Battery collision damage detection method and system and vehicle

Abstract

The invention provides a battery collision damage detection method and system and a vehicle, and the method comprises the steps: obtaining an air pressure value and a temperature value of an air bag layer in a vehicle battery pack, and enabling the air bag layer to be arranged at the bottom of a battery of the battery pack; the temperature value is monitored in real time, and if the temperature value is within a preset temperature interval, the air pressure value is monitored in real time; if it is monitored that the air pressure value is suddenly increased and then returns to normal, it is determined that collision occurs at the bottom of the battery; if it is monitored that the air pressure value is suddenly increased and then remains unchanged, it is determined that the bottom of the battery collides and a battery bottom protection plate deforms; and if it is monitored that the air pressure value is suddenly reduced and then remains unchanged, determining that the bottom of the battery is collided and the bottom protective plate of the battery is damaged. Through the detection mode, the severity degree of collision at the bottom of the battery and whether deformation or damage of the bottom protection plate is accompanied or not are accurately judged, the collision damage condition of the battery can be detected in time, and potential threats of collision accidents to the safety of vehicles and passengers can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery safety technology, and in particular to a method, system and vehicle for detecting battery collision damage. Background Art

[0002] New energy electric vehicles include pure electric vehicles, plug-in hybrid vehicles and extended-range vehicles. Due to their energy-saving and environmentally friendly advantages, they have become the trend of development in today's automobile industry. However, when the battery pack of a new energy vehicle hits the bottom, it may cause damage to the battery pack shell or even damage to the internal structure. In severe cases, it may cause the battery pack to catch fire and explode, affecting user safety. Existing battery pack bottoming detection methods include: arranging a brittle conductive material layer on the inner surface of the bottom of the battery pack shell, monitoring the continuity of the conductive layer, and detecting whether the battery pack is damaged; monitoring whether the vehicle chassis hits the bottom according to the degree of vehicle body fluctuation, battery parameter signals, vehicle fault signals and driver behavior signals.

[0003] However, in the related art, the existing battery pack bottom collision detection method is that when the power battery has a bottom collision condition, only the battery bottom guard plate is damaged, while other components inside the battery (liquid cooling plate, battery cells) are not damaged. The battery pack will not report a fault, and the user is unaware of the battery damage. This will cause the user to be involved in wading or bottom collision conditions again during subsequent use, thereby causing insulation problems or more serious damage, or even fire and explosion. Therefore, there is an urgent need for an analysis method that can timely detect battery collision damage conditions. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present application discloses a method, system and vehicle for detecting battery collision damage, which are used to solve the problem in the prior art that new energy electric vehicles cannot detect battery collision damage in a timely manner.

[0005] In a first aspect, the present application provides a method for detecting battery collision damage, the method comprising: obtaining the air pressure value and temperature value of an airbag layer in a vehicle battery pack, the airbag layer being arranged at the bottom of the battery of the battery pack; monitoring the temperature value in real time, and if the temperature value is within a preset temperature range, monitoring the air pressure value; if it is monitored that the air pressure value suddenly increases and then returns to normal, it is determined that a collision has occurred at the bottom of the battery; if it is monitored that the air pressure value suddenly increases and then remains unchanged, it is determined that a collision has occurred at the bottom of the battery and the battery bottom guard plate is deformed; if it is monitored that the air pressure value suddenly decreases and then remains unchanged, it is determined that a collision has occurred at the bottom of the battery and the battery bottom guard plate is damaged.

[0006] In one embodiment of the present application, the battery bottom is composed of a battery bottom protective plate, an airbag layer and a heat insulation layer from bottom to top.

[0007] In one embodiment of the present application, if the bottom of the battery is a liquid cooling structure, a liquid cooling plate is provided above the insulation layer. The insulation layer is made of insulation material and is used to isolate the air pressure of the airbag layer from the influence of the battery charging and discharging process or the temperature change of the liquid cooling plate.

[0008] In one embodiment of the present application, it further includes: sending the collision condition of the bottom of the battery to a vehicle control unit, and the vehicle control unit controls a display terminal to display the collision condition of the bottom of the battery.

[0009] In one embodiment of the present application, the vehicle control unit controls the instrument panel to display the collision condition of the bottom of the battery, including:

[0010] If it is determined that a collision has occurred at the bottom of the battery, the display terminal will display that only the collision has occurred at the bottom of the battery, and a first warning message will be generated, which will be notified to the driver by voice broadcast in the vehicle, and / or the first warning message will be forwarded to the terminal associated with the vehicle owner through the cloud; if it is determined that a collision has occurred at the bottom of the battery and the collision result includes deformation of the bottom battery guard plate, the display terminal will display that the collision has occurred at the bottom of the battery and deformation of the bottom battery guard plate, and a second warning message will be generated, which will be notified to the driver by voice broadcast in the vehicle, and / or the second warning message will be forwarded to the terminal associated with the vehicle owner through the cloud; if it is determined that a collision has occurred at the bottom of the battery and the collision result includes damage to the bottom battery guard plate, the display terminal will display that the collision has occurred at the bottom of the battery and damage to the bottom battery guard plate, and a third warning message will be generated, which will be notified to the driver by voice broadcast in the vehicle, and / or the third warning message will be forwarded to the terminal associated with the vehicle owner through the cloud; wherein the warning levels of the first warning message, the second warning message and the third warning message are from low to high.

