EV Battery Leakage Warning Using Collision and Presence Detection
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Solution Overview
Problem
Existing battery state notification systems for electric vehicles fail to effectively prevent electrical shocks to people after a collision, as they do not adequately address the risk of electric leakage from high-voltage drive batteries.
Innovation Solution
A battery state notification apparatus that includes a collision detector, electric leakage detector, surrounding condition detector, and vehicle exterior sounding device, which notifies individuals of electric leakage from the drive battery only when a collision is detected and a person is present, using power from an auxiliary battery to minimize electrical shock risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive battery is coupled only to a drive circuit and switches are turned off upon collision detection, then the vehicle safety is improved, but the ability to notify rescuers of electric leakage state is lost
Solution Approach 1:
The patent divides the battery system into two independent power sources: the drive battery (high voltage, large capacity) coupled only to the drive circuit, and the auxiliary battery (low voltage, small capacity) coupled to the notification apparatus. This segmentation allows the notification system to remain operational after collision while the drive battery switches are turned off for safety.
Solution Approach 2:
The auxiliary battery serves as an intermediary power source that enables the notification apparatus to detect and communicate electric leakage state from the drive battery without requiring the drive battery's own power. This mediator allows information transmission while maintaining safety isolation.
2Reliability
If the notification apparatus operates continuously to detect electric leakage, then the safety notification capability is improved, but the power consumption increases
Solution Approach 1:
The notification apparatus operates periodically rather than continuously. The control unit activates the sounding device only when electric leakage is detected or when needed for notification, rather than maintaining constant operation. This periodic activation significantly reduces power consumption while maintaining safety notification capability.
Solution Approach 2:
The auxiliary battery, being a small-capacity battery, is managed to operate only when necessary for notification purposes. The system automatically manages its own power consumption by activating notification only when electric leakage is detected or when rescuer presence is confirmed, avoiding unnecessary power drain.
3Loss of information
If the vehicle exterior sounding device outputs sound continuously after collision, then the notification effectiveness is improved, but the power from auxiliary battery is depleted quickly
Solution Approach 1:
The sounding device outputs sound periodically or on-demand rather than continuously. The control unit activates the sounding device only when electric leakage is detected or when notification is needed, extending the auxiliary battery's operation duration while maintaining notification effectiveness.
Solution Approach 2:
The system uses feedback from the electric leakage detector and surrounding condition detector to control the sounding device activation. The notification is triggered only when necessary conditions are met (electric leakage detected, rescuer presence confirmed), optimizing both notification effectiveness and battery duration.
4Loss of time
If the notification is made without detecting surrounding conditions, then the response time is reduced, but the risk of electrical shock to rescuers increases
Solution Approach 1:
The surrounding condition detector performs preliminary detection of rescuer presence before the notification is fully activated. The control unit uses this preliminary information to determine whether and how to activate the sounding device, enabling faster response while assessing safety conditions.
Solution Approach 2:
The system uses feedback from the surrounding condition detector to dynamically control the notification activation. When rescuers are detected near the vehicle, the system activates notification to warn them of electric leakage, balancing rapid response with safety awareness.
Data Source
AI summary
A battery state notification apparatus for an electric vehicle includes a collision detector, an electric leakage detector, a surrounding condition detector, a vehicle exterior sounding device, and a battery state notification device. The collision detector detects a collision of the electric vehicle. The electric leakage detector detects a state of the electric leakage from the drive battery. The surrounding condition detector detects a surrounding condition including the presence of a person around the electric vehicle. The vehicle exterior sounding device outputs a sound to the outside of the electric vehicle. The battery state notification device causes the vehicle exterior sounding device to make notification about the state of electric leakage from the drive battery in a case where the collision detector detects the collision of the electric vehicle and where the surrounding condition detector detects the presence of the person around the electric vehicle.