Battery Short Differentiation Using Multi-Parameter Behavior Profiles
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Solution Overview
Problem
Short circuiting in lithium secondary batteries is a significant problem that can lead to battery under-performance, failure, and safety risks such as rupture, but the causes and mechanisms of shorting are not well understood.
Innovation Solution
A system and method for differentiating short circuiting in batteries, which includes a detector, a monitor with pre-defined profiles of battery shorting behaviors, and a controller that takes action based on the detected behavior. The system monitors temperature, heat generation, current flow, and voltage drop to discriminate between different types of short circuiting and dictate appropriate responses, ranging from aggressive to passive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single aggressive response is used for all short circuiting events, then safety is improved, but unnecessary aggressive responses are triggered for less dangerous shorts, causing loss of time and productivity
Solution Approach 1:
The system changes the response parameter based on the characteristics of the short circuit event. By monitoring multiple parameters (temperature, voltage, current) and comparing them against thresholds, the system determines whether to apply an aggressive response or a passive response, thereby avoiding unnecessary aggressive responses while maintaining safety for severe shorts
Solution Approach 2:
The system applies different response qualities to different short circuit scenarios. Instead of a uniform aggressive response, the system provides localized appropriate responses - aggressive for severe shorts requiring immediate intervention, and passive for less dangerous shorts that can be monitored without interruption
2Measurement precision
If multiple parameters are monitored to differentiate short types, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The monitoring system performs multiple functions using a unified approach. The same monitoring infrastructure tracks temperature, voltage, and current not only for short circuit detection but also for general battery management, making the complexity worthwhile by serving multiple purposes with a single system
Solution Approach 2:
The system segments the short circuit detection process into distinct evaluation stages. Each parameter (temperature, voltage, current) is evaluated separately against its own thresholds, and the combined results determine the response type. This modular segmentation makes the complex monitoring system more manageable and interpretable
Data Source
AI summary
A system for differentiating short circuiting in a battery includes: a detector coupled to the battery; a monitor in communication with the detector, the monitor including a profile of a battery shorting behavior, and a comparator for matching data from the detector to the profile; and a controller for taking action based upon information from the detector. A method for detecting short circuiting in a battery includes the steps of: detecting a behavior of the battery; comparing the behavior of the battery to a predetermined battery behavior profile; determining the type of short based on the comparison; and taking mitigating action based on the determination. The system/method may monitor temperature of the battery, heat generation from the battery, current flow through the battery, voltage drop across the battery, and/or combinations thereof. The system/method discriminates between the various battery shorting behaviors for aggressive response or passive response.