Battery Current Interruption Diagnosis Using Bypass Discharge
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Solution Overview
Problem
Current interruption devices in batteries for vehicles face challenges in accurate failure diagnosis, leading to potential power failures due to incorrect determination of their open or closed states, which can occur even when the vehicle system's state interferes with the diagnosis.
Innovation Solution
An energy storage apparatus with a discharge circuit and failure diagnosis device that discharges electricity from the energy storage cell, comparing voltage changes at the external terminal and the energy storage cell before and after discharging to accurately diagnose the current interruption device's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the current interruption device is monitored using the vehicle system's state, then the diagnosis can be performed during normal operation, but the accuracy of failure diagnosis deteriorates due to interference from the vehicle system's state
Solution Approach 1:
The patent extracts the current interruption device from the vehicle system's electrical network by using a separate discharge circuit that bypasses the vehicle's power supply system. The diagnosis circuit measures voltage changes locally at the current interruption device during controlled discharge, eliminating interference from the vehicle system's state while maintaining ease of operation through integrated diagnosis capability
Solution Approach 2:
The patent introduces a discharge circuit as an intermediary component that enables isolated measurement of voltage changes across the current interruption device. This intermediary circuit allows the diagnosis system to create a controlled test condition independent of the vehicle's operational state, thereby improving measurement precision without compromising operational ease
2Productivity
If the current interruption device is kept in a closed state for normal operation, then power supply to the vehicle is maintained, but the risk of undetected failures increases
Solution Approach 1:
The patent implements preliminary failure detection by continuously monitoring voltage changes across the current interruption device during normal closed-state operation. The diagnosis circuit is ready to detect anomalies before they lead to power failure, allowing preventive maintenance while maintaining power supply continuity through the closed state
Solution Approach 2:
The patent establishes a feedback mechanism where the diagnosis circuit continuously monitors the electrical state of the current interruption device and provides information about its health status. This feedback enables the system to detect failures early while the device remains in the closed state, balancing productivity and reliability
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
Enhances the accuracy of failure diagnosis by distinguishing between open and closed states of the current interruption device, preventing power failures and malfunctions by detecting issues early and enabling redundancy circuit operation.
Implementation Method 1
diagnoses a failure of the current interruption device based on a change in voltage of the external terminal before and after discharging electricity
Data Source
AI summary
An energy storage apparatus includes: an external terminal; an energy storage cell; a current interruption device that has one end electrically connected to the external terminal and the other end electrically connected to the energy storage cell; a discharge circuit that discharges electricity from the energy storage cell via a path that does not pass through the current interruption device; and a failure diagnosis device. The failure diagnosis device discharges electricity from the energy storage cell using the discharge circuit, and diagnoses a failure of the current interruption device based on a change in voltage ΔV1 of the external terminal before and after discharging electricity.