Damage detection device and vehicle

Abstract

The utility model provides a damage detection device and a vehicle, the damage detection device is arranged at the bottom of a battery bottom protection plate, the damage detection device comprises an isolation module, a loop detection module and an anti-collision module which are stacked, the isolation module is arranged between the bottom of the battery bottom protection plate and the loop detection module, and the loop detection module is connected with a battery management system. Through the above damage detection device, the damage of the battery pack box body at the bottom of the new energy automobile is detected, so that the safety performance of the new energy automobile is improved.

Description

Technical Field

[0001] This application relates to the technical field of vehicles, and particularly to a damage detection device and a vehicle. Background Art

[0002] Existing electric new energy vehicles use battery packs as power sources, and almost all battery packs are arranged under the chassis of electric new energy vehicles. During the driving process of the vehicle, the bottom of the battery pack is extremely vulnerable to being scratched by protrusions. After being scratched, it may cause the sealing of the battery pack to fail, and even cause the battery pack to catch fire.

[0003] When the bottom scratch only causes slight damage to the battery pack housing, the voltage, temperature, insulation, etc. of the battery pack do not show abnormalities. In this case, the electric new energy vehicle may continue to be used, but the battery pack housing is very likely to have its sealing fail due to the scratch, resulting in water ingress into the battery pack when the electric new energy vehicle wades again, triggering serious accidents such as insulation and thermal runaway. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a damage detection device and a vehicle, which can detect the damage of the battery pack housing at the bottom of a new energy vehicle through the damage detection device, so as to improve the safety performance of the new energy vehicle.

[0005] In a first aspect, an embodiment of this application provides a damage detection device, which is arranged at the bottom of a battery bottom guard. The damage detection device includes an isolation module, a circuit detection module, and an anti-impact module that are stacked. The isolation module is arranged between the bottom of the battery bottom guard and the circuit detection module, and the circuit detection module is connected to a battery management system.

[0006] In an optional embodiment of this application, the isolation module includes an insulating isolation board covering the bottom of the battery bottom guard, and the size of the board surface of the insulating isolation board is the same as the area size of the bottom of the battery bottom guard.

[0007] In an optional embodiment of this application, the insulating isolation board is covered with insulating paint.

[0008] In an optional embodiment of this application, the circuit detection module includes copper foil. The input end of the copper foil is connected to the output end of the battery management system, and the output end of the copper foil is connected to the input end of the battery management system.

[0009] In an optional embodiment of this application, the copper foil is distributed in a serpentine shape, and the area size of the serpentine distribution is the same as the area size of the bottom of the battery bottom guard.

[0010] In an alternative embodiment of the present application, the circuit detection module further includes connection terminals respectively connected to both ends of the copper foil, one of the connection terminals is connected to the output end of the battery management system, and the other connection terminal is connected to the input end of the battery management system.

[0011] In an alternative embodiment of the present application, the anti-collision module includes chassis armor paint, and the size of the paint surface of the chassis armor paint is consistent with the area size of the bottom of the battery bottom guard plate.

[0012] In an alternative embodiment of the present application, the chassis armor paint includes PVC glue, and the spraying thickness of the PVC glue is more than five times the thickness of the copper foil in the circuit detection module.

[0013] In a second aspect, an embodiment of the present application further provides a vehicle, including a battery system, and a battery bottom guard plate carrying the battery system. The bottom of the battery bottom guard plate is provided with the damage detection device as described above, and the circuit detection device in the damage detection device is connected to the battery management unit in the battery system.

[0014] In an alternative embodiment of the present application, the vehicle further includes a fault prompt device, and the fault prompt device is connected to the battery management unit.

