Segmented Temperature Detection Circuit for Lithium Battery Protection
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Solution Overview
Problem
Traditional lithium battery temperature detection circuits face challenges with unstable accuracy, cumbersome trimming processes, and complex circuit structures due to excessive variables and the need for multiple reference voltages across varying temperature ranges.
Innovation Solution
The proposed temperature detection circuit employs an enable signal generation module to segmentally generate detection enable signals for ultra-low, low, high, and ultra-high temperature detection, and a detection output module to generate corresponding thresholds and control signals, thereby simplifying the circuit structure and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple reference voltages and comparators are used to detect different temperature ranges, then temperature detection coverage is improved, but circuit complexity increases
Solution Approach 1:
The temperature detection range is segmented into multiple intervals, with each interval having a dedicated comparator and reference voltage. The enable signal generation module segments the detection process by generating enable signals for different temperature ranges, allowing the circuit to handle multiple temperature intervals through modular comparators rather than a single complex comparison system.
2Measurement precision
If multiple trimming variables are used to adjust temperature detection, then detection accuracy is improved, but trimming process complexity increases
Solution Approach 1:
The trimming function is extracted and integrated into the enable signal generation module. Instead of having separate trimming circuits for each comparator, the enable signal generation module centrally manages the trimming of reference voltages and generation of enable signals, reducing the number of independent trimming variables and simplifying the overall trimming process.
3Adaptability or versatility
If reference voltages are increased to handle ultra-low temperature detection, then detection range is improved, but voltage generation difficulty increases
Solution Approach 1:
The reference voltage system is made dynamic through the enable signal generation module, which generates enable signals for different temperature ranges. This allows the circuit to activate only the necessary reference voltages and comparators for the current temperature range, avoiding the need to continuously maintain excessively high reference voltages across all temperature conditions and simplifying voltage generation requirements.
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 design effectively manages charging and discharging paths based on temperature, enhancing the protection of lithium batteries from temperature-related damage, while ensuring high precision and reliability without the need for reference voltages or complex trimming processes.
Implementation Method 1
A thermistor's resistance decreases as the temperature rises
Data Source
AI summary
A temperature detection circuit is provided. The temperature detection circuit includes an enable signal generation module and a detection output module. The enable signal generation module is configured to segmentally generate four detection enable signals. The detection output module is connected to an output terminal of the enable signal generation module, and is configured to segmentally generate four thresholds based on the four detection enable signals, and sequentially compare the four thresholds with a detection value. A charging-prohibited signal is valid when a low temperature protection or a high temperature protection is triggered, and a charging-prohibited/discharging-prohibited signal is valid when an ultra-low temperature protection or an ultra-high temperature protection is triggered. The temperature detection circuit of the present disclosure addresses several issues associated with existing lithium battery temperature protection chips, including difficulties in controlling temperature detection results, unstable accuracy, and a cumbersome trimming process due to excessive variables.