Battery pack failure warning method and vehicle

Abstract

This application provides a battery pack fault early warning method applied to a vehicle. The method includes: acquiring the vibration acceleration of the battery pack; outputting a battery pack bottoming-out fault warning when the vibration acceleration is greater than or equal to a first threshold and less than a second threshold; and outputting a battery pack leakage fault warning when the vibration acceleration is greater than or equal to the second threshold; wherein the first threshold is less than the second threshold. This application achieves the detection and early warning function for battery leakage faults caused by battery pack bottoming-out.

Description

Technical Field

[0001] The present application relates to the field of battery safety technology, and in particular to a battery pack failure warning method and a vehicle. Background Art

[0002] Energy transformation has promoted the rapid development of new energy vehicles, and the replacement of fuel vehicles by electric vehicles has become an unstoppable trend. As an important part of the energy support of electric vehicles, battery packs are often affected by the bottoming of the vehicle, and when the battery pack bottoms out, it often causes battery pack leakage. At present, the existing technology has not proposed relevant early warning technology for battery pack leakage caused by battery pack bottoming. Therefore, how to detect and warn battery leakage caused by battery pack bottoming has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] The embodiments of the present application provide a battery pack failure warning method and a vehicle to solve the warning problem of battery leakage caused by battery pack bottoming.

[0004] In order to solve the above technical problems, this application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a battery pack failure warning method, which is applied to a vehicle, and the method includes:

[0006] Get the vibration acceleration of the battery pack;

[0007] When the vibration acceleration is greater than or equal to the first threshold value and the vibration acceleration is less than the second threshold value, outputting a battery pack bottoming fault warning;

[0008] When the vibration acceleration is greater than or equal to the second threshold, outputting a battery pack leakage fault warning;

[0009] The first threshold is smaller than the second threshold.

[0010] Optionally, obtaining the vibration acceleration of the battery pack includes:

[0011] Acquire a vibration signal of the battery pack collected by a vibration sensor, convert the vibration signal into a voltage signal, and convert the voltage signal into a vibration acceleration signal;

[0012] The vibration acceleration of the battery pack is acquired based on the vibration acceleration signal.

[0013] Optionally, after obtaining the vibration acceleration of the battery pack, the method further includes:

[0014] Acquire a driving speed of a vehicle, a continuous driving time of the vehicle at the driving speed, and a vehicle state of the vehicle;

[0015] When the driving speed is less than or equal to a preset driving speed and the continuous driving time is greater than a preset driving time, controlling the vibration sensor to execute a sleep mode;

[0016] When the driving speed is greater than a preset driving speed and the vehicle state is a preset state, the vibration sensor is controlled to execute a working mode.

[0017] Optionally, when the vibration acceleration is greater than or equal to a first threshold and the vibration acceleration is less than a second threshold, outputting a battery pack bottoming fault warning includes:

[0018] When the vibration sensor executes the working mode and the vibration acceleration is greater than or equal to the first threshold and the vibration acceleration is less than the second threshold, a battery pack bottoming failure warning is output.

[0019] Optionally, when the vibration acceleration is greater than or equal to the second threshold, outputting a battery pack leakage fault warning includes:

[0020] When the vibration sensor executes the working mode and the vibration acceleration is greater than or equal to the second threshold, a battery pack leakage fault warning is output.

[0021] Optionally, the method further comprises:

[0022] The control instrument display screen displays the battery pack bottoming fault warning or the battery pack leakage fault warning.

[0023] Optionally, the method further comprises:

[0024] The battery pack bottoming fault warning or the battery pack leakage fault warning is reported to the backend server of the vehicle.

[0025] In a second aspect, an embodiment of the present application further provides a vehicle, which is configured to execute the method steps as described in any one of the first aspect.

[0026] Optionally, the vehicle includes a vibration sensor and a battery pack management system, the vibration sensor includes a sensing module and a control module, the output end of the vibration sensor is connected to the input end of the control module, and the battery pack management system is connected to the output end of the control module;

[0027] Among them, the sensor module is used to obtain the vibration signal of the battery pack, and convert the vibration signal into a voltage signal and send it to the control module; the control module is used to receive the voltage signal and convert the voltage signal into vibration acceleration and transmit it to the battery pack management system; the battery pack management system is used to output a battery pack leakage fault warning or a battery pack bottoming fault warning of the battery pack based on the vibration acceleration.

