Battery Communication System Shared Path Data Integrity
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Solution Overview
Problem
Existing battery monitoring systems in electrified vehicles face challenges in efficiently monitoring and transmitting battery data from high voltage battery packs, particularly in ensuring data integrity and maintaining communication pathways without disrupting the status signals generated by heartbeat circuits.
Innovation Solution
A battery communication system that includes a battery monitoring integrated circuit (BMIC) with a heartbeat generation circuit, a calibration microcontroller for storing battery data, and a main microcontroller with data transmission and reception circuits, utilizing a shared path for transmitting battery data and status signals, with a data transmission node connecting the calibration and main microcontrollers, and employing cyclic redundancy checks for data integrity verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shared communication path is used for both status signals and battery data, then device complexity is reduced, but data integrity and communication reliability may deteriorate
Solution Approach 1:
The patent segments the communication protocol into distinct phases: status signal transmission phase and battery data transmission phase. The main microcontroller selectively activates either status signal monitoring or battery data reception based on communication mode, allowing both functions to share the same physical path without interference while maintaining data integrity through protocol-level separation.
2Reliability
If battery data is transmitted frequently to ensure data integrity, then data reliability is improved, but energy consumption and communication overhead increase
Solution Approach 1:
The patent implements a feedback mechanism where the main microcontroller requests battery data from the calibration microcontroller only when specific conditions are met (e.g., status signal anomalies detected, or periodic polling intervals). This selective data transmission based on feedback from system status reduces unnecessary communications while ensuring data integrity is maintained when actually needed.
Solution Approach 2:
The system employs periodic polling where the main microcontroller requests battery data at predetermined time intervals rather than continuously. This periodic action ensures data integrity through regular updates while significantly reducing energy consumption compared to continuous transmission by keeping the communication path idle between polling cycles.
3Reliability
If separate communication paths are used for status signals and battery data, then communication reliability is improved, but device complexity and number of components increase
Solution Approach 1:
The patent makes the communication path dynamic by allowing the main microcontroller to switch between different communication modes: status signal monitoring mode and battery data reception mode. The same physical communication path dynamically serves different functions based on system needs, achieving the reliability of separate paths while maintaining the simplicity of a shared physical structure through temporal separation of functions.
Data Source
AI summary
A battery pack according to an exemplary aspect of the present disclosure includes, among other things, a battery monitoring integrated circuit (BMIC) associated with a grouping of battery cells, a calibration microcontroller configured to store battery data associated with the grouping of battery cells, a main microcontroller; and a data transmission node establishing a shared path for communicating both a status signal from the BMIC and the battery data from the calibration microcontroller.