Modular EV Charging Power Control Without a Master BMS
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Solution Overview
Problem
Conventional electric vehicle charging systems using multiple batteries face safety degradation and high costs due to the need for a master battery management system (BMS), and they fail to supply power when individual battery modules reach low state of charge, leading to incomplete charging.
Innovation Solution
An electric vehicle charging system with a control module that individually manages and merges power from multiple battery modules, allowing seamless power supply to the vehicle without a master BMS, by switching to remaining modules or external power when necessary, and using capacitors for temporary power continuity during module replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a master battery management system is used to manage multiple battery modules, then the charging capacity is increased, but the system cost and complexity increase significantly
Solution Approach 1:
The system divides the battery management function into independent individual BMS units, each managing one battery module autonomously. This segmentation eliminates the need for a centralized master BMS, reducing system complexity while maintaining the ability to manage multiple battery modules for increased charging capacity.
Solution Approach 2:
Each battery module operates with its own independent BMS that autonomously manages charging and discharging operations. The individual BMS units self-manage their respective battery modules without requiring coordination from a master controller, simplifying the overall system architecture.
2Reliability
If multiple battery modules are used to increase charging capacity, then the power supply reliability is improved, but the safety risks increase
Solution Approach 1:
By segmenting the battery system into independent modules with separate BMS units, the patent isolates potential safety hazards to individual modules. If one module experiences a safety issue, it does not affect other modules, thereby maintaining overall system reliability while managing safety risks.
Solution Approach 2:
The individual BMS units act as intermediaries between the battery modules and the external power source/vehicle. Each BMS monitors and controls its battery module's electrical parameters, preventing harmful conditions from developing and propagating through the system.
3Device complexity
If individual battery modules are independently managed, then the system cost is reduced, but the power supply continuity may be affected when one module depletes
Solution Approach 1:
The patent combines multiple independently managed battery modules into a unified power supply system. The individual BMS units coordinate their operations to provide continuous power to the vehicle, ensuring that when one module depletes, others can continue supplying power without interruption.
Solution Approach 2:
The system is designed to maintain continuous power supply to the vehicle by coordinating multiple battery modules. When one module's charge is depleted, the individual BMS units manage the transition to other modules seamlessly, ensuring uninterrupted power delivery.
Data Source
AI summary
An electric vehicle charging system comprising a plurality of batteries, and a power supply method using same are provided. In various embodiments, the electric vehicle charging system comprising a plurality of batteries comprises: an electric vehicle charging module including a plurality of battery modules; and a control module for controlling operation of the electric vehicle charging module, wherein, when an electric vehicle is electrically connected to the electric vehicle charging module, the control module controls operation of the electric vehicle charging module such that power that is output from the plurality of battery modules is supplied to the electric vehicle, and individually controls, on the basis of the state of each of the plurality of battery modules, power to be output from each of the plurality of battery modules.