Battery Model Calibration Using Current Pulse Response Matching
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Solution Overview
Problem
Inaccuracies in battery state determination by battery control systems can lead to operational instability and inefficiency, as modeled operational parameters often differ from measured parameters, affecting the reliability and efficiency of battery systems in vehicles and stationary power systems.
Innovation Solution
A system and method for calibrating battery control systems using a design device that supplies calibration current pulses to both the battery pack and model, adjusting model parameters based on differences between measured and modeled responses, and storing validated models and applications for subsequent use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a battery control system uses a battery model to determine battery state, then the battery state determination can be performed, but inaccuracies occur because modeled operational parameters differ from measured parameters
Solution Approach 1:
The patent applies preliminary action by performing calibration of the battery model before actual operation. The calibration process uses calibration current pulses to adjust model parameters in advance, ensuring the battery model accurately reflects the physical battery's behavior before it is deployed for determining battery states during normal operation.
Solution Approach 2:
The patent applies parameter changes by adjusting the battery model parameters based on calibration data. The calibration process modifies parameters such as resistance, capacitance, and other electrical characteristics to minimize the difference between modeled and measured operational parameters, thereby improving accuracy.
2Measurement precision
If calibration current pulses are supplied to adjust model parameters, then matching between modeled and measured parameters improves, but additional calibration equipment and processes are required
Solution Approach 1:
The patent applies self-service by enabling the battery control system to perform its own calibration using the existing battery pack as the calibration object. The calibration process uses the battery's own electrical characteristics and responds to calibration current pulses, allowing the system to self-calibrate without requiring external specialized calibration equipment.
Data Source
AI summary
One embodiment of the present disclose describes systems and methods responsible for reducing errors in a battery model used in the operation of a battery control system. The battery control system may operate based on a modeled response of the battery derived from the battery model. If the battery model is not calibrated/validated, errors in the battery model may propagate through the modeled response of the battery to the operation of the battery control system. A calibration current pulse may result in a different measured response of the battery than the modeled response of the battery to the same calibration current pulse. A validation technique, which uses a difference between the modeled response and the measured response of the battery to the calibration current pulse as a method to calibrate the battery model, may protect the battery control system from the contribution of errors from an uncalibrated battery model.