Capacitor Module Safety Device for High-Power Traction
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Solution Overview
Problem
High-capacity capacitor modules used in applications like electric traction face reliability issues due to potential unsafe operating states such as excessive voltage, current, temperature, and pressure, which can lead to damage, fire, or injury if not monitored and managed effectively.
Innovation Solution
A safety device connected to the capacitor module continuously monitors operating states and switches to a safety mode by limiting current, discharging capacitors, and employing sensors to detect anomalies like temperature, pressure, and electrolyte leaks, with features like current limiting, strain gauges, and safety valves to prevent damage and ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If capacitor modules are used for short-term provision of high power, then power capability is improved, but reliability deteriorates due to potential unsafe operating states
Solution Approach 1:
The safety device performs preliminary monitoring of operating parameters (temperature, pressure, voltage, current) and takes preventive action by switching to safety mode before unsafe conditions develop. This allows the capacitor module to operate at high power while maintaining reliability through advance detection and response to potential failures.
Solution Approach 2:
The safety device continuously monitors operating parameters and provides feedback control by comparing measured values against threshold values. When parameters exceed safe limits, the system automatically transitions to safety mode, creating a closed-loop control system that maintains reliability while enabling high power operation.
2Power
If multiple capacitors are connected together to meet performance and voltage requirements, then power capability is improved, but device complexity increases
Solution Approach 1:
The safety device serves multiple functions simultaneously: it monitors temperature, pressure, voltage, and current; compares all parameters against threshold values; controls the transition to safety mode; and manages the discharge process. This multi-functional approach reduces overall system complexity despite the presence of multiple capacitors.
Solution Approach 2:
The patent combines multiple monitoring and control functions into a single integrated safety device that manages the entire capacitor module system. By merging temperature sensing, pressure sensing, voltage monitoring, current monitoring, and control logic into one device, the system achieves high power capability through multiple capacitors without proportionally increasing complexity.
3Object-affected harmful factors
If the capacitor module is closed in a gas-tight manner, then protection against external contaminants is improved, but reliability deteriorates due to internal pressure buildup and electrolyte boiling
Solution Approach 1:
The safety device acts as an intermediary monitoring system that detects internal pressure and temperature changes caused by electrolyte heating. It mediates between the gas-tight sealing (which prevents contamination) and the potential for internal pressure buildup by providing early warning and triggering safety mode before dangerous pressure levels develop.
Solution Approach 2:
The safety device performs preliminary monitoring of temperature and pressure inside the gas-tight capacitor module, detecting conditions that precede electrolyte boiling and explosive failure. By taking preliminary action to switch to safety mode when threshold values are approached, the system maintains the benefits of gas-tight sealing while preventing catastrophic failures.
4Reliability
If the safety device continuously monitors all operating parameters, then reliability is improved, but device complexity increases
Solution Approach 1:
The safety device is designed as a multi-functional monitoring system that simultaneously tracks temperature, pressure, voltage, and current using integrated sensors and control logic. This universal monitoring approach improves reliability through comprehensive parameter detection while managing complexity by consolidating multiple monitoring functions into a single device rather than separate systems for each parameter.
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 effectively recognizes and mitigates unsafe operating states, preventing damage and potential hazards by timely switching to a safety mode, reducing the risk of capacitor module failure and ensuring safe operation, thereby protecting the system and personnel.
Implementation Method 1
the safety device continuously monitors the temperature inside the capacitor module and initiates the safety operating mode if a specified maximum temperature is exceeded
Implementation Method 2
the safety device can monitor the pressure inside the capacitor module and trigger the safety operating mode if a predetermined maximum pressure is exceeded
Implementation Method 3
the safety device has a strain gauge measuring the spatial extent or size of the capacitor(s); the safety operating mode is started when a predetermined maximum elongation measured value is exceeded
Data Source
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AI summary
The invention relates to an arrangement (10) comprising a capacitor module (20) with at least one capacitor (30). In order for such an arrangement to be operated in a particularly safe manner, the same is provided with a safety device (50) which is connected to the at least one capacitor, monitors the mode of operation of the capacitor (30) or the mode of operation of the capacitor module (20), and switches into a safe mode of operation in case a mode of operation is identified as unsafe.