Battery Sensing Circuit Leakage Detection via Series Resistors
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Solution Overview
Problem
Conventional battery sensing circuits experience electrical leakages, leading to damage and thermal events due to resistive shorts, which result in measurement errors and potential system failures.
Innovation Solution
Incorporating a resistor in series with the sense line of the battery sensing circuit to detect leakage current by measuring voltage drops, and implementing protective actions such as fuse triggering, balancing switch actuation, and notification signals when voltage differences between battery cells exceed a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a battery sensing circuit is used to monitor battery system, then battery state measurement is enabled, but electrical leakage causes measurement errors and potential damage
Solution Approach 1:
The patent implements preliminary protective actions by placing resistors in series with sense lines and configuring the control system to detect voltage drops before leakage currents cause damage. The system proactively monitors for leakage conditions and triggers protective measures (fuse activation, contactor opening) before the sensing circuit is damaged, thereby maintaining both measurement precision and reliability.
Solution Approach 2:
The patent introduces intermediary protective components (resistors, fuses, contactors) between the battery cells and the sensing circuit. These intermediaries detect and isolate leakage currents before they can corrupt voltage measurements or damage the sensing circuit, thus preserving both measurement accuracy and system reliability.
2Reliability
If electrical leakage is detected in the battery sensing circuit, then protective actions can be implemented, but the leakage current causes thermal events and circuit damage
Solution Approach 1:
The patent applies beforehand cushioning by placing resistors in series with sense lines to limit leakage currents before they can cause thermal events. The resistors act as current limiters that cushion the impact of leakage currents, while fuses and contactors provide additional protective layers that activate before damage occurs.
Solution Approach 2:
The patent converts the harmful leakage current into a detectable signal by measuring voltage drops across series resistors. The leakage current, which would normally cause damage, is transformed into useful diagnostic information that triggers protective actions, thereby turning a harmful factor into a beneficial detection mechanism.
3Difficulty of detecting and measuring
If resistors are added in series with sense lines to detect leakage current, then leakage detection capability is improved, but circuit complexity increases
Solution Approach 1:
The series resistors serve multiple functions: they limit leakage currents, enable leakage detection through voltage drop measurement, and provide current division for safe measurement. This multi-functionality reduces the need for separate protective components, thereby limiting the increase in circuit complexity while improving detection capability.
Solution Approach 2:
The sensing circuit uses its own existing voltage measurement capability to detect leakage currents by measuring voltage drops across the series resistors. No additional current measurement hardware is needed; the system serves itself by repurposing its voltage sensing function for leakage detection.
4Measurement precision
If voltage measurements are performed on battery cells, then battery state monitoring is enabled, but resistive shorts cause measurement errors
Solution Approach 1:
The patent extracts the leakage current path from the voltage measurement path by placing resistors in series with sense lines. This separation allows the measurement system to detect leakage through voltage drops without the leakage current directly interfering with voltage measurements, thereby eliminating measurement errors caused by resistive shorts.
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
Effectively detects and mitigates electrical leakages, preventing damage and thermal events by implementing protective measures, ensuring accurate battery measurements and system protection.
Implementation Method 1
The resistor may exhibit a measurable voltage drop when there is leakage current flowing through the sense line and the battery sensing circuit. By measuring the voltage drop, an undesirable leakage current may be detected
Data Source
AI summary
System and methods for detecting electrical leakages in a battery sensing are presented. In certain embodiments, the systems and methods allow a vehicle battery sensing circuit and/or other associated system to detect certain electrical leakages and implement one or more actions to protect vehicle systems from damage resulting from such leakages.