[0028] Optionally, the vehicle further includes a gateway and an instrument display screen, wherein the input end of the gateway is connected to the output end of the battery pack management system, and the output end of the gateway is connected to the instrument display screen, and the instrument display screen is used to display a battery pack leakage fault warning or a battery pack bottoming fault warning.

[0029] In the embodiment of the present application, the obtained vibration acceleration value of the battery pack is used to detect and warn the bottoming fault of the battery pack or the leakage fault of the battery pack. In this way, by setting the threshold of the vibration acceleration of the battery pack, including the first threshold and the second threshold, the battery packs in different fault states can be detected, and the warnings can be issued for different faults, which effectively improves the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] Figure 1 This is one of the flow charts of a battery pack failure warning method provided in an embodiment of the present application;

[0032] Figure 2 This is a flowchart of a battery pack failure warning method provided in an embodiment of the present application.

[0033] Figure 3 is a structural schematic diagram of a vehicle provided in an embodiment of the present application;

[0034] Figure 4 This is a schematic diagram of the installation structure of the vibration sensor in the vehicle. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] The present application embodiment provides a battery pack failure warning method. Figure 1 , Figure 1 This is one of the flowcharts of a battery pack failure warning method provided in an embodiment of the present application, the method comprising the following steps:

[0037] Step 101: Obtain the vibration acceleration of the battery pack.

[0038] In a specific step of an embodiment of the present application, the vibration acceleration of the battery pack can be obtained. The vibration acceleration obtained by the battery pack can be measured by a vibration sensor installed on the battery pack, or can be obtained by other devices for measuring vibration signals, and the present application does not limit this. The specific process of obtaining the vibration acceleration can be to obtain the vibration harmonics of the battery pack through a vibration sensor fixed on the battery pack. The sensor converts the vibration harmonics into vibration signals for reception, and converts the vibration signals into voltage signals, and finally converts the voltage signals into vibration acceleration outputs. In this way, the value of the vibration acceleration can be accurately and conveniently obtained, which facilitates the subsequent judgment of the vibration acceleration value to warn of leakage faults in the battery pack.

[0039] It should be understood that the above-mentioned battery pack refers to a device that is loaded on an electric vehicle and can be used as an energy source for the electric vehicle. The on-board power battery pack will continue to be subjected to vibration loads during the driving of the electric vehicle, so the vibration test is an important part of the battery pack reliability test. In the event of reliability failure of the battery pack, especially when some key components or structures fail, such as loosening or breaking, the battery cells or modules will be displaced, shaken or squeezed, which will further cause accelerated damage to related components, leading to leakage or failure of the sampling sensor, and even inducing battery performance degradation, management system failure, power outage or fire and explosion. Therefore, the present application will judge the failure form of the battery pack based on the vibration acceleration of the battery pack, thereby providing early warning of the failure of the battery pack.

[0040] Step 102: when the vibration acceleration is greater than or equal to the first threshold value and the vibration acceleration is less than the second threshold value, outputting a battery pack bottoming fault warning;

[0041] Step 103: When the vibration acceleration is greater than or equal to the second threshold, output a battery pack leakage fault warning.

[0042] The first threshold is smaller than the second threshold.

[0043] In the above steps, the first threshold and the second threshold can be the vibration acceleration values ​​after the battery pack has a bottoming failure and a leakage failure determined in the actual test, and the specific values ​​can be determined by the test designer after the comprehensive test. In the embodiment of the present application, it is possible to detect whether the battery pack has a bottoming failure by judging the vibration acceleration value. When the battery pack bottoming failure exceeds the first threshold but does not reach the second threshold, a battery pack bottoming failure warning occurs. When the bottoming failure level exceeds the second threshold, a battery pack leakage failure warning occurs. In this way, the vibration acceleration of the battery pack is logically judged through the above steps, thereby realizing a fault warning for the battery pack bottoming or battery pack leakage.

