Distributed Battery Balance Management via Module Circuits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery systems face inefficiencies in managing voltage balance across multiple battery modules due to centralized control, leading to prolonged delays in addressing voltage imbalances, especially when the number of modules and batteries is high, resulting in complex and time-consuming processing.
Innovation Solution
A distributed battery balance management method that allows each battery module to independently perform voltage balance control through a communication interface, using module balance management circuits to set duty ratios and enable/disable balancing circuits based on voltage differences, enabling faster and more efficient voltage balancing across the entire system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centralized control is used for voltage balance management, then system-wide coordination is achieved, but processing complexity and response time increase significantly
Solution Approach 1:
The patent divides the centralized battery management system into distributed module balance management circuits (MBMCs), where each MBMC independently manages voltage balance for its associated battery module. This segmentation reduces the processing burden on the central controller and enables parallel operation of multiple MBMCs, thereby reducing overall system complexity while maintaining voltage balance control reliability.
2Reliability
If centralized control processes all voltage balance information, then comprehensive system control is achieved, but response time becomes excessively long
Solution Approach 1:
The patent segments the voltage balance management function into independent MBMC units that operate in parallel. Each MBMC processes voltage information for its specific battery module independently, eliminating the sequential processing bottleneck of centralized control. This enables simultaneous detection and correction of voltage imbalances across multiple modules, significantly reducing response time while maintaining reliable system-wide voltage balance control.
3Productivity
If distributed control is implemented for faster response, then response time is reduced, but system coordination complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where each MBMC continuously monitors battery voltages and communicates with the central controller. The central controller receives status information from all MBMCs and provides coordination commands when necessary. This feedback loop enables distributed MBMCs to operate autonomously for immediate response while maintaining system-wide coordination through the central controller, resolving the complexity issue of purely distributed control.
Solution Approach 2:
The patent designs the MBMC with multi-functional capabilities that can operate in both autonomous and coordinated modes. The MBMC can independently perform voltage detection, balance determination, and correction operations, while also serving as a communication node in the distributed network. This universal design reduces system coordination complexity by enabling each unit to handle multiple functions locally, reducing the need for centralized micromanagement.
Data Source
AI summary
A distributed battery balance management method includes: performing a battery system balancing procedure by a battery system balance management unit and performing battery module balancing procedure by module balance management circuit (MBMC) of corresponding battery module (BM). The battery system balancing procedure includes: obtaining lowest module voltages of corresponding BMs; obtaining a lowest system voltage and an average system voltage of the battery system; determining whether the lowest module voltage of the corresponding BM is greater than the average system voltage; when yes, setting a balance time duty ratio of the corresponding MBMC as a first duty ratio; when no, setting the balance time duty ratio of the corresponding MBMC as a second duty ratio; and setting module balance enable signal of corresponding MBMC to be enable, thus allowing the corresponding BM to perform voltage balance control on the batteries in the corresponding BM.