Distributed Battery Voltage Balancing for Scalable Power Supply
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Solution Overview
Problem
Existing distributed power supply systems face inefficiencies in voltage balancing due to the need for dedicated balancing circuits that are not scalable and cannot perform continuous charging and discharging simultaneously, leading to reduced balancing efficiency and limited expansion capabilities.
Innovation Solution
A distributed power supply system with a battery management system that communicates with each battery unit to perform real-time voltage balancing, allowing for the addition or removal of units without redesigning the balancing circuit, and enabling continuous charging and discharging by determining target units for balancing based on state information such as voltage or state of charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated balancing circuit is provided between batteries in the battery pack, then voltage balancing between battery modules can be implemented, but the balancing circuit needs to be redesigned when the quantity of battery packs changes, which is not conducive to expansion
Solution Approach 1:
The patent implements a universal balancing circuit design where the same circuit architecture can handle different quantities of battery packs through dynamic configuration. The control device can adaptively adjust the balancing circuit to work with varying numbers of battery modules, eliminating the need for redesign when system capacity changes. This is achieved through a control device that dynamically configures the balancing circuit based on the actual number of battery packs connected.
2Reliability
If the series circuit is disconnected to implement balancing function, then voltage balancing between battery modules can be achieved, but the entire battery pack cannot be charged or discharged
Solution Approach 1:
The patent divides the battery pack into multiple independent battery modules, each with its own balancing capability. The balancing circuit is segmented to work on individual modules or groups of modules without requiring disconnection of the entire series circuit. This allows selective balancing of specific modules while maintaining charging or discharging operations on other modules, thus preserving system productivity during balancing operations.
Solution Approach 2:
The patent implements dynamic switching between series connection for power delivery and parallel connection for balancing, but enables these transitions to occur in a distributed manner across different module groups. The control device dynamically adjusts the configuration of different module groups, allowing some to operate in series for power delivery while others perform balancing, thereby maintaining continuous charging or discharging capability throughout the system.
3Reliability
If the parallel circuit is disconnected during charging or discharging process, then voltage balancing between battery modules can be implemented, but continuous charging and discharging and battery voltage balancing cannot be implemented at the same time
Solution Approach 1:
The patent enables continuous useful action by implementing balancing operations that do not interrupt the charging or discharging process. The distributed balancing circuit allows balancing to be performed on specific module groups while other module groups continue to charge or discharge. This eliminates idle time and ensures that the battery pack continuously delivers power or stores energy without interruption, significantly improving balancing efficiency and reducing time loss.
Data Source
AI summary
A distributed power supply system and a control method. The system includes a battery management system and M battery units, where the battery unit includes a battery management unit and a cell. The battery management system is configured to communicate with the M battery management units to obtain M pieces of state information and send an instruction to a target battery management unit in the M battery management units based on the M pieces of state information. The target battery management unit is configured to control, according to the instruction, voltage balancing for a battery unit in which the target battery unit is located.