Secondary Battery Module Abnormality Detection via Voltage Correlation
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Solution Overview
Problem
Existing methods for detecting abnormalities in secondary battery systems, such as sodium-sulfur batteries, face challenges in identifying the source of internal or external short circuits, which can lead to delayed responses due to gradual changes in electric discharge depth, making it difficult to pinpoint the affected module or block promptly.
Innovation Solution
An apparatus and method that utilize voltage measurement units to detect block voltages, calculate average block voltages, and acquire module information based on a correlation between block and average block voltages, allowing for early identification of abnormalities by comparing reference and actual voltages, with a linear regression processing unit to accelerate computation and improve detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If abnormality detection is performed by comparing electric discharge depth of each block, then the presence of abnormality can be determined for each block and apparatus complexity is reduced, but it becomes difficult to identify the specific module or block with abnormality promptly due to gradual changes
Solution Approach 1:
The invention changes the detection parameter from electric discharge depth to block voltage. By monitoring voltage changes in each block individually, the system achieves both simplified apparatus structure and precise identification of abnormal blocks, resolving the contradiction between device complexity and measurement precision.
Solution Approach 2:
The invention segments the battery system into individual blocks for independent voltage monitoring. Each block is equipped with its own voltage measurement unit, allowing precise identification of which specific block has an abnormality while keeping the overall apparatus structure simple and modular.
2Measurement precision
If detection is performed for each individual battery cell, then abnormality identification precision is improved, but apparatus complexity and production cost increase
Solution Approach 1:
The invention merges multiple battery cells into blocks as the monitoring unit. Instead of detecting each individual cell, the voltage of each block (comprising multiple cells) is measured as a whole. This approach maintains precise abnormality identification at the block level while significantly reducing apparatus complexity and production costs compared to individual cell monitoring.
3Measurement precision
If voltage measurement is performed on a block-by-block basis, then abnormality identification precision is improved, but computation time increases in large systems with numerous blocks
Solution Approach 1:
The invention changes from comprehensive voltage analysis to threshold-based detection. By setting a predetermined threshold value for voltage change, the system quickly identifies abnormal blocks without performing complex computations on all blocks, significantly reducing computation time while maintaining high identification precision.
Solution Approach 2:
The invention performs partial monitoring by focusing only on blocks whose voltage changes exceed the predetermined threshold. Instead of analyzing all blocks in detail, the system quickly identifies and focuses on the abnormal block(s), reducing overall computation time while maintaining accurate abnormality identification.
Data Source
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AI summary
The present invention pertains to a device, method, and program for specifying an abnormality-occurrence area of a secondary battery system. The device has: an information transmission unit (52) for outputting block voltage values and an average block voltage value; an information acquisition unit (54) for acquiring information about a module (22) accommodating a block that has output a block voltage value when the difference between a reference block voltage value obtained from the correlation between the block voltage value and the average block voltage value and the block voltage value is equal to or greater than a preset voltage threshold; a notification reception unit (56) for receiving a notification about the occurrence of an abnormality in a secondary battery; and a module specification unit (58) for specifying at least the module (22) corresponding to the latest module information as the module in which an abnormality occurred when the notification reception unit (56) receives a notification.