Battery Management Device Voltage Protection Mode

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Solution Overview

Problem

Electric and hybrid vehicles face voltage drops due to external conditions, which can damage the battery and are not effectively managed by existing technologies.

Innovation Solution

A battery management device that enters or releases a protection mode based on battery voltage, using a controller to detect voltages and limit power, and includes features like temperature and current detection to determine charging and discharging limitations, ensuring battery safety and efficient power control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the battery operates without protection mode, then power availability is maintained, but battery damage occurs due to voltage drops

Engineering Contradiction:

Improvebattery safetyVSAvoidpower availability

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The battery management device enters protection mode in advance when voltage drops to a first threshold level, preventing further voltage decline that would cause battery damage. This preliminary protective action sacrifices some power availability temporarily but ensures battery safety before critical damage occurs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts between protection mode and normal operation based on real-time voltage conditions. When voltage recovers to a second threshold level, the device exits protection mode and restores full power availability, creating a dynamic response that balances battery safety with power needs.

Inventive Principle:

Principle #15Dynamics

2Reliability

If protection mode is entered immediately when voltage drops, then battery damage is prevented, but power interruption occurs

Engineering Contradiction:

Improvebattery protectionVSAvoidpower interruption duration

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The battery management device implements periodic monitoring of voltage levels and uses hysteresis-based threshold switching. By requiring voltage to recover to a higher second threshold before exiting protection mode, the system ensures stable conditions are met, reducing unnecessary mode switching and minimizing power interruption duration while maintaining battery protection.

Inventive Principle:

Principle #19Periodic action

3Productivity

If voltage monitoring thresholds are set close together, then power availability is maximized, but battery damage risk increases

Engineering Contradiction:

Improvepower availabilityVSAvoidbattery safety

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system uses asymmetric voltage thresholds where the exit threshold (second level) is higher than the entry threshold (first level). This asymmetric design creates a hysteresis buffer zone that prevents oscillation between protection and normal modes, maximizing power availability within safe operating margins while maintaining battery protection.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS10946761B2Battery management device, vehicle having the same, and method for controlling the vehicle

Publication Date: 2021.03.16 HYUNDAI MOTOR CO LTD

AI summary

A battery management device for preventing a battery from being damaged by a low voltage includes a storage configured to store a first protection voltage and a second protection voltage corresponding to a protection mode of the battery; a voltage detector configured to detect a voltage of the battery; a controller configured to confirm the detected voltage, to enter the protection mode when the detected voltage of the battery is the first protection voltage, to check a time point when the detected voltage of the battery is the second protection voltage, and to release the protection mode when a predetermined time elapses from the time point.