[0011] In one embodiment of the present application, if the second warning information or the third warning information is received and it is monitored that the vehicle is a new energy hybrid vehicle, the power output of the battery pack is cut off; after cutting off the power output of the battery pack, the vehicle is parked in a preset safety area using the engine as power to confirm the collision condition of the battery pack; if the battery pack is detected to be damaged, a fourth warning information is generated, and the driver is informed by voice broadcast in the vehicle to get off and wait for rescue, and / or the fourth warning information is forwarded to the terminal associated with the owner through the cloud, and the warning level of the fourth warning information is higher than the warning level of the third warning information.

[0012] In one embodiment of the present application, before monitoring the air pressure value, it also includes: obtaining the acceleration value and collision force value of the battery pack, the collision force value includes detecting the lateral collision force and / or longitudinal collision force of the vehicle; if the acceleration value meets the preset acceleration value, and the lateral collision force and / or the longitudinal collision force meets the preset collision force, it is determined that the vehicle has collided; if the acceleration value does not meet the preset acceleration value, and / or the lateral collision force or the longitudinal collision force does not meet the preset collision force, the air pressure value monitoring is not performed.

[0013] In one embodiment of the present application, the airbag layer is an airbag bag filled with inert gas, and an air pressure sensor and a temperature sensor are arranged in the airbag bag to collect the air pressure value and temperature value of the airbag layer.

[0014] In a second aspect, the present application provides a battery collision damage detection system, the system comprising: an acquisition module, used to acquire the air pressure value and temperature value of the airbag layer in a vehicle battery pack, the airbag layer being arranged at the bottom of the battery of the battery pack; a temperature monitoring module, used to monitor the temperature value in real time, and if the temperature value is within a preset temperature range, monitor the air pressure value; a first detection module, used to determine that a collision has occurred at the bottom of the battery if it is monitored that the air pressure value suddenly increases and then returns to normal; a second detection module, used to determine that a collision has occurred at the bottom of the battery and the battery bottom guard plate is deformed if it is monitored that the air pressure value suddenly increases and then remains unchanged; a third detection module, used to determine that a collision has occurred at the bottom of the battery and the battery bottom guard plate is damaged if it is monitored that the air pressure value suddenly decreases and then remains unchanged.

[0015] In a third aspect, the present application provides a vehicle, comprising: one or more processors; a storage device for storing one or more programs, which, when executed by one or more processors, enables the vehicle to implement the battery collision damage detection method described in the first aspect.

[0016] As described above, the battery collision damage detection method, system and vehicle provided by the embodiments of the present application have the following beneficial effects:

[0017] The air pressure value and temperature value of the airbag layer in the vehicle battery pack are obtained, and the temperature value is monitored in real time. If the temperature value is within the preset temperature range, the air pressure value is monitored. In this way, the influence of the temperature change of the airbag layer on the air pressure value can be effectively avoided, thereby ensuring the accuracy of detecting the battery collision according to the air pressure value; if it is monitored that the air pressure value suddenly increases and then returns to normal, it is determined that a collision has occurred at the bottom of the battery; if it is monitored that the air pressure value suddenly increases and then remains unchanged, it is determined that a collision has occurred at the bottom of the battery and the battery bottom guard plate is deformed; if it is monitored that the air pressure value suddenly decreases and then remains unchanged, it is determined that a collision has occurred at the bottom of the battery and the battery bottom guard plate is damaged; through the above-mentioned detection method, the severity of the collision of the bottom of the battery and whether it is accompanied by deformation or damage of the bottom guard plate can be accurately judged, which can not only timely detect the battery collision damage, but also help reduce the potential threat of collision accidents to the safety of vehicles and occupants.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0020] Figure 1 is a schematic diagram of an implementation environment of a battery collision damage detection system shown in an exemplary embodiment of the present application;

[0021] Figure 2 is a flow chart of a method for detecting battery collision damage shown in an exemplary embodiment of the present application;

[0022] Figure 3 is a schematic structural diagram of a battery bottom of a battery pack shown in an exemplary embodiment of the present application;

[0023] Figure 4 is a complete schematic diagram of a method for detecting battery collision damage shown in an exemplary embodiment of the present application;

[0024] Figure 5 is a block diagram of a battery collision damage detection system shown in an exemplary embodiment of the present application;

[0025] Figure 6 It is a structural schematic diagram of a vehicle provided in one embodiment of the present application. DETAILED DESCRIPTION

[0026] The following will describe the implementation methods of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, not for limiting the scope of protection of the present application.

