Battery Impedance Measurement for Detection Line Abnormalities
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Solution Overview
Problem
Existing battery measurement systems face challenges in accurately detecting abnormalities in detection lines due to voltage drops caused by short-circuit switches, which hinder frequent voltage measurements.
Innovation Solution
A battery measurement device and method that uses a signal control unit to output or input an AC signal, a voltage measurement unit to detect voltage variations, and a calculation unit to determine abnormalities based on complex impedance, minimizing voltage drops and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If short-circuit switches are turned on and off to detect abnormalities, then detection capability is improved, but voltage drops occur and measurement accuracy deteriorates
Solution Approach 1:
The patent segments the detection function by using separate short-circuit switches for each battery cell and separate voltage measurement paths. This allows individual cell detection without affecting the entire system's voltage measurement accuracy, resolving the contradiction between detection capability and measurement precision.
Solution Approach 2:
The patent introduces an intermediary measurement mechanism that detects voltage variations caused by AC signals instead of directly measuring during switch operation. This intermediary approach allows abnormality detection while avoiding the direct voltage drops that would compromise measurement accuracy.
2Productivity
If frequent voltage measurements are performed, then real-time monitoring is improved, but voltage drops from switch operation prevent accurate measurement
Solution Approach 1:
The patent employs periodic AC signals to induce voltage variations for detection purposes. This periodic action allows measurements to be taken at specific phases when voltage drops are minimal, enabling frequent measurements while maintaining accuracy through timing-based selection of measurement moments.
3Measurement precision
If waiting periods are introduced after switch operation, then measurement accuracy is improved, but real-time monitoring capability deteriorates
Solution Approach 1:
The patent maintains continuous useful action by using AC signals that continuously induce detectable voltage variations. This eliminates the need for waiting periods after switch operation, as the AC signal provides ongoing measurement opportunities without requiring the system to settle, thus maintaining both accuracy and real-time monitoring capability.
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 method allows for precise detection of abnormalities and precursory signs in battery detection lines by reducing voltage measurement inaccuracies and eliminating the need for waiting periods, enabling real-time monitoring of battery health.
Implementation Method 1
a signal control unit provided on a first electrical path connecting a positive electrode and a negative electrode of the rechargeable battery and configured to cause the rechargeable battery to output a predefined alternating current (AC) signal or to input a predefined AC signal to the rechargeable battery
Implementation Method 2
a voltage measurement unit provided on a second electrical path connecting the positive electrode and the negative electrode of the rechargeable battery and configured to receive, via the second electrical path, voltage variations of the rechargeable battery in response to the AC signal
Data Source
AI summary
A battery measurement device for measuring a state of a rechargeable battery, includes a signal control unit provided on a first electrical path connecting a positive electrode and a negative electrode of the rechargeable battery and configured to cause the rechargeable battery to output a predefined AC signal or to input a predefined AC signal to the rechargeable battery, a voltage measurement unit provided on a second electrical path connecting the positive electrode and the negative electrode of the rechargeable battery and configured to receive, via the second electrical path, voltage variations of the rechargeable battery in response to the AC signal, a calculation unit configured to calculate information on a complex impedance based on the voltage variations, and a determination unit configured to determine an abnormality and a precursory sign of an abnormality in the second electrical path based on the information on the complex impedance.