Battery Short-Circuit Switching for Chatter-Free Waveform Measurement
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Solution Overview
Problem
Existing battery safety test devices using mechanical contact relays suffer from a chattering phenomenon during external short circuit tests, leading to inaccurate measurement and analysis of battery current waveforms due to slow reaction speed and electrical noise.
Innovation Solution
A battery safety test device incorporating an electronic switching element in conjunction with a mechanical switch element, including a voltage sensor, current sensor, and a waveform calculator to accurately measure and analyze battery current and voltage waveforms, eliminating chattering by using an electronic switch element like a thyristor, MOSFET, or IGBT, and a magnetic relay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a mechanical contact relay is used to configure an external short circuit test circuit, then the circuit can be switched on and off, but the reaction speed is slow and chattering phenomenon occurs causing measurement inaccuracy
Solution Approach 1:
The patent replaces the mechanical contact relay with an electronic switching element (such as a transistor or thyristor) that is controlled by a control signal. This substitution eliminates the mechanical moving parts that cause slow reaction speed and chattering, thereby improving both the switching speed and measurement precision of the battery current waveform during external short circuit tests.
2Reliability
If a mechanical contact relay is used for switching, then the circuit can be opened and closed, but electrical noise and chattering occur during contact connection
Solution Approach 1:
The patent substitutes the mechanical contact relay with an electronic switching element that operates without mechanical contact. The electronic switch is controlled by a control signal applied to its control terminal, which eliminates the arcing, chattering, and electrical noise associated with mechanical contact making and breaking, while maintaining reliable circuit switching functionality.
3Measurement precision
If an electronic switching element is added to the circuit, then chattering is eliminated and measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical contact relay with an electronic switching element that has similar functional capabilities but without the drawbacks of mechanical operation. The electronic switch can be integrated into the existing circuit with minimal additional components, eliminating chattering and improving measurement accuracy while adding only moderate complexity compared to the mechanical system it replaces.
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 solution enables precise measurement and analysis of battery current waveforms during external short circuits, eliminating the chattering phenomenon and improving the accuracy of battery safety testing.
Implementation Method 1
the mechanical switch element is a magnetic relay
Data Source
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AI summary
The present invention provides a battery safety test device includes: a mechanical switch element having one end connected to either a battery positive or negative electrode and the other end connected to an electronic switching element; the electronic switching element having one end connected to the mechanical switch element and the other end connected to the other of the battery positive or negative electrode; a voltage sensor configured to measure a voltage of the battery after the mechanical switch element and the electronic switching element are turned on; and a current sensor configured to measure a current of the battery after the mechanical switch element and the electronic switching element are turned on.