Battery Module Resistance Diagnosis for Abnormal Cell Group Detection
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Solution Overview
Problem
Existing technologies struggle to accurately and quickly diagnose the state of battery modules, which can lead to abnormal situations due to connection problems, thermal imbalances, and non-uniform degradation among battery cells.
Innovation Solution
A battery diagnosing apparatus and method that includes a resistance measuring unit to measure internal resistances of battery modules and a control unit to calculate criterion resistances, set resistance sections, and diagnose the state of each battery module based on measured resistances and connection structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of battery cells in a battery module increases, then the capacity and energy density improve, but the risk of abnormal situations (connection problems, thermal imbalance, non-uniform degradation) increases
Solution Approach 1:
The battery module is divided into multiple battery cell groups, and resistance measurement is performed separately for each group. This segmentation allows individual monitoring of each group's state, enabling early detection of abnormal conditions in specific groups while maintaining high overall capacity through the increased number of cells.
2Ease of manufacture
If traditional resistance measurement methods are used, then the measurement process is simple, but the diagnosis accuracy of battery module state is insufficient
Solution Approach 1:
Different resistance measurement methods are applied to different battery cell groups based on their specific characteristics and connection structures. The control unit selectively measures resistance using appropriate methods (such as different current injection techniques) for each group, thereby improving diagnosis accuracy for each local region while maintaining overall measurement feasibility.
Solution Approach 2:
The patent employs multiple resistance measurement methods that utilize different electrical parameters (such as varying current magnitudes, measurement timing, or excitation frequencies) to measure battery cell group resistance. By changing measurement parameters according to the specific battery configuration and state, the system achieves higher diagnosis accuracy without significantly complicating the measurement process.
3Reliability
If comprehensive resistance measurement of all battery modules is performed, then the diagnosis coverage is complete, but the time consumption and complexity increase
Solution Approach 1:
The control unit performs preliminary analysis of battery module data (such as voltage, temperature, and historical resistance) to identify battery cell groups that require resistance measurement. By pre-screening and selecting only those groups showing abnormal characteristics or requiring monitoring, the system achieves comprehensive diagnosis coverage for problematic areas while reducing unnecessary measurements and time consumption.
Solution Approach 2:
Instead of measuring all battery cell groups with the same thoroughness, the patent applies partial measurement strategies where only certain groups (those with higher risk or abnormal indicators) undergo detailed resistance measurement. This selective approach maintains adequate diagnosis coverage for critical areas while reducing overall measurement time and complexity through targeted rather than exhaustive inspection.
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
The solution enables more accurate diagnosis of battery module states by using stricter standards, improving diagnosis accuracy, and allowing for timely replacement or inspection of abnormal battery modules to prevent potential hazards.
Implementation Method 1
a resistance measuring unit configured to measure an internal resistance of each of a plurality of battery modules including one or more battery cells
Data Source
AI summary
Discussed is a battery diagnosing apparatus that can include a resistance measuring unit configured to measure an internal resistance of each of a plurality of battery modules including one or more battery cells, and a control unit configured to receive resistance information about the internal resistance of each of the plurality of battery modules from the resistance measuring unit, calculate a first criterion resistance and an absolute deviation between the first criterion resistance and the internal resistance, convert the calculated absolute deviation into a resistance deviation for the plurality of battery modules based on the resistance information, set a first resistance section based on the calculated first criterion resistance and the calculated resistance deviation, select a part of the plurality of battery modules as a target module based on the resistance information, and calculate a second criterion resistance for the target module based on the resistance information.