High-Frequency Bridge Measurement for Battery Cell Short Detection
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Solution Overview
Problem
During the manufacture of energy cells or battery cells, foreign bodies can become deposited between layers, potentially causing short circuits and rendering cells unusable. Detecting such defects before stacking is crucial to prevent entire battery stacks from becoming unusable.
Innovation Solution
A measurement system utilizing an alternating voltage measuring bridge or self-balancing measuring bridge to rapidly measure the electrical capacitance and ohmic resistance of energy cells, particularly dry monocells, using high-frequency measurements. This system allows for online quality control without slowing down production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional measurement methods are used to detect short circuits in energy cells, then measurement reliability is improved, but production speed decreases
Solution Approach 1:
The patent replaces conventional low-frequency measurement systems with a high-frequency measurement system operating at frequencies between 1 kHz and 100 MHz. This substitution enables rapid measurement of capacitance and resistance values, allowing defective energy cells to be identified without slowing down the production line, thus resolving the contradiction between measurement reliability and production speed
Solution Approach 2:
The patent changes the measurement frequency parameter from conventional low frequencies to high frequencies (1 kHz - 100 MHz). This parameter change allows the measurement system to quickly determine capacitance and resistance values, enabling fast detection of short circuits while maintaining high production speeds, thereby resolving the contradiction between reliable defect detection and manufacturing throughput
2Ease of operation
If direct current measurement is used to determine resistance, then measurement simplicity is improved, but measurement time increases
Solution Approach 1:
The patent substitutes direct current measurement with high-frequency alternating current measurement. This replacement enables simultaneous determination of both capacitance and resistance values through a single measurement process, reducing measurement time while maintaining operational simplicity through automated evaluation of the measured parameters
3Measurement precision
If high measurement currents and voltages are used, then measurement accuracy is improved, but safety risks and power requirements increase
Solution Approach 1:
The patent changes the measurement parameters by using high-frequency alternating currents with reduced amplitude levels. This parameter change allows accurate determination of capacitance and resistance values without requiring high measurement currents and voltages, thereby reducing safety risks for operators and lowering power requirements while maintaining measurement precision
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 system effectively detects short circuits and evaluates the quality of energy cells, preventing defective cells from being stacked and reducing waste, while maintaining high production speed and efficiency.
Implementation Method 1
a measurement system for measuring energy cells, preferably battery cells, in particular dry monocells, having an alternating voltage measuring bridge or a self-balancing measuring bridge (auto-balancing bridge) and being designed to measure the electrical capacitance C and/or the ohmic resistance R of an energy cell by means of a high-frequency measurement
Implementation Method 2
An alternating voltage measuring bridge or self-balancing measuring bridge (auto-balancing bridge) is a measuring circuit in which the current through a reference impedance is varied in comparison to the current through an element or energy cell to be measured until the sum of the two currents is 0
Data Source
AI summary
The invention relates to a measurement system for measuring energy cells, for example battery cells, in particular dry monocells, wherein the measurement system has an alternating voltage measuring bridge or a self-balancing measuring bridge (auto-balancing bridge) and is designed to measure the electrical capacitance (C) and/or the ohmic resistance (R) of an energy cell by means of a high-frequency measurement. The invention further relates to a corresponding method.