[0044] Optionally, obtaining the vibration acceleration of the battery pack includes:

[0045] Acquire a vibration signal of the battery pack collected by a vibration sensor, convert the vibration signal into a voltage signal, and convert the voltage signal into a vibration acceleration signal;

[0046] The vibration acceleration of the battery pack is acquired based on the vibration acceleration signal.

[0047] In a specific embodiment of the present application, a vibration sensor can be installed to obtain the vibration acceleration of the battery pack. The specific conversion process can be that the electric vehicle is affected by the bottoming, which causes the battery pack to bottom out. When the battery pack bottoms out, it will vibrate, thereby generating vibration harmonics. The vibration sensor obtains the vibration harmonic and converts it into a vibration signal, and then converts the vibration signal into a vibration acceleration signal. In the above, the vibration acceleration of the battery pack is obtained, which is convenient for detecting and warning of battery pack failures and improving the safety of the battery pack.

[0048] Optionally, after obtaining the vibration acceleration of the battery pack, the method further includes:

[0049] Acquire a driving speed of a vehicle, a continuous driving time of the vehicle at the driving speed, and a vehicle state of the vehicle;

[0050] When the driving speed is less than or equal to a preset driving speed and the continuous driving time is greater than a preset driving time, controlling the vibration sensor to execute a sleep mode;

[0051] When the driving speed is greater than a preset driving speed and the vehicle state is a preset state, the vibration sensor is controlled to execute a working mode.

[0052] In another specific embodiment of the present application, after obtaining the vibration acceleration of the battery pack, the specific mode of the battery pack can also be detected, so that the vibration sensor can detect and warn the bottoming fault and leakage fault in the working mode. When the vehicle is in a certain state, the vibration sensor is in a dormant mode, which can reduce the power loss of the vibration sensor and improve the performance of the vibration sensor.

[0053] Specifically, first obtain the vehicle's driving speed, the vehicle's continuous driving time at the driving speed, and the vehicle's status. The above three indicators can be used to determine the vehicle's specific driving or pause status. Based on the actual status of the vehicle, determine whether it is necessary to detect the vibration acceleration of the battery pack, thereby determining whether the vibration sensor needs to enter the working mode.

[0054] Optionally, when the vibration acceleration is greater than or equal to a first threshold and the vibration acceleration is less than a second threshold, outputting a battery pack bottoming fault warning includes:

[0055] When the vibration sensor executes the working mode and the vibration acceleration is greater than or equal to the first threshold and the vibration acceleration is less than the second threshold, a battery pack bottoming failure warning is output.

[0056] Optionally, when the vibration acceleration is greater than or equal to the second threshold, outputting a battery pack leakage fault warning includes:

[0057] When the vibration sensor executes the working mode and the vibration acceleration is greater than or equal to the second threshold, a battery pack leakage fault warning is output.

[0058] Based on the above embodiment, when the vibration sensor is in the working mode, it will judge and compare the vibration acceleration it obtains. This can reduce the power loss of the vibration sensor, improve the performance of the vibration sensor, and timely detect the bottoming fault of the battery pack or the leakage fault of the battery pack.

[0059] Optionally, the method further comprises:

[0060] The control instrument display screen displays the battery pack bottoming fault warning or the battery pack leakage fault warning.

[0061] Optionally, the method further comprises:

[0062] The battery pack bottoming fault warning or the battery pack leakage fault warning is reported to the backend server of the vehicle.

[0063] It is worth mentioning that the obtained battery pack bottoming fault warning or battery pack Louye fault warning can also be displayed on the display screen and conveyed to the user in time, so that the user can check the relevant faults, eliminate the faults in time, and improve the safety performance of the vehicle.

