Battery Pack Gas Duct for Module-Level Thermal Chain Detection
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Solution Overview
Problem
Existing battery pack configurations fail to detect thermal chains in individual battery modules accurately and timely, relying on increased internal pressure to trigger gas discharge and detection, which is delayed and inadequate.
Innovation Solution
A battery pack design with a gas duct and temperature sensor at the downstream end of the passage part, allowing early detection of thermal chains by monitoring gas temperature rises in each module, using a thermistor element and controller for timely notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas discharge valve is provided to detect thermal chain when gas is discharged, then thermal chain detection is enabled, but detection cannot be performed for each battery module individually
Solution Approach 1:
The invention divides the battery pack into multiple battery modules, each equipped with its own gas duct and temperature sensor. This segmentation enables independent monitoring of thermal chains in each module, transforming the detection system from a centralized approach to a distributed one, thereby achieving module-level detection precision.
Solution Approach 2:
The invention introduces a gas duct as an intermediary channel that guides gas from each battery module to a dedicated temperature sensor. This intermediary structure enables indirect temperature measurement of the gas generated during thermal chain reactions, allowing detection without direct contact with high-temperature cells while maintaining module-level monitoring capability.
2Measurement precision
If temperature sensor is placed directly in high-temperature gas path, then thermal chain detection accuracy is improved, but sensor exposure to high temperature reduces reliability
Solution Approach 1:
The gas duct serves as a thermal intermediary, allowing the temperature sensor to measure gas temperature indirectly without being exposed to the extreme heat sources. The duct material and design provide thermal isolation while maintaining the ability to detect temperature changes caused by thermal chain reactions, thus protecting the sensor while preserving detection accuracy.
Solution Approach 2:
The invention extracts the temperature sensor from the direct high-temperature environment of the battery cells and places it in a protected position within the gas duct. This extraction removes the sensor from harmful thermal exposure while maintaining its ability to detect the thermal signature of gas flow, thereby extending sensor life without compromising detection capability.
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
Enables early and accurate detection of thermal chains in each battery module, reducing costs by minimizing direct exposure of the temperature sensor to high-temperature gases and integrating it with existing voltage sensor infrastructure.
Implementation Method 1
a temperature sensor disposed at a downstream end of the passage part and configured to detect a temperature of gas flowing in the discharge part
Data Source
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AI summary
The battery pack including: a housing; a battery module accommodated in the housing and implemented by stacking a plurality of cells; a gas duct including a passage part disposed to cover an upper surface of the battery module, extending in a stacking direction, and configured to guide a gas in the stacking direction when the gas is generated from the cells, and a discharge part connected downstream of the passage part and configured to guide the gas to outside; and a temperature sensor disposed at the downstream end of the passage part and configured to detect a temperature of the gas flowing in the discharge part.