Lithium-Ion Battery Anomaly Detection via SOC Pulse Response
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for detecting abnormality in lithium-ion batteries are inefficient, subjective, and pose safety hazards due to reliance on empirical judgment and physical disassembly, which can lead to errors and safety risks.
Innovation Solution
A method and device that detect abnormality in lithium-ion batteries through non-destructive means by changing the charge current during the charging process and analyzing voltage signals over various SOC values to determine abnormality based on voltage variation and resistance values, eliminating the need for physical disassembly and subjective judgment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the battery is disassembled for visual inspection to determine abnormality, then the detection method is simple and direct, but the operation becomes complicated, labor-intensive, and poses safety hazards
Solution Approach 1:
The patent replaces the mechanical disassembly operation with an electrical measurement system. By applying a current pulse and measuring voltage response, the system detects battery abnormality without physical disassembly, thereby eliminating labor-intensive operations and safety hazards while maintaining detection capability
Solution Approach 2:
The patent introduces an intermediate measurement process (voltage response measurement under current pulse) between the battery and the detection conclusion. This intermediary electrical measurement serves as a proxy for direct visual inspection, enabling indirect but safe and automated detection of battery abnormality
2Reliability
If the battery is disassembled for inspection, then direct observation of abnormality is possible, but safety hazards and resource consumption increase
Solution Approach 1:
The patent substitutes mechanical disassembly with electrical measurement, eliminating the safety hazards associated with handling and disassembling batteries. The electrical measurement process is inherently safer as it does not require physical contact or exposure to battery internals
Solution Approach 2:
The battery itself provides the detection information through its electrical response characteristics. By measuring the voltage response to a current pulse, the battery's own electrical properties reveal its health status, eliminating the need for external intervention through disassembly
3Productivity
If visual inspection method is used to determine abnormality, then the detection process is straightforward, but the method involves subjective judgment errors and low efficiency
Solution Approach 1:
The patent implements an automated feedback-based detection system. The measured voltage response is compared against reference values or thresholds, and the system automatically determines abnormality status. This eliminates subjective human judgment and provides consistent, objective, and efficient detection
Solution Approach 2:
The patent replaces human visual inspection with an automated electrical measurement and analysis system. This substitution eliminates subjective judgment errors inherent in human inspection while significantly improving detection efficiency through automation
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
This approach allows for real-time, accurate detection of abnormality in lithium-ion batteries without disassembly, reducing errors and safety hazards, and enabling timely countermeasures to prevent accidents such as short circuits and thermal runaway.
Implementation Method 1
calculating a resistance value (ZTR) through ohm law (dU/dI)
Data Source
Figure 1~2
Figure 3a~3b
Figure 4~5
AI summary
Embodiments of this application provide a method and a device for detecting abnormality of a lithium battery, a battery management system, and a battery system. The method includes: obtaining a SOC value of the lithium battery in a charge process, where the SOC value is a ratio of a remaining capacity of the battery to a nominal capacity of the battery; changing a value of a charge current at a time point corresponding to an arbitrary SOC value, and obtaining a response signal within a time period of maintaining the changed charge current; and determining, based on response signals at time points corresponding to a plurality of SOC values, whether the lithium battery is abnormal. The method can implement non-destructive detection of abnormality of a lithium-ion battery, simplify operation, and achieve relatively high accuracy.