Secondary Battery Impedance Measurement Mode Switching
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Solution Overview
Problem
Conventional impedance measurement apparatuses for secondary batteries require longer measurement times and higher electric current consumption when attempting to accurately ascertain battery characteristics by measuring complex impedance across multiple frequencies, leading to inefficiencies.
Innovation Solution
An impedance measurement apparatus that switches between multiple measurement modes based on correlating parameters and threshold values, optimizing measurement conditions such as frequency, current output, voltage measurement accuracy, and data quantity to reduce measurement time and electric current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the complex impedance is measured with respect to more frequencies and the number of measurements is increased, then the measurement accuracy is improved, but the measurement time becomes long and the electric current consumption becomes large
Solution Approach 1:
The patent applies dynamics by making the measurement mode adjustable and switchable based on measurement conditions. The measurement unit can dynamically switch between a first measurement mode (measuring impedance at one frequency) and a second measurement mode (measuring impedance at multiple frequencies) according to the measured value of a correlating parameter, thereby optimizing the balance between measurement accuracy and measurement time.
Solution Approach 2:
The patent changes the measurement parameters (frequency count, number of measurements) based on the measured correlating parameter. When the correlating parameter indicates low accuracy, the system switches to a mode with more frequencies and more measurements. When the correlating parameter indicates sufficient accuracy, the system uses fewer frequencies and measurements, thus resolving the contradiction between accuracy and time consumption.
2Measurement precision
If the complex impedance is measured with respect to more frequencies and the number of measurements is increased, then the measurement accuracy is improved, but the electric current consumption becomes large
Solution Approach 1:
The measurement unit dynamically adjusts the measurement mode based on the correlating parameter measurement. When high accuracy is needed, it switches to the second measurement mode with multiple frequencies and measurements. When the correlating parameter shows sufficient accuracy, it uses the first measurement mode with single frequency, thereby reducing electric current consumption while maintaining necessary measurement accuracy.
Solution Approach 2:
The system changes measurement parameters (number of frequencies, number of measurements) based on the correlating parameter value. This adaptive parameter adjustment ensures that the battery undergoes unnecessary current consumption only when truly needed for improved accuracy, resolving the contradiction between measurement precision and energy consumption.
3Device complexity
If a single measurement mode is used regardless of the correlating parameter, then the device complexity is reduced, but the measurement time and electric current consumption cannot be optimized
Solution Approach 1:
The patent introduces a switching unit that enables dynamic selection between measurement modes based on the correlating parameter. This adds controlled complexity to the device, allowing it to adapt measurement conditions (single frequency vs. multiple frequencies) to optimize measurement efficiency and reduce unnecessary time and energy consumption.
Solution Approach 2:
The system incorporates the ability to change measurement parameters based on the correlating parameter measurement results. This controlled parameter variation introduces necessary device complexity that enables optimization of measurement efficiency, resolving the contradiction between device simplicity and measurement productivity.
Data Source
AI summary
An impedance measurement apparatus is provided for measuring impedance of a secondary battery. The impedance measurement apparatus includes a measurement unit and a switching unit. The measurement unit is capable of measuring the impedance of the secondary battery using a plurality of measurement modes differing in measurement condition. The switching unit is configured to switch between the plurality of measurement modes based on a comparison between a correlating parameter, which correlates with the impedance of the secondary battery, and a threshold value.