Battery Interface Pressure Sensing to Prevent E-Carrier Power Loss
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Solution Overview
Problem
Electric carriers, such as vehicles and bicycles, experience sudden power failures due to poor contact between on-board batteries and battery interfaces, potentially leading to accidents, as vibrations cause loose connections over time.
Innovation Solution
An electric-carrier power-supply device equipped with a piezoresistive sensor and power-management unit (PMU) that detects pressure values between the battery interface and on-board battery, converting them into resistance values to determine safe contact conditions, and includes a displacement-driving device to adjust the battery interface's position, issuing warnings and reducing motor speed when loose connections are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spring-contact type or plug type battery interface is used, then the battery can be easily connected and disconnected, but vibration during operation causes poor contact after long-term use, leading to power failure
Solution Approach 1:
The piezoresistive sensor is installed in advance in the battery interface to detect contact pressure before power failure occurs. The system preliminarily monitors the contact state and issues warnings or adjusts motor output before actual power failure, preventing the harmful effect of sudden power loss during operation
Solution Approach 2:
The piezoresistive sensor provides real-time feedback on contact pressure between the battery and interface. The power management unit receives this feedback signal and adjusts motor output based on the contact state, creating a closed-loop control system that maintains reliable operation by continuously monitoring and responding to contact conditions
2Reliability
If the battery interface is tightly connected to the on-board battery, then contact stability is improved, but excessive contact pressure may damage the battery or interface components
Solution Approach 1:
The system changes the monitoring parameter from binary (connected/not connected) to continuous (contact pressure value). The piezoresistive sensor measures the actual contact pressure, allowing the power management unit to detect both insufficient contact and excessive pressure, and adjust motor output accordingly to prevent damage while maintaining stable operation
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
Prevents sudden power failures by maintaining optimal contact between the battery interface and on-board battery, reducing the risk of accidents and ensuring safe operation by adjusting the battery interface's position to prevent both loose and excessive contact.
Implementation Method 1
A piezoresistive strain gage is disposed between a contact area between the battery interface and the on-board battery, and is used to detect a pressure value of the contact area
Data Source
AI summary
An electric-carrier power-supply device for use in an electric carrier is provided. The electric-carrier power-supply device includes a piezoresistive sensor, a battery interface, and a power-management unit (PMU). The battery interface is connected to an on-board battery and receives power from the on-board battery. The PMU controls power to a motor of the electric carrier. A piezoresistive strain gage is disposed between a contact area between the battery interface and the on-board battery, and is used to detect a pressure value of the contact area. The piezoresistive sensor receives the pressure value detected by the piezoresistive strain gage, and converts the pressure value into a resistance value. The piezoresistive sensor determines whether the resistance value is within a safe resistance value range to generate a resistance-value-determination signal. The PMU determines whether to provide power to the motor is according to the resistance-value-determination signal.