[0027] It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present application in a schematic manner, and therefore the illustrations only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0028] In the following description, a lot of details are discussed to provide a more thorough explanation of the embodiments of the present application. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present application difficult to understand.

[0029] In the related art, the power battery (i.e., battery pack) of new energy vehicles is arranged at the bottom of the car. During use, the bottom of the battery may be damaged due to bottom collision conditions such as bottoming and scraping. When the bottom guard plate of the battery is damaged due to bottom collision, since other internal components of the battery (liquid cooling plate, battery cell) are not damaged and the battery pack does not report a fault, the user is unaware of the damage to the battery. This situation can easily lead to the user being involved in wading or bottom collision conditions again during subsequent use, which may cause insulation problems or more serious damage, or even fire and explosion. Therefore, in order to improve vehicle safety, it is necessary to consider detecting and notifying the user as soon as possible after the battery pack is damaged.

[0030] Therefore, see Figure 1 , Figure 1 FIG. 1 is a schematic diagram of an implementation environment of a battery collision damage detection system shown in an exemplary embodiment of the present application. Figure 1 As shown, Figure 1As shown, the implementation environment includes a vehicle 110 and a battery collision damage detection system 120, wherein the battery collision damage detection system 120 is embedded in the vehicle 110, and is used to realize communication between processes in the vehicle 110. The battery collision damage detection 120 includes but is not limited to display terminals such as a vehicle system and a vehicle-mounted computer. The air pressure value and temperature value of the airbag layer in the vehicle battery pack are first obtained, and the temperature value is monitored in real time. If the temperature value is within a preset temperature range, the air pressure value is monitored again. If it is monitored that the air pressure value suddenly increases and then returns to normal, it is determined that a collision has occurred at the bottom of the battery; if it is monitored that the air pressure value suddenly increases and then remains unchanged, it is determined that a collision has occurred at the bottom of the battery and the battery bottom guard plate is deformed; if it is monitored that the air pressure value suddenly decreases and then remains unchanged, it is determined that a collision has occurred at the bottom of the battery and the battery bottom guard plate is damaged.

[0031] See also Figure 2 , Figure 2 FIG. 1 is a flow chart of a method for detecting battery collision damage according to an exemplary embodiment of the present application. The method can be applied to Figure 1 The implementation environment shown is a schematic diagram. It should be understood that the method may also be applicable to other exemplary implementation environments, and this embodiment does not limit the implementation environment to which the method is applicable.

[0032] like Figure 2 As shown, in an exemplary embodiment, the method for detecting battery collision damage includes at least steps S210 to S250, which are described in detail as follows:

[0033] Step S210, obtaining the air pressure value and temperature value of the airbag layer in the vehicle battery pack, wherein the airbag layer is arranged at the bottom of the battery of the battery pack;

[0034] It should be understood that vehicles include but are not limited to pure electric vehicles, hybrid vehicles, etc. For example, hybrid vehicles include extended-range electric vehicles and plug-in hybrid vehicles.

[0035] In some embodiments, see Figure 3 , is a schematic structural diagram of a battery bottom of a battery pack according to an exemplary embodiment of the present application, including:

[0036] The bottom of the battery is composed of a bottom guard plate layer 004, an airbag layer 003, an insulation layer 002, and a liquid cooling plate 001. The liquid cooling plate 001 is determined by the cooling form of the power battery. If the selected battery pack is a bottom liquid cooling structure, there is a liquid cooling plate 001. If the selected battery pack is a large surface liquid cooling structure, there is no liquid cooling plate 001. The insulation layer 002 is an insulation material that isolates the influence of the battery cell charging and discharging process or the temperature change of the liquid cooling plate on the air pressure in the airbag. The insulation material can be an aerogel insulation pad, etc. The airbag layer 003 is an airbag bag filled with inert gas. The airbag bag is a special fabric nylon product with a rubber lining. An air pressure sensor and a temperature sensor are arranged in the airbag bag. The air pressure sensor is used to detect the change of air pressure in the airbag bag, and the temperature sensor is used to detect the temperature in the airbag bag. The air pressure sensor and the temperature sensor need to be connected to the BMS (i.e., the battery management system) through a hard line, and the temperature value and the air pressure value are transmitted to the BMS. The bottom guard plate layer 004 is the bottom guard plate of the battery pack, which can be a composite material or a sheet metal structure with a sprayed PVC layer.

[0037] Optionally, if the selected battery pack is a large-surface liquid cooling structure, there is no liquid cooling plate 001. In this case, the bottom of the battery is composed of a battery bottom guard plate, an airbag layer and a heat insulation layer from bottom to top, wherein, by referring to Figure 3 The coordinate system is used to calibrate the bottom-up direction, which will not be repeated here.

[0038] Optionally, if the bottom of the battery is a liquid cooling structure, a liquid cooling plate is provided above the insulation layer. The insulation layer is made of insulation material and is used to isolate the air pressure of the airbag layer from the effects of battery charging and discharging or temperature changes of the liquid cooling plate.

