Vehicle Battery State Estimation Using External Reference Feedback
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Solution Overview
Problem
Existing battery state detection systems lack accuracy in assessing the state of rechargeable batteries due to outdated estimation methods and lack of real-time reference information, leading to inefficient battery management and potential vehicle performance issues.
Innovation Solution
A battery state detection device equipped with sensors to measure voltage, current, and temperature, and an estimator that corrects estimation equations and parameters based on reference information obtained from external devices, including battery identification, usage patterns, and historical data, using pulse discharge to optimize equivalent circuit models.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional estimation methods are used for battery state detection, then the device complexity is low, but the measurement precision of battery state is insufficient
Solution Approach 1:
The system implements feedback by obtaining actual battery state information from external devices and using it to correct estimation equations and parameters. The correction information is transmitted back to update the estimation model, creating a closed-loop system that continuously improves detection accuracy without requiring complete system redesign
Solution Approach 2:
The invention changes the parameters of the estimation model by dynamically updating estimation equations and parameters based on external reference information. Instead of using fixed estimation parameters, the system adapts them according to actual battery conditions obtained from external sources, thereby improving measurement precision while maintaining system architecture
2Measurement precision
If real-time reference information is obtained from external devices, then the measurement precision improves, but the loss of time for data transmission occurs
Solution Approach 1:
The system performs preliminary actions by pre-obtaining and storing correction information from external devices when conditions are favorable. Instead of waiting for real-time requests, the system proactively collects reference information and prepares correction data in advance, reducing the time penalty during actual detection operations
3Measurement precision
If estimation equations and parameters are corrected based on external reference information, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The invention introduces an intermediary mechanism by using correction information from external devices as a mediator between actual battery state and estimation model. Instead of directly complexifying the estimation system, the patent uses external reference data as an intermediary to bridge the gap between simple estimation algorithms and accurate battery state detection
Data Source
AI summary
A battery state detection device includes a sensor, communicator circuitry, and estimator circuitry. The sensor is configured to measure at least one of a voltage, a current, and a temperature of a rechargeable battery installed to a vehicle. The communicator circuitry is configured to obtain reference information relating to battery state detection from an external device. The estimator circuitry is configured to estimate a state of the rechargeable battery based on a measured value of the sensor. The estimator circuitry is configured to correct at least one of an estimation equation and a parameter based on the reference information.