Battery Cell Circuit Comparison Signaling for BMS Bandwidth Limits
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Solution Overview
Problem
Existing communication systems in battery management systems, such as those in automotive applications, face inefficiencies in bandwidth usage and performance due to the need to transmit full data sets repeatedly, which can lead to increased current consumption and reduced diagnostic coverage.
Innovation Solution
Devices in the system determine a comparison result value based on a reference value, refraining from transmitting full data sets by comparing actual values against expected values, thereby reducing data transmission to delta values or comparison results, enhancing bandwidth efficiency and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If full data sets are transmitted repeatedly in communication systems, then complete information is provided to the controller, but bandwidth usage increases and current consumption increases
Solution Approach 1:
The patent extracts only the essential comparison result from the full data set transmission. Instead of sending complete data sets, the system transmits only the comparison outcome (match/mismatch indicator), which is the critical information needed for diagnostic purposes, thereby reducing current consumption while maintaining information completeness.
Solution Approach 2:
The system performs partial action by transmitting only the necessary comparison result rather than the entire data set. This partial transmission approach provides sufficient information for the controller to perform diagnostics without the excessive energy cost of full data transmission.
2Reliability
If full data sets are transmitted repeatedly, then complete diagnostic information is available, but bandwidth usage increases and update speed decreases
Solution Approach 1:
The patent extracts the essential diagnostic information into a compact comparison result format. The controller receives only the comparison outcome (whether data matches expected values), which maintains diagnostic coverage while enabling faster update periods due to reduced transmission time.
3Loss of energy
If comparison result values are used instead of full data sets, then bandwidth usage is optimized and current consumption is reduced, but data transmission complexity increases
Solution Approach 1:
The comparison operation is performed in advance at the device level before transmission. The device compares its data against expected values locally and pre-processes the information into a comparison result, simplifying the subsequent communication protocol and reducing the burden on the communication system.
4Loss of information
If comparison operations are performed at the device level, then data transmission is reduced, but device processing requirements increase
Solution Approach 1:
The device performs self-service by conducting the comparison operation autonomously using its own processing capabilities. The device compares its data against stored expected values and generates the comparison result independently, reducing the need for complex external processing while improving data transmission efficiency.
Data Source
AI summary
A battery cell circuit of a battery management system configured to receive, from a previous battery cell circuit of a plurality of battery cell circuits connected in a daisy chain configuration or ring configuration, an instruction requesting a value for the battery cell circuit and determine a comparison result value based on a comparison of the value for the battery cell circuit and a reference value. The battery cell circuit is further configured to output, to a controller, the comparison result value, wherein, to output the comparison result value, the battery cell circuit is configured to refrain from outputting the value for the battery cell circuit.