[0039] Optionally, the airbag layer is an airbag bag filled with inert gas, and an air pressure sensor and a temperature sensor are arranged in the airbag bag to collect the air pressure value and the temperature value of the airbag layer.

[0040] In some embodiments, the air pressure sensor is used to detect the air pressure inside the airbag layer in the battery pack and convert the detected air pressure into an electrical signal. That is, in abnormal situations such as collision, extrusion or internal explosion of the battery pack, the air pressure sensor detects the rapid air pressure changes inside the battery pack and converts it into corresponding electrical signal changes. Among them, the air pressure sensor can be a vacuum pressure sensor or a micro-electromechanical system chip with a vacuum cavity, which is not specifically limited in the embodiments of the present application.

[0041] In some embodiments, the temperature sensor includes but is not limited to a resistance temperature detector, a thermocouple, and an IC temperature sensor. The temperature sensor is used to detect the temperature inside the airbag layer in the battery pack and convert the detected temperature into an electrical signal and transmit it to the vehicle control unit.

[0042] Step S220, monitoring the temperature value in real time, and if the temperature value is within a preset temperature range, monitoring the air pressure value;

[0043] Specifically, by setting a preset temperature range, the air pressure value is monitored in real time only when the temperature value is within the range. This design avoids the interference of air pressure fluctuations caused by non-collision factors in judgment under extreme temperature conditions (such as too high or too low temperature) or during battery pack charging, thereby improving the accuracy of collision detection.

[0044] Step S230, if it is monitored that the air pressure value suddenly increases and then returns to normal, it is determined that a collision occurs at the bottom of the battery;

[0045] Step S240, if it is monitored that the air pressure value suddenly increases and then remains unchanged, it is determined that the battery bottom has collided and the battery bottom guard plate has deformed;

[0046] Step S250: If it is monitored that the air pressure value suddenly decreases and then remains unchanged, it is determined that a collision occurs at the bottom of the battery and the battery bottom guard plate is damaged.

[0047] It should be noted that there is no temporal order among step S230 , step S240 and step S250 , and which step is executed first depends on the trigger condition determined.

[0048] Specifically, if the air pressure suddenly increases and then returns to normal, it indicates that a slight collision occurred at the bottom of the battery pack, but did not significantly affect the battery bottom guard plate. If the air pressure suddenly increases and then remains unchanged, it indicates that a more serious collision occurred at the bottom of the battery pack and the battery bottom guard plate was deformed. Since the deformed bottom guard plate limits the recovery of the airbag, the air pressure value continues to remain high.

[0049] If the air pressure value suddenly decreases and then remains unchanged, it means that not only has a collision occurred at the bottom of the battery pack, but the battery bottom guard plate has been damaged. Due to the damaged bottom guard plate, the gas in the airbag leaked rapidly, causing the air pressure value to drop significantly and remain unchanged.

[0050] It should be noted that in this different mode due to changes in air pressure values, it is possible to accurately judge the severity of the collision at the bottom of the battery pack and whether it is accompanied by deformation or damage of the bottom guard plate. This also provides an important basis for subsequent safety assessments and response measures, and helps reduce the potential threat of collision accidents to the safety of vehicles and passengers.

[0051] Through the above method, the air pressure and temperature values ​​of the airbag layer are monitored in real time, and the safety status of the bottom of the battery pack is evaluated based on the change pattern of the air pressure value, thereby achieving rapid and accurate detection and classification of collision events, providing strong support for improving the safety performance of electric vehicles.

[0052] Optionally, the method for detecting battery collision damage further includes: sending the collision condition of the bottom of the battery to a vehicle control unit, and the vehicle control unit controls a display terminal to display the collision condition of the bottom of the battery.

[0053] Among them, display terminals include but are not limited to instrument panels, car computers, mobile phones, tablet computers, computers and handheld devices.

[0054] Specifically, the collision information is sent to the display terminal and displayed on the display terminal, for example, including the severity of the collision, the collision location, and the battery status, etc.

[0055] For example, visual warnings can be used to display corresponding warning information or icons on the display screen of the display terminal to remind the driver to pay attention. For another example, sound warnings can be used to issue sound alarms on the vehicle, such as buzzers or alarms, to attract the driver's attention. For another example, tactile warnings can be used. In some vehicles, tactile warnings are provided by means of seat vibrations or steering wheel vibrations.

[0056] In this embodiment, by sensing the collision event in real time and immediately transmitting the signal to the vehicle control unit for processing, as well as through comprehensive judgment of multiple sensors, the accuracy of collision detection can be improved. Not only can the collision event itself be detected, but also early warning and subsequent processing measures can be provided according to the collision results, effectively reducing the safety risks that may be caused by battery collision damage.