[0064] See also Figure 2 In a specific embodiment of the present application, the following steps are included:

[0065] Step 111: acquiring a vibration signal of the battery pack collected by a vibration sensor, converting the vibration signal into a voltage signal, and converting the voltage signal into a vibration acceleration signal;

[0066] Step 112: acquiring the vibration acceleration of the battery pack based on the vibration acceleration signal;

[0067] Step 113: Acquire the driving speed of the vehicle, the continuous driving time of the vehicle at the driving speed, and the vehicle state of the vehicle;

[0068] Step 114, determining whether the driving speed is greater than a preset driving speed;

[0069] Step 115: When the driving speed is less than or equal to a preset driving speed and the continuous driving time is greater than a preset driving time, control the vibration sensor to execute a sleep mode;

[0070] Step 116: When the driving speed is greater than a preset driving speed and the vehicle state is a preset state, control the vibration sensor to execute a working mode;

[0071] Step 117: determine whether the vibration acceleration is greater than or equal to a second threshold;

[0072] Step 118: when the acceleration is less than the second threshold, determine that the vibration acceleration is greater than or equal to the first threshold; Step 119: when the vibration acceleration is greater than or equal to the first threshold, output a battery pack leakage fault warning;

[0073] Step 120, the control instrument display screen displays a battery pack bottom support failure warning;

[0074] Step 121, reporting the battery pack bottoming failure warning to the vehicle's backend server;

[0075] Step 122: when the vibration acceleration is greater than or equal to the second threshold, output a battery pack leakage fault warning;

[0076] Step 123, the control instrument display screen displays a battery pack leakage fault warning;

[0077] Step 124: Report the battery pack leakage fault warning to the vehicle's backend server.

[0078] For the second aspect, please see Figure 2 , an embodiment of the present application also provides a vehicle, which is configured to perform the method steps as described in any one of the first aspects.

[0079] Optionally, the vehicle includes a vibration sensor 201 and a battery pack management system 202, the vibration sensor 201 includes a sensing module 2011 and a control module 2012, the output end of the vibration sensor 201 is connected to the input end of the control module 2012, and the battery pack management system 202 is connected to the output end of the control module 2012;

[0080] Among them, the sensor module 2011 is used to obtain the vibration signal of the battery pack, and convert the vibration signal into a voltage signal and send it to the control module 2012. The control module 2012 is used to receive the voltage signal and convert the voltage signal into vibration acceleration and transmit it to the battery pack management system 202. The battery pack management system 202 is used to output a battery pack leakage fault warning or a battery pack bottoming fault warning of the battery pack based on the vibration acceleration.

[0081] See also Figure 3 In another embodiment of the present application, a vehicle can also be designed. The vehicle is equipped with a battery pack, and the vehicle can execute a battery pack failure warning method in the above embodiment. The vehicle can achieve all the beneficial effects in the above embodiment, and the details will not be repeated here.

[0082] It should be noted that the vibration sensor 201 in the present application includes two parts: a sensor module 2011 and a control module 2012. The sensor module 2011, as an execution structure, can receive and convert the vibration harmonics of the battery pack into a voltage signal. The control module 2012 converts the voltage signal into a vibration acceleration signal and transmits it to the battery pack management system connected to the vibration sensor 201. The battery pack management system 202 can determine the relationship between the vibration acceleration value and the first threshold and the second threshold, so as to determine and warn of a bottoming failure of the battery pack or a leakage failure of the battery pack.

[0083] Optionally, the vehicle further includes a gateway 203 and an instrument display screen 204, wherein the input end of the gateway 203 is connected to the output end of the battery pack management system 202, and the output end of the gateway 203 is connected to the instrument display screen 204, and the instrument display screen 204 is used to display a battery pack leakage fault warning or a battery pack bottoming fault warning.

[0084] Specifically, a gateway 203 and an instrument display screen 204 may also be provided. The gateway 203 is used to connect various devices to transmit data signals. The instrument display screen 204 is connected to the output end of the gateway 203 to receive information from the gateway 203 to display battery pack leakage fault warning information or battery pack bottoming fault warning information.

