Battery Impedance Estimation via Matrix Update
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Solution Overview
Problem
Existing methods for measuring lithium-ion battery impedance are limited by the performance of voltage and current sensors, and are affected by factors like temperature fluctuations and electromagnetic interference, leading to instability and reduced accuracy, especially in mobile power supply applications.
Innovation Solution
A method and apparatus for estimating battery impedance by obtaining an impedance matrix that accounts for temperature and electric charge, updating the matrix based on distances between reference coordinates and element coordinates, and adjusting impedance values using a factor n (0<n<0.5) to improve accuracy and reduce the influence of uncertain factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage and current sensors are used to measure battery impedance, then impedance measurement can be performed, but measurement accuracy is limited by sensor performance and affected by temperature fluctuations and electromagnetic interference
Solution Approach 1:
The patent replaces the traditional sensor-based electrical measurement system with a model-based computational system. Instead of directly measuring impedance through voltage and current sensors that are susceptible to interference, the system uses an equivalent circuit model combined with measured voltage and current signals to calculate impedance through mathematical processing, thereby substituting a physically vulnerable measurement system with a computationally robust one that can filter out temperature and electromagnetic interference effects
Solution Approach 2:
The patent introduces an equivalent circuit model as an intermediary between the raw voltage/current measurements and the final impedance value. This model acts as a mediator that processes the measured signals through mathematical relationships, allowing the system to derive impedance information while compensating for measurement errors caused by environmental factors like temperature fluctuations and electromagnetic interference
2Measurement precision
If high-performance sensors are used to improve impedance measurement accuracy, then measurement precision increases, but cost and space requirements increase
Solution Approach 1:
The patent employs standard, low-cost voltage and current sensors rather than high-performance expensive sensors. By using readily available, inexpensive sensor components and compensating for their limitations through the equivalent circuit model and signal processing algorithms, the system achieves accurate impedance measurements without incurring the high costs and space requirements of premium sensor hardware
Solution Approach 2:
The patent changes the approach from improving hardware sensor parameters to optimizing software and model parameters. Instead of upgrading sensor specifications, the system adjusts and refines the equivalent circuit model parameters and signal processing algorithms to extract accurate impedance information from measurements taken by standard sensors, thereby achieving high precision without increased hardware cost or space
Data Source
AI summary
The disclosure embodiments herein provide a method, an apparatus, a storage medium, and a terminal device for estimating the impedance of a battery. The method includes obtaining an impedance matrix of the battery to be detected, wherein the value of an element of the impedance matrix represents the impedance of the battery and its coordinate in the impedance represents its temperature and quantity of electric charge; detecting the impedance of the battery to obtain a first impedance when its temperature is a first temperature and its quantity of electric charge is a first quantity of electric charge; and updating the impedance matrix of the battery according to the distances between the coordinate forming by the first temperature and the first quantity of electric charge and the coordinates of each element in the impedance matrix, and the first impedance. they can reduce the influence of uncertain factors in the measurement process.