[0057] Optionally, the vehicle control unit controls the display terminal to display the collision condition of the bottom of the battery, including:

[0058] If it is determined that the bottom of the battery has collided, the display terminal displays that only the bottom of the battery has collided, generates a first warning message, informs the driver in a voice broadcast manner in the vehicle, and / or forwards the first warning message to a terminal associated with the vehicle owner through the cloud;

[0059] For example, only the first prompt information of "collision occurs at the bottom of the battery" is displayed; the first warning information including the first prompt information is broadcast in voice form to remind the driver to pay attention; the first warning information is forwarded to the terminal associated with the car owner (such as a mobile phone APP program) through the cloud, so that the car owner can understand the vehicle status in time.

[0060] If it is determined that the battery bottom has collided and the collision result includes deformation of the battery bottom guard plate, the battery bottom has collided and the battery bottom guard plate has deformed, and a second warning message is generated to inform the driver in the vehicle by voice broadcast, and / or the second warning message is forwarded to the terminal associated with the vehicle owner through the cloud;

[0061] For example, the second prompt information of "collision occurred at the bottom of the battery and deformation of the bottom guard plate of the battery" is displayed; the second warning information containing the second prompt information is broadcast in a more urgent voice form in the car to remind the driver to pay attention and take corresponding measures; the second warning information is forwarded to the terminal associated with the car owner through the cloud.

[0062] If it is determined that a collision has occurred at the bottom of the battery and the collision result includes damage to the battery bottom guard plate, the collision at the bottom of the battery and the damage to the battery bottom guard plate are displayed on the display terminal, and a third warning message is generated to inform the driver in the vehicle by voice broadcast, and / or the third warning message is forwarded to the terminal associated with the vehicle owner through the cloud; wherein the warning levels of the first warning message, the second warning message and the third warning message are ranked from low to high.

[0063] For example, the second prompt message "a collision has occurred at the bottom of the battery and the bottom guard plate of the battery is damaged" is displayed, accompanied by a flashing warning light; the third warning message containing the second prompt message is broadcast in the form of the highest level voice alarm, strongly reminding the driver to stop the vehicle immediately and check the vehicle; the third warning message is immediately forwarded to the terminal associated with the car owner through the cloud, and may trigger emergency rescue services.

[0064] Specifically, according to the severity of the collision result, the warning information is divided into three levels: low, medium and high, which are the first warning information, the second warning information and the third warning information, respectively, so that the driver and the car owner can take corresponding countermeasures according to different situations; through various methods such as display on the display terminal, voice broadcast in the car and forwarding to the car owner's terminal through the cloud, it is ensured that the driver and the car owner can receive the warning information in time; for high-level warning information (such as the third warning information), emergency rescue services are automatically triggered to maximize the safety of vehicles and personnel.

[0065] For example, if the vehicle cannot continue to drive safely, the driver should stop the car immediately and contact the rescue service, for example, dial 12123, or directly call the towing phone, etc. If the car owner receives the warning information forwarded by the cloud, he should contact the driver or rescue service as soon as possible to understand the vehicle condition and take appropriate measures.

[0066] Through the above method, after a collision occurs at the bottom of the battery of a new energy vehicle, an emergency strategy consisting of a graded warning mechanism, multi-channel notification and emergency response can be used to ensure the safety of the vehicle and personnel to the greatest extent.

[0067] Optionally, if the second warning information or the third warning information is received and the vehicle is monitored to be a new energy hybrid vehicle, the power output of the battery pack is cut off; after cutting off the power output of the battery pack, the vehicle is parked in a preset safety area using the engine as power to confirm the collision condition of the battery pack; if the battery pack is detected to be damaged, a fourth warning information is generated, and the driver is informed by voice broadcast in the vehicle to get off and wait for rescue, and / or the fourth warning information is forwarded to the terminal associated with the vehicle owner through the cloud, and the warning level of the fourth warning information is higher than the warning level of the third warning information.

[0068] Specifically, for new energy hybrid vehicles, when receiving the second warning information or the third warning information (the warning level of the third warning information is higher than the second warning information), the vehicle control unit immediately cuts off the power output of the battery pack, which can effectively prevent the battery pack from continuing to work in a damaged state, which may cause serious consequences such as short circuit, fire or even explosion. While cutting off the power output of the battery pack, the vehicle control unit will quickly start the engine and use it as a power source to drive the vehicle. In this way, even if the battery pack cannot work normally, the vehicle can continue to drive on the power of the engine. The vehicle will be guided to a preset safety area (emergency lane or service area) for parking. The preset safety area is usually an open area away from people and flammable materials to ensure that no greater safety accidents will be caused if the battery pack is damaged. After the vehicle stops, the battery pack will be inspected in detail to confirm whether it is damaged and the extent of the damage. If the battery pack is not damaged or the damage is only minor, the battery pack can be reconnected and the vehicle can be restored to normal use; if the battery pack is seriously damaged, a fourth warning message is generated, and the driver is informed by voice broadcast in the vehicle to get out of the vehicle and wait for rescue, and further repair or replacement measures by professionals are required, and / or the fourth warning message is forwarded to the terminal associated with the vehicle owner via the cloud.

[0069] Through the above method, when it is detected that the battery pack may be damaged, timely, effective and safe emergency response measures can be taken. The above measures can minimize the safety risks caused by damage to the battery pack and ensure the safety of life and property of the vehicle and passengers.

