Battery Cell SOH Monitoring for Electrode Tab Defect Detection
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Solution Overview
Problem
In large battery systems, diagnosing defective battery cells, particularly those with electrode tab defects, is challenging due to the difficulty in identifying specific cells among many and the various types of failures that can occur.
Innovation Solution
A battery system diagnosing apparatus and method that measures voltage or current for each battery cell, calculates the state of health (SOH) multiple times, and detects defects in electrode tabs by comparing SOH values with threshold values, allowing for early detection of disconnection and incomplete contact defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple battery cells are connected in series and/or parallel to increase output or capacity, then the power and energy storage capability are improved, but the difficulty of diagnosing specific defective cells increases
Solution Approach 1:
The patent divides the battery system into individual battery cells, each equipped with independent voltage measurement circuits and identification markers. This segmentation allows each cell to be monitored and diagnosed independently, resolving the difficulty of identifying specific defective cells in large-scale battery systems while maintaining high power and capacity through series/parallel connections.
2Measurement precision
If traditional diagnostic methods are used for battery systems, then the device complexity is kept low, but the measurement precision and early detection capability are insufficient
Solution Approach 1:
The patent extracts the diagnostic function from the overall battery system by implementing dedicated voltage measurement circuits, identification markers, and analysis units specifically for defect detection. This extraction enables precise measurement and early detection of electrode tab defects without significantly increasing overall system complexity, as the diagnostic components are integrated into the existing battery structure.
3Reliability
If electrode tab defects are not detected early, then the manufacturing process remains simple, but the reliability and safety of the battery system deteriorate
Solution Approach 1:
The patent implements preliminary diagnostic actions by continuously monitoring voltage changes and analyzing identification markers during battery operation. This preliminary detection of electrode tab defects enables early identification of potential failures before they compromise system reliability, while the manufacturing process remains relatively simple as it only requires integrating basic measurement circuits and markers during production.
Data Source
AI summary
Discussed is a battery system diagnosing apparatus including at least one sensor, and a processor configured to obtain data including at least one of voltage or current of a battery cell from the at least one sensor, calculate a state of health (SOH) for the battery cell multiple times over a period of time by using the voltage or current of the battery cell, and compare the SOH of the battery cell with a threshold value to determine whether a defect occurs in the battery cell.