Dual-Path Battery Temperature Sensing for Failure Diagnosis
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Solution Overview
Problem
Existing battery management systems face challenges in accurately measuring battery temperatures and diagnosing parameter change failures, which can lead to incorrect temperature readings and compromised functional safety.
Innovation Solution
A temperature measuring apparatus that includes a first resistor, a second resistor, a temperature-variable resistive element, and a processor. The apparatus measures temperatures based on voltages divided across the resistors and the temperature-variable resistive element, allowing for the detection of parameter change failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single thermistor with pull-up resistor is used for temperature monitoring, then the device complexity is reduced, but the measurement precision and reliability deteriorate due to undetectable parameter change failures
Solution Approach 1:
The single temperature monitoring path is segmented into two separate measurement paths: a first path with a first pull-up resistor and first thermistor, and a second path with a second pull-up resistor and second thermistor. This segmentation allows independent monitoring of each component, enabling detection of parameter changes in individual resistors or thermistors by comparing measurements from both paths.
Solution Approach 2:
The invention monitors parameter changes by comparing temperature measurements from two different measurement paths. When the resistance of pull-up resistors or thermistors changes due to damage or aging, the temperature readings from the two paths will diverge. By detecting these parameter changes through comparison, the system can identify failures while maintaining the simplicity of using standard thermistor-based measurement circuits.
2Device complexity
If the pull-up resistor resistance changes due to external damage, then the temperature measurement becomes incorrect, but the device structure remains simple
Solution Approach 1:
The system implements feedback by continuously monitoring temperature through two independent paths and comparing the results. When parameter change failures occur in pull-up resistors or thermistors, the feedback mechanism detects the discrepancy between the two measurement paths and can trigger diagnostic alerts or corrective actions, thereby maintaining functional safety without complicating the overall system structure.
Solution Approach 2:
The invention performs preliminary diagnostic action by establishing two measurement paths that can detect potential failures before they cause critical safety issues. By having redundant measurement capabilities in place beforehand, the system can identify parameter changes in resistors or thermistors early and take preventive measures, improving reliability while keeping the added structural complexity minimal.
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 enables accurate temperature measurement and diagnosis of parameter change failures, thereby preventing functional safety issues caused by incorrect temperature readings.
Implementation Method 1
a temperature-variable resistive element connected to between the first node and the second node, and a resistance of the temperature-variable resistive element varies depending on a temperature of the temperature-variable resistive element
Data Source
AI summary
A temperature measuring apparatus for measuring a temperature of a battery pack is provided. A first resistor is connected between a first power supply and a first node, and a second resistor is connected between a second node and a second power supply. A temperature-variable resistive element whose resistance is varied depending on a temperature is connected to between the first node and the second node. A processor measures the temperature of the battery pack based on at least one of a first temperature measured based on a voltage of the first node and a second temperature measured based on a voltage of the second node.