Battery Protection Circuit for Engine Starting Current Limiting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
During engine starting events in vehicles or vessels, the primary battery is often over-discharged, leading to potential damage and safety hazards due to excessive current demand, while disconnecting it to prevent this results in power interruptions to on-board accessories.
Innovation Solution
A battery protection circuit system that includes a first relay connecting the primary battery to the starter motor, a second relay and current-limiting circuit in parallel connecting a secondary battery to the starter motor and accessories, and a controller sending control signals to manage the relays during engine start events to prevent over-discharge and maintain power continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the primary battery is directly connected to the starter motor during engine starting events, then the starter motor receives sufficient current to crank the engine, but the primary battery becomes over-discharged leading to potential damage and safety hazards
Solution Approach 1:
A current-limiting circuit is introduced as an intermediary component between the primary battery and the starter motor. This circuit actively monitors and limits the maximum current drawn from the battery during engine starting events, preventing over-discharge while still providing sufficient current for motor operation. The mediator component (current-limiting circuit) resolves the contradiction by decoupling the direct connection and inserting protective functionality.
2Reliability
If the primary battery is disconnected from the starter motor to prevent over-discharge, then battery safety is improved, but power supply to on-board accessories is interrupted
Solution Approach 1:
The electrical system is segmented into separate circuits: one path for the starter motor through the current-limiting circuit, and another independent path for on-board accessories through a protection relay. This segmentation allows the battery to be protected from over-discharge during motor operation while maintaining continuous power supply to accessories. The segmentation principle resolves the contradiction by creating independent operational paths that can be controlled separately.
Solution Approach 2:
The system dynamically adjusts circuit connectivity based on operational conditions. During engine starting events, the current-limiting circuit activates to protect the battery while maintaining accessory power. The dynamic control through relays and protection circuits allows the system to adapt its configuration in real-time, resolving the contradiction between protection and continuity by making the connection state conditional rather than fixed.
3Reliability
If a protection circuit is added to the battery system, then battery safety and over-discharge protection are improved, but the device complexity increases
Solution Approach 1:
Multiple protection functions (current limiting, over-discharge protection, accessory power management) are merged into a single integrated protection circuit architecture. The current-limiting circuit and protection relay work together as a unified system rather than separate independent components. This merging reduces overall system complexity while maintaining comprehensive protection capabilities, as the combined circuit handles multiple functions through coordinated operation of its components.
Data Source
AI summary
The disclosure is directed to systems and methods for providing a battery protection circuit during an engine starting event on a vessel. The system includes a first relay, wherein the first relay electrically connects between: a first battery, and a starter motor and a set of on-board accessories, the starter motor mechanically associated with an engine; a battery protection circuit, wherein the battery protection circuit comprises a second relay and a current-limiting circuit in parallel, and electrically connects between: a second battery, and the starter motor and the set of on-board accessories; and a controller, wherein upon receiving a signal to start the engine, the controller is configured to send a first control signal to the first relay and a second control signal to the second relay.