BMS Sampling Element Short-Circuit Detection via Transistor Temperature
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Solution Overview
Problem
Existing battery management systems (BMS) fail to timely detect short-circuit faults in sampling elements, leading to incorrect current data and inadequate protection measures, necessitating hardware redundancy which increases development time and costs.
Innovation Solution
Employ a temperature sensor to monitor the temperature of a discharge transistor, calculating the temperature difference and discharge current to identify a short-circuit fault in the sampling element, and implement protective measures such as turning off transistors and entering a sleep mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hardware redundancy design is added to detect sampling element faults, then detection reliability is improved, but device complexity and production costs increase
Solution Approach 1:
The patent introduces a temperature sensor as an intermediary element to indirectly detect sampling element faults. Instead of adding redundant sampling elements, the temperature sensor monitors the discharge transistor's temperature, which changes in response to sampling element malfunctions. This intermediary approach enables fault detection without increasing sampling system complexity.
Solution Approach 2:
The patent replaces the mechanical/electrical redundancy approach (adding duplicate hardware sampling elements) with a thermal field-based detection method. By substituting the need for redundant electrical sampling components with temperature monitoring, the system achieves fault detection while reducing hardware complexity and production costs.
2Reliability
If hardware redundancy design is added to detect sampling element faults, then detection reliability is improved, but development time increases
Solution Approach 1:
The temperature sensor serves multiple functions: it monitors battery temperature for thermal management and simultaneously detects sampling element faults through temperature differential analysis. This multi-functionality eliminates the need for dedicated redundant sampling hardware, reducing both development time and system complexity while maintaining detection reliability.
Solution Approach 2:
By using the temperature sensor as an intermediary detection mechanism, the system avoids the time-consuming process of designing, testing, and integrating redundant sampling elements. The temperature-based indirect detection method can be implemented more quickly than hardware redundancy approaches.
3Measurement precision
If temperature monitoring is used to detect sampling element short-circuits, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The system uses the discharge transistor's own temperature characteristics to detect sampling element faults. The temperature sensor monitors the transistor's self-heating effect, which naturally varies with current flow. When a sampling element short-circuits, the current pattern changes, causing characteristic temperature variations that the system detects without additional active components.
Solution Approach 2:
The patent detects faults by monitoring changes in temperature parameters rather than directly measuring electrical parameters. By converting the electrical fault detection problem into a thermal parameter measurement problem, the system achieves high detection accuracy using standard temperature sensing technology without requiring complex specialized detection 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
Enables accurate identification of short-circuit faults in sampling elements using a single element, ensuring safe and stable operation of the BMS by preventing potential harm through real-time monitoring and protective actions.
Implementation Method 1
a temperature sensor is disposed in the battery management system to monitor a temperature of a discharge transistor
Data Source
AI summary
A short circuit identification method is provided for a sampling element of a battery management system. A temperature sensor is disposed in a battery management system to monitor a temperature of a discharge transistor, and the method includes: obtaining the temperature of the discharge transistor by using the temperature sensor, and calculating a temperature difference of the discharge transistor in a preset duration; comparing a discharge current obtained by using a sampling element with a preset current threshold; and determining that the sampling element is short-circuited. In embodiments of the present application, the temperature sensor is used to monitor the temperature change rate of the discharge transistor in the BMS system, it can be detected that only one sampling element has a short-circuit fault with reference to the discharge current obtained by the sampling element, and corresponding protection measures are taken, so that the BMS system runs safely and stably.