Vehicle Battery State Detection Before Relay Power-Off
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Solution Overview
Problem
Existing battery management systems for eco-friendly vehicles cannot effectively determine or alert abnormal battery states when the vehicle is in a no-load state, particularly after the main relay is turned off, and lack preventive measures for severe issues like battery ignition.
Innovation Solution
A system and method that utilize a controller to determine battery states by calculating parameters such as insulation resistance or voltage deviation and comparing them with preset reference values, even when the vehicle is in a power-off state, and alert the driver or external servers accordingly to prevent severe problems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the main relay is turned off and controllers are powered off to save energy, then energy consumption is reduced, but the ability to detect abnormal battery states is lost
Solution Approach 1:
The system performs preliminary battery state detection and parameter calculation before turning off the main relay and controllers. By checking insulation resistance, voltage deviation, and other battery parameters in advance, the system ensures that abnormal states are detected and recorded even though the controllers will be powered off. This preliminary action resolves the contradiction by maintaining detection capability at the critical moment before energy-saving mode activates.
Solution Approach 2:
The patent introduces an intermediary mechanism where the controller calculates and stores battery parameters (such as insulation resistance and voltage deviation) in memory before power-off. These calculated parameters serve as intermediaries that preserve battery state information even when the controller is powered off. The stored parameters can be later transmitted to external devices or used for post-analysis, thus maintaining detection capability without requiring continuous power consumption.
2Object-generated harmful factors
If simple control is performed to block internal current flow when battery abnormality is detected, then current flow is blocked, but severe problems like battery ignition cannot be prevented in advance
Solution Approach 1:
The system performs preliminary assessment of battery abnormality severity by calculating multiple parameters (insulation resistance, voltage deviation, temperature) before taking control actions. By evaluating these parameters in advance and comparing them against threshold values, the system can determine the severity level and take appropriate preventive measures before severe problems occur. This multi-parameter preliminary assessment enables the system to distinguish between minor abnormalities and critical conditions requiring immediate intervention.
Solution Approach 2:
The patent employs multiple battery parameters (insulation resistance, voltage deviation, temperature, current flow) to assess abnormality severity rather than relying on a single parameter. By monitoring changes in these parameters and their relationships, the system can more accurately determine the severity of battery abnormality and take appropriate preventive actions. This multi-parameter approach improves the reliability of preventive capability by providing a more comprehensive view of battery health status.
Data Source
AI summary
A system for managing a battery of a vehicle includes a battery, a main relay connected to the battery to transfer or block power of the battery to components in the vehicle, and a controller. The controller is configured to control the components in the vehicle to be in a power-off (IG OFF) state and turning off the main relay when receiving a vehicle power-off input, and to determine whether or not the battery is abnormal by calculating a parameter for determining a state of the battery and comparing the calculated parameter with a plurality of reference values that are preset.