Battery Impedance Measurement Layout to Suppress Induced EMF
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Solution Overview
Problem
Existing battery measurement systems face errors in complex impedance calculations due to induced electromotive forces generated by magnetic flux variations, especially in high-capacity batteries, which affect measurement accuracy.
Innovation Solution
The battery measurement system is designed with a battery measurement device that includes a signal control unit and a response signal input unit, where the second electrical path is wired inside the housing case to minimize the magnetic flux passage area, reducing the induced electromotive force and thus the error in complex impedance calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the second electrical path is wired outside the housing case, then the magnetic flux passage area is larger, but the induced electromotive force error increases
Solution Approach 1:
The patent repositions the second electrical path from an external routing to an internal routing within the housing case, fundamentally changing the spatial dimension of the electrical path configuration. This dimensional change reduces the magnetic flux passage area enclosed by the electrical path, thereby minimizing the induced electromotive force error while maintaining measurement functionality
2Object-affected harmful factors
If the second electrical path is routed inside the housing case, then the magnetic flux passage area is reduced, but the wiring complexity increases
Solution Approach 1:
The patent merges the second electrical path with the internal structure of the housing case by routing it inside the housing. This integration combines the electrical path with the existing housing structure, reducing the need for separate external routing and minimizing the magnetic flux passage area without proportionally increasing overall system complexity
3Measurement precision
If the magnetic flux passage area is minimized, then the induced electromotive force error is reduced, but the measurement system complexity increases
Solution Approach 1:
The patent configures the second electrical path to follow an equipotential routing strategy within the housing case, where the path is positioned to minimize exposure to magnetic flux variations. This equipotential configuration reduces induced electromotive force error while maintaining a relatively simple and standardized electrical path design that does not significantly increase system complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This structure enhances the accuracy of complex impedance measurements by suppressing errors within a specified range, ensuring precise determination of battery state parameters like state of charge and health, even under varying battery capacities and temperatures.
Implementation Method 1
The second electrical path is wired from the response signal input unit toward the inside of the housing case so that the magnetic flux passage area surrounded by the electrode body and the second electrical path is smaller in magnitude than an area surrounded by the electrode body, the terminals and the housing case
Data Source
AI summary
A battery measurement system includes: a battery including terminals and a housing case, and a battery measurement device. The battery measurement device includes: a signal control unit provided on a first electrical path connecting positive and negative electrode external terminals and configured to receive or apply an AC signal, a response signal input unit provided on a second electrical path connecting positive and negative electrodes of an electrode body and configured to receive a response signal to the AC signal, and a calculation unit configured to calculate complex impedance information based on the response signal. The second electrical path is wired from the response signal input unit toward the inside of the housing case so that a magnetic flux passage area surrounded by the electrode body and the second electrical path is smaller in magnitude than an area surrounded by the electrode body, the terminals and the housing case.