Vehicle Battery SOH Estimation via Temperature and Distance
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Solution Overview
Problem
Existing methods for estimating the state of health (SOH) of vehicle batteries are inaccurate due to errors in measuring current, voltage, and impedance, making it difficult to determine the remaining capacity and appropriate charging times.
Innovation Solution
A method and apparatus that measure battery temperature at intervals, calculate severity grades based on temperature distribution data, and use deterioration maps to estimate battery deterioration from traveling distance and temperature, thereby estimating the SOH and remaining traveling distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SOH is estimated from impedance measured or from current and voltage, then estimation can be performed, but measurement errors occur and accuracy deteriorates
Solution Approach 1:
The patent changes the estimation parameters from electrical measurements (current, voltage, impedance) to thermal and operational parameters (temperature distribution over time, traveling distance). By measuring temperature at multiple points and calculating severity grades based on temperature distribution data, the system achieves more reliable SOH estimation without the measurement errors associated with electrical parameters.
2Measurement precision
If temperature measurement is performed continuously, then accurate temperature distribution is obtained, but energy consumption increases
Solution Approach 1:
The patent implements periodic temperature measurement at predetermined intervals rather than continuous measurement. The controller measures temperature distribution data at specific time intervals and accumulates this data over time, achieving accurate temperature profiling while minimizing energy consumption by keeping measurement operations periodic rather than continuous.
3Device complexity
If deterioration is estimated only from traveling distance, then calculation is simple, but accuracy deteriorates due to temperature effects
Solution Approach 1:
The patent merges traveling distance information with temperature distribution data to estimate deterioration. The controller calculates severity grades from temperature data and combines this with traveling distance from a deterioration map, multiplying these factors to estimate degree of deterioration. This combination approach maintains reasonable calculation complexity while significantly improving accuracy by accounting for both operational distance and thermal effects.
Data Source
AI summary
An apparatus and a method for estimating the SOH of a battery of a vehicle are provided, in which degree of deterioration of the battery is estimated from temperature change and traveling distance. Accordingly, the SOH of the battery and remaining traveling distance can be accurately estimated.