Battery Management System Parallel Current Path Arc Suppression
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Solution Overview
Problem
Lithium-ion battery cells in motor vehicles can experience hazardous conditions such as short-circuiting due to external events, leading to high currents that may cause the battery to burst or catch fire, especially in electric and hybrid vehicles with high voltage systems.
Innovation Solution
A battery management system that provides a controlled current path between the poles of the battery cell, utilizing a low-impedance second current path to trigger the fuse and prevent light arcs, allowing for controlled short-circuiting and disconnection of the main current path, which can be initiated by a triggering signal from a hazardous situation detection system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuse is integrated into the battery cell to disconnect the voltage source in abnormal situations, then the battery cell is protected against hazardous states, but light arcs can form after fuse triggering which may cause fire or bursting
Solution Approach 1:
A parallel current path with triggering device is introduced as an intermediary mechanism. When activated, this alternative path diverts the current away from the fuse, preventing light arc formation while maintaining the protective disconnection function. The intermediary path acts as a mediator between the hazardous state detection and the fuse triggering, eliminating the harmful light arc effect.
Solution Approach 2:
The solution converts the potentially harmful light arc phenomenon into a beneficial controlled discharge process. By providing a dedicated current path for fuse triggering, the energy that would otherwise create dangerous light arcs is redirected through a controlled route, transforming a harmful effect into a safe protective mechanism.
2Reliability
If a fuse is used to disconnect the voltage source in abnormal situations, then the battery cell is protected, but the uncontrolled triggering of the fuse can lead to light arcs and hazardous situations
Solution Approach 1:
The triggering device is pre-configured in parallel with the fuse, ready to activate first when abnormal conditions are detected. This preliminary action diverts the current through the controlled path before the fuse can trigger uncontrolledly, preventing light arc formation. The system performs the protective action in advance through the triggering mechanism.
Solution Approach 2:
The system transitions from a static fuse-only protection mechanism to a dynamic two-path system. The triggering device can dynamically switch the current flow between the main path and the parallel path based on detected conditions, providing adaptive protection that responds to actual operating states rather than relying solely on passive fuse characteristics.
3Power
If battery cells are connected in series to provide high voltage output, then the required power output is achieved, but the risk of fire or bursting increases in hazardous situations
Solution Approach 1:
The protection mechanism is segmented at the individual cell level rather than at the battery pack level. Each series-connected cell incorporates its own parallel triggering path and fuse, creating independent protection zones. This segmentation ensures that a hazardous condition in one cell does not necessarily affect other cells, localizing the protection and reducing overall system risk.
Solution Approach 2:
The parallel triggering path acts as an intermediary protective layer for each high-voltage cell. When hazardous conditions are detected in any cell, the triggering device activates the alternative current path, mediating the energy dissipation in a controlled manner that prevents fire or bursting while maintaining the high voltage capability of the series connection.
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
This solution effectively prevents battery-related hazards in motor vehicles by enabling controlled fuse triggering and disconnection, thereby preventing fires or explosions in hybrid or electric vehicles during hazardous events.
Implementation Method 1
the battery management system can make available a current path between poles of the at least one battery cell
Data Source
AI summary
The present disclosure relates to a battery management system for at least one battery cell, for example a lithium-ion battery cell, and to a motor vehicle and to a battery system. A battery management system for at least one battery cell is configured in such a way that, in reaction to a triggering signal, said battery management system can make available a current path between poles of the at least one battery cell. In this context, the current path is configured in such a way that by making available the current path a light arc in a fuse of the at least one battery cell after the triggering of the fuse is prevented or ended. This increases the protection against hazards which can arise from a battery cell in hazardous situations for a vehicle.