Battery Pressure Sensing for Accurate Lithium Plating Detection
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Solution Overview
Problem
Existing methods for detecting lithium precipitation in batteries rely heavily on electrical signals, which are inadequate for accurately determining the presence and extent of lithium precipitation, leading to potential safety risks such as short circuits, combustion, and explosions due to lithium dendrite formation.
Innovation Solution
A method utilizing pressure data from predetermined positions within the battery to detect lithium precipitation by comparing actually measured pressure data with reference pressure data, accounting for conditions like temperature and electricity amount, to accurately determine the presence and amount of lithium precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical signals are used for detecting lithium precipitation, then the detection method is simple, but the detection accuracy is insufficient leading to safety risks
Solution Approach 1:
The detection system is segmented into multiple independent pressure sensors positioned at different locations within the battery pack, each monitoring specific regions. This segmentation enables more comprehensive coverage and accurate localization of lithium precipitation events while maintaining modular system architecture that balances complexity with detection precision.
Solution Approach 2:
The invention transitions from one-dimensional electrical signal detection to three-dimensional pressure field monitoring by deploying sensors at multiple spatial positions (first position near battery cells, second position at battery pack level). This dimensional expansion enables accurate detection of pressure differentials that indicate lithium precipitation, significantly improving measurement precision while distributing system complexity across multiple simple sensor nodes.
2Reliability
If pressure data from multiple positions is used, then detection accuracy improves, but system complexity increases
Solution Approach 1:
The pressure sensing system is designed with multi-functionality where the same sensor architecture serves multiple purposes: detecting lithium precipitation through pressure differentials, monitoring overall battery pack health, and providing early warning for thermal runaway. This universal approach improves detection reliability without proportionally increasing system complexity, as a single sensor deployment achieves multiple detection objectives simultaneously.
Solution Approach 2:
The invention introduces pressure data as an intermediary parameter that mediates between physical lithium precipitation events and detection system responses. By measuring pressure differentials at multiple positions and processing these intermediate signals through comparison logic, the system achieves high detection reliability while keeping individual sensor units simple and the overall architecture manageable.
3Loss of time
If pressure sensors are installed at predetermined positions, then early detection capability improves, but manufacturing complexity increases
Solution Approach 1:
Pressure sensors are pre-positioned at predetermined locations within the battery pack structure during manufacturing, with the first position arranged near battery cells and the second position at the battery pack level. This preliminary placement enables immediate detection capability from the first moment of operation, reducing detection response time while establishing a standardized assembly process that maintains manufacturing ease through repeatable positioning procedures.
Solution Approach 2:
The detection system implements local quality by placing the first pressure sensor in close proximity to specific battery cells where lithium precipitation is most likely to occur first, while the second sensor monitors the overall pack environment. This localized sensing strategy achieves early detection capability at critical points without requiring uniform sensor distribution throughout the entire battery pack, thereby maintaining ease of manufacture while improving detection timeliness.
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
This approach provides accurate detection of lithium precipitation, reducing errors and enabling early warning of potential safety hazards by correlating pressure changes with lithium precipitation states, applicable to various battery types and conditions.
Implementation Method 1
acquiring pressure data of a predetermined position of the battery; and detecting lithium precipitation of the battery according to the pressure data and reference pressure data
Data Source
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AI summary
Embodiments of the present application provide a method for detecting lithium precipitation of a battery and a related apparatus. The method may include: acquiring pressure data of a predetermined position of the battery; and detecting lithium precipitation of the battery according to the pressure data and reference pressure data, the pressure data including actually measured pressure data of the battery, and the reference pressure data including pressure data related to a predetermined amount of lithium precipitation of the battery under a predetermined condition.