Battery Cell Measuring Jig Layout for Low-Inductance Impedance Tests
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Solution Overview
Problem
Existing impedance measurement methods for rechargeable batteries are distorted by inductance due to the structure or arrangement of measurement equipment components, which affects the accuracy of impedance measurement.
Innovation Solution
A characteristic measuring apparatus with a support and impedance measuring part that includes non-overlapping terminals for current and voltage, minimizing inductance interference by arranging the terminals to be substantially opposite or at acute angles, reducing the magnetic field's impact on impedance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional measurement equipment components (current lines, voltage lines) are arranged in overlapping or parallel configurations, then the device structure is simple and easy to manufacture, but inductance increases causing impedance measurement distortion
Solution Approach 1:
The patent applies asymmetry by arranging current terminals and voltage terminals in non-symmetric positions on the battery cell terminals. Specifically, the current terminals are positioned at the outer edges while voltage terminals are positioned inward, creating an asymmetric layout that minimizes inductance. This asymmetric arrangement breaks the traditional symmetric overlapping configuration, reducing magnetic field interference and improving impedance measurement accuracy without requiring complex additional components.
Solution Approach 2:
The patent transitions from a two-dimensional overlapping arrangement to a multi-dimensional spatial distribution of terminals. By positioning terminals at different locations on the battery cell terminals (outer edges for current, inward positions for voltage) and using three-dimensional lead routing, the patent creates a spatial separation that reduces inductance. This dimensional approach allows current and voltage paths to be separated in space rather than overlapping in the same plane.
2Measurement precision
If current terminals and voltage terminals are arranged overlapping or in parallel, then the lead structure is compact, but inductance increases distorting impedance measurements
Solution Approach 1:
The patent changes the geometric parameters of the terminal arrangement, specifically the positions and orientations of current and voltage terminals. By adjusting these parameters (positioning current terminals at outer edges, voltage terminals inward, and setting specific angles between leads), the patent optimizes the balance between lead length and inductance reduction, achieving accurate impedance measurements.
3Measurement precision
If terminals are arranged to minimize inductance (non-overlapping, opposite positions), then impedance measurement accuracy improves, but the device structure becomes more complex
Solution Approach 1:
The patent segments the terminal functions by clearly separating current terminals and voltage terminals into distinct groups with dedicated positions. Current terminals are positioned at outer edges while voltage terminals are positioned inward, creating functional segmentation that simplifies the manufacturing process. This segmentation allows for standardized assembly procedures where current and voltage connections are made to clearly defined locations, reducing assembly complexity despite the optimized terminal arrangement.
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
The apparatus effectively reduces impedance distortion by minimizing inductance, allowing for accurate impedance measurement of battery cells without significant interference, thereby improving measurement precision.
Implementation Method 1
an impedance measuring part detachable to a terminal side of the battery cell... configured to measure the voltage of the battery cell
Implementation Method 2
configured to elevate the impedance measuring part with respect to the terminal side of the battery cell... minimize or at least reduce the influence of inductance when measuring the impedance
Data Source
AI summary
A characteristic measuring jig includes a support to support a battery cell, an impedance measuring part including first and second positive electrode contact parts, first and second negative electrode contact parts, a first terminal for current connected to the first positive electrode contact part, a first terminal for voltage connected to the second positive electrode contact part, a second terminal for current connected to the first negative electrode contact part, and a second terminal for voltage connected to the second negative electrode contact part that is detachable to the terminal side of the battery cell, and an elevating part fixed to the support, connected to the impedance measuring part, and configured to elevate the impedance measuring part. At least one of the first terminal for current or the second terminal for current is opposite to at least one of the first terminal for voltage or the second terminal for voltage.