Battery State of Charge Estimation Using Precharacterization
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Solution Overview
Problem
Existing methods for determining the state of charge of a battery are time-consuming, as they require measuring the open terminal voltage until it reaches a steady state, which can take several hours, making it difficult to implement in situations where the battery is subjected to higher loads before reaching this state.
Innovation Solution
A method and apparatus that detect the terminal voltage of a battery under low current load before it reaches a steady state, using precharacterization parameters specific to the battery type to estimate the state of charge, allowing for quicker determination with desired accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the open terminal voltage is measured until it reaches a steady state to determine the state of charge, then the accuracy of the state of charge determination is improved, but the measurement time increases significantly
Solution Approach 1:
The patent applies preliminary action by pre-characterizing batteries during manufacturing to create reference data sets that contain the relationship between open terminal voltage and state of charge. This pre-characterization allows the system to quickly determine state of charge by comparing real-time voltage measurements against the stored reference data, eliminating the need to wait for steady state while maintaining high accuracy.
Solution Approach 2:
The patent uses copying by creating a digital replica of the battery's voltage-state of charge relationship through pre-characterization. Instead of physically waiting for the battery to reach steady state, the system copies the expected steady-state voltage values from the reference data set and uses them for immediate state of charge determination, significantly reducing measurement time.
2Productivity
If multiple voltage measurements are taken during relaxation operation with extrapolation, then the state of charge can be determined rapidly, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-characterizing batteries during manufacturing to create reference data sets that contain the relationship between open terminal voltage and state of charge. This pre-characterization allows the system to quickly determine state of charge by comparing real-time voltage measurements against the stored reference data, eliminating the need for complex extrapolation algorithms while maintaining high accuracy.
Solution Approach 2:
The patent uses copying by creating a digital replica of the battery's voltage-state of charge relationship through pre-characterization. Instead of using complex mathematical extrapolation, the system copies the expected voltage values from the reference data set and uses them for immediate state of charge determination, reducing both computational complexity and device complexity.
Data Source
AI summary
Methods and apparatuses for determining a state of charge of a battery are provided, wherein measurements of a terminal voltage of the battery and stored precharacterization parameters are used for determining the state of charge.