Battery BMS Daisy Chain with Equalized AFE Communication Load
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Solution Overview
Problem
In large-scale energy storage systems using centralized battery management systems with daisy chain communication technology, the unequal communication power consumption among AFE chips leads to poor battery cell consistency and reduced battery capacity.
Innovation Solution
A daisy chain communication system and method where a master controller transmits command information to multiple slave controllers, and each slave controller transmits data of consistent length to an upstream node, including response information and fake data, to equalize communication power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If daisy chain communication is used to reduce system costs, then system cost is reduced, but communication power consumption becomes unequal among AFE chips
Solution Approach 1:
The patent introduces fake data transmission at specific locations in the daisy chain (remote AFE chips transmit fake data to upstream chips) to create local quality differences. This ensures that each AFE chip transmits and receives the same amount of data (real + fake), equalizing communication power consumption across all chips while maintaining the cost-effective daisy chain architecture
2Reliability
If unequal communication power consumption occurs among AFE chips, then battery cell consistency deteriorates, but this is the natural result of daisy chain data transmission
Solution Approach 1:
The patent makes the communication power consumption homogeneous across all AFE chips by ensuring each chip transmits and receives equal amounts of data. Remote AFE chips transmit fake data to upstream chips, making the data transmission volume consistent throughout the chain, which equalizes power consumption and improves battery cell consistency
3Quantity of substance
If proximal AFE chip consumes more power, then battery capacity of proximal AFE chip decreases, but this is caused by its larger data transmission volume
Solution Approach 1:
The patent converts the harmful effect of unequal power consumption into a beneficial outcome by introducing fake data. The fake data transmitted by remote AFE chips serves to balance the data transmission volume, transforming the power consumption imbalance problem into an equalized state, thereby preserving battery capacity across all chips
Data Source
AI summary
A daisy chain communication system and method, and a battery management system are provided. The daisy chain includes a first slave controller and a plurality of second slave controllers, and a master controller transmits command information to the plurality of second slave controllers through the first slave controller. The daisy chain responses to the command information. A network response period is divided into a plurality of sub phases. The second slave controller transmits transmission data with a consistent data length to a slave controller of an upstream node cascaded therewith at each sub phase; the first slave controller transmits the transmission data from the second slave controller cascaded therewith at each sub phase to the master controller. In the present disclosure, a data length transmitted by each slave controller is consistent, so that equalization of power consumption between corresponding battery modules that supply power to each slave controller is achieved.