Vehicle Battery Management System Preventing Over-Discharge
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Solution Overview
Problem
Vehicle batteries face over-discharge issues due to continuous power demand from devices like black boxes, which can lead to insufficient charge for vehicle operation when the ignition is off, as existing technologies fail to effectively manage battery discharge.
Innovation Solution
A battery management system that includes a sensing unit to measure battery current and voltage, a relay connected between the battery and electronic loads, and a controller to turn off the relay when the battery state reaches a predefined sleep reference value, preventing over-discharge and reconnecting when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the relay remains connected between the battery and electronic loads, then the electronic devices can continuously access power, but the battery will be fully discharged and the vehicle cannot be driven
Solution Approach 1:
The controller continuously monitors battery voltage through the sensing unit and automatically controls the relay based on real-time voltage feedback. When voltage drops below a threshold, the relay is turned off to prevent over-discharge; when voltage recovers, the relay is turned on again, creating a closed-loop control system that balances power supply needs with battery protection
Solution Approach 2:
The system automatically manages its own power distribution without requiring external intervention. The controller autonomously decides when to connect or disconnect the relay based on battery status, and the system can self-recover by recharging the battery when the ignition is on, eliminating the need for manual battery management
2Duration of action of stationary object
If a voltage threshold control is implemented to prevent over-discharge, then battery lifespan is extended, but the system complexity increases with additional sensing and control components
Solution Approach 1:
The controller integrates multiple functions into a single component: it manages the relay control for power distribution, monitors battery voltage through the sensing unit, determines when to activate or deactivate the relay, and coordinates with the ignition system. This multi-functionality reduces the need for separate dedicated components for each function
Solution Approach 2:
The relay serves as an intermediary component that physically connects or disconnects the battery from electronic loads based on controller commands. This intermediary mechanism provides a simple, reliable way to control power flow without requiring complex circuitry, acting as a mechanical bridge between the electrical control signal and the physical power connection
Data Source
AI summary
A battery management system for a vehicle is provided to prevent current consumption of a battery by operating a relay connected between the battery and electronic loads to prevent an over-discharge of the battery. The battery management system includes a sensing unit that is configured to measure a current and a voltage of a battery for a vehicle and a relay that is connected between the battery for the vehicle and electronic units of the vehicle. Additionally, a controller is configured to receive data from the sensing unit to turn off the relay.