Cell-Mounted Monolithic IC for Battery Voltage Monitoring
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Solution Overview
Problem
Existing battery management systems in hybrid-electric and battery electric vehicles face challenges in efficiently measuring and transmitting data about battery cells, particularly in ensuring accurate cell voltage monitoring and minimizing current draw to extend battery life and optimize capacity.
Innovation Solution
A battery system with a ceramic substrate and a monolithic integrated circuit that measures and transmits data about the battery cell, using a thermally and electrically conductive adhesive to mount the substrate to the cell can, and employing mesh networking for efficient RF communication between substrate boards and a central battery energy control module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a battery management system continuously monitors and transmits cell voltage data, then measurement precision and data accuracy are improved, but current consumption increases
Solution Approach 1:
The system implements periodic measurement cycles where the BMIC monitors cell voltages at scheduled intervals rather than continuously. The processor enters low-power sleep modes between measurement cycles, activating only when data collection is required. This periodic operation maintains measurement precision while dramatically reducing average current consumption from the battery cells.
Solution Approach 2:
The system employs feedback mechanisms where the BMIC continuously monitors cell voltages and provides real-time data to the processor. When voltage deviations or anomalies are detected through this feedback loop, the system triggers targeted measurements and communications only when necessary, rather than operating at full power continuously. This feedback-driven approach optimizes the balance between monitoring accuracy and energy consumption.
2Loss of information
If multiple substrate boards communicate with a central control module, then data transmission completeness is improved, but device complexity increases
Solution Approach 1:
The battery management system is segmented into multiple independent substrate boards, each equipped with its own BMIC and processor. Each substrate board autonomously monitors its associated battery cells and communicates findings to a central control module. This segmentation distributes the monitoring workload across multiple simple units rather than requiring one complex centralized system, improving data completeness while managing complexity through modular architecture.
Solution Approach 2:
Each substrate board is designed with universal functionality to perform identical monitoring, measurement, and communication tasks. Every BMIC can independently measure cell voltages, process data, and transmit information using the same protocol and interface. This universality simplifies the overall system design by using standardized components throughout, reducing the complexity that would arise from heterogeneous specialized modules while ensuring complete data coverage across all battery cells.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables accurate and efficient monitoring of battery cell voltages, minimizes current consumption, and optimizes battery capacity by ensuring precise data transmission and cell balancing, thereby enhancing the performance and longevity of battery systems in electric vehicles.
Implementation Method 1
a ceramic substrate, including a patterned metallized surface, mounted to the can via a thermally conductive adhesive
Implementation Method 2
a monolithic integrated circuit that measures and transmits data about the cell
Data Source
AI summary
A battery system has a battery cell including a can, and a ceramic substrate, including a patterned metallized surface, mounted to the can via a thermally conductive adhesive. The battery system also has a monolithic integrated circuit that measures and transmits data about the cell mounted to the patterned metallized surface such that the ceramic substrate and monolithic integrated circuit are electrically isolated from one another.