Battery Overvoltage Detection With Dual Reference Thresholds
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Solution Overview
Problem
Conventional battery management systems face erroneous overvoltage detection due to failures in overvoltage detection units or peripheral circuits, leading to inadequate battery control and potential safety issues.
Innovation Solution
Incorporating two overvoltage detection units with different reference voltages, where the first unit generates a detection signal if the battery voltage exceeds its reference voltage and the second unit does if it exceeds its higher reference voltage, allowing the MCU to diagnose normal operation or errors based on the generated signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If one overvoltage detection unit is provided in the battery management system, then the device complexity is reduced and manufacturing cost is lowered, but measurement precision deteriorates due to potential failures of the single detection unit or its peripheral circuit
Solution Approach 1:
The single overvoltage detection unit is segmented into two independent detection units with different reference voltages. The first detection unit uses a first reference voltage (e.g., 4.35V) and the second detection unit uses a second reference voltage (e.g., 4.45V). This segmentation allows the system to detect overvoltage conditions at different thresholds and cross-validate measurements, thereby improving detection accuracy while maintaining manageable system complexity through modular design.
2Reliability
If one overvoltage detection unit is used, then the device complexity is minimized, but reliability deteriorates due to potential failures of the detection unit or peripheral circuit leading to erroneous diagnosis
Solution Approach 1:
The system implements a feedback mechanism where the MCU receives detection signals from both detection units and compares them against expected reference voltages. When the first detection unit signals overvoltage at 4.35V but the second unit does not signal at 4.45V, the MCU receives feedback indicating a potential measurement error. This feedback loop enables the system to identify and flag unreliable measurements, thereby improving overall detection reliability through continuous validation.
Solution Approach 2:
The system performs preliminary validation by comparing measurements from two detection units with different reference voltages before finalizing the overvoltage diagnosis. The second detection unit acts as a preliminary check - if it does not detect overvoltage when the first unit does, the system preliminarily identifies this as a potential error condition. This preliminary action prevents erroneous diagnoses before they affect battery control decisions.
3Measurement precision
If conventional single detection unit is applied, then ease of operation is maintained, but measurement precision worsens due to inability to detect measurement errors
Solution Approach 1:
The dual detection unit system performs self-validation by comparing its own measurements against each other. The first detection unit measures voltage relative to its reference voltage, and the second detection unit measures voltage relative to its different reference voltage. The system automatically detects inconsistencies between these two measurements and identifies potential errors without requiring external calibration or manual verification. This self-service capability improves measurement precision while maintaining ease of operation, as the system autonomously handles the complexity of cross-validation.
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 effectively prevents erroneous overvoltage detection by enabling the MCU to accurately diagnose measurement errors and abnormalities in the overvoltage detection units and peripheral circuits, ensuring proper battery control and safety.
Implementation Method 1
a first overvoltage detection unit that generates a first detection signal by comparing a battery voltage of the battery with a first reference voltage
Implementation Method 2
a second overvoltage detection unit that generates a second detection signal by comparing the battery voltage with a second reference voltage different from the first reference voltage
Data Source
AI summary
A battery management system includes a battery monitoring integrated circuit (BMIC) that diagnoses a state of a battery, a first overvoltage detection unit that generates a first detection signal by comparing a battery voltage of the battery with a first reference voltage, a second overvoltage detection unit that generates a second detection signal by comparing the battery voltage with a second reference voltage different from the first reference voltage, and a micro controller unit (MCU) that controls the battery according to a diagnosis signal from the BMIC and diagnoses an abnormality of an apparatus according to the first and second detection signals, and a battery management method.