Multi-Battery Authority Switching for Stable EV Power Output
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Solution Overview
Problem
The communication and computation loads on the vehicle controller of electrically assisted bicycles with multiple battery packs are increased due to the need for monitoring and managing multiple battery packs, which affects the stability and efficiency of power supply.
Innovation Solution
A battery control system where battery packs can transmit and receive internal information among themselves to determine and transfer authority for power output, allowing the vehicle controller to bypass direct monitoring and switching processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If multiple battery packs are mounted on the electrically assisted bicycle to increase travel distance, then the travel distance is extended, but the communication load and computation load on the vehicle controller are increased
Solution Approach 1:
The patent divides the control system into hierarchical segments: the vehicle controller handles high-level decisions, while each battery pack's controller handles low-level monitoring and authority management. This segmentation allows multiple battery packs to be managed without proportionally increasing the vehicle controller's load, as each battery pack controller independently monitors its own battery pack's state and participates in authority determination through mutual communication with other battery pack controllers.
Solution Approach 2:
The patent introduces battery pack controllers as intermediary devices between the vehicle controller and the battery packs. These intermediary controllers perform preliminary monitoring and processing, filtering information before it reaches the vehicle controller. The authority determination process involves mutual communication among battery pack controllers, acting as intermediaries that resolve switching decisions locally before notifying the vehicle controller, thereby reducing the vehicle controller's computation load.
2Reliability
If the vehicle controller monitors and manages multiple battery packs directly, then power supply control is achieved, but the stability and efficiency of power supply are reduced due to increased load
Solution Approach 1:
The patent implements self-service mechanisms where battery pack controllers autonomously monitor their respective battery packs' states (charge level, temperature, health) and independently participate in authority determination through mutual communication. The system automatically detects when authority switching is needed based on predefined criteria (such as charge levels or temperature thresholds) without requiring continuous vehicle controller intervention, thereby maintaining reliable power supply control while improving efficiency by reducing the vehicle controller's processing burden.
Data Source
AI summary
A battery control system for an electric vehicle includes a plurality of battery packs each including an authorized battery pack having authority to output electric power to drive an electric motor to generate drive power for the electric vehicle, and an unauthorized battery pack not having the authority. A plurality of controllers of the plurality of battery packs are configured or programmed to mutually transmit/receive internal information on states of the respective battery packs. At least one of the plurality of controllers is configured or programmed to change the authorized battery pack to another battery pack among the plurality of battery packs based on the internal information.