Battery Cell Balancing With Continuous Current and Voltage Sensing
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Solution Overview
Problem
Current cell balancing methods in battery systems require periodic interruption to obtain cell-level measurements, such as state of charge, voltage, and current, which is inefficient and complicates the balancing process.
Innovation Solution
A battery pack with cell monitoring devices (CMDs) that continuously measure cell-level voltage, charge, and balancing current, allowing for real-time monitoring and control of the balancing process without interruption, using passive balancing techniques and wireless communication between CMDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If periodic interruption is used to obtain cell-level measurements, then measurement accuracy is improved, but productivity deteriorates due to balancing procedure stops
Solution Approach 1:
The patent implements continuous cell balancing by using separate measurement and control circuits that can operate simultaneously without interruption. The measurement circuit continuously monitors cell parameters while the control circuit adjusts balancing currents, eliminating the need to stop the balancing procedure for measurements and maintaining continuous useful action throughout the process
2Reliability
If periodic stopping of balancing procedure is implemented, then measurement reliability is improved, but loss of time increases due to interruptions
Solution Approach 1:
The system maintains continuous balancing operation by implementing real-time measurement and control circuits that work simultaneously. The measurement circuit continuously acquires cell data while the control circuit processes this information and adjusts balancing currents without any interruption to the overall balancing procedure, eliminating time loss from periodic stops
3Device complexity
If cell balancing is performed without continuous measurement, then device complexity is reduced, but loss of information occurs regarding real-time cell state
Solution Approach 1:
The patent implements a feedback control system where the measurement circuit continuously monitors cell parameters and feeds this information to the control circuit. The control circuit uses this real-time feedback to adjust balancing currents dynamically, ensuring optimal balancing performance while maintaining relatively simple device architecture through efficient use of feedback information
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
Enables continuous cell balancing with improved efficiency and accuracy by allowing simultaneous measurement and control of cell properties, reducing energy waste, and enabling precise balancing without disrupting the charging or discharging process.
Implementation Method 1
Each CMD comprises a first measuring unit comprising at least one sensor configured to obtain a cell-level voltage measurement and/or a cell-level charge measurement of the respective cell
Implementation Method 2
The balance control unit is further configured to balance passively the respective cell upon discharging or charging of the battery pack
Implementation Method 3
Each CMD further comprises a second measuring unit configured to measure a cell-level balancing current of the respective cell during the cell balancing
Data Source
AI summary
The present disclosure relates to a battery pack of an electric battery system, for balancing individual cells within the battery pack with respect to voltage, charge and/or state of charge. The electric battery system comprises at least one pack, each pack comprising a plurality of battery cells, and each battery cell is monitored via a cell monitoring device (CMD), which provides cell-level measurements. Cell balancing is provided in a manner which allows for the simultaneous measuring of a cell-level balancing current and a cell-level balancing voltage during the balancing. Such measuring allows for control of the cell balancing without having to continuously interrupt and restart the cell balancing procedure.