Dual Voltage Divider Temperature Sensing Across Wide Battery Ranges
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Solution Overview
Problem
Existing temperature detection systems for secondary batteries suffer from measurement errors due to the use of voltage divider circuits, particularly when the resistance values of thermistors and pull-up resistors are not closely matched, leading to inaccuracies in temperature measurement across varying temperature ranges.
Innovation Solution
A temperature detection device utilizing two voltage divider circuits with thermistors and pull-up resistors, where the resistance values are selected to be close to each other in different temperature ranges, and a controller switches between these circuits based on temperature thresholds to improve accuracy, with optional weighting of outputs for seamless transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single voltage divider circuit is used for temperature detection, then the device complexity is low, but the measurement precision deteriorates across varying temperature ranges due to resistance value mismatches
Solution Approach 1:
The patent divides the temperature detection system into multiple voltage divider circuits, each optimized for specific temperature ranges. The controller selects the appropriate circuit based on the measured temperature, allowing each circuit to operate at optimal resistance matching conditions for its designated range, thereby improving overall measurement precision without requiring all circuits to be perfectly matched across all temperatures.
Solution Approach 2:
The system dynamically switches between different voltage divider circuits based on the detected temperature range. The controller monitors the temperature and selects the most appropriate circuit configuration, making the system adaptive to changing temperature conditions. This dynamic selection allows the system to maintain high measurement precision across varying temperatures while managing complexity through conditional operation rather than simultaneous operation of all circuits.
2Measurement precision
If resistance values of thermistors and pull-up resistors are not closely matched, then the ease of manufacture is improved, but the measurement precision deteriorates due to voltage division errors
Solution Approach 1:
The patent applies different resistance matching requirements to different voltage divider circuits based on their specific temperature ranges. Each circuit is designed with appropriate resistance values for its designated operating range, allowing local optimization of measurement precision without requiring uniform high-precision resistance matching across all circuits. This enables manufacturers to focus precision efforts where needed while maintaining ease of manufacture in other regions.
Solution Approach 2:
The system changes the resistance parameters of different voltage divider circuits to match the expected temperature characteristics. By selecting resistance values that are appropriate for each temperature range rather than requiring all resistors to be perfectly matched, the system achieves high measurement precision while maintaining manufacturing feasibility. The controller compensates for resistance variations by selecting the appropriate circuit configuration based on temperature conditions.
3Adaptability or versatility
If multiple voltage divider circuits are used with different resistance values, then the measurement precision is improved across temperature ranges, but the device complexity increases
Solution Approach 1:
The patent implements multiple voltage divider circuits that can be selectively activated based on temperature conditions. Each circuit is designed to function optimally within its specific temperature range, and the controller manages the selection between circuits. This multi-functional approach allows the system to cover a wide temperature range with high precision while managing complexity through controlled selection rather than simultaneous operation of all circuits.
Solution Approach 2:
The system dynamically switches between different voltage divider circuits based on the detected temperature range. The controller monitors temperature conditions and selects the most appropriate circuit, making the system adaptive to changing temperature conditions. This dynamic selection allows the system to maintain high measurement precision across varying temperatures while managing complexity through conditional operation rather than simultaneous operation of all circuits.
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 solution enhances temperature measurement accuracy across a wide range by reducing errors and enabling precise control of secondary battery operations, minimizing risks of overcharging, overdischarging, and sudden changes in output power.
Implementation Method 1
a first voltage divider circuit configured to apply a reference potential with respect to a base potential to a series circuit including a first temperature sensor disposed at a predetermined measurement point of a secondary battery and a first pull-up resistor connected in series to the first temperature sensor
Data Source
AI summary
A temperature detection device includes a first voltage divider circuit including a first temperature sensor and a first pull-up resistor connected in series to the first temperature sensor, a second voltage divider circuit including a second temperature sensor and a second voltage divider circuit including a second temperature sensor and a second pull-up resistor connected in series to the second temperature sensor, and a controller. The first pull-up resistor has a resistance value corresponding to that of the first temperature sensor that is at a first temperature. The second pull-up resistor has a resistance value corresponding to that of the second temperature sensor that is at a second temperature being lower than the first temperature. The controller selects outputs of the voltage divider circuits according to a temperature of a measurement point detected based on a voltage of the first temperature sensor.