[0085] See also Figure 4 , the embodiment of the present application also discloses a schematic diagram of the installation structure of the vibration sensor in the vehicle, the vibration sensor 201 is installed on the battery pack, and the installed battery pack also includes some related components: 301 is the upper cover plate, 302 is the bottom guard plate, 303 is the front side beam, 304 is the front longitudinal beam, 305 is the mounting bracket, and 306 is the mounting bolt. Specifically, the force on the bottom of the battery pack transmits the vibration harmonics to the front side beam 303 through the bottom guard plate 302, and the front side beam 303 then transmits the vibration harmonics to the front longitudinal beam 304. Finally, the front longitudinal beam 304 transmits the vibration harmonics to the vibration sensor 201, and the vibration sensor 201 converts the vibration signal into an electrical signal and sends it out. In this way, the vibration sensor 201 can directly convert the vibration harmonics on the battery pack into a vibration signal to obtain vibration acceleration, which is convenient for detecting and warning of battery pack failures and improving the safety of the battery pack in the vehicle.

[0086] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A battery pack failure early warning method, applied to a vehicle, characterized in that: include: Get the vibration acceleration of the battery pack; exist When the vibration acceleration is greater than or equal to the first threshold and the vibration acceleration is less than the second threshold, a battery pack bottoming fault warning is output; exist When the vibration acceleration is greater than or equal to the second threshold, outputting a battery pack leakage fault warning; wherein the first threshold is less than the second threshold; The obtaining of the vibration acceleration of the battery pack includes: Acquire a vibration signal of the battery pack collected by a vibration sensor, convert the vibration signal into a voltage signal, and convert the voltage signal into a vibration acceleration signal, wherein the vibration signal is a signal converted from vibration harmonics generated when the battery pack is supported by the bottom vibration; Acquire the vibration acceleration of the battery pack based on the vibration acceleration signal; After obtaining the vibration acceleration of the battery pack, the method further includes: Obtaining a driving speed of a vehicle and a vehicle state of the vehicle; When the driving speed is greater than a preset driving speed and the vehicle state is a preset state, the vibration sensor is controlled to execute a working mode.

2. The method according to claim 1, characterized in that: After obtaining the vibration acceleration of the battery pack, the method further includes: Obtaining the continuous driving time of the vehicle at the driving speed; When the driving speed is less than or equal to a preset driving speed and the continuous driving time is greater than a preset driving time, the vibration sensor is controlled to execute a sleep mode.

3. The method according to claim 2, characterized in that The outputting of a battery pack bottoming fault warning when the vibration acceleration is greater than or equal to a first threshold and the vibration acceleration is less than a second threshold includes: When the vibration sensor executes the working mode and the vibration acceleration is greater than or equal to the first threshold and the vibration acceleration is less than the second threshold, a battery pack bottoming failure warning is output.

4. The method according to claim 2, characterized in that: When the vibration acceleration is greater than or equal to the second threshold, outputting a battery pack leakage fault warning includes: When the vibration sensor executes the working mode and the vibration acceleration is greater than or equal to the second threshold, a battery pack leakage fault warning is output.

5. The method according to claim 1, characterized in that The method further comprises: The control instrument display screen displays the battery pack bottoming fault warning or the battery pack leakage fault warning.

6. The method according to claim 1, characterized in that The method further comprises: The battery pack bottoming fault warning or the battery pack leakage fault warning is reported to the backend server of the vehicle.

7. A vehicle, characterized in that: The vehicle is configured to execute a battery pack failure warning method as described in any one of claims 1 to 6.

8. The vehicle according to claim 7, characterized in that It includes a vibration sensor and a battery pack management system, wherein the vibration sensor includes a sensing module and a control module, the output end of the sensing module is connected to the input end of the control module, and the battery pack management system is connected to the output end of the control module; Among them, the sensor module is used to obtain the vibration signal of the battery pack, and convert the vibration signal into a voltage signal and send it to the control module; the control module is used to receive the voltage signal and convert the voltage signal into vibration acceleration and transmit it to the battery pack management system; the battery pack management system is used to output a battery pack leakage fault warning or a battery pack bottoming fault warning of the battery pack based on the vibration acceleration.

9. The vehicle according to claim 8, characterized in that It also includes a gateway and an instrument display screen, wherein the input end of the gateway is connected to the output end of the battery pack management system, and the output end of the gateway is connected to the instrument display screen, and the instrument display screen is used to display a battery pack leakage fault warning or a battery pack bottoming fault warning.

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