[0015] The embodiment of the present application provides a damage detection device and a vehicle. The damage detection device is arranged at the bottom of the battery bottom guard plate. The damage detection device includes a stacked isolation module, a circuit detection module, and an anti-collision module. The isolation module is arranged between the bottom of the battery bottom guard plate and the circuit detection module. The circuit detection module is connected to the battery management system. The battery management system is used to detect the conduction state of the circuit detection module. When the bottom of the battery bottom guard plate is scratched, the circuit detection module is damaged due to the impact. At this time, the circuit of the battery management system is disconnected to output the result that the bottom of the battery bottom guard plate has been scratched, so that the user can give an early warning in time and maintain the battery bottom guard plate, etc. Furthermore, through the damage detection device, the detection of the damage of the battery pack box at the bottom of the new energy vehicle can be realized to improve the safety performance of the new energy vehicle.

[0016] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. Description of the Drawings

[0017] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0018] Figure 1 This is a schematic structural diagram of a damage detection device provided by an embodiment of the present application;

[0019] Figure 2 This is a schematic structural diagram of a copper foil provided by an embodiment of the present application.

[0020] Reference numerals: 100 - battery system; 101 - battery bottom guard plate; 200 - isolation module; 300 - loop detection module; 400 - anti-impact module. Detailed implementation manners

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all of them. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0022] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0023] In the description of the embodiments of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "provided with", "installed", "communicated with", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] Existing electric new energy vehicles use battery packs as power sources. Almost all battery packs are arranged under the chassis of electric new energy vehicles. During the driving process of the vehicle, the bottom of the battery pack is extremely vulnerable to being scratched by protrusions. After being scratched, it may cause the sealing of the battery pack to fail, and even cause the battery pack to catch fire. When the bottom scratch only causes slight damage to the battery pack box body, the voltage, temperature, insulation, etc. of the battery pack do not show abnormalities. In this case, the electric new energy vehicle may continue to be used, but the battery pack box body is very likely to have its sealing fail due to scratching, resulting in the battery pack being flooded when the electric new energy vehicle wades again, triggering serious accidents such as insulation and thermal runaway.

[0025] Based on this, the embodiments of the present application provide a damage detection device to detect the damage of the battery pack box body at the bottom of a new energy vehicle through the damage detection device, so as to improve the safety performance of the new energy vehicle.

[0026] The following will Figures 1 to 2 specifically describe the damage detection device provided by the embodiments of the present application.

[0027] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a damage detection device provided by an embodiment of the present application. As Figure 1 shown, the damage detection device is arranged at the bottom of the battery bottom guard plate 101. The damage detection device includes an isolation module 200, a circuit detection module 300, and an anti-impact module 400 that are stacked. The isolation module 200 is arranged between the bottom of the battery bottom guard plate 101 and the circuit detection module 300, and the circuit detection module 300 is connected to the battery management system.

[0028] Optionally, the isolation module 200 is used to insulate and isolate the battery bottom guard plate 101 from the circuit detection module 300. The circuit detection module 300 is used to detect whether the circuit is disconnected due to the impact on the battery bottom guard plate 101. The anti-impact module 400 is used to prevent slight scratches from damaging the circuit detection module 300.

[0029] Among them, the battery bottom guard plate is used to protect the battery system. A battery management system is provided in the battery system. The battery management system is connected to the circuit detection module, can send signals to the circuit detection module and receive the signals fed back by the circuit detection module, and then detect the on / off of the circuit detection module through the flow of these signals, so as to determine whether the battery bottom guard plate has been scratched.

[0030] Exemplarily, the battery bottom guard plate includes aluminum alloy material and sheet metal material. A replaceable battery bottom guard plate can be used here to facilitate the repair and replacement of the battery bottom guard plate.

[0031] Optionally, a battery management system (BMS) is included in the battery system. The BMS processes fault alarms by collecting the detection signals output by the detection module of the acquisition loop. Exemplarily, a 12V voltage or a PWM signal can be used as the detection signal.

[0032] In the above-mentioned damage detection device, the battery management system is used to detect the conduction state of the detection module of the loop. When the bottom of the battery bottom guard plate is scratched, the detection module of the loop is damaged due to impact. At this time, the loop of the battery management system is disconnected to output the result that the bottom of the battery bottom guard plate has been scratched, so that the user can give an early warning in time and maintain the battery bottom guard plate, etc. Furthermore, through the damage detection device, the damage of the battery pack box at the bottom of the new energy vehicle can be detected to improve the safety performance of the new energy vehicle.

