Battery Cell Control With Virtual Modulator Offset Correction
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Solution Overview
Problem
Current battery arrangements in electric and hybrid electric vehicles face limitations in charging cycles, performance, capacity, and operating conditions, which pose challenges in effectively controlling the battery for efficient electric drive technology.
Innovation Solution
A battery arrangement comprising multiple battery cells connected in series, with battery cell controllers acting as slave nodes and a master node providing a virtual modulator signal to correct signal offsets, allowing for improved control and accuracy in battery management, enabling efficient energy supply to electric motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional battery control without offset correction is used, then device complexity is reduced, but measurement precision deteriorates due to signal offsets affecting control accuracy
Solution Approach 1:
The master node pre-calculates and transmits offset correction values to slave nodes before actual control operations. This preliminary correction action eliminates signal offsets at the source, improving measurement precision without requiring complex real-time correction circuits at each slave node
Solution Approach 2:
The master node acts as an intermediary that centralizes the offset correction function. Instead of each slave node requiring complex self-correction capabilities, the master node processes offset measurements and distributes correction values, simplifying individual slave node design while maintaining high measurement precision
2Reliability
If individual battery cells can disconnect independently, then reliability improves by isolating failed cells, but device complexity increases due to additional control requirements
Solution Approach 1:
The battery pack is segmented into independently controllable cells, each with its own slave node capable of disconnecting from the series string. This segmentation allows failed cells to be isolated without affecting other cells, improving reliability while the centralized master node manages the complexity of coordination
Solution Approach 2:
Each battery cell is equipped with its own slave node that can autonomously disconnect the cell from the series string when a failure is detected. This self-service capability allows individual cells to protect themselves and the overall pack without requiring complex external intervention, improving reliability while maintaining manageable system complexity through the master-slave architecture
Data Source
AI summary
According to an embodiment, it is a battery arrangement comprising plurality of battery cells, of which a first sub-number connected in series form a first string, a second sub-number connected in series form a second string, and a third sub-number connected in series form a third string, the first string, the second string, and the third string are connectable to an electric machine as one respective phase; plurality of battery cell controllers forming plurality of slave nodes, each of the battery cell controllers connected to at least one terminal of an assigned one of the battery cells, and a respective battery cell controller comprising at least a power electronics arrangement to selectively connect or disconnect the terminal; and a master node, configured to provide a virtual modulator signal to the slave nodes; and wherein the battery cell controllers are configured to correct signal generation based on the virtual modulator signal.