Battery Module Balancing Control for Faster Parallel Pack Equalization
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Solution Overview
Problem
Current battery balancing systems are inefficient in reducing the time required for balancing battery modules in parallel configurations, as they lack a systematic approach to quickly identify and address voltage, current, and temperature deviations between modules.
Innovation Solution
A battery balancing system that includes a controller, balancing control block, battery state determination block, and balancing block, which uses selection signals and multiplexers to determine the state of battery modules and perform balancing by activating specific rows and connecting modules to balancing modules based on abnormal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If battery modules are arranged in parallel configuration, then the battery pack capacity is increased, but the balancing time is extended due to the need to monitor and compensate voltage, current, and temperature deviations between multiple modules
Solution Approach 1:
The battery pack is divided into multiple battery modules arranged in a matrix configuration (first row with first and second modules, second row with third and fourth modules). Each module is independently monitored by control circuits that measure voltage, current, and temperature separately, enabling parallel processing of balancing operations across multiple modules simultaneously, thus reducing total balancing time while maintaining increased pack capacity
Solution Approach 2:
The control circuits continuously monitor and determine the state of each battery module in advance before full balancing is required. By pre-identifying modules that need balancing through continuous state determination, the system can prepare balancing operations ahead of time and execute them more efficiently when needed, reducing the actual balancing time
2Productivity
If multiple battery modules are monitored and balanced simultaneously, then the balancing efficiency is improved, but the system complexity increases due to the need for multiple control circuits and state determination blocks
Solution Approach 1:
The control circuits are designed with multi-functionality to perform multiple tasks: monitoring voltage, current, and temperature; determining module states; and executing balancing operations. The state determination block similarly handles multiple modules through a unified architecture that processes signals from various control circuits, reducing the need for separate dedicated components for each function and thereby managing system complexity while improving balancing efficiency
Solution Approach 2:
Multiple control circuits are merged into a coordinated system where they share common signal processing pathways and control logic. The state determination block consolidates the monitoring functions for all battery modules into a single integrated unit that receives signals from multiple control circuits and processes them through a unified state determination algorithm, reducing overall system complexity while enabling simultaneous monitoring of multiple modules
Data Source
AI summary
Disclosed is a battery balancing system, which includes a battery pack block including a first battery module and a second battery module arranged in a first row and a third battery module and a fourth battery module arranged in a second row, a balancing control block including first control circuits respectively connected to the first battery module and the second battery module in the first row and second control circuits respectively connected to the third battery module and the fourth battery module in the second row, a battery state determination block that receives output signals from the first control circuits and the second control circuits to determine states of the first to fourth battery modules, and a controller that applies a first row selection signal to the first control circuits and applies a second row selection signal to the second control circuits.