Low-Voltage Battery Wake-Up Control for Vehicle Sleep Drain
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Solution Overview
Problem
New energy vehicles require a high quiescent current in sleep mode, which is harmful to low-voltage batteries and can lead to failure if the battery voltage is not maintained above a specific level, necessitating a strategy to monitor and replenish the battery effectively.
Innovation Solution
A power replenishment wake-up apparatus and method that includes a timing unit, charge monitoring unit, voltage monitoring unit, and comparison unit to simultaneously monitor state of charge, voltage, and sleep time, sending a wake-up signal for power replenishment when thresholds are met, ensuring the low-voltage battery is kept at a good charge level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high quiescent current is used in sleep mode to quickly respond to remote vehicle control and monitor high-voltage lithium battery, then the low-voltage battery can independently supply energy required for the vehicle, but the low-voltage battery will be harmful and may deplete
Solution Approach 1:
The system performs preliminary monitoring of battery voltage and state of charge during sleep mode, and preemptively sends wake-up signals to the power replenishment system before the battery depletes to critical levels. This allows the vehicle to maintain high quiescent current for reliable remote control and monitoring while preventing battery exhaustion through advance detection and action.
Solution Approach 2:
The system continuously monitors battery voltage and state of charge, compares these values against predefined thresholds, and provides feedback by triggering wake-up signals when thresholds are approached. This closed-loop feedback mechanism ensures the battery maintains sufficient charge while allowing high quiescent current operation for vehicle responsiveness.
2Measurement precision
If multiple monitoring functions (timing, charge, voltage) are simultaneously performed, then the battery status can be accurately assessed, but the system complexity increases
Solution Approach 1:
The monitoring system is designed with multi-functional units that can perform multiple tasks. The timing unit tracks sleep duration, the charge monitoring unit assesses state of charge, and the voltage monitoring unit measures battery voltage. These unified monitoring functions collectively provide comprehensive battery status assessment without requiring separate dedicated systems for each parameter, thereby reducing overall system complexity while maintaining high measurement precision.
Data Source
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AI summary
The disclosure relates to a power replenishment wake-up apparatus and method for a low-voltage battery. The low-voltage battery is applied to a vehicle, and the power replenishment wake-up apparatus includes: a timing unit, a charge monitoring unit, a voltage monitoring unit, and a comparison unit. The timing unit is configured to: start timing when the vehicle enters a vehicle sleep state. The charge monitoring unit and the voltage monitoring unit are respectively configured to monitor a state of charge and a voltage of a low-voltage battery. The comparison unit is configured to: receive a time value from the timing unit, and compare the time value with a first time threshold; receive a value of the state of charge from the charge monitoring unit, and compare the value of the state of charge with a charge threshold; receive a value of the voltage from the voltage monitoring unit, and compare the value of the voltage with a voltage threshold; and send a wake-up signal for power replenishment of the low-voltage battery when the time value is greater than the first time threshold, and/or the value of the state of charge is less than the charge threshold and/or the value of the voltage is less than the voltage threshold for a second time threshold.