Battery Pack Control Bus Segmentation for Data Reliability
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Solution Overview
Problem
Existing battery systems face challenges in maintaining optimal cell operation and balancing cell states due to rapid changes in set points and priority classifications, which can disrupt data transmission and cell selection processes.
Innovation Solution
Implementing a dual data transmission bus system, where a fast unidirectional bus handles set point data and a slow bidirectional bus handles priority classification updates, ensuring efficient communication and cell configuration adjustments based on priority classifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single data transmission bus is used for both set point data and priority classification updates, then device complexity is reduced, but data transmission reliability deteriorates due to interference between rapid set point changes and priority table updates
Solution Approach 1:
The patent divides the single data transmission bus into two separate buses: a fast unidirectional bus for transmitting set point data from master to slave control circuits, and a slow bidirectional bus for transmitting priority classification updates. This segmentation eliminates interference between the two data streams while maintaining manageable system complexity through dedicated communication channels for each function.
2Productivity
If set point data transmission speed is increased to follow rapid set point changes, then productivity is improved, but data transmission stability deteriorates due to conflicts with priority table update transmissions
Solution Approach 1:
The patent creates separate transmission channels with different speed characteristics: the fast unidirectional bus is optimized for rapid set point data transmission to achieve high productivity, while the slow bidirectional bus handles priority table updates at a reduced speed to ensure stability. This allows each bus to operate at its optimal speed without interfering with the other.
Solution Approach 2:
The patent implements dynamic transmission strategies where the fast bus continuously transmits set point data at high speed to track rapid changes, while the slow bus periodically updates priority classifications. The slave control circuits are designed to process fast set point changes immediately while integrating slower priority updates, creating a dynamic response system that maintains both speed and stability.
3Manufacturing precision
If priority classification updates are transmitted frequently to maintain optimal cell balancing, then manufacturing precision is improved, but loss of time increases due to repeated transmissions interrupting set point data flow
Solution Approach 1:
The patent separates priority classification updates from set point data transmissions by using dedicated slow bidirectional bus. This allows frequent priority updates to be transmitted without interrupting the fast unidirectional bus carrying set point data, thus maintaining both cell balancing precision and continuous operation without time loss.
Solution Approach 2:
The patent implements periodic transmission of priority classification updates through the slow bidirectional bus, synchronized with the fast set point data transmissions on the separate unidirectional bus. This periodic action ensures cells are regularly rebalanced while maintaining continuous high-speed response to set point changes, optimizing both precision and time efficiency.
Data Source
AI summary
A method of controlling a battery including a first control circuit and a plurality of modules arranged in series between first and second terminals, each module including electric cells and switches and a second switch control circuit, the battery further including at least one first data transmission bus coupling the first control circuit to each second control circuit, the method including the transmission, by the first control circuit to the second control circuits, of first data representative of an electric cell configuration to be obtained to follow a set point for the delivery of a voltage and/or of a current between the first and second terminals, the second control circuits connecting or disconnecting the electric cells based on said first data and on a classification of the priorities of the electric cells.