Switch Protection Device for Battery Management Systems
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Solution Overview
Problem
Mechanical switches in battery management systems face contact ablation due to inrush currents when turned on and electric arcs when turned off, leading to increased contact resistance and reduced service life.
Innovation Solution
A protective device comprising an electronic switch, a mechanical switch, and a time logic circuit, where the electronic switch is controlled to turn on after the mechanical switch, and turn off before it, avoiding inrush currents and electric arcs by using a time logic circuit to manage the switching sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical switch is used to control charging and discharging of a battery, then electrical isolation can be achieved, but contact ablation occurs due to inrush current and electric arc leading to reduced service life
Solution Approach 1:
The electronic switch is turned on before the mechanical switch to establish a current path, and turned off after the mechanical switch to maintain current flow. This preliminary and follow-up action prevents inrush current and electric arc at the mechanical switch contacts, eliminating contact ablation and extending service life.
Solution Approach 2:
The electronic switch acts as an intermediary device that handles the harmful inrush current and electric arc effects, protecting the mechanical switch from direct exposure to these damaging phenomena. The control circuit coordinates both switches to ensure the electronic switch absorbs the harmful effects while the mechanical switch performs its isolation function.
2Object-affected harmful factors
If the electronic switch is turned on before the mechanical switch, then inrush current is avoided, but the control complexity increases
Solution Approach 1:
The control circuit uses feedback signals from both the electronic switch and mechanical switch states to coordinate their operation. This feedback mechanism automatically manages the switching sequence, turning on the electronic switch first and turning it off after the mechanical switch, thereby avoiding inrush current while keeping the control system manageable through automated state monitoring.
Data Source
AI summary
The present disclosure provides a protective device related to the field of battery technology. The protective device includes an electronic switch, a mechanical switch and a time logic circuit. A first output terminal of the time logic circuit is connected to the electronic switch; a second output terminal of the time logic circuit is connected to the mechanical switch; an input terminal of the time logic circuit is connected to an output terminal of a power supply; and the electronic switch is connected in series with the mechanical switch into a circuit under control. The protective device provided in the present disclosure can effectively reduce the damage of the mechanical switch and extend the service life of the mechanical switch.