Battery Hazard Level Detection via Voltage and Temperature Monitoring
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Solution Overview
Problem
Conventional methods for detecting internal short circuits in batteries are inadequate, as they fail to accurately quantify the released energy and verify hazard levels, often resulting in binary 'safe' or 'dangerous' conditions, and do not account for continuous accumulation of minor short circuits, which can lead to thermal runaway.
Innovation Solution
A battery safety identifying method that detects voltage drops, voltage drop rates, voltage recovery ratios, and surface temperatures to set hazard levels, activating protection mechanisms based on these parameters, and includes a warning system using a battery management system and alarm system to display light signals or emit alarms according to the hazard levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional penetration experiment is used to detect internal short circuit, then detection method is simple, but measurement precision of hazard level is insufficient
Solution Approach 1:
The patent segments the binary hazard assessment into multiple graded levels (first hazard level, second hazard level, third hazard level) based on different combinations of voltage drop, voltage recovery ratio, and temperature rise parameters. This segmentation enables precise measurement of hazard levels by evaluating multiple parameter combinations rather than using a single binary assessment.
Solution Approach 2:
The patent adds multiple measurement dimensions (voltage drop, voltage recovery ratio, temperature rise) to transform the single-dimension binary assessment into a multi-dimensional graded assessment system. This dimensional expansion allows for more accurate hazard level measurement by considering multiple parameter interactions.
2Loss of information
If conventional binary assessment is used, then device complexity is low, but loss of information about continuous short circuit accumulation occurs
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring voltage recovery ratio and temperature rise after penetration, and using this feedback information to dynamically adjust hazard level assessment. The system provides feedback on the battery's response to penetration damage, enabling detection of continuous short circuit accumulation that binary assessment would miss.
Solution Approach 2:
The patent performs preliminary controlled penetration experiments to establish baseline hazard levels and parameter thresholds before actual battery operation. This preliminary action creates a reference framework that enables continuous monitoring and accumulation detection during normal battery use without requiring complex real-time analysis of every parameter fluctuation.
3Difficulty of detecting and measuring
If severe penetration experiment is performed, then detection capability is improved, but object-generated harmful factors increase
Solution Approach 1:
The patent applies partial penetration rather than complete through-penetration, using controlled penetration depth that is sufficient to detect internal short circuits but insufficient to cause severe battery damage or massive energy release. This partial action maintains detection capability while reducing harmful effects.
Solution Approach 2:
The patent implements protective measures beforehand by using controlled penetration parameters and having protection mechanisms ready to activate based on monitored parameters. The system cushions against severe damage by limiting penetration energy and preparing protective responses in advance based on real-time parameter monitoring.
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 method improves the accuracy of hazard level determination, enabling graded classification of battery abnormalities and activating appropriate protection mechanisms to prevent thermal runaway and ensure user safety.
Implementation Method 1
A voltage drop and a voltage drop rate are detected when a battery is abnormal
Implementation Method 2
A surface temperature or a temperature rise is detected when the battery is abnormal
Data Source
AI summary
A battery safety identifying method is provided. The method includes the following steps. A voltage drop and a voltage drop rate are detected when a battery is abnormal. A duration time of the voltage drop and a voltage recovery ratio are detected when the battery is abnormal. A surface temperature or a temperature rise rate is detected when the battery is abnormal. A plurality of hazard levels of battery abnormality and at least one protection mechanism are set according to the voltage drop, the voltage drop rate, the voltage recovery ratio and the surface temperature or the temperature rise rate.