[0070] Optionally, before monitoring the air pressure value, the method for detecting battery collision damage further includes:

[0071] Acquiring an acceleration value and a collision force value of the battery pack, wherein the collision force value includes detecting a lateral collision force and / or a longitudinal collision force of the vehicle;

[0072] If the acceleration value satisfies a preset acceleration value, and the lateral collision force and / or the longitudinal collision force satisfies a preset collision force, it is determined that the vehicle has collided;

[0073] If the acceleration value does not meet the preset acceleration value, and / or the lateral collision force or the longitudinal collision force does not meet the preset collision force, the air pressure value monitoring is not performed.

[0074] In some embodiments, the battery pack includes a frame and a plurality of battery cells mounted on the frame, and the acceleration sensor can be mounted on the frame. For example, the acceleration sensor is firmly arranged on the (metal) frame of the battery pack, and the installation state meets certain dynamic stiffness requirements, so as to avoid vibration interference with the acceleration signal during vehicle driving. Among them, the battery pack also includes an upper base plate, a lower base plate and a side plate, and the upper base plate, the lower base plate and the side plate are mounted on the frame, and the plurality of battery cells are arranged in a cavity surrounded by the upper base plate, the lower base plate and the side plate. The acceleration sensor is located at the center of the lower base plate, which improves the accuracy of acceleration monitoring, thereby obtaining accurate collision monitoring data.

[0075] In other embodiments, if there are multiple acceleration sensors, an acceleration sensor can be installed at the center of the lower base plate, and an acceleration sensor can be installed at at least one of the four corner positions of the lower base plate, that is, multiple acceleration sensors are located at the center and four corner positions of the lower base plate, respectively, and acceleration monitoring is performed from various positions, reducing the possibility of inaccurate monitoring due to a single acceleration sensor, increasing the accuracy of collision monitoring, and thus reducing safety hazards such as fire caused by untimely detection of battery pack collisions. In other embodiments, if the battery pack is small in size, the number of some acceleration sensors can also be reduced.

[0076] Among them, the air pressure sensor is arranged in the airbag layer of the battery pack. The air pressure sensor can monitor the status of the bottom of the battery in all directions. As long as the battery pack collides, it can be reflected by the air pressure value. There is no need to set the air pressure sensor in multiple positions inside the battery to ensure that the pressure changes after the battery collision cannot be accurately collected, thereby avoiding the vibration interference of the acceleration signal during the vehicle's driving, and further increasing the accuracy of air pressure monitoring of the battery pack.

[0077] In some embodiments, the first collision sensor and the second collision sensor are respectively arranged on the front and left central axis of the battery pack, and the first collision sensor and the second collision sensor may be acceleration sensors. The vehicle control unit determines whether the vehicle collides by determining whether the acceleration values ​​output by the first collision sensor and the second collision sensor are greater than a predetermined first threshold value, and the acceleration value is greater than a preset acceleration value.

[0078] In addition, it is also possible to determine whether the vehicle collision has an impact on the battery pack by judging whether the acceleration values ​​output by the first collision sensor and the second collision sensor are greater than the calibrated threshold value, and whether the acceleration value is greater than the calibrated acceleration value; at the same time, a comprehensive judgment can be made in combination with the air pressure value in the airbag layer of the battery pack. For example, a judgment can be made by judging whether the detection conclusions are the same. If they are the same, the accuracy of the collision detection can be improved; if they are different, the obtained acceleration value and collision force value are used as a reference as the final judgment result.

[0079] In some embodiments, if the acceleration value does not meet the preset acceleration value, or the lateral collision force and / or the longitudinal collision force do not meet the preset collision force; it should be understood that if the acceleration value is less than the preset acceleration value, it means that the current acceleration value does not meet the preset acceleration value; similarly, if the lateral collision force and / or the longitudinal collision force are less than the preset collision force, it means that the current lateral collision force and / or the longitudinal collision force do not meet the preset collision force. If any of the above situations occurs, the air pressure value monitoring will not be performed, that is, there is no need to use the air pressure value to judge the state of the battery collision.

[0080] See also Figure 4 , is a complete schematic diagram of a method for detecting battery collision damage shown in an exemplary embodiment of the present application, including:

[0081] After power-on, the BMS monitors the air pressure and temperature in the airbag bag in real time (010). To prevent the external ambient temperature from affecting the judgment result, the change in air pressure value needs to deduct the influence of temperature (020).

[0082] If at a certain moment, the pressure suddenly increases and then returns to normal (031), it can be determined that the bottom of the power battery has been hit (041);

[0083] If at a certain moment, the pressure is detected to suddenly increase and then remain constant (032), it can be determined that the bottom of the power battery is hit and the bottom guard plate is deformed (042);

[0084] If at a certain moment, the pressure is detected to suddenly decrease and then remain unchanged (033), it can be determined that the bottom of the power battery has been hit and the bottom guard plate is damaged (043);

[0085] In this embodiment, through the above three situations, the judgment result determined by the BMS sends a signal to the vehicle control unit, and the bottom of the power battery (i.e., the battery pack) is hit. The user is then notified through the display terminal that the power battery may have suffered a bottom collision, and a more detailed inspection is required to see whether the bottom guard plate of the power battery is damaged.

