Battery Pack Dew Point Control for Condensation Prevention
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Solution Overview
Problem
Secondary batteries are sensitive to internal environmental conditions, particularly humidity and temperature, which can lead to performance degradation, safety issues, and stability problems, especially in high-humidity environments.
Innovation Solution
An apparatus and method for controlling the internal environment of a battery pack using temperature and humidity sensors to calculate a dew point, set threshold values, and adjust heating and cooling through pulse width modulation (PWM) to maintain optimal conditions, preventing dew condensation and overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heating apparatus is used to increase internal temperature, then temperature control is improved, but energy consumption increases
Solution Approach 1:
The heating apparatus operates periodically based on PWM control signals with varying duty cycles, rather than continuously. The processor adjusts the duty cycle according to the difference between current temperature and threshold value, enabling periodic heating action that reduces overall energy consumption while maintaining effective temperature control.
Solution Approach 2:
The system implements feedback control by continuously monitoring internal temperature and humidity, calculating dew point, comparing current temperature with threshold value, and adjusting heating output accordingly. This closed-loop feedback mechanism ensures heating is applied only when necessary, optimizing energy efficiency.
2Temperature
If cooling apparatus is used to decrease internal temperature, then temperature control is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary action by calculating the dew point based on measured temperature and humidity before activating cooling. The processor determines whether cooling is needed by comparing current temperature with threshold value derived from dew point calculation, enabling proactive temperature management rather than reactive control.
Solution Approach 2:
The system changes operational parameters by using duty cycle modulation for both heating and cooling control. The processor sets duty cycle values based on temperature differences, enabling precise control of thermal apparatus output without requiring complex control hardware.
3Measurement precision
If dew point calculation and threshold setting are implemented, then humidity control precision is improved, but computational complexity increases
Solution Approach 1:
The processor performs preliminary calculation of dew point based on measured temperature and humidity values before making control decisions. By pre-calculating the dew point and setting threshold values in advance, the system enables precise humidity control without requiring complex real-time computations during operation.
Solution Approach 2:
The system replaces complex mechanical humidity control mechanisms with computational methods. The processor calculates dew point using temperature and humidity sensor data, determines threshold values, and controls thermal apparatus through PWM signals, substituting mechanical complexity with software-based control logic.
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
Precise control of the battery pack's internal environment enhances stability, prevents arc formation and welding issues, and extends the service life of the battery by maintaining optimal humidity and temperature levels.
Implementation Method 1
a temperature sensor which measures an internal temperature of the battery pack
Implementation Method 2
a humidity sensor which measures an internal humidity of the battery pack
Implementation Method 3
a heating apparatus which increases the internal temperature of the battery pack
Implementation Method 4
a cooling apparatus which decreases the internal temperature of the battery pack
Data Source
AI summary
An apparatus and method for controlling an internal environment of a battery pack, the apparatus including a temperature sensor which measures an internal temperature of a battery pack, a humidity sensor which measures an internal humidity of the battery pack, a heating apparatus which increases the internal temperature of the battery pack and a processor which controls an internal environment of the battery pack by calculating a dew point based on the measured internal temperature and internal humidity, setting a threshold value based on the dew point, determining whether a current temperature reaches the threshold value according to changes in the internal temperature and the internal humidity and applying a control signal to the heating apparatus so that the current temperature does not reach the threshold value.