of health (SOH) of batteries require fully charging or discharging, which is time-consuming and inefficient, and do not effectively predict the remaining life based on partial discharge or charge times.
Innovation Solution
A method and apparatus that measure voltage and partial discharge or charge times, normalize these using a battery model, calculate full discharge or charge times, and estimate SOH based on a ratio with a reference battery, allowing for prediction of cathode active material loss and battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full charging or discharging is performed to estimate SOH, then measurement accuracy is improved, but time consumption increases
Solution Approach 1:
The patent applies partial action by performing SOH estimation using only partial discharge or charge data rather than requiring complete full-cycle charging or discharging. The method measures voltage and time during a partial discharge process, normalizes this data using a battery model, and calculates SOH based on the normalized partial discharge characteristics, thereby significantly reducing the time required while maintaining estimation accuracy.
2Productivity
If partial discharge time measurement is used to estimate SOH, then time efficiency is improved, but measurement complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing a battery model that contains normalized discharge characteristics stored in advance. During actual SOH estimation, the system only needs to measure partial discharge voltage and time, then retrieve and compare against the pre-stored normalized model data, avoiding the need to perform complex normalization calculations in real-time and thus reducing measurement complexity.
3Measurement precision
If a normalized battery model is used, then estimation accuracy is improved, but data processing complexity increases
Solution Approach 1:
The patent applies copying by creating a normalized battery model that serves as a reference copy of ideal discharge characteristics. The actual partial discharge measurements are compared against this pre-established model copy to determine SOH, simplifying the processing by replacing complex real-time normalization with straightforward comparison against the stored model data.
Data Source
AI summary
A method and apparatus for estimating a state of health (SOH) of a battery are provided. The method includes measuring a voltage and a partial discharge time of the battery, acquiring a normalized partial discharge time using a battery model of a reference battery normalized with respect to a time, calculating a full discharge time of the battery based on the partial discharge time and the normalized partial discharge time, and estimating the SOH based on a ratio between a stored full discharge time of the reference battery and the full discharge time of the battery.