Battery Module Temperature Sensing With Isolated Heat-Conducting Pad
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Solution Overview
Problem
Current temperature monitoring methods for battery cells using an aluminum bar and temperature sensor are inaccurate due to temperature discrepancies between the aluminum bar and the battery cells, especially at high discharge rates, and there is a risk of short circuits from the sensor's weld leg proximity to the conductive sheet.
Innovation Solution
A temperature monitoring apparatus with an isolation plate, aluminum bar, flexible printed circuit board, and temperature measurement assembly, utilizing a heat conducting pad to directly measure the battery cell temperature, separated from the conductive sheet to avoid short circuits and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the temperature sensor is welded at the junction of the conductive sheet and FPC, then the temperature can be monitored, but the fillet weld leg is very close to the conductive sheet causing risk of short circuit
Solution Approach 1:
The patent divides the temperature monitoring system into separate functional components: the heat conducting pad is separated from the conductive sheet, and the temperature sensor is positioned on the FPC away from the conductive sheet junction. This segmentation eliminates the short circuit risk while maintaining temperature monitoring capability through the isolated heat conduction path.
2Measurement precision
If the temperature sensor monitors the aluminum bar temperature, then the module temperature can be determined, but the aluminum bar temperature change is significantly larger than battery cell temperature change at large discharge rate
Solution Approach 1:
The patent introduces a heat conducting pad as an intermediary between the battery cell and the temperature sensor. This pad directly contacts the battery cell surface and conducts heat to the temperature sensor, providing an accurate temperature reflection of the battery cell without the thermal distortion introduced by the aluminum bar connection structure.
3Measurement precision
If the heat conducting pad is attached directly to the battery cell, then the heat transfer path is shortened and temperature measurement accuracy is improved, but the structure complexity increases
Solution Approach 1:
The patent merges the heat conducting pad with existing structural components of the battery module, integrating temperature monitoring functionality into the current design framework. This approach shortens the heat transfer path and improves measurement accuracy while avoiding significant increases in overall structural complexity.
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
The apparatus provides accurate temperature measurement by shortening the heat transfer path and avoiding short circuits, ensuring the measured temperature closely reflects the actual battery cell temperature, with flexible positioning and simplified manufacturing processes.
Implementation Method 1
a heat conducting pad of the temperature measurement assembly extends out the second mounting frame... The temperature of the device to be monitored is conducted through the heat conducting pad
Data Source
AI summary
A temperature monitoring apparatus and a battery module having the temperature monitoring apparatus. The temperature monitoring apparatus comprises an isolation plate, a connecting aluminum bar, a flexible printed circuit board, and a temperature measuring assembly. A first mounting frame and a second mounting frame are provided on the isolation plate. The connecting aluminum bar is embedded in the first mounting frame. The flexible printed circuit board is laid on the surface of the isolation plate in a manner of partially overlapping with the second mounting frame. The temperature measuring assembly is provided on the part of the flexible printed circuit board where the flexible circuit board overlaps the second mounting frame.