Energy Storage Misuse Detection via Voltage Threshold Control
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Solution Overview
Problem
Energy storage devices with lower charge voltages, such as lithium ion batteries, are prone to overcharging when mistakenly mounted in vehicles designed for lead-acid batteries, leading to potential troubles and misuse detection is challenging.
Innovation Solution
An energy storage apparatus with a current interrupt device, voltage detection unit, and control unit that switches to an interruption state when an overcharge state is detected, and maintains this state if the number of switching instructions exceeds a predetermined value, preventing further misuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a control method for lead-acid batteries is applied to energy storage devices with lower charge voltage, then the energy storage device can be charged using existing charging systems, but the energy storage device will be overcharged causing troubles
Solution Approach 1:
The control unit performs preliminary detection of the energy storage device's voltage before charging and establishes a voltage threshold in advance. During charging, it continuously monitors whether the voltage exceeds this pre-set threshold, enabling proactive prevention of overcharging before it causes damage to the device.
Solution Approach 2:
The control unit implements a feedback mechanism by continuously detecting the voltage of the energy storage device during charging and comparing it against the predetermined threshold. When the voltage exceeds the threshold, the system automatically interrupts the charging current, creating a closed-loop control system that adapts to the actual charging state and prevents overcharging.
2Ease of operation
If the energy storage device is mounted to a vehicle with similar outer shape and connector to lead-acid battery, then installation is simplified, but misuse detection becomes difficult
Solution Approach 1:
The system employs voltage level detection as an identifier to distinguish between different types of energy storage devices. By measuring the characteristic voltage levels and charging curves of the device, the control unit can identify whether a lithium-ion battery or other low-voltage device has been installed, even when the physical appearance and connectors are identical to lead-acid batteries.
3Reliability
If frequent switching instruction is issued to prevent overcharge, then overcharge protection is enhanced, but device complexity increases
Solution Approach 1:
The control unit implements periodic voltage detection during the charging process, checking the voltage at regular intervals rather than continuously. This periodic monitoring approach provides sufficient overcharge protection while reducing the computational burden and control complexity compared to continuous real-time monitoring, achieving a balance between safety and system simplicity.
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 prevents the occurrence of troubles on energy storage devices by prohibiting their use when misuse is detected, ensuring the safety and longevity of the device and the vehicle system.
Implementation Method 1
a voltage detection unit that detects voltage of the energy storage device
Data Source
AI summary
An energy storage apparatus includes: an energy storage device which is connected to a vehicle load and a vehicle power generator; a current interrupt device that causes the energy storage device and the vehicle load as well as the energy storage device and the vehicle power generator to be in a conduction state or in an interruption state; a voltage detection unit that detects voltage of the energy storage device; and a control unit. The control unit executes: a switching instruction process in which, when determining that the electric storage device will reach an overcharge state on the basis of the voltage, the control unit issues an interruption switching instruction to the current interrupt device; and an interruption maintaining process in which, when the number of times of the switching instruction process exceeds a predetermined value, the control unit issues an instruction to maintain the interruption state.