Battery Pack Overheating Diagnosis Using Ambient Temperature Reference
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Solution Overview
Problem
Existing technologies struggle to differentiate between battery overheating caused by internal temperature increases of battery cells or external environmental temperature increases, leading to misdiagnosis.
Innovation Solution
A battery pack equipped with cell temperature sensors, pack temperature sensors, and a battery management system (BMS) that distinguishes between internal and external temperature changes to diagnose overheating accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are installed around the battery cell and on the battery cell surface to detect ambient temperature, then the ability to detect temperature abnormality is improved, but the device complexity increases
Solution Approach 1:
The patent divides the temperature monitoring function into two separate sensor systems: cell temperature sensors for measuring battery cell temperature and ambient temperature sensors for measuring surrounding environment temperature. This segmentation allows independent measurement of internal and external temperature factors, enabling accurate differentiation between cell overheating and ambient temperature effects.
2Device complexity
If only absolute temperature of the battery cell is used for diagnosis, then the device complexity is reduced, but the measurement precision of overheating cause identification deteriorates
Solution Approach 1:
The patent introduces ambient temperature as an intermediary reference parameter to distinguish the cause of overheating. By comparing cell temperature with ambient temperature, the system can determine whether the temperature increase is due to cell internal issues or external environmental factors, thereby accurately identifying the overheating cause without requiring complex diagnostic equipment.
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 precise identification of overheating causes, preventing misdiagnosis and improving battery operation efficiency by distinguishing between internal and external temperature influences.
Implementation Method 1
one or more cell temperature sensors disposed adjacent to the one or more battery cells and configured to provide measured values for determining the increase in internal temperature of the battery pack; and one or more pack temperature sensors attached to an inner or outer surface of the pack case and configured to provide measured values for determining the increase in external temperature of the battery pack
Data Source
AI summary
A battery pack, in which an internal temperature and an external temperature of the battery pack are measured at a predetermined period from different temperature sensors installed in each of battery cells, a BMS, and a pack case of the battery pack and then be compared with a predetermined reference value to perform battery overheating diagnosis, in particular, determine whether causes of the overheating are due to internal or external factors of the battery pack, and a method for diagnosing the overheating.