Battery Management Switching Sequence for No-Load Fault Isolation
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Solution Overview
Problem
Existing battery management systems face performance degradation due to the opening of DC contactors under load, leading to potential damage when an abnormal state is detected, necessitating a more controlled and safe mechanism for managing battery operations.
Innovation Solution
A battery management device and system that includes detection circuits to identify abnormal states, controlling load break switches and DC contactors to open in a no-load state, with advance notification to power management systems, ensuring safe and efficient battery operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DC contactor is opened during abnormal state detection, then protection operation is performed, but performance degradation occurs due to opening under load
Solution Approach 1:
The load break switch is opened before opening the DC contactor to ensure the contactor operates in a no-load state. This preliminary action prevents performance degradation while maintaining protection functionality by sequencing the opening operations correctly.
Solution Approach 2:
The protection operation is divided into two sequential steps: first opening the load break switch to remove load, then opening the DC contactor. This segmentation allows each component to perform its function optimally without the harmful effect of opening under load.
2Reliability
If DC contactor is opened under load, then protection operation is performed, but damage may occur to battery and power conversion device
Solution Approach 1:
The load break switch is opened as a preliminary step before opening the DC contactor, ensuring that the contactor operates in a no-load state. This prevents damage to the battery and power conversion device while maintaining the protection operation's effectiveness.
Solution Approach 2:
The system prepares for potential damage by implementing a load removal mechanism (load break switch) that operates before the main protection action (DC contactor opening). This cushioning approach prevents harmful effects from occurring in the first place.
3Power
If load break switch is opened before DC contactor, then no-load state is achieved, but additional control complexity is required
Solution Approach 1:
The control system is segmented into two distinct switching operations: load break switch control and DC contactor control. This segmentation, while adding a component, simplifies the control logic by clearly defining the sequence and function of each switch, making the overall system more manageable despite the additional element.
Data Source
AI summary
A battery management device includes: a detection circuit to detect state information indicating a state of a battery; and a control circuit to monitor the state of the battery based on the state information detected via the detection circuit, and control a function associated with the battery based on a result of the monitoring. The control circuit is further to open a load break switch electrically connected between the battery and a power conversion device in response to detecting that the battery is in an abnormal state during charging or discharging of the battery.