Battery Pack Module Voltage Balancing via Current Deviation Feedback
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Solution Overview
Problem
High-voltage battery packs in environmentally-friendly vehicles face current consumption deviations between monitoring circuits, leading to voltage imbalances between battery modules, which affect efficient energy storage and usage.
Innovation Solution
A battery pack design that includes multiple cell stacks, monitoring circuits, current measurement circuits, current adjustment circuits, and a battery controller to detect and adjust current consumption deviations, using current detection resistors and short-circuit switches to minimize imbalances between modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monitoring circuits are used to detect cell voltages for cell balancing, then cell balancing function is improved, but current consumption deviation between monitoring circuits causes voltage imbalance between battery modules
Solution Approach 1:
The patent implements a feedback mechanism where the battery controller continuously monitors current consumption of each monitoring circuit through current measurement circuits, calculates current consumption deviation, and adjusts discharge currents of cell stacks accordingly. This closed-loop feedback system compensates for the voltage imbalance caused by monitoring circuit current consumption deviations, thereby maintaining voltage balance between battery modules while preserving the cell balancing function.
Solution Approach 2:
The patent changes the discharge current parameter of cell stacks based on detected current consumption deviations of monitoring circuits. By dynamically adjusting the discharge current of each cell stack according to its monitoring circuit's current consumption characteristics, the system compensates for voltage imbalances and maintains overall battery module voltage balance.
2Measurement precision
If current measurement circuits are added to measure monitoring circuit current consumption, then current consumption deviation can be detected, but device complexity increases
Solution Approach 1:
The patent merges the current measurement function with the existing monitoring circuit system. Current measurement circuits are integrated into the battery management structure, sharing common control resources and communication interfaces with the monitoring circuits. This consolidation allows for precise current consumption measurement while minimizing additional device complexity through resource sharing and functional integration.
Solution Approach 2:
The battery controller is designed with multi-functionality, handling both cell voltage monitoring and current consumption measurement tasks. By making the controller universal and capable of performing multiple functions, the patent avoids adding separate dedicated control units, thereby reducing overall device complexity while maintaining precise measurement capabilities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively minimizes current consumption deviations between monitoring circuits, thereby reducing voltage imbalances between battery modules, ensuring efficient and balanced energy storage and usage in high-voltage battery packs.
Implementation Method 1
each of the measurement circuits may measure a current flowing through a corresponding current detection resistor among the current detection resistors
Implementation Method 2
a plurality of short-circuit switches respectively connected between the cell stacks and the monitoring circuits
Data Source
AI summary
A battery pack may include: a plurality of cell stacks; a plurality of monitoring circuits configured to detect voltages of a plurality of cells included in a corresponding cell stack among the cell stacks; a plurality of current measurement circuits configured to measure current consumption of a corresponding monitoring circuit among the monitoring circuits; a plurality of current adjustment circuits configured to adjust a discharge current of a corresponding cell stack among the cell stacks; and a battery controller configured to receive a current consumption measurement result of the monitoring circuits from the current measurement circuits, to calculate current consumption deviation between the monitoring circuits based on the current consumption measurement result of the monitoring circuits, and to control the current adjustment circuits based on the current consumption deviation.