Multi-Frequency Battery Impedance Testing via Square Wave Superposition
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Solution Overview
Problem
Current battery impedance testing methods can only obtain impedance values at a single effective frequency point per test, limiting the comprehensive understanding of battery performance.
Innovation Solution
A battery impedance testing system that generates a superposition signal of at least two square wave current signals with different frequencies, allowing for the simultaneous measurement of impedance at multiple frequency points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single frequency excitation current is used, then the testing process is simple, but only one impedance value can be obtained per test
Solution Approach 1:
The patent combines multiple single-frequency excitation signals into a single multi-frequency excitation current. By superimposing at least two square wave current signals with different frequencies, the system obtains multiple impedance values (including real and imaginary parts at different frequencies) in a single test, resolving the contradiction between measurement comprehensiveness and testing complexity
Solution Approach 2:
The excitation current generation circuit is designed to produce multi-frequency square wave signals that can simultaneously excite the battery at multiple frequency points. This universal excitation signal serves multiple measurement functions (obtaining real impedance, imaginary impedance, and frequency response) within a single test framework
2Measurement precision
If multiple frequency points are tested sequentially, then comprehensive impedance data can be obtained, but testing time increases
Solution Approach 1:
The patent merges multiple sequential testing operations into a single parallel test. By applying a multi-frequency excitation current that contains at least two different frequencies simultaneously, the system obtains complete impedance spectrum data (multiple frequency points, real and imaginary parts) in one test operation, dramatically reducing testing time while maintaining comprehensive data collection
Solution Approach 2:
The excitation current is designed to continuously provide multiple frequency components simultaneously rather than switching between frequencies sequentially. This continuous multi-frequency excitation allows the system to gather comprehensive impedance data without the time loss associated with sequential testing transitions
Data Source
AI summary
A chip for testing an impedance of a battery module, can include: at least one current excitation port configured to control an excitation current applied to the battery module; at least one voltage sampling port configured to sample a response voltage generated on the battery module; a control module configured to perform Fourier transform on the excitation current and the response voltage to generate impedance information of the battery module; and where the excitation current is configured as a superposition signal of at least two square wave current signals with different frequencies.