Battery Cell Balancing with Abnormal Cell Diagnosis
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Solution Overview
Problem
Existing battery systems face inefficiencies in cell balancing, leading to decreased usable capacity and increased risk of overcharging due to manufacturing dispersion and cell deterioration, which can result in invalid balancing when not properly addressing cell imbalances, especially in the presence of weak or high-impedance cells.
Innovation Solution
A battery system with a monitoring unit and control unit that diagnoses abnormal cells, calculates a reference voltage for balancing, and performs cell balancing within an equalization target range, using a virtual reference cell to prevent invalid balancing and enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cell balancing is performed without diagnosing abnormal cells, then balancing process is simple, but invalid balancing occurs and usable capacity decreases
Solution Approach 1:
The control unit performs preliminary diagnosis of abnormal battery cells (weak cells, high-impedance cells, internal short circuit cells) before executing the cell balancing process. This preliminary identification allows the system to adjust balancing strategies accordingly, preventing invalid balancing operations that would occur with conventional methods that do not diagnose cell conditions first.
Solution Approach 2:
The monitoring unit continuously monitors parameters of each battery cell and provides feedback to the control unit. Based on this feedback, the control unit determines the presence of abnormal cells and dynamically adjusts the balancing control strategy, creating a closed-loop system that improves balancing accuracy while maintaining reasonable control complexity through automated decision-making.
2Reliability
If cell balancing is performed without identifying abnormal cells, then operation is simple, but overcharging risk increases
Solution Approach 1:
Before performing cell balancing, the control unit executes a preliminary identification process to detect abnormal battery cells using monitored parameters. This preliminary action enables the system to set appropriate balancing targets and prevent overcharging of healthy cells while focusing on bringing abnormal cells to acceptable voltage levels, thereby improving safety without significantly complicating the overall operation.
Solution Approach 2:
The battery management system performs automatic diagnosis and self-adjustment of balancing strategies based on monitored cell conditions. The control unit autonomously identifies abnormal cells and modifies balancing operations accordingly, reducing the need for manual intervention while enhancing safety through intelligent, condition-based control.
3Productivity
If conventional balancing method is used, then device complexity is low, but capacity transfer efficiency decreases
Solution Approach 1:
The control unit performs preliminary identification of abnormal battery cells and determines their specific conditions (weak cell, high-impedance cell, or internal short circuit cell) before executing the balancing process. This preliminary analysis enables the system to calculate optimized balancing targets and control strategies that maximize capacity transfer efficiency by focusing on the specific needs of each abnormal cell type rather than applying uniform balancing to all cells.
Solution Approach 2:
The control unit applies differentiated balancing strategies tailored to the specific type and condition of each abnormal battery cell. Instead of uniform balancing, the system adjusts balancing targets and control parameters locally for each cell based on its diagnosed condition, thereby optimizing capacity transfer efficiency for the overall battery module while managing complexity through automated local adjustments.
Data Source
AI summary
A battery system includes a battery module that includes a plurality of battery cells, a monitoring unit configured to monitor a parameter of each of the battery cells, and a control unit configured to determine whether there is an abnormal battery cell in the battery module using the parameter, to calculate a reference voltage for balancing the battery cells when it is determined that there is an abnormal battery cell in the battery module, and to control cell balancing of the battery cells to an equalization target range.