Secondary Battery Abnormality Detection via Voltage Lag Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for detecting abnormalities in secondary battery systems, such as sodium-sulfur batteries, face challenges in identifying the source of internal or external short circuits promptly, leading to delayed responses and potential damage spread.
Innovation Solution
An apparatus and method that utilize voltage and current measurements with a first-order lag analysis to detect voltage and current threshold deviations, allowing for early identification of abnormal modules or blocks within the battery system, thereby enabling timely action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If discharge depth comparison method is used to detect abnormality, then apparatus complexity is reduced and production cost decreases, but abnormality detection speed and precision deteriorate
Solution Approach 1:
The patent segments the battery system into multiple blocks, each with dedicated voltage measurement and abnormality detection capabilities. By dividing the detection function across segments (blocks) rather than using a centralized complex system, the patent achieves precise localization of abnormalities while keeping individual detection units relatively simple.
Solution Approach 2:
The patent implements preliminary voltage measurement and comparison actions by continuously monitoring block voltages and comparing them against threshold values before actual abnormality occurs. This preliminary detection mechanism enables early identification of potential issues, improving detection speed without requiring complex real-time analysis systems.
2Device complexity
If block-level abnormality detection is implemented, then apparatus complexity and production cost are reduced, but response time to locate specific abnormal cells deteriorates
Solution Approach 1:
The patent applies local quality by implementing voltage threshold comparison specifically at the block level where abnormalities are most likely to manifest. This localized detection approach focuses computational and measurement resources on critical areas, enabling rapid identification of problematic blocks without requiring complex system-wide analysis.
Solution Approach 2:
The patent uses partial action by implementing voltage threshold comparison only for blocks showing abnormal voltage deviations, rather than continuously analyzing all battery cells. This selective monitoring approach reduces overall system complexity while maintaining fast response time for detecting actual abnormalities.
3Measurement precision
If voltage threshold comparison with first order lag is used, then abnormality detection accuracy improves, but measurement and processing complexity increases
Solution Approach 1:
The patent implements feedback by using first-order lag filtering on voltage measurements, where the filtered voltage becomes a reference for comparison. This feedback mechanism smooths out noise and transient fluctuations, improving detection accuracy while using a simple recursive calculation that doesn't significantly increase processing complexity.
Solution Approach 2:
The patent changes the parameter being measured from raw voltage to filtered voltage (with first order lag). This parameter transformation improves signal quality and abnormality detection accuracy by eliminating high-frequency noise, while the filtering operation itself remains computationally simple.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to a device and a method for specifying where an abnormality has occurred in a secondary battery system and a program. The device has: a voltage measuring unit (62) for detecting the voltage of a secondary battery at least on a per block basis and outputting the result as a block voltage (V); an information acquiring unit (54) for acquiring the information of a module among a plurality of modules (22), said module housing a block (26) in which the difference (ΔV) between the block voltage (V) and a block voltage (Vr) that is the first order lag of the block voltage (V) has changed exceeding a preset voltage threshold value (Vth); a notification receiving unit (56) for receiving the notification of the occurrence of an abnormality in the secondary battery; and a module specifying unit (58) for, when the notification receiving unit (56) receives the notification, specifying the module (22) corresponding to the module information as a module (22) in which an abnormality has occurred.