Battery Pack Cell Balancing via Capacity Measurement
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Solution Overview
Problem
Energy storage systems face challenges in effectively managing battery cell balancing, leading to inefficiencies and reduced lifespan, especially when integrating renewable energy sources with grid power, as existing technologies struggle to identify and address abnormal battery cells and perform cell balancing operations efficiently.
Innovation Solution
A battery pack and energy storage system that includes a capacity measuring unit, an average value calculator, and a balancing controller to calculate charge capacities, establish standard values for selecting battery cells for discharge, and perform cell balancing operations, ensuring that battery cells with excess charge capacities are balanced to match the average capacity, thereby extending battery lifespan and improving power stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cell balancing operation is performed on all battery cells, then charging efficiency is improved, but energy waste increases due to repeatedly balancing already balanced cells
Solution Approach 1:
The system performs preliminary identification of abnormal battery cells before initiating cell balancing operations. By calculating charge capacities and comparing them against reference values, the system pre-identifies which cells require balancing, thereby avoiding unnecessary balancing operations on already balanced cells and reducing energy waste.
Solution Approach 2:
The battery management system automatically monitors charge capacities and autonomously determines which cells need balancing without external intervention. The controller self-adjusts by performing balancing operations only on identified abnormal cells, making the system self-regulating and energy-efficient.
2Duration of action of stationary object
If cell balancing operation is performed frequently, then battery lifespan is extended, but energy consumption increases
Solution Approach 1:
The system performs preliminary identification of abnormal battery cells before initiating cell balancing operations. By calculating charge capacities and comparing them against reference values, the system pre-identifies which cells require balancing, thereby avoiding unnecessary balancing operations on already balanced cells and reducing energy waste.
Solution Approach 2:
The system dynamically adjusts the balancing operation parameters based on the identified abnormal cells. By changing the operational parameters to target only specific cells that deviate from the reference charge capacity, the system extends battery lifespan while minimizing energy consumption through precise, targeted balancing.
3Measurement precision
If charge capacity measurement is performed with high precision, then cell balancing accuracy is improved, but system complexity increases
Solution Approach 1:
The system replaces complex physical measurement mechanisms with electronic calculation methods. By using the relationship between voltage, current, and time to calculate charge capacity (Q = ∫I dt), the system achieves high measurement precision without requiring complex hardware, thereby reducing system complexity while maintaining accuracy.
Data Source
AI summary
A battery pack, a method of controlling the same, and an energy storage system including the battery pack are disclosed. According to some aspects, the method may include calculating charge capacities of the battery cells, obtaining a first average value, which is an average value of the calculated charge capacities, establishing a first standard value for selecting an abnormal battery cell based on the first average value and determining a first battery cell having the lowest charge capacity from among battery cells having charge capacities greater than the first standard value. A second standard value for selecting a battery cell that is to be discharged during a cell balancing operation may be established. A cell balancing operation with respect to battery cells having charge capacities greater than the second standard value may then be performed. Accordingly, a cell balancing operation may be effectively performed in order to efficiently manage a battery pack.