Battery Current Distribution Detection Without Canceling Coil
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery testing methods, such as those disclosed in JP 2013-054984 A, fail to accurately detect current distribution in a single measurement and require the use of a canceling coil to cancel magnetic noise, making the process complicated and cumbersome.
Innovation Solution
A battery testing method that measures magnetism when applying an electric current to a test target battery, obtains the current distribution, and compares it with a normal current distribution, eliminating the need for a canceling coil and its control preparation, by using a magnetic material at a predetermined position inside the battery case to establish a reference position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a canceling coil is used to cancel magnetic noise, then magnetic measurement accuracy is improved, but device complexity and operation difficulty increase
Solution Approach 1:
The patent extracts and removes the canceling coil component from the testing apparatus. Instead of using active cancellation, the invention relies on passive magnetic shielding materials and natural magnetic field decay, thereby eliminating the complex coil system while maintaining measurement capability
Solution Approach 2:
The patent converts the harmful magnetic noise into a beneficial reference signal. By measuring the magnetic field before current application (which contains only background noise) and using it as a reference, the system can subtract this reference from the measurement during current application, effectively canceling noise without requiring active cancellation coils
2Measurement precision
If a canceling coil is used to cancel magnetic noise, then magnetic measurement accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The patent performs preliminary measurement of the background magnetic field before applying current to the battery. This pre-measured background field is stored as reference data and used for subtraction from the actual measurement, eliminating the need for complex real-time cancellation control during operation
Solution Approach 2:
The system uses its own background measurement to cancel its own noise interference. The magnetic field measurement taken before current application serves as the reference for canceling noise during current application, making the system self-sufficient without requiring external cancellation devices or complex control algorithms
3Productivity
If magnetic noise cancellation is performed in a single measurement, then measurement efficiency is improved, but measurement precision deteriorates
Solution Approach 1:
The patent employs periodic measurement cycles: first measuring the background magnetic field without current, then applying current and measuring again, and finally subtracting the first measurement from the second. This periodic approach allows noise cancellation to be achieved within a single testing sequence, maintaining both speed and accuracy
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 method simplifies the process of obtaining and comparing current distributions, allowing for easier detection of abnormalities in batteries without the need for additional hardware, thereby improving the accuracy and efficiency of battery testing.
Implementation Method 1
measuring magnetism when applying an electric current to the test target battery
Data Source
AI summary
A method of testing a battery includes the following steps. Step A1 is a step of preparing a test target battery. Step A2 is a step of measuring magnetism when applying an electric current to the test target battery. Step A3 is a step of obtaining a current distribution of the test target battery based on the magnetism measured in step A2. Step A4 is a step of comparing the current distribution of the test target battery obtained in step A3 with a normal current distribution that is obtained in advance, with predetermined reference positions being aligned with each other.