[0086] See also Figure 5 , Figure 5is a block diagram of a battery collision damage detection system shown in an exemplary embodiment of the present application. The system can be applied to Figure 1 The implementation environment shown is a schematic diagram. It should be understood that the system may also be applicable to other exemplary implementation environments, and this embodiment does not limit the implementation environment to which the system is applicable.

[0087] like Figure 5 As shown, in an exemplary embodiment, a battery collision damage detection system 500 includes at least an acquisition module 510, a temperature monitoring module 520, a first detection module 530, a second detection module 540 and a third detection module 550, which are described in detail as follows:

[0088] An acquisition module 510 is used to acquire an air pressure value and a temperature value of an airbag layer in a vehicle battery pack, wherein the airbag layer is arranged at the bottom of the battery of the battery pack;

[0089] The temperature monitoring module 520 is used to monitor the temperature value in real time, and if the temperature value is within a preset temperature range, monitor the air pressure value;

[0090] A first detection module 530 is used to determine that a collision occurs at the bottom of the battery if it is detected that the air pressure value suddenly increases and then returns to normal;

[0091] The second detection module 540 is used to determine that a collision occurs at the bottom of the battery and the battery bottom guard plate is deformed if it is monitored that the air pressure value suddenly increases and then remains unchanged;

[0092] The third detection module 550 is used to determine that a collision occurs at the bottom of the battery and the battery bottom guard plate is damaged if it is monitored that the air pressure value suddenly decreases and then remains unchanged.

[0093] It should be noted that the battery collision damage detection system provided in the above embodiment and the battery collision damage detection method provided in the above embodiment belong to the same concept, wherein the contents of the operations performed by each module have been described in detail in the method embodiment and will not be repeated here.

[0094] In the battery collision damage detection system of the present application, the air pressure value and temperature value of the airbag layer in the vehicle battery pack are obtained, and the temperature value is monitored in real time. If the temperature value is within the preset temperature range, the air pressure value is monitored. In this way, the influence of the temperature change of the airbag layer on the air pressure value can be effectively avoided, thereby ensuring the accuracy of the subsequent battery collision detection based on the air pressure value; if it is monitored that the air pressure value suddenly increases and then returns to normal, it is determined that a collision has occurred at the bottom of the battery; if it is monitored that the air pressure value suddenly increases and then remains unchanged, it is determined that a collision has occurred at the bottom of the battery and the battery bottom guard plate is deformed; if it is monitored that the air pressure value suddenly decreases and then remains unchanged, it is determined that a collision has occurred at the bottom of the battery and the battery bottom guard plate is damaged; through the above-mentioned detection method, it is possible to accurately judge the severity of the battery bottom collision and whether it is accompanied by deformation or damage of the bottom guard plate. Not only can the battery collision damage be detected in a timely manner, but it also helps to reduce the potential threat of collision accidents to the safety of vehicles and occupants.

[0095] See also Figure 6 , Figure 6 It is a structural schematic diagram of a vehicle provided in one embodiment of the present application. Figure 6 The schematic diagram of the structure of the computer system of the vehicle suitable for implementing the embodiment of the present application is shown. It should be noted that: Figure 6 The vehicle computer system 600 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0096] like Figure 6 As shown, the computer system 600 includes a central processing unit (CPU) 601, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 602 or the program loaded from the storage part 608 to the random access memory (RAM) 603, such as executing the method in the above embodiment. In the RAM 603, various programs and data required for system operation are also stored. The CPU 601, the ROM 602 and the RAM 603 are connected to each other through the bus 604. The input / output (I / O) interface 605 is also connected to the bus 604.

[0097] The following components are connected to the I / O interface 605: an input section 606 including a keyboard, a mouse, etc.; an output section 607 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 608 including a hard disk, etc.; and a communication section 609 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I / O interface 605 as needed. A removable medium 611, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 610 as needed so that a computer program read therefrom is installed into the storage section 608 as needed.

[0098] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication section 609, and / or installed from a removable medium 611. When the computer program is executed by a central processing unit (CPU) 601, various functions defined in the system of the present application are executed.

[0099] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. Among them, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the above-mentioned module, a program segment or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0100] The units involved in the embodiments described in this application may be implemented by software or hardware, and the units described may also be set in a processor. The names of these units do not constitute limitations on the units themselves in some cases.

