Direct Cell BMS Architecture for Noise-Free EV Battery Diagnosis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional battery management systems fail to accurately diagnose the state of individual battery cells within a battery pack, leading to potential voltage imbalances and increased costs due to the need to replace entire packs, as they only measure overall battery pack data.
Innovation Solution
A system comprising a master BMS and direct BMSs with a battery cell connection unit that directly measures voltage, current, and temperature of each cell, using a first substrate unit to generate analog signals and a second substrate unit to convert these signals into digital form for wireless transmission to the master BMS, implemented on a single semiconductor chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional BMS measures only overall battery pack data, then device complexity is reduced, but measurement precision of individual cells deteriorates
Solution Approach 1:
The patent divides the battery management system into multiple independent direct BMS units, each responsible for monitoring a specific battery cell. Each direct BMS includes separate substrate units for analog signal generation and digital signal processing, enabling individual cell measurement while maintaining manageable system complexity through modular architecture.
2Measurement precision
If direct contact measurement of individual cells is implemented, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent merges the analog substrate unit and digital substrate unit into a single integrated direct BMS unit. This integration combines analog-to-digital conversion, wireless communication, and processing functions into one compact device, reducing overall system complexity while maintaining high measurement precision through direct cell contact.
Solution Approach 2:
The patent introduces substrate units as intermediary components that bridge the gap between battery cells and the master BMS. These substrate units include analog-to-digital converters and wireless transmitters that process signals locally, reducing the complexity of direct connections while preserving measurement accuracy.
3Device complexity
If channel switching is used to measure multiple cells, then device complexity is reduced, but reliability deteriorates due to noise
Solution Approach 1:
The patent replaces mechanical channel switching with direct electrical connections from each battery cell to its dedicated direct BMS unit. Each unit continuously monitors its assigned cell without switching, eliminating mechanical contact noise and improving measurement reliability while maintaining simple system architecture.
4Loss of information
If individual cell monitoring is implemented, then loss of information is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent merges multiple functions (analog signal generation, digital signal processing, wireless communication) into integrated substrate units that are fabricated as single semiconductor chips. This integration reduces manufacturing precision requirements compared to assembling multiple separate components, while still enabling comprehensive individual cell monitoring to prevent information loss.
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 approach allows for precise, noise-free measurement of individual battery cells, reducing manufacturing costs and improving durability and reliability by eliminating channel switching noise and electromagnetic interference, enabling early detection of cell imbalances.
Implementation Method 1
a second substrate unit that converts an analog electrical signal, which is generated by the first substrate unit, into a digital signal to wirelessly transmit the digital signal to the master BMS
Data Source
AI summary
A system for diagnosing a battery cell using a substrate manufactured by an LDCMOS process, includes a master BMS and a plurality of direct BMSs, wherein a battery cell connection unit included in each direct BMS makes direct contact with a positive electrode terminal and a negative electrode terminal of each of a plurality of battery cells of a battery module to measure raw data of voltages of the plurality of battery cells and raw data of a current of the battery module, and in order to accurately process raw data of the voltages of the plurality of battery cells and raw data of the currents, a first substrate unit manufactured by the LDCMOS process and a second substrate unit including a configuration to wirelessly transmit and receive a signal generated and processed by the first substrate unit to and from the master BMS are provided.