Temperature Compensation for Magnetic SOC Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for determining the state of charge (SOC) in lithium ion battery systems are inaccurate due to temperature variations, which affect magnetic property measurements, leading to unreliable SOC estimation.
Innovation Solution
Incorporating magnetic and temperature sensors to measure temperature-dependent magnetic properties, compensating for temperature effects, and using these values as inputs to an SOC estimator to accurately determine the SOC of the battery system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic property measurements are used to determine SOC, then SOC estimation can be performed, but temperature variations cause measurement inaccuracies leading to unreliable SOC estimation
Solution Approach 1:
A temperature compensation mechanism is introduced as an intermediary between the magnetic property sensor and the SOC estimator. The compensation process uses temperature data from a temperature sensor to correct the magnetic property measurements, thereby eliminating the direct harmful effect of temperature variations on measurement accuracy
Solution Approach 2:
The system changes the parameters of the magnetic property measurements by applying temperature-based compensation. The magnetic property values are adjusted according to temperature variations, transforming the raw measurements into compensated values that reflect true SOC conditions independent of temperature effects
2Measurement precision
If temperature compensation is applied to magnetic property measurements, then SOC estimation accuracy is improved, but device complexity increases due to additional sensors and processing
Solution Approach 1:
The controller is designed to perform multiple functions: it processes magnetic property measurements, reads temperature sensor data, performs temperature compensation calculations, and estimates SOC. By making the controller multi-functional, the patent avoids adding separate dedicated hardware for each function, thereby limiting the increase in device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides a precise and reliable method for determining the SOC of lithium ion battery systems by accounting for temperature variations, enhancing the accuracy of SOC estimation and overall battery health assessment.
Implementation Method 1
determining a temperature dependent magnetic property value of a magnetic material proximate a battery cell
Implementation Method 2
determining a temperature dependent reference magnetic property value of a second magnetic material... said second magnetic material in thermal equilibrium with said battery cell
Data Source
AI summary
An exemplary embodiment includes a method of determining a state of charge of a battery system including determining a temperature dependent magnetic property value of a magnetic material proximate a battery cell; determining a temperature compensated value of said determined magnetic property value; and, using said temperature compensated value as an input to a state of charge (SOC) estimator to determine a state of charge (SOC) of said battery system.