Battery State Vector Estimation After Decoupling
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Solution Overview
Problem
Existing battery monitoring systems cannot accurately determine the state of a battery when it is electrically coupled to a load circuit after being decoupled, leading to inaccuracies in state-of-charge estimation.
Innovation Solution
A method and system that calculate a predicted state vector based on a previously determined state vector and time interval of decoupling, measuring battery voltage after recoupling, and adjusting with a voltage error value to estimate the current state vector, using sensors and computational units to refine the estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the battery monitoring system interrupts measurements and calculations during the discharge time interval, then the system can simplify operations during unloading, but it cannot accurately determine the battery state after recoupling to the load circuit
Solution Approach 1:
The system performs preliminary calculations of the predicted state vector during the discharge time interval when the battery is electrically decoupled from the load circuit. This preliminary action allows the system to maintain accuracy without continuous measurement interruptions, as the predicted state vector is ready before recoupling occurs.
Solution Approach 2:
The system uses feedback by comparing the measured battery voltage after recoupling with the predicted battery voltage to calculate a voltage error value. This error feedback is then used to adjust the state vector estimation, ensuring continuous accuracy throughout the discharge and recoupling cycles.
2Measurement precision
If the system continuously measures and calculates battery state during discharge, then accuracy is maintained, but computational resources and measurement frequency increase
Solution Approach 1:
The system performs preliminary calculations of the predicted state vector during the discharge time interval when the battery is electrically decoupled from the load circuit. This preliminary action allows the system to maintain accuracy without continuous measurement interruptions, as the predicted state vector is ready before recoupling occurs.
Solution Approach 2:
The system maintains continuous state estimation capability by combining preliminary predicted state vector calculations with post-recoupling measurements and corrections. This ensures the state vector remains accurately updated throughout the entire discharge-recoupling cycle without requiring continuous active measurement.
Data Source
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AI summary
A system and a method for estimating a state vector associated with a battery are provided. The method includes determining a time interval that the battery has been electrically decoupled from a load circuit. The time interval starts at a first time. The method further includes obtaining a first state vector associated with the battery from a memory. The first state vector is determined prior to the first time. The method further includes calculating a second predicted state vector associated with the battery based on the first state vector and the time interval.