Battery Impedance Measurement Layout for Induced EMF Error Control
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Solution Overview
Problem
Large-capacity storage batteries are susceptible to measurement errors in complex impedance due to induced electromotive forces generated in electrical paths, which affect the accuracy of battery state assessment.
Innovation Solution
A battery measurement apparatus with a signal control unit, alternating-current signal measuring unit, and calculating unit, where the magnetic flux passage area is set to minimize induced electromotive force errors, using a second electrical path distinct from the first, and incorporating a resistor to correct complex impedance errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a second electrical path is used to measure the alternating-current signal, then the measurement can be performed without directly interfering with the first electrical path, but induced electromotive force is generated in the second electrical path causing measurement errors
Solution Approach 1:
The patent measures the induced electromotive force generated in the second electrical path and uses this harmful effect as a correction term to improve measurement accuracy. By quantifying the error and subtracting it from the raw measurement, the system converts the harmful induced EMF into a useful correction that enhances overall measurement reliability
Solution Approach 2:
The patent implements a feedback mechanism where the induced electromotive force is measured and then used to correct the complex impedance measurement. This closed-loop approach continuously compensates for the measurement error, maintaining high accuracy despite the presence of the second electrical path
2Measurement precision
If the magnetic flux passage area is reduced to minimize induced electromotive force, then measurement accuracy improves, but the design constraints on electrical path layout increase
Solution Approach 1:
The patent changes the parameter of magnetic flux passage area to minimize induced electromotive force. By optimizing the area enclosed by the second electrical path, the system reduces measurement errors while maintaining practical design feasibility. This parameter optimization allows the system to achieve high precision without excessive design 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
The apparatus effectively suppresses measurement errors in complex impedance, ensuring accurate battery state assessment by minimizing induced electromotive force and correcting impedance errors, thereby improving measurement accuracy.
Implementation Method 1
an alternating-current signal measuring unit that is provided on a second electrical path differing from the first electrical path and measures the alternating-current signal flowing through the first electrical path via the second electrical path
Data Source
AI summary
In a battery measurement apparatus, a storage battery is caused to supply an alternating-current signal or receive an alternating-current signal to the storage battery. The alternating-current signal flowing through a first electrical path via a second electrical path is measured. In response to the alternating-current signal, a response signal of the storage battery received. Information related to a complex impedance of the storage battery is calculated based on the alternating-current signal and the response signal. A magnetic flux passage area is defined as an area surrounded by the second electrical path and through which a magnetic flux based on the alternating-current signal flowing through the first electrical path passes. A size of the magnetic flux passage area is set such that an error in the complex impedance due to induced electromotive force based on the alternating-current signal flowing through the first electrical path is within a range of ±1 mΩ.