Battery Cell Control Network With Clocked Power Signaling
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Solution Overview
Problem
Existing battery systems for motor vehicles face challenges in reliable communication and power supply to sub-control units, particularly due to the complexity of balancing individual battery cells and potential failures, which affect the overall system's reliability and efficiency.
Innovation Solution
A battery system with a main control unit that supplies sub-control units via a clocked voltage signal, enabling bidirectional communication and power distribution, and includes redundant signal paths for fault tolerance, along with capacitive or inductive isolation for efficient energy management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple battery cells are connected in series with rigid circuit configuration, then voltage and current pattern is obtained, but switch-on and switch-off of individual battery cells becomes difficult or impossible
Solution Approach 1:
The battery system is divided into multiple independently controllable modules, each with its own control unit. This segmentation allows individual battery cells or groups of cells to be switched on or off independently while maintaining the series connection for voltage accumulation, resolving the contradiction between rigid voltage pattern and flexible cell switching.
Solution Approach 2:
The circuit configuration transitions from rigid to dynamic through the introduction of switching devices controlled by control units. Each battery cell module can dynamically change its connection state (series/parallel or connected/disconnected) based on system requirements, enabling both voltage pattern control and individual cell switching.
2Reliability
If higher-order control unit processes balancing decisions for all battery cells sequentially, then balancing control is achieved, but high data rate and communication complexity arise
Solution Approach 1:
The control function is segmented and distributed to individual control units assigned to each battery cell or module. Each control unit independently monitors and controls its assigned cell, eliminating the need for centralized sequential processing and significantly reducing communication data rates while maintaining balancing control effectiveness.
Solution Approach 2:
Each battery cell module is equipped with its own control unit that autonomously makes balancing decisions for its assigned cell based on local measurements and simple control logic. This self-service approach eliminates the communication bottleneck where a central unit must process all cell data sequentially.
3Ease of manufacture
If sub-control units are supplied with current from assigned battery cells, then power supply is simplified, but reliable operation is compromised due to possible cell failures
Solution Approach 1:
A dedicated power supply unit or intermediary power source is introduced to supply power to control units, separating the control power supply from the battery cells. This intermediary approach simplifies the power configuration while ensuring reliable operation of control units even when battery cells fail or are in protective states.
4Extent of automation
If bidirectional communication is implemented between main control unit and sub-control units, then control and monitoring capability is enhanced, but communication reliability is reduced due to potential failures
Solution Approach 1:
Communication and control functions are localized to individual battery cell modules with dedicated control units. Each control unit has local monitoring and control capabilities, reducing the criticality of bidirectional communication with the main control unit and maintaining system functionality even when communication fails.
Data Source
AI summary
A battery system for a motor vehicle. The battery system includes an actuating unit, a main control unit, multiple sub-control units, and multiple battery cells. The actuating unit is in signal communication with the sub-control units for data acquisition from the sub-control units. Each sub-control unit is in signal communication with a battery cell for data acquisition from the assigned battery cell. The main control unit is electrically connected to the sub-control units supplying power to the sub-control units. A method for operating a battery system is also described.