[0101] The above embodiments are merely illustrative of the principles and effects of the present application, and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A method for detecting battery collision damage, characterized in that: The method comprises: Obtaining an air pressure value and a temperature value of an airbag layer in a vehicle battery pack, wherein the airbag layer is disposed at the bottom of a battery in the battery pack; Monitor the temperature value in real time, and if the temperature value is within a preset temperature range, monitor the air pressure value; If it is monitored that the air pressure value suddenly increases and then returns to normal, it is determined that a collision occurs at the bottom of the battery; If it is monitored that the air pressure value suddenly increases and then remains unchanged, it is determined that the bottom of the battery has collided and the battery bottom guard plate has deformed; If it is monitored that the air pressure value suddenly decreases and then remains unchanged, it is determined that a collision occurs at the bottom of the battery and the battery bottom guard plate is damaged.

2. The method for detecting battery collision damage according to claim 1, characterized in that: The battery bottom is composed of a battery bottom protective plate, an airbag layer and a heat insulation layer from bottom to top.

3. The method for detecting battery collision damage according to claim 2, characterized in that: If the bottom of the battery is a liquid cooling structure, a liquid cooling plate is provided above the insulation layer. The insulation layer is made of insulation material and is used to isolate the impact of the battery charging and discharging process or the temperature change of the liquid cooling plate on the air pressure of the airbag layer.

4. The method for detecting battery collision damage according to claim 1, characterized in that: Also includes: The collision condition of the bottom of the battery is sent to a vehicle control unit, and the vehicle control unit controls a display terminal to display the collision condition of the bottom of the battery.

5. The method for detecting battery collision damage according to claim 4, characterized in that: The vehicle control unit controls the display terminal to display the collision condition of the bottom of the battery, including: If it is determined that the bottom of the battery has collided, the display terminal displays that only the bottom of the battery has collided, generates a first warning message, informs the driver in a voice broadcast manner in the vehicle, and / or forwards the first warning message to a terminal associated with the vehicle owner through the cloud; If it is determined that the battery bottom has collided and the collision result includes deformation of the battery bottom guard plate, the battery bottom has collided and the battery bottom guard plate has deformed, and a second warning message is generated, which is notified to the driver in a voice broadcast manner in the vehicle, and / or the second warning message is forwarded to a terminal associated with the vehicle owner through the cloud; If it is determined that the battery bottom has collided and the collision result includes damage to the battery bottom guard plate, the battery bottom has collided and the battery bottom guard plate is damaged, and a third warning message is generated, which is notified to the driver in a voice broadcast manner in the vehicle, and / or the third warning message is forwarded to the terminal associated with the vehicle owner through the cloud; Among them, the warning levels of the first warning information, the second warning information and the third warning information are from low to high.

6. The method for detecting battery collision damage according to claim 5, characterized in that: If the second warning information or the third warning information is received and the vehicle is detected to be a new energy hybrid vehicle, the power output of the battery pack is cut off; after the power output of the battery pack is cut off, the vehicle is parked in a preset safety area using the engine as power to confirm the collision condition of the battery pack; If damage to the battery pack is detected, a fourth warning message is generated, and the driver is informed by voice broadcast in the vehicle to get out of the vehicle and wait for rescue, and / or the fourth warning message is forwarded to the terminal associated with the vehicle owner via the cloud. The warning level of the fourth warning message is higher than the warning level of the third warning message.

7. The method for detecting battery collision damage according to claim 1, characterized in that: Before monitoring the air pressure value, the method further includes: Acquiring an acceleration value and a collision force value of the battery pack, wherein the collision force value includes detecting a lateral collision force and / or a longitudinal collision force of the vehicle; If the acceleration value satisfies a preset acceleration value, and the lateral collision force and / or the longitudinal collision force satisfies a preset collision force, it is determined that the vehicle has collided; If the acceleration value does not meet the preset acceleration value, and / or the lateral collision force or the longitudinal collision force does not meet the preset collision force, the air pressure value monitoring is not performed.

8. The method for detecting battery collision damage according to claim 2, characterized in that: The airbag layer is an airbag bag filled with inert gas, and an air pressure sensor and a temperature sensor are arranged in the airbag bag to collect the air pressure value and temperature value of the airbag layer.

9. A battery collision damage detection system, characterized in that: The system comprises: An acquisition module, used to acquire the air pressure value and temperature value of the airbag layer in the vehicle battery pack, wherein the airbag layer is arranged at the bottom of the battery of the battery pack; A temperature monitoring module, used to monitor the temperature value in real time, and if the temperature value is within a preset temperature range, monitor the air pressure value; A first detection module is used to determine that a collision occurs at the bottom of the battery if it is detected that the air pressure value suddenly increases and then returns to normal; A second detection module is used to determine that a collision occurs at the bottom of the battery and the battery bottom guard plate is deformed if it is detected that the air pressure value suddenly increases and then remains unchanged; The third detection module is used to determine that a collision occurs at the bottom of the battery and the battery bottom guard plate is damaged if it is monitored that the air pressure value suddenly decreases and then remains unchanged.

10. A vehicle, characterized in that: include: one or more processors; A storage device for storing one or more programs, which, when executed by one or more processors, enables the electronic device to implement the method for detecting battery collision damage as described in any one of claims 1 to 8.

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