BMS Wake-Up Power Supply Using High-Voltage Battery Timing
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Solution Overview
Problem
Conventional battery management systems (BMS) in electric vehicles enter a sleep state when disconnected from lead-acid batteries, leading to a loss of data monitoring and potential battery degradation due to lack of power, necessitating a solution to maintain BMS functionality without relying on lead-acid batteries.
Innovation Solution
A power supply guarantee system that periodically wakes up the BMS using a high voltage battery pack and timing device, converting high voltage energy into low voltage energy to power the BMS, allowing it to collect and store data without relying on lead-acid batteries, thereby reducing lead-acid battery loss and extending its life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the BMS enters a sleep state when disconnected from lead-acid batteries, then energy consumption is reduced, but the BMS loses data monitoring capability and cannot detect battery abnormalities
Solution Approach 1:
The system implements periodic wake-up of the BMS at predetermined time intervals. The control unit receives wake-up instructions and activates the BMS periodically, allowing it to perform data monitoring and detection tasks intermittently rather than continuously, thus balancing energy savings with monitoring reliability
Solution Approach 2:
The control unit acts as an intermediary between the wake-up instruction receiver and the BMS. It manages the wake-up timing and coordination, enabling the BMS to be activated only when necessary for monitoring, thereby reducing overall energy consumption while maintaining monitoring capability
2Reliability
If the BMS remains continuously powered, then data monitoring and detection capability is maintained, but lead-acid battery life is reduced due to continuous discharge
Solution Approach 1:
The BMS is activated periodically rather than continuously. The control unit receives wake-up instructions and activates the BMS at predetermined intervals, significantly reducing the cumulative discharge time of the lead-acid battery while ensuring the monitoring function is performed regularly
Solution Approach 2:
The system pre-establishes wake-up time intervals and prepares the BMS for periodic activation. By planning wake-up events in advance rather than continuous operation, the system reduces unnecessary battery discharge while ensuring monitoring coverage
3Reliability
If the BMS is periodically woken up using lead-acid battery power, then monitoring capability is maintained, but lead-acid battery degradation increases
Solution Approach 1:
The control unit serves as an intermediary that manages power distribution during wake-up events. It coordinates the wake-up process to minimize power draw from the lead-acid battery, and in some configurations can source power from alternative sources like the power battery, thereby reducing degradation of the lead-acid battery while maintaining monitoring capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures the BMS remains operational and capable of monitoring and storing data in real-time, reducing lead-acid battery degradation and maintaining system functionality even when the vehicle is not in use.
Implementation Method 1
a power conversion module configured to convert the high voltage electrical energy into low voltage electrical energy, and use the low voltage electrical energy to power the BMS
Data Source
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AI summary
This application discloses a power supply guarantee system and a power supply guarantee method. The power supply guarantee system is applied to a battery management system (BMS). The power supply guarantee system includes: a main control module, configured to send a received wake-up time to a timing device; a high voltage power module, configured to power the timing device according to electrical energy in a high voltage battery pack; the timing device, configured to set a wake-up clock according to the wake-up time, start timing when the BMS enters sleep, and send a discharge instruction to the high voltage battery pack when the timing reaches the wake-up time; and a power conversion module, configured to convert high voltage electrical energy into low voltage electrical energy, and use the low voltage electrical energy to power the BMS, where the high voltage electrical energy is output by the high voltage battery pack according to the discharge instruction. According to the power supply guarantee system disclosed herein, when the BMS is in a sleep state, a power supply keeps being provided to the BMS to ensure normal operation of the BMS and reduce loss of lead acid.