[0033] In an alternative embodiment, the isolation module 200 includes an insulating isolation plate covering the bottom of the battery bottom guard plate, and the size of the plate surface of the insulating isolation plate is the same as the area size of the bottom of the battery bottom guard plate.

[0034] Here, the isolation module exists in the form of an insulating isolation plate. The insulating isolation plate covers the bottom of the battery bottom guard plate to isolate the battery bottom guard plate from the detection module of the loop. Among them, the size of the plate surface of the insulating isolation plate is the same as the area size of the bottom of the battery bottom guard plate, which can ensure that the insulating isolation plate completely covers the battery bottom guard plate, thereby achieving better isolation between the battery bottom guard plate and the detection module of the loop.

[0035] Optionally, an insulating paint is covered on the insulating isolation plate. The insulating paint has excellent electrical insulation properties and can be cured into an insulating film under certain conditions, so as to realize the insulating isolation characteristics of the insulating isolation plate.

[0036] Exemplarily, the insulating paint contains a base material, a flame retardant, a curing agent, a pigment filler, a solvent, etc., and is used to insulate and isolate the battery bottom guard plate from the copper foil detection module of the loop.

[0037] In an alternative embodiment, the detection module 300 of the loop includes a copper foil. The input end of the copper foil is connected to the output end of the battery management system, and the output end of the copper foil is connected to the input end of the battery management system.

[0038] Optionally, as Figure 2 shown, the copper foil is distributed in a serpentine shape, and the area size of the serpentine distribution is the same as the area size of the bottom of the battery bottom guard plate.

[0039] With such a setting, it can ensure that the copper foil is evenly distributed at the bottom of the battery bottom guard plate. When the bottom of the battery bottom guard plate is impacted, it can ensure that the copper foil is also impacted, and then promptly output a signal to the battery management system, which helps the battery management system to detect in a timely manner the situation that the bottom of the battery bottom guard plate is impacted.

[0040] In addition, the serpentine-distributed copper foil can increase the usage strength of the copper foil, thereby improving the bending strength of the copper foil. Moreover, it is convenient to disassemble, which helps personnel to perform convenient replacement, inspection and maintenance. While improving the anti-bending strength of the copper foil, it can effectively help the copper foil to have good impact perception, making the usage stability of the copper foil better and having high practicality.

[0041] Exemplarily, the width of the copper foil can be set to 30 mm, and the thickness of the copper foil can be set to 0.15 mm.

[0042] In an alternative embodiment, the loop detection module 300 further includes connection terminals respectively connected to both ends of the copper foil, one of the connection terminals is connected to the output end of the battery management system, and the other connection terminal is connected to the input end of the battery management system.

[0043] That is to say, the copper foil includes two connection terminals, which are respectively located at both ends of the copper foil. When any point of the copper foil is broken, that is, the loop detection module is disconnected.

[0044] Here, the copper foil is connected to the battery management system through the connection terminals, which can ensure the accuracy of the connection, thereby avoiding poor contact between the copper foil and the battery management system, and helping to improve the detection accuracy of the battery management system.

[0045] Exemplarily, connection terminals are welded to both ends of the copper foil and connected to the BMS. A 12V voltage signal or a PWM signal can be used as the detection signal. When the BMS cannot detect the 12V voltage signal or the PWM signal is invalid, it is determined that the copper foil at the bottom of the vehicle battery bottom guard plate is damaged and disconnected due to external force. At this time, the BMS gives an instrument fault warning prompt, and the user can perform maintenance detection according to the fault warning prompt.

[0046] Optionally, the connection terminals at both ends of the copper foil can be directly connected to the battery management system, or can be first connected to the vehicle wiring harness and then connected to the battery management system through the vehicle wiring harness. The specific connection method can be limited according to the actual situation and will not be specifically specified here.

