Battery Short-Circuit Test Switching for Chatter-Free Waveforms
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mechanical contact relays in external short circuit test circuits for lithium ion batteries suffer from slow reaction speed and electrical noise, causing chattering phenomena that distort current waveforms and hinder accurate safety analysis.
Innovation Solution
A battery safety test device employing an electronic switching element in conjunction with a mechanical switch element, utilizing a voltage sensor and current sensor to measure and analyze waveforms, and a gate circuit to drive the electronic switch, which includes a thyristor, MOSFET, or IGBT, to eliminate chattering and provide accurate measurements.
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 MOSFET or IGBT) that is driven by a gate circuit. This substitution eliminates the mechanical moving parts that cause slow reaction speed and chattering, thereby improving both the switching speed and the accuracy of current waveform measurements during external short circuit tests.
Solution Approach 2:
The patent introduces a gate circuit as an intermediary between the control signal and the electronic switching element. The gate circuit properly drives the electronic switching element to ensure rapid and clean switching without chattering, thus resolving the contradiction between switching speed and measurement precision.
2Reliability
If a mechanical contact relay is used, then the circuit switching function is achieved, but electrical noise and chattering occur distorting the current waveform
Solution Approach 1:
The patent replaces the mechanical contact relay with an electronic switching element (such as MOSFET or IGBT) that is driven by a gate circuit. This substitution eliminates the mechanical moving parts that cause slow reaction speed and chattering, thereby improving both the switching speed and the accuracy of current waveform measurements during external short circuit tests.
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 introduces a gate circuit as an intermediary between the control signal and the electronic switching element. The gate circuit properly drives the electronic switching element to ensure rapid and clean switching without chattering, thus resolving the contradiction between switching speed and 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 solution effectively eliminates chattering, allowing for precise measurement and analysis of battery current waveforms during external short circuits, enhancing the accuracy of battery safety tests.
Implementation Method 1
the mechanical switch element is a magnetic relay
Data Source
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 for measuring a voltage of the battery after the mechanical switch element and the electronic switching element are turned on; and a current sensor for measuring a current of the battery after the mechanical switch element and the electronic switching element are turned on.