Fault location detection method, fault location detection device, storage battery assembly and motor vehicle

A technology of fault location and detection method, applied in the direction of measuring device, measuring electricity, measuring electrical variables, etc., can solve the problem of life reduction, the specific location of the power failure failure cannot be detected, and the driver or maintenance personnel cannot know the power failure identification. and other problems to achieve the effect of reducing maintenance time and cost

Active Publication Date: 2017-03-15
乐视生态汽车(浙江)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The driver or maintenance personnel cannot know the power failure identification, and there is a risk of electric shock
[0004] (2) The hardware load continues to work under the high-voltage bus, and the service life is reduced
[0005] (3) The power battery continues to supply power, and the service life is reduced
However, it is impossible to detect the specific location of the failure of the power failure, resulting in an increase in maintenance time and cost

Method used

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  • Fault location detection method, fault location detection device, storage battery assembly and motor vehicle
  • Fault location detection method, fault location detection device, storage battery assembly and motor vehicle
  • Fault location detection method, fault location detection device, storage battery assembly and motor vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The fault location detection method described in this embodiment is applied in a vehicle management system, such as figure 2 shown, including the following steps:

[0050] S201: After sending the high power down command, detect whether the switch control module has a power failure failure, the power down power command is used to control each contact switch in the switch control module to be disconnected.

[0051] S202: If the switch control module fails due to power failure, send a control command to start the set load, and send a control command to turn off the set load after a first preset time. Wherein, the set load is one or more of the hardware loads, such as a high-pressure water pump and a high-pressure fan; the first preset time can be determined according to the configuration of the power system, and in principle, the fault location can be ensured as much as possible short.

[0052] S203: Obtain the change value of the terminal voltage of the set load and th...

Embodiment 2

[0058] Figure 4 Taking the failure of a battery string as an example, a schematic flowchart of a fault location detection method is provided, including:

[0059] S401 : After sending the command to turn off the high power, detect whether the switch control module has a power failure failure; after that, perform fault location and go to step S402 .

[0060] S402: At the initial moment T1 of the first preset time, obtain the initial voltage Bat1_Vol(T1) of the first battery string, the initial voltage Bat2_Vol(T1) of the second battery string, the initial voltage Bat3_Vol(T1) of the third battery string, and the bus circuit The initial voltage Bus_Vol(T1), in this step, the above data can be obtained by obtaining the voltage value of the branch circuit connected in series with each battery string through the BMS.

[0061] S403: When the duration t1=0, the VMS sends a control instruction for starting the set load, so as to start the set load.

[0062] S404: Determine whether t...

Embodiment 3

[0077] This embodiment provides another solution for obtaining the change value of the terminal voltage of the set load and the change value of the terminal voltage of each battery string, which specifically includes the following steps:

[0078] S1031: Obtain first voltage-time distribution information of the bus circuit and second voltage-time distribution information of the branch circuit;

[0079] S1032: Determine the first effective voltage value and the initial voltage of the bus circuit at the initial moment of the first preset time according to the first preset sampling frequency and the first voltage-time distribution information; according to the first The preset sampling frequency and the second voltage-time distribution information determine the second effective voltage value and the initial voltage of the branch circuit at the initial moment of the first preset time;

[0080] S1033: Determine a first sampling moment according to the first preset sampling frequency...

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Abstract

The embodiment of the invention provides a fault location detection method, a fault location detection device, a storage battery assembly and a motor vehicle. In the scheme, a set load is started and lasts for a first preset time after a power interruption failure is detected to occur in an on-off control module under a strong electricity disconnecting instruction, a terminal voltage variation value of the set load and a terminal voltage variation value of each battery string are acquired within the first preset time, and if the terminal voltage variation value of a certain battery string is consistent with the terminal voltage variation value of the set load, a contact switch corresponding to the battery string is determined to break down. Under the condition of not additionally increasing any sensor, the location of a sintering or adhesion fault and the like can be determined accurately and quickly by using an existing detection component in a motor vehicle power system, so that the maintenance time and the maintenance cost are greatly reduced.

Description

technical field [0001] The invention relates to the field of storage battery technology, in particular to a fault location detection method, a fault location detection device, a storage battery assembly and a motor vehicle. Background technique [0002] Such as figure 1 Shown is a structural schematic diagram of the power system of an electric vehicle, the battery body 100 includes at least one battery string 1001 and a switch control module 1002 . In the figure, three battery strings 1001 are taken as an example, each battery string 1001 has an independent contact switch 1003 , and three groups of contact switches 1003 together constitute a switch control module 1002 . When the three sets of contact switches 1003 are all closed, each battery string 1001 provides power to the drive motor 104, hardware load (high-voltage accessories) 105, etc. through the bus circuit. When VMS101 (Vehicle Management System, vehicle management system) performs power-off operation on the batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327G01R31/36G05B19/042
CPCG01R31/327G01R31/382G01R31/396G05B19/042
Inventor 窦国伟王英
Owner 乐视生态汽车(浙江)有限公司
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