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A method and device for powering off a battery management system

A technology of a battery management system and an electrical method, which is applied in the field of power-off methods and devices of the battery management system, and can solve problems such as insufficient cooperation between VCU and BMS, potential safety hazards, etc.

Active Publication Date: 2021-04-23
GEELY AUTOMOBILE INST NINGBO CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the VCU and BMS are not well coordinated during the power-off process, and after the high-voltage relay is disconnected, the large amount of charge in the high-voltage capacitor is a potential safety hazard

Method used

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  • A method and device for powering off a battery management system
  • A method and device for powering off a battery management system
  • A method and device for powering off a battery management system

Examples

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Embodiment 1

[0048] An embodiment of the present invention provides a method for powering off a battery management system, such as figure 1 As shown, the method includes:

[0049] S1. Detecting that the key signal IG1 disappears, the VCU (vehicle controller) judges whether the vehicle has the high-voltage power-off condition, and sends a power-off command;

[0050] S2. Detecting that the key signal IG1 disappears, the BMS (battery management system) waits for the VCU (vehicle controller) to send a power-off command;

[0051] S3. The BMS (battery management system) obtains the power-off command, executes the high-voltage operation and feeds back the status of the high-voltage relay to the VCU (vehicle controller);

[0052] S4. The VCU (vehicle controller) reads the status of the relay, and when it judges that the relay is disconnected, sends a capacitive charge discharge command to the IPU (integrated combined power unit);

[0053] S5. BMS (Battery Management System) performs key data sto...

Embodiment 2

[0065] The embodiment of the present invention proposes a method for detecting a power-off timeout fault when the battery management system is powered off, such as image 3 As shown, the method includes:

[0066] S1. Detecting that the key signal IG1 disappears, the VCU (vehicle controller) judges whether the vehicle has the high-voltage power-off condition, and sends a power-off command;

[0067] S2. Detecting that the key signal IG1 disappears, the BMS (battery management system) waits for the VCU (vehicle controller) to send a power-off command;

[0068] S3. The BMS (battery management system) receives the power-off command and executes the high-voltage operation.

[0069] S4. The BMS (battery management system) judges whether the high-voltage operation is completed within the predetermined time, and if the high-voltage operation is not completed within the predetermined time, it will report a power-off overtime fault.

[0070] Specifically, until the BMS (battery managem...

Embodiment 3

[0075] The embodiment of the present invention proposes a method for detecting the fault that the relay is not disconnected when the battery management system is powered off, such as Figure 4 As shown, the method includes:

[0076] S1. Detecting that the key signal IG1 disappears, the VCU (vehicle controller) judges whether the vehicle has the high-voltage power-off condition, and sends a power-off command;

[0077] S2. Detecting that the key signal IG1 disappears, the BMS (battery management system) waits for the VCU (vehicle controller) to send a power-off command;

[0078] S3. The BMS (battery management system) obtains the power-off command and executes the high-voltage operation;

[0079] S4. The BMS (battery management system) fails to complete the high-voltage power-off operation within the predetermined time, and reports a power-off overtime fault. The high voltage relay is not disconnected;

[0080] S5. The VCU (vehicle controller) reads the status of the relay, j...

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Abstract

The invention relates to the field of electronic appliances, and provides a power-off method and device for a battery management system. The power-off method cooperates with the BMS and the VCU. After the key signal disappears, the VCU issues a high-voltage power-off command to the BMS and obtains feedback information from the BMS. After the VCU analyzes the feedback information, it issues the next step until the entire power-off is completed. It can detect the high-voltage relay adhesion fault and charge discharge fault during the power-off process, and the BMS stores relevant data and completes the low-voltage power-off operation. The power-off method of the battery management system proposed by the present invention, VCU and BMS cooperate with each other, optimize the power-off action of the whole vehicle, not only realize the sequential execution of high-voltage power-off actions, but also have a fault diagnosis function.

Description

technical field [0001] The invention relates to the field of electronic appliances, in particular to a method and device for powering off a battery management system. Background technique [0002] New energy vehicles are an important development direction of the automotive industry at present. A considerable part of new energy vehicles are driven by electricity. Therefore, the battery management system is a core component of new energy vehicles. In different electronic and electrical architectures, The system development of the battery management system is related to the controllability of the system work of the whole vehicle, so the function control that the battery management system can realize is more important. [0003] The existing electric vehicle power-on and power-on control strategy is based on the premise of the existing vehicle power system structure, by collecting driver action signals such as keys and pedals, and through CAN bus, BMS (battery management system) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L3/00B60L58/16
CPCB60L3/0046Y02T10/70
Inventor 丁更新潘福中邬学建吴旭峰高杰赵弋峰马艳杨贵永宋健顾斌张珂潘约安白福永
Owner GEELY AUTOMOBILE INST NINGBO CO LTD
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