[0047] Further, if the user fails to detect in time, the BMS can enter the early warning and monitoring. When there are sudden changes in temperature, voltage, and a decrease in insulation resistance value, the big data platform gives a fault early warning alarm, and the vehicle manufacturer takes the initiative to detect and maintain the vehicle. After repairing the copper foil and re-spraying PVC glue, the UDS fault is cleared and the early warning and monitoring are exited. Among them, the control logic of the early warning and monitoring is that the thermal runaway threshold after the scraping fault is less than the thermal runaway threshold without scraping, and the insulation resistance fault alarm threshold after the scraping fault is less than the insulation fault threshold without scraping, so as to identify in advance the insulation fault caused by the thermal runaway seal failure caused by scraping.

[0048] In addition, the battery management system can also adopt the following control strategy to achieve breakage alarm:

[0049] (1) When the vehicle is in normal use and the bottom of the battery pack is not damaged due to scraping, when the BMS detects that the copper foil connection is intact and the detection circuit is conducting, the BMS performs fault alarm protection according to the normal insulation resistance value of K1 less than 500Ω / V. The determination conditions for T1 thermal runaway are: the temperature rise ≥ 3℃ within 5s, and the highest temperature > 60℃, and the air pressure is greater than 1.3 times the standard atmospheric pressure, and the single-cell voltage ≤ 2.0V, and the voltage difference ≥ 500mV, that is, all faults are alarmed according to the normal threshold.

[0050] (2) When the bottom guard plate of the battery pack is damaged due to scraping of the vehicle chassis, when the BMS detects that the copper foil is damaged and the detection circuit is disconnected, the BMS enters the early warning and monitoring process, and identifies in advance the thermal runaway fault caused by the seal failure caused by the scraping of the battery pack or the battery damage, until the battery pack is inspected and the scraping fault is cleared and then exits the early warning and monitoring. When entering the fault early warning and monitoring, the BMS adjusts the insulation resistance value K2 threshold to less than 1000Ω / V for fault alarm protection, which can early warn that the seal problem caused by the damage of the battery pack affects the insulation resistance value of the power battery pack, and sets the determination conditions for T2 thermal runaway to a smaller threshold: such as the temperature rise ≥ 2℃ within 5s, and the highest temperature > 60℃, and the air pressure is greater than 1.2 times the standard atmospheric pressure, and the single-cell voltage ≤ 2.5V, and the voltage difference ≥ 200mV for fault alarm. Since all fault thresholds are set to smaller values, it can ensure timely identification of the thermal runaway risk when the bottom of the battery pack is damaged by scraping.

[0051] In an optional embodiment, the anti-impact module 400 includes chassis armor paint, and the paint surface size of the chassis armor paint is consistent with the area size of the bottom of the battery bottom guard plate.

[0052] This can ensure that the chassis armor paint forms a good protection function for the battery bottom guard plate, prevent the bottom of the battery bottom guard plate from being damaged by a slight impact, thereby improving the service life of the battery bottom guard plate and the service life of the battery pack box.

[0053] Optionally, the chassis armor paint includes PVC glue, and the spraying thickness of the PVC glue is greater than five times the thickness of the copper foil in the loop detection module.

[0054] Here, chassis armor paint is often used to prevent impact on the car chassis and the bottom of the battery pack box. The spray thickness of PVC glue is five times greater than the thickness of the copper foil to prevent damage to the copper foil by slight scratches.

[0055] For example, a copper foil layer is embedded in the bottom of the battery pack box and covered with PVC glue. The BMS system detects the conduction status of its circuit. When the bottom of the battery pack box is scratched, the copper foil embedded in the PVC glue is damaged due to the impact. At this time, the detection circuit of the BMS system is disconnected, and it is determined that the bottom of the battery pack box is scratched. The fault prompt of the scratch on the bottom of the battery pack box is displayed on the vehicle instrument to remind the user to replace the battery bottom guard plate in time.

