Battery Pack BMS Wireless Wake Scheduling for Low Parked Power Drain
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Solution Overview
Problem
Existing battery pack management systems face issues with power consumption and reliability due to wired communication methods between master and slave BMS, leading to circuit failures, increased complexity, and unnecessary battery drain, especially when vehicles are parked for extended periods.
Innovation Solution
A battery pack management device that employs a wireless communication method between the master and slave BMS, with a slave wireless communicator that can be turned on or off based on predetermined periods, parking time, battery voltage, temperature, and traveling patterns to minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wired communication method is used between master BMS and slave BMS, then data transmission reliability is improved, but device complexity and manufacturing cost increase due to connectors and cables
Solution Approach 1:
The patent replaces the mechanical wired communication system (connectors and cables) with a wireless communication system using RF signals. The master BMS and slave BMS exchange data through electromagnetic waves without physical connections, eliminating mechanical wear and contact failures while reducing structural complexity.
Solution Approach 2:
The patent extracts and removes the connector and cable components from the communication system. By eliminating these intermediate physical elements, the system achieves direct wireless communication between BMS units, reducing manufacturing costs and assembly complexity while maintaining data transmission functionality.
2Device complexity
If wireless communication method is used between master BMS and slave BMS, then device complexity is reduced, but power consumption increases due to continuous operation of receiving unit
Solution Approach 1:
The patent implements periodic action by having the slave BMS receiving unit operate in alternating on/off cycles. Instead of continuous operation, the receiver is activated only during scheduled communication intervals and remains off during idle periods, significantly reducing power consumption while maintaining communication functionality.
Solution Approach 2:
The patent applies dynamics by making the receiving unit's operational state variable rather than fixed. The receiver dynamically switches between active and inactive states based on communication requirements, allowing the system to adapt power consumption levels to actual operational needs.
3Speed
If slave BMS receiving unit is always turned on for wireless communication, then communication responsiveness is improved, but battery power is unnecessarily consumed during vehicle parking
Solution Approach 1:
The patent uses periodic action by scheduling the receiving unit to operate only during specific time intervals when communication is expected to occur. During vehicle parking periods, the receiver remains off and activates only when the vehicle is in operation or when communication events are anticipated, preventing unnecessary energy loss.
Solution Approach 2:
The patent applies preliminary anti-action by proactively turning off the receiving unit during periods when communication is not needed (vehicle parking). This preventive measure counteracts potential energy waste before it occurs, ensuring battery power is preserved during idle periods while maintaining responsiveness when needed.
Data Source
AI summary
A battery pack management device capable of reducing power consumption while transmitting and receiving data between a master BMS and a slave BMS by using a wireless communication method. The battery pack management device according to the present disclosure includes: a master BMS including an external communicator, an internal communicator, and a master controller and a slave BMS including a power supply, a state measurement sensor, a slave wireless communicator, and a slave controller.