Battery Module Relay Control for Output Short-Circuit Isolation
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Solution Overview
Problem
Existing battery modules fail to adequately prevent the influence of short-circuits between output terminals from reaching the battery cell, despite immediate interruption of detection voltage transmission.
Innovation Solution
A battery module design incorporating a relay and control unit to manage the electrical connection between the electricity storage unit and output terminals, with a constant current circuit for impedance measurement, allowing the relay to be controlled based on output resistance thresholds to maintain a cut-off state when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a signal cut-off unit is disposed between the voltage sensing terminal and the conductive unit to interrupt detection voltage transmission when a short-circuit occurs, then safety is improved by preventing detection voltage short-circuit, but the influence of the short-circuit may still reach the battery cell
Solution Approach 1:
A relay is introduced as an intermediary component between the battery cell and the output terminal. The relay acts as a mediator that can completely disconnect the electrical connection, preventing short-circuit influences from reaching the battery cell. This goes beyond the signal cut-off unit by providing physical isolation rather than just signal interruption.
Solution Approach 2:
The electrical connection is segmented into controllable sections using the relay. The system divides the circuit into the battery cell section and the output terminal section, with the relay serving as a controllable boundary. This segmentation allows independent protection of the battery cell from external short-circuit conditions.
2Object-affected harmful factors
If the relay is controlled to be in the cut-off state when output resistance exceeds a threshold, then the battery cell is protected from short-circuit influences, but the load cannot receive electricity when no load is connected
Solution Approach 1:
The control unit continuously monitors the output resistance and uses this feedback to determine the relay state. When the output resistance exceeds the threshold, the system infers that no load is connected and maintains the relay in the cut-off state to prevent potential short-circuits. When the resistance is below the threshold, the relay is switched to the conductive state to enable electricity supply.
Solution Approach 2:
The system changes the relay's electrical state (conductive or cut-off) based on the output resistance parameter. By monitoring resistance changes, the system dynamically adjusts the relay position to balance between protection and functionality, ensuring the battery cell is protected when idle while allowing normal operation when loaded.
Data Source
AI summary
A battery module is configured to supply electricity to a load connected to an output terminal. The battery module includes: an electricity storage unit; a relay that is provided between the electricity storage unit and the output terminal and configured to perform switching between an electrically conductive state and a cut-off state between the electricity storage unit and the output terminal; and a control unit configured to control a state of the relay. In the battery module, the control unit is configured to control the relay to be in the cut-off state under a condition that an output resistance of the battery module is equal to or more than a first threshold value.