Flexible Sealed Body Abnormality Detector for Battery Deformation
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Solution Overview
Problem
Existing methods for detecting abnormalities such as heat generation in articles, like lithium-ion batteries, are either too large and costly or require complex configurations, making them unsuitable for small devices like mobile phones, and struggle with accurately measuring minute changes in shape and power consumption.
Innovation Solution
A compact abnormality detector using a flexible sealed body with a fluid and pressure sensor to measure deformation, allowing for accurate detection of abnormalities without the need for multiple sensors across the article's surface, and optionally including a temperature measurement unit and flame-retardant materials to prevent ignition spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are placed on all surfaces of the battery to detect deformation, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
A flexible sealed body containing fluid is introduced as an intermediary between the battery and the pressure sensor. This sealed body deforms in response to battery shape changes and transmits this deformation as pressure changes to the sensor, enabling accurate deformation detection with a single sensor location
Solution Approach 2:
The invention uses a fluid-filled sealed body to convert mechanical deformation into pressure changes. The fluid transmits the deformation forces from the battery surface uniformly to the pressure sensor, allowing detection of distributed deformation through a single measurement point
2Reliability
If a battery monitor with state quantity acquisition and change amount operation is used, then abnormality detection capability is improved, but device size increases
Solution Approach 1:
The invention extracts only the essential detection function from complex battery monitoring systems. Instead of using multiple sensors and complex processing units, it uses a simple pressure sensor combined with a flexible sealed body to directly detect abnormality indicators through pressure changes
Solution Approach 2:
The system detects battery abnormalities by monitoring pressure changes in the sealed body, which change in response to battery deformation. This parameter transformation from mechanical deformation to pressure enables simple and effective abnormality detection
3Area of stationary object
If sensors are placed in contact with all battery surfaces, then measurement coverage is improved, but manufacturing cost increases
Solution Approach 1:
The flexible sealed body serves multiple functions: it conforms to the battery surface to ensure contact, transmits deformation to the sensor, and enables wide-area monitoring. This single component provides what would otherwise require multiple sensors placed at different locations
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
Enables early detection of abnormalities like heat generation in lithium-ion batteries, reducing the risk of accidents by providing a simpler, smaller, and lower-cost solution with improved accuracy and safety features.
Implementation Method 1
a sensor configured to measure a change in pressure of the fluid contained in the sealed body, accompanying deformation of the article
Implementation Method 2
the sealed body having flexibility; and a sensor configured to measure a change in pressure of the fluid contained in the sealed body, accompanying deformation of the article
Data Source
AI summary
Provided is a technique capable of detecting deformation based on an abnormality such as heat generation in an article by a simpler, smaller, or lower-cost configuration, to suppress occurrence of an accident due to the abnormality of the article. An abnormality detector for measuring deformation of a battery B, such as a lithium-ion battery, to detect an abnormality of the battery, the abnormality detector includes: a sealed container disposed in close contact with at least a part of an outer surface of the battery, while containing and sealing a fluid such as water, the sealed container having flexibility; and a pressure sensor configured to measure a change inside the sealed container, accompanying deformation of the battery.