Wireless Battery Management System Relay Protection
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Solution Overview
Problem
The existing wireless battery management systems for battery packs face challenges in protecting battery modules from over voltage, under voltage, and over temperature due to maloperation of the wireless communication unit in slave controllers, which prevents effective communication with the master controller.
Innovation Solution
A wireless battery management system that includes slave controllers with operational parameter measurement circuits, power supplies, and wireless communication circuits, along with a master controller that can turn off relays when fault signals are received, ensuring protection of battery modules by managing operational parameters and activating/deactivating communication functions as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If wireless communication is used between slave controllers and master controller, then spatial efficiency is improved and physical cables are removed, but reliability deteriorates due to maloperation of wireless communication unit
Solution Approach 1:
The slave controller continuously monitors operational parameters (voltage, temperature) and prepares fault signals in advance. When a fault is detected, the controller immediately transmits the pre-prepared fault signal to the master controller without waiting for communication unit activation, ensuring timely protection action.
Solution Approach 2:
The system implements redundant protection mechanisms where the slave controller can independently detect faults and trigger protection signals through the wireless communication unit. This cushioning mechanism ensures that even if the communication unit maloperates, the battery protection function remains available through alternative detection paths.
2Reliability
If wireless communication unit is continuously activated, then communication reliability is improved, but energy consumption increases
Solution Approach 1:
The wireless communication unit operates periodically rather than continuously. The slave controller transmits operational parameters at predetermined time intervals and activates the communication unit only when needed for data transmission, thereby reducing energy consumption while maintaining communication functionality.
Solution Approach 2:
The slave controller autonomously determines when communication is needed based on operational parameter changes. The controller activates the wireless communication unit only when fault conditions are detected or when scheduled transmission times arrive, eliminating the need for continuous operation and reducing power consumption.
Data Source
AI summary
Disclosed are a wireless battery management system and a method for protecting a battery pack using the same. The battery pack includes a plurality of battery modules and at least one relay. The wireless battery management system includes a plurality of slave controllers electrically coupled to the plurality of battery modules one-to-one, and a master controller wirelessly coupled to each slave controller so as to be able to communicate with each slave controller. Each slave controller measures an operational parameter of the battery module electrically coupled thereto. Each slave controller wirelessly transmits a fault signal to the master controller when the measured operational parameter is outside of a predetermined normal range. The master controller turns off the at least one relay when the fault signal is received.