Vehicle Battery Management System Dual Power Controller
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Solution Overview
Problem
Existing battery management systems for vehicles fail to prevent overcharge and over-discharge of low-voltage batteries and cannot perform a jumpstart when the battery is discharged below a critical level, as the controller loses power and cannot be reactivated.
Innovation Solution
A battery management system that uses a controller receiving power from both a first connection line between the battery and the relay and a second connection line between the relay and the loads, allowing the controller to be operated by external power and enabling the relay to be turned on/off, even when the battery is discharged, using a reconnection switch to manage power supply and wake-up signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the controller receives power only from the connection line between the battery and the relay, then the power supply structure is simple, but the controller cannot operate when the battery is discharged below a critical level, making it impossible to reactivate the relay or perform a jumpstart
Solution Approach 1:
The patent introduces a second connection line as an intermediary power supply path between the relay and the controller. This mediator allows the controller to receive power from the load side of the relay when the battery is discharged, enabling the controller to remain operational and control the relay even when the battery voltage is below the critical level, thus resolving the contradiction between reliability and complexity
Solution Approach 2:
The power supply to the controller is segmented into two independent paths: the first connection line from the battery side and the second connection line from the relay/load side. This segmentation allows the controller to switch between power sources or receive power from either path independently, ensuring continuous operability while maintaining a relatively simple overall structure
2Reliability
If the relay is turned off to prevent over-discharge of the battery, then battery protection is achieved, but the controller loses power and cannot be reactivated to turn the relay on again
Solution Approach 1:
The second connection line acts as a mediator that provides an alternative power path for the controller when the first connection line power is insufficient. When the relay is turned off and the battery is discharged, the controller can still receive power through the second connection line from the load side, maintaining its ability to control the relay and enabling reactivation without compromising battery protection
Solution Approach 2:
The system changes the power supply parameter (voltage level) by allowing the controller to operate at lower voltages from the second connection line when the battery is discharged. This parameter change enables the controller to remain functional in conditions where it would normally lose power, facilitating relay reactivation while maintaining battery protection through the relay's off state
3Adaptability or versatility
If external power is applied to jumpstart the vehicle, then the vehicle can be started, but existing systems cannot accept external power when the battery is over-discharged due to controller power loss
Solution Approach 1:
The controller is designed with multi-functionality to accept power from multiple sources (first connection line from battery and second connection line from relay/load). This universal power acceptance capability allows the controller to function during both normal operation and jumpstart scenarios, enabling the system to adapt to different power supply conditions while maintaining reliable control
Solution Approach 2:
The power supply configuration is made dynamic by allowing the controller to switch between or combine power from the first and second connection lines. This dynamic adaptability enables the system to respond to varying power conditions, including external power application during jumpstart, while maintaining reliable controller operation and system control
Data Source
AI summary
A battery management system for a vehicle is provided. The system is capable of preventing vehicle malfunction by preventing overcharge and over-discharge of a low-voltage battery by providing a controller that is configured to receive power transmitted from a first connection line and power transmitted from a second connection line. The battery management system includes a relay configured to electrically connect and disconnect power that is supplied from a battery to loads. The system also includes a controller configured to receive a first regular power transmitted through a connection line between the battery and the relay and a second regular power transmitted through a connection line between the relay and the loads. The controller is further configured to turn the relay on and off.