Battery Pack Thermal Runaway Detection With Triggered Dual Sensing
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Solution Overview
Problem
Existing battery technologies face challenges in accurately detecting thermal runaway, leading to high error rates and short service life of temperature sensors.
Innovation Solution
A battery pack design that includes a cell module with internal first collection units for direct data collection, a data processing module for thermal runaway detection, and an external second collection module activated only when a thermal risk is detected, performing secondary detection to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature sensors are continuously activated for thermal runaway detection, then detection capability is improved, but service life of sensors deteriorates
Solution Approach 1:
The patent implements a two-stage detection mechanism where the first collection unit continuously monitors basic temperature data, and the second collection unit is activated periodically only when abnormal temperature changes are detected. This periodic activation of the second collection unit reduces continuous sensor operation while maintaining detection capability, thereby extending sensor service life without compromising thermal runaway detection reliability.
2Device complexity
If single-point temperature detection is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent divides the detection system into two independent collection units: the first collection unit disposed inside the battery cell for direct internal temperature monitoring, and the second collection unit disposed outside for external environment monitoring. This segmentation allows each unit to specialize in specific detection tasks, improving overall measurement precision while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The first collection unit acts as an intermediary between the battery cell interior and the external monitoring system. It collects internal temperature data and triggers the second collection unit only when abnormal conditions are detected, serving as a mediator that reduces the need for continuous external sensor activation while maintaining accurate thermal runaway detection capability.
3Measurement precision
If dual collection modules are always activated, then detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The system employs periodic activation of the second collection unit based on trigger conditions. The first collection unit continuously monitors temperature data, and only when predefined abnormal conditions are met does the system activate the second collection unit for enhanced external monitoring. This periodic operation mode significantly reduces energy consumption compared to continuous dual-module activation while maintaining high detection accuracy when needed.
Solution Approach 2:
The first collection unit performs preliminary monitoring of temperature conditions continuously at low energy cost. By detecting abnormal temperature changes in advance, it triggers the second collection unit only when necessary, performing the high-energy external detection as a preliminary action to confirmed abnormal conditions rather than continuously, thereby optimizing overall energy consumption.
Data Source
AI summary
A battery pack includes: a cell module, including at least one cell; a first collection module, including at least one first collection unit, the first collection unit being disposed within the cell, and being configured to collect first operational data of the cell; a data processing module, connected to the first collection unit, configured to perform thermal runaway detection on the cell based on the first operational data to obtain a first detection result; a second collection module, disposed outside the cell module, configured to be activated when the first detection result indicates that any one of the cell has a thermal runaway risk, and collect second operational data of the cell after activation; the data processing module is further connected to the second collection module, and further configured to perform secondary detection based on the second operational data to determine whether the cell has a thermal runaway risk.