Battery Differential Profile Peak Matching for Electrode Diagnosis
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Solution Overview
Problem
Current battery diagnosis methods are destructive and pose safety risks, such as explosions, making it impossible to directly assess the state of positive and negative electrodes, necessitating a non-destructive diagnostic approach.
Innovation Solution
An apparatus and method that utilize a profile obtaining unit to generate a differential profile of battery voltage and capacity, and a control unit to compare target peaks with reference peaks to determine the battery's state, allowing for non-destructive diagnosis of electrode deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external impedance measurement is performed to diagnose battery status, then battery safety can be monitored, but the measurement accuracy is insufficient to detect early-stage battery degradation
Solution Approach 1:
The patent introduces an external AC signal as an intermediary to excite the battery and reveal its impedance characteristics. By applying a known AC voltage signal and measuring the resulting current response, the system can accurately determine battery impedance without directly measuring the battery's inherent impedance, which is too small to detect reliably with conventional methods.
Solution Approach 2:
The patent transforms the impedance measurement problem into an AC signal response measurement problem. By changing from DC resistance measurement to AC impedance measurement with frequency-domain analysis, the system can detect subtle changes in battery internal impedance that indicate early-stage degradation, thereby improving measurement precision while maintaining safety monitoring reliability.
2Measurement precision
If battery impedance is measured using conventional methods, then the measurement process is simple, but the measurement accuracy is insufficient for early degradation detection
Solution Approach 1:
The patent uses an AC signal generator and analyzer as intermediary devices to enable accurate impedance measurement. While this increases device complexity compared to simple ohmmeters, it provides the necessary capability to detect early battery degradation through precise AC impedance characterization that conventional DC methods cannot achieve.
Solution Approach 2:
The patent replaces simple electrical resistance measurement with AC impedance spectroscopy, substituting a more sophisticated measurement approach that uses frequency-domain analysis. This substitution enables detection of early degradation mechanisms that are invisible to conventional measurement methods, justifying the increased system complexity.
3Productivity
If AC impedance measurement is performed at a single frequency, then the measurement is quick and simple, but the diagnostic information is insufficient for comprehensive battery health assessment
Solution Approach 1:
The patent performs impedance measurements at multiple frequencies in advance to build a comprehensive impedance spectrum profile of the battery. By pre-acquiring impedance data across different frequencies, the system can later diagnose various battery conditions more accurately without requiring time-consuming single-frequency measurements during actual diagnosis.
Solution Approach 2:
The patent uses periodic AC signals at different frequencies to excite the battery and measure its impedance response at each frequency point. This periodic excitation approach allows systematic exploration of the battery's frequency-dependent impedance characteristics, providing comprehensive diagnostic information while maintaining efficient measurement through automated frequency sweeping.
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
Enables accurate, non-destructive diagnosis of battery electrode states, setting appropriate usage conditions to prevent further deterioration and potentially hazardous situations like explosions.
Implementation Method 1
a battery management apparatus according to an embodiment of the present invention includes a controller configured to determine an impedance of a battery by applying an alternating current signal to the battery and measuring a voltage and a current of the battery
Data Source
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AI summary
An apparatus for diagnosing a battery according to an embodiment of the present disclosure includes a profile obtaining unit configured to obtain a differential profile representing the corresponding relationship between a voltage of a battery and a differential capacity for the voltage; and a control unit configured to determine a target peak from the differential profile, determine a first comparison result that compares the voltage between a reference peak of a reference profile preset for the battery and the determined target peak and a second comparison result that compares the differential capacity between the reference peak and the determined target peak, and judge a state of the battery based on the first comparison result and the second comparison result.