High-Voltage Battery Control Device Abnormality Detection
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Solution Overview
Problem
Existing power-supply control systems for electric vehicles face issues with preventing breakdowns in loads due to abnormalities in the high-voltage battery during the initial supply of power, which can lead to damage and inefficiency.
Innovation Solution
A power-supply control device with a voltage conversion unit, opening and closing units, and a battery control unit that detects abnormalities in the battery before initiating power supply to loads, ensuring safe and stable operation by controlling the power paths and using secondary power sources to prevent load breakdowns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the high-voltage battery is directly connected to the DC-DC converter without interposing a relay, then the low-voltage battery can be charged even if it has run out, but the risk of load breakdown due to battery abnormalities increases
Solution Approach 1:
The control device detects battery abnormalities before initiating power supply to the DC-DC converter. By performing preliminary detection and preventing power supply when abnormalities are detected, the system avoids load breakdown while maintaining the ability to charge the low-voltage battery under normal conditions.
Solution Approach 2:
The control device acts as an intermediary between the high-voltage battery and the DC-DC converter. It monitors battery status and controls the power supply path, enabling charging when normal and blocking protection when abnormalities occur, thus resolving the contradiction between ease of operation and reliability.
2Device complexity
If the voltage of the high-voltage battery is not monitored before power supply, then the system is simpler, but voltage abnormalities can cause load breakdown
Solution Approach 1:
The control device performs preliminary detection of battery voltage and abnormalities before initiating power supply to the DC-DC converter. This preliminary action prevents load breakdown from voltage abnormalities while maintaining relatively simple system structure through integrated control functionality.
3Speed
If power supply is initiated without abnormality detection, then the system responds faster, but load breakdown may occur due to undetected battery abnormalities
Solution Approach 1:
The control device performs rapid preliminary detection of battery abnormalities immediately before power supply initiation. This streamlined detection process maintains fast response time while ensuring reliability by preventing power supply when abnormalities are detected.
Solution Approach 2:
The control device quickly assesses battery status and either permits immediate power supply or blocks it when abnormalities are detected. This rapid assessment approach maintains fast response time while preventing load breakdown through efficient abnormality detection and protection logic.
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
The solution effectively prevents load breakdowns by confirming battery normalcy before power distribution, ensuring stable operation and prolonging battery life by managing power sources and reducing charge variations.
Implementation Method 1
a voltage conversion unit that steps down a voltage at a battery to supply the stepped-down voltage to a first load
Data Source
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AI summary
A breakdown of a load caused by abnormality of a high-voltage battery is prevented in starting supply of power from the high-voltage battery (111) to each load. In starting the supply of the power from the high-voltage battery (111) to a DC-DC converter (112) and a high-voltage load (102), a high-voltage battery control ECU (114) detects the abnormality of the high-voltage battery in a state in which relays RY1a and RY1b are opened while relays RY2a and RY2b are closed. The high-voltage battery control ECU (114) closes the relays RY1a and RY1b and opens the relays RY2a and RY2b when the abnormality is not detected. The high-voltage battery control ECU continuously opens the relays RY1a and RY1 b when the abnormality is detected. For example, the invention can be applied to a power-supply control system of an electric-powered vehicle.