Battery Management System Adaptive Wake-Up Control

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Solution Overview

Problem

Existing battery management systems (BMS) require constant monitoring to prevent overdischarge and overcharge, leading to unnecessary power consumption and potential battery degradation, especially in vehicles where the system is always in a wake-up state.

Innovation Solution

A battery management system that monitors the battery state through an electric load and switches to a wake-up state only when necessary, using a relay and controller to compare battery voltage with reference values, outputting a wake-up signal to control the relay's ON/OFF state based on the battery's state of charge (SoC), thereby preventing overdischarge and overcharge.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the BMS maintains constant monitoring to prevent overdischarge and overcharge, then battery safety is improved, but power consumption increases and battery life deteriorates

Engineering Contradiction:

Improvebattery safetyVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The BMS dynamically transitions between wake-up state and sleep state based on battery conditions. The system activates monitoring only when voltage thresholds are exceeded (overcharge or overdischarge conditions) and enters sleep mode during normal operation, making the monitoring behavior adaptive rather than static.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements periodic monitoring through event-triggered wake-up cycles. Instead of continuous monitoring, the BMS wakes up at specific intervals or when triggered by voltage threshold violations, performs necessary checks, and returns to sleep state, creating a periodic monitoring pattern that reduces power consumption while maintaining safety.

Inventive Principle:

Principle #19Periodic action

2Reliability

If the BMS maintains constant monitoring to prevent overdischarge and overcharge, then battery safety is improved, but battery lifespan deteriorates due to unnecessary activation

Engineering Contradiction:

Improvebattery safetyVSAvoidbattery lifespan

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system converts the potentially harmful state of constant monitoring (which accelerates battery degradation) into a beneficial sleep mode that reduces stress on the battery. By sleeping during normal operation and only waking when necessary, the system actually protects the battery from degradation caused by continuous electrical activity.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Measurement precision

If the BMS switches to wake-up state frequently to monitor battery state, then monitoring accuracy is improved, but power consumption increases

Engineering Contradiction:

Improvemonitoring accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The electric load serves as an intermediary that indirectly monitors battery voltage by comparing it against reference values. Instead of the BMS directly and continuously monitoring battery state, the electric load performs voltage comparison and triggers wake-up signals only when necessary, reducing the monitoring burden on the BMS.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The electric load performs self-verification by comparing battery voltage against reference values and autonomously generates wake-up signals when thresholds are violated. This self-service mechanism eliminates the need for continuous BMS intervention, allowing the system to maintain accuracy while consuming less power.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS10491019B2Battery management system and method of controlling the same

Publication Date: 2019.11.26 HYUNDAI MOTOR CO LTD

AI summary

A battery management system (BMS) may include a battery, a relay configured to electrically connect and disconnect the battery for supplying a voltage (an electric power) to an electric load to and from the electric load, the electric load configured to receive the voltage (the electric power) from the battery, to compare the received voltage (the electric power) with a reference value and to output a wakeup signal according to the compared result, when the relay is electrically connected, and a controller configured to wake up by the wakeup signal, to monitor a state of the battery and to control a state of the relay. It is possible to prevent overdischarge and overcharge of the battery by monitoring the battery through the electric load in a state in which a vehicle is turned off and switching the BSM to a wakeup state only if necessary.