Secondary Battery Magnetic Transient Measurement for Defect Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing techniques for measuring secondary batteries face issues such as internal state changes during charging or discharging, and difficulty in detecting minute defects.
Innovation Solution
A measurement apparatus and method that applies a predetermined voltage based on the open circuit voltage of the secondary battery, switches between charged and open states, measures the transient response of the external magnetic field, and processes this data to generate internal information using a sensor unit and control unit to detect abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a current is applied to the battery for magnetic field measurement, then the magnetic field can be detected, but the internal state of the battery changes due to charging or discharging
Solution Approach 1:
The patent applies periodic voltage to the battery, switching between application and non-application states. This periodic action allows magnetic field measurement during voltage application while avoiding continuous charging/discharging that would alter the battery's internal state. The transient response measurement during periodic cycles enables detection without sustained state changes.
2Measurement precision
If external voltage with AC voltage is applied to the battery, then magnetic field distribution can be derived, but minute defects in the battery are difficult to detect
Solution Approach 1:
The patent replaces the conventional AC voltage application method with a transient response measurement approach. Instead of using continuous AC voltage to derive magnetic field distribution, the system applies periodic voltage and measures the transient magnetic field response. This substitution enables detection of minute defects through transient characteristics rather than steady-state AC responses.
Solution Approach 2:
The patent changes the measurement parameter from steady-state AC magnetic field distribution to transient response characteristics. By measuring how the magnetic field responds during the transient phase after voltage application, the system can detect subtle anomalies that are not apparent in steady-state measurements, thereby improving minute defect detection capability.
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 stable measurement without charging or discharging, allowing for accurate detection of defects and abnormalities within the battery by measuring magnetic fields uniformly across the battery, improving detection accuracy and reliability.
Implementation Method 1
a measurement unit that measures a transient response of an external magnetic field of the secondary battery when switching from the first state to the second state
Implementation Method 2
a voltage application unit that applies a predetermined voltage that is determined based on an open circuit voltage of the secondary battery, to the secondary battery
Data Source
AI summary
A measurement apparatus (10) is an apparatus that measures a secondary battery (20). The measurement apparatus (10) includes a voltage application unit (140), a switching unit (120), a measurement unit (160), and a processing unit (180). The voltage application unit (140) applies a predetermined voltage determined based on an open circuit voltage of the secondary battery (20), to the secondary battery (20). The switching unit (120) switches between a first state in which the predetermined voltage is applied to the secondary battery (20) and a second state in which the secondary battery is open. The measurement unit (160) measures a transient response of an external magnetic field of the secondary battery (20) when switching the first state to the second state. The processing unit (180) generates information on an inside of the secondary battery (20) by using a measurement result of the measurement unit (160).