Handheld Terminal Battery Temperature Control for Cold Environments
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Handheld terminals used in cold environments face battery voltage drops due to increased internal resistance, leading to shutdowns, as conventional temperature monitoring only considers battery temperature, neglecting the temperature difference between the terminal body and battery, which can result in operational issues during job tasks.
Innovation Solution
The handheld terminal employs a battery temperature sensor to monitor and adjust settings for both the display and flashing unit based on elapsed time and battery temperature, using dual thresholds of 10°C and -10°C to ensure optimal operation by switching between normal and low temperature settings, thereby mitigating the impact of temperature differences between the battery and terminal body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only battery temperature is monitored using a thermistor, then the configuration becomes simple and temperature detection is suitable, but the temperature difference between the terminal body and battery is not detected, leading to operational issues in cold environments
Solution Approach 1:
The temperature monitoring function is segmented into two independent sensors: one in the battery and one in the terminal body. This allows each sensor to independently monitor its local temperature, enabling the system to detect temperature differences between components while maintaining simple individual sensor configurations.
Solution Approach 2:
The control unit acts as an intermediary that receives temperature information from both the battery thermistor and the terminal body temperature sensor. It processes this information to determine the temperature difference and accordingly adjusts the operating frequency of the processor and other parameters, resolving the contradiction by mediating between the simple sensor configuration and reliable operation control.
2Speed
If the processor operating frequency is not adjusted in low temperature environments, then the device maintains normal processing speed, but battery voltage drops due to increased internal resistance, causing shutdowns
Solution Approach 1:
The processor operating frequency is made dynamic rather than fixed. The control unit continuously monitors the temperature difference between the battery and terminal body, and adjusts the processor frequency accordingly - reducing it when the terminal body is colder than the battery to save power, and maintaining normal speed when temperatures are balanced.
Solution Approach 2:
The system changes operating parameters (processor frequency, display refresh rate, communication protocols) based on the detected temperature difference. When the terminal body temperature is significantly lower than battery temperature, the system reduces processing frequency and adjusts other parameters to match the actual operating conditions, preventing power supply instability.
3Duration of action of stationary object
If the battery is exchanged during cold environment operation, then power supply continuity is maintained, but the temperature difference between the new battery and terminal body causes operational issues
Solution Approach 1:
The system performs preliminary temperature monitoring immediately after battery exchange. The control unit detects the temperature difference between the newly attached battery and the terminal body before full operation begins, and proactively adjusts operating parameters to prevent operational issues, rather than waiting for problems to occur.
Solution Approach 2:
The system implements continuous feedback monitoring of the temperature difference between battery and terminal body. After battery exchange, the control unit regularly checks the temperature differential and dynamically adjusts processing frequency and other parameters based on real-time conditions, ensuring stable operation despite temperature differences from the newly installed battery.
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 approach ensures reliable operation by adjusting clock frequencies and flash settings, preventing display issues and power consumption increases, even when the battery and terminal body have different temperatures, thus extending power supply duration and maintaining performance in low-temperature conditions.
Implementation Method 1
the battery used in the handheld terminal includes a thermistor which detects the battery temperature of the battery
Data Source
Figure 1A~1C
Figure 2
Figure 3
AI summary
An information terminal (10) in which a battery device (30) is attached to a terminal main body (10A) detachably and which includes a predetermined device (14, 19) separate from the battery device (30) in the terminal main body (10A), the information terminal including: a temperature measuring unit (11) which obtains temperature information output from a temperature sensor (301) provided in the battery device (30) and which measures a temperature of the battery device (30), characterized by, a controller (11) which sets the predetermined device (14, 19) based on an amount of time that elapsed from when the information terminal (10) starts or when a hot swap mode in which the battery device (30) can be exchanged ends and the measured temperature of the battery device (30).