[0056] For example, the embodiment of the present application can implement the setting of the damage detection device through the following steps:

[0057] First, spray insulating paint on the battery bottom guard plate for insulation and isolation protection. After the insulating paint is dried, stick the copper foil with adhesive backing to the battery bottom guard plate sprayed with insulating paint, and then spray the chassis armor paint (such as PVC glue) to completely protect the copper foil in the PVC glue bottom layer. Then install the battery system under the vehicle chassis and cover the battery system with a battery bottom guard plate. Finally, physically connect the copper foil terminal to the BMS. The BMS detects the status of the copper foil in real time through a 12V voltage signal or a PWM signal.

[0058] In the embodiment of the present application, when the bottom of the battery bottom guard plate is scratched, the copper foil is damaged due to the impact. At this time, the circuit of the battery management system is disconnected to output the result that the bottom of the battery bottom guard plate is scratched, so that the user can give a timely warning and perform maintenance on the battery pack box or the battery bottom guard plate. Furthermore, the damage detection device can detect the damage of the battery pack box at the bottom of the new energy vehicle to improve the safety performance of the new energy vehicle.

[0059] Based on the same concept, the embodiment of the present application also provides a vehicle, including a battery system 100 and a battery bottom guard plate 101 carrying the battery system 100, and the bottom of the battery bottom guard plate 101 is provided with Figure 1 In the damage detection device shown, the circuit detection module 300 in the damage detection device is connected to the battery management unit (BMS) in the battery system 100 .

[0060] Among them, the description of the damage detection device can refer to the above Figure 1 The description of the damage detection device shown will not be repeated here.

[0061] Optionally, the vehicle further includes a fault prompt device, which is connected to the battery management unit.

[0062] Here, the fault prompt information output by the fault prompt device can be displayed on the vehicle instrument, so that the user can observe the fault prompt information in time and take corresponding measures in time.

[0063] Furthermore, the vehicle provided by the embodiment of the present application can detect the damage of the battery pack box at the bottom of the new energy vehicle through the damage detection device, so as to improve the safety performance of the new energy vehicle.

[0064] Finally, it should be noted that the above embodiments are only specific implementation manners of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present application can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A damage detection device is provided at the bottom of the battery bottom guard plate, characterized in that, The damage detection device includes an isolation module, a circuit detection module, and an anti-impact module that are stacked. The isolation module is disposed between the bottom of the battery bottom guard plate and the circuit detection module, and the circuit detection module is connected to the battery management system; Among them, the circuit detection module includes a copper foil. The input end of the copper foil is connected to the output end of the battery management system, and the output end of the copper foil is connected to the input end of the battery management system.

2. The damage detection device according to claim 1, characterized in that The isolation module includes an insulating isolation plate covering the bottom of the battery bottom guard plate, and the size of the plate surface of the insulating isolation plate is the same as the area size of the bottom of the battery bottom guard plate.

3. The damage detection device according to claim 2, characterized in that, The insulating isolation plate is covered with insulating paint.

4. The damage detection device according to claim 1, characterized in that, The copper foil is distributed in a serpentine shape, and the area size of the serpentine distribution is the same as the area size of the bottom of the battery bottom guard plate.

5. The breakage detection device according to claim 1, characterized in that The circuit detection module further includes connection terminals respectively connected to both ends of the copper foil. One connection terminal is connected to the output end of the battery management system, and the other connection terminal is connected to the input end of the battery management system.

6. The damage detection device according to claim 1, wherein, The anti-impact module includes chassis armor paint, and the paint surface size of the chassis armor paint is the same as the area size of the bottom of the battery bottom guard plate.

7. The breakage detection device according to claim 6, wherein The chassis armor paint includes PVC glue, and the spraying thickness of the PVC glue is more than five times the thickness of the copper foil in the circuit detection module.

8. A vehicle, characterized in that, It includes a battery system and a battery bottom guard plate carrying the battery system. The damage detection device as described in any one of claims 1 to 7 is provided at the bottom of the battery bottom guard plate, and the circuit detection device in the damage detection device is connected to the battery management unit in the battery system.

9. The vehicle according to claim 8, characterized in that, The vehicle further includes a fault prompt device, and the fault prompt device is connected to the battery management unit.

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