EV Battery Protection Circuit Fault Detection via CAN Control
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Solution Overview
Problem
Existing electric vehicles face challenges in effectively protecting the battery due to failures in the detection system of the relay circuit, which can lead to inadequate control over the working equipment, potentially compromising battery safety.
Innovation Solution
The electric vehicle is equipped with a first and third protection circuit on the power supply lines, along with detection sections that monitor their states, and a battery management system that communicates error signals to a vehicle control section via CAN transmission, enabling proactive control to prevent power supply failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple protection circuits and detection sections are added to ensure battery safety, then the battery protection capability is improved, but the device complexity increases
Solution Approach 1:
The control section is designed with multi-functionality, serving both as the central control unit for working equipment operation and as the ultimate safety decision-maker for battery protection. By consolidating control functions in a single intelligent unit that receives inputs from multiple detection points, the system achieves comprehensive protection without proportionally increasing overall system complexity.
Solution Approach 2:
The protection system is segmented into functionally independent modules: a first protection circuit for the power supply line to the mounted object, a second protection circuit for the power supply line from the battery, and separate detection sections for each. This modular segmentation allows each component to be optimized independently while maintaining overall system manageability and reliability.
2Reliability
If the control section makes final decisions on working equipment operation based on detection results, then the battery protection is improved, but the response time may be increased due to additional processing
Solution Approach 1:
The control section stores control programs and decision-making logic in advance, enabling it to quickly process detection results and make immediate decisions when abnormalities are detected. By having pre-programmed response protocols ready, the system minimizes decision-making time while maintaining thorough safety evaluation, reducing the time loss associated with complex real-time processing.
Data Source
AI summary
An electric vehicle including: a battery; a first power supply line that supplies the power from the battery to a mounted object; a first protection circuit that is capable of supplying and cutting off the power via the first power supply line by closing or opening; a third power supply line that supplies the power from a quick charger placed outside the vehicle body to the battery, a third protection circuit that is capable of supplying and cutting off the power via the third power supply line by closing or opening; a first detection section that detects a state of the first protection circuit; a third detection section that detects a state of the third protection circuit; and a battery management section that executes, control transmission of an error signal of the first detection section and/or an error signal of the third detection section to a vehicle control section.