Battery Management Bus Merging Power and Data Lines
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Solution Overview
Problem
Existing battery management systems for high-capacity batteries in electric vehicles are complex and costly due to the need for multiple insulating components to prevent electrical interference between cell voltage measurement circuits and the central processing unit.
Innovation Solution
A battery management system using control circuits connected in parallel with each cell, where signals representative of physical parameters are transmitted through a power bus only after synchronization, reducing the need for insulating components and simplifying communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating means are used in each connection between cell and central processing unit, then electrical insulation is achieved, but device complexity and cost increase
Solution Approach 1:
The patent merges the power supply function and data communication function into a single shared bus structure. The daisy-chain connection serves both as the power source for control circuits and as the communication pathway, eliminating the need for separate insulated connections for each cell.
Solution Approach 2:
The single bus connection performs multiple functions: it provides power to control circuits, transmits voltage data from each cell, and enables bidirectional communication between control circuits and the central processing unit, replacing multiple specialized insulated connections.
2Object-affected harmful factors
If multiple insulating means are used per cell, then electrical interference is prevented, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple insulation functions into a single insulated bus structure that runs through all cells, replacing the need for multiple discrete insulating components per cell while maintaining electrical isolation where needed.
Solution Approach 2:
The system uses the existing battery cell voltage differentials to power the control circuits directly, eliminating the need for separate power supply insulation. The electrical connections serve themselves by providing both power and communication pathways.
3Reliability
If separate connections are used for power and data, then reliable communication is achieved, but system complexity increases
Solution Approach 1:
The patent merges power delivery and data communication into a single shared bus, where control circuits are powered directly from the battery cells through the same connection used for data transmission, reducing connection count while maintaining reliability through protocol-level power management.
Solution Approach 2:
The single connection serves dual purposes: it provides electrical power to control circuits from the battery cells and simultaneously transmits voltage measurement data bidirectionally, replacing separate power and data connections.
Data Source
AI summary
A system for managing a battery having a plurality of battery cells connected in series, a plurality of control circuits connected in parallel with a battery cell and at least one electrical connection between a first control circuit of a first cell and a second control circuit of a second cell. Each control circuit is capable of emitting a signal representing physical parameters of its respective battery cell. There is a control unit to control the state of the battery on the basis of the signals representative of the physical parameters. There is a power bus electrically connecting said battery cells to one another in series and each control circuit delivers the representative signal via the power bus after reception of a synchronization signal received.