Battery Fan Control Using Ambient and Cell Temperature Feedback
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Solution Overview
Problem
Conventional temperature management systems for hybrid electric vehicle batteries fail to effectively manage temperature variations between the battery and ambient conditions, leading to performance degradation and inefficient cooling/heating, as they rely solely on battery temperature sensors without considering ambient temperature.
Innovation Solution
A temperature management apparatus that includes air channels, air feeders with fans, and a control device with temperature detectors for both the battery and ambient air, allowing for dynamic adjustment of fan speed based on both battery and ambient temperature thresholds to optimize cooling and heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fan is driven based solely on battery temperature without considering ambient temperature, then the battery cooling control is simplified, but the battery performance deteriorates when ambient temperature is higher than battery temperature
Solution Approach 1:
The control device incorporates ambient temperature detection and uses feedback from both battery temperature and ambient temperature sensors to dynamically adjust fan operation. The control device compares battery temperature with ambient temperature and only drives the fan when battery temperature is higher than ambient temperature, creating a closed-loop feedback system that prevents performance degradation.
Solution Approach 2:
The system changes the control parameter from single-parameter (battery temperature only) control to multi-parameter (battery temperature and ambient temperature) control. By monitoring both temperatures and comparing them, the system adapts fan operation based on the temperature differential, ensuring optimal battery performance under varying ambient conditions.
2Temperature
If the fan is driven when battery temperature is low, then cooling is provided, but battery performance deteriorates due to unnecessary cooling when ambient temperature is high
Solution Approach 1:
The control device uses feedback from both temperature sensors to determine when fan operation is necessary. By continuously monitoring both battery temperature and ambient temperature and comparing them, the system provides cooling only when the battery temperature exceeds ambient temperature, eliminating unnecessary energy consumption from inappropriate fan operation.
Solution Approach 2:
The system applies partial cooling action only when necessary (when battery temperature > ambient temperature) rather than continuous cooling. This conditional approach prevents excessive cooling action that would waste energy, while still providing adequate cooling when the battery requires it.
3Device complexity
If ambient temperature is not monitored, then the control device is simpler, but temperature management effectiveness is reduced
Solution Approach 1:
The control device incorporates feedback from both battery temperature sensors and ambient temperature sensors. By monitoring both temperature sources and using this feedback to control fan operation, the system achieves effective temperature management that adapts to changing ambient conditions, improving reliability without excessive complexity.
Solution Approach 2:
The control device performs multiple functions: it monitors battery temperature, monitors ambient temperature, compares the two temperatures, and controls fan operation based on the comparison. This multi-functional approach enables comprehensive temperature management using a single integrated control system.
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 solution minimizes temperature-related performance degradation by ensuring the battery operates within optimal temperature ranges, reducing ambient influences and maintaining uniform cell temperatures, thereby enhancing battery performance and longevity.
Implementation Method 1
The cooling device feeds air to the interior of the battery pack 110, thereby cooling the battery pack 110 with the air... When the fan 104 is driven by the motor 105, air inside the vehicle is fed into the battery case 112 through the air intake duct 101
Implementation Method 2
electrochemical reactions at the time of charging or discharging in the secondary battery rely on temperature... The secondary battery is charged or discharged corresponding to the running state of the vehicle
Data Source
AI summary
A temperature management apparatus for managing the temperature of cells 11, which includes an air intake duct 1, a fan unit 3, a first temperature detector (temperature sensors 25, a temperature detecting part 23) for detecting temperature Tb of the cells 11, a second temperature detector (a temperature sensor 26, a temperature detecting part 23) for detecting ambient temperature Ta, and a control device 20. The fan unit 3 has a fan 4 and a motor 5. The control device 20 has a storage part 22 and a deciding part 21. The storage part 22 stores a cooling-necessitating temperature Tc and a heating-necessitating temperature Th. The deciding part 21 directs the fan unit 3 to drive the fan 4 in a case where the temperature Tb of the cells becomes equal to or higher than both the temperature Ta of the air and the cooling-necessitating temperature Tc, or in a case where the temperature Tb of the cells becomes equal to or lower than both the temperature Ta of the air and the heating-necessitating temperature Th.