Battery pack warning method, system, device and storage medium

Abstract

The present invention discloses a battery pack early warning method, system, device and storage medium. The collision situation of the battery pack is monitored by an acceleration sensor and a pressure sensor on the battery pack to obtain collision monitoring data and air pressure monitoring data. Then, whether the battery pack has a safety risk is determined based on the collision monitoring data and the air pressure monitoring data. If the battery pack has a safety risk, a safety warning is issued to the battery pack. In the present invention, the collision situation is monitored by installing an acceleration sensor and a pressure sensor on the battery pack, so that a safety warning is issued to the battery pack when there is a safety risk. This can reduce the probability of the battery pack being undetected after a collision, accurately and timely issue a safety warning based on the collision situation of the battery pack during vehicle driving, reduce the fire, spontaneous combustion and the like that may occur if the vehicle continues to be used without finding any abnormality after the battery pack is bumped, and reduce safety hazards.

Description

Technical Field

[0001] The present invention relates to the field of battery pack safety technology, and in particular to a battery pack early warning method, system, device and storage medium. Background Art

[0002] With the popularity of electric vehicles and the increasing use of power batteries and energy storage batteries, the safety issues of vehicle battery packs have become increasingly prominent. For example, during normal use of a vehicle, the battery pack is prone to bumping into obstacles on the ground (such as stones, ditches, etc.). A severely bumped battery pack may catch fire on the spot, but in most cases the damage to the battery pack does not reach the level of fire. The damage to the battery pack caused by the collision is difficult to detect in time. Some damaged battery packs may fail to seal due to cracks during subsequent use, or the deformed battery pack may squeeze the battery cells or high-voltage components, which may eventually lead to water ingress or internal squeezing, resulting in a short circuit and fire, posing a major safety hazard. Summary of the Invention

[0003] The present invention provides a battery pack early warning method, system, device and storage medium to solve the technical problem that damage to the battery pack caused by collision during vehicle use is difficult to be discovered in time, which can easily lead to battery pack short circuit and fire, posing a safety hazard.

[0004] A battery pack early warning method is provided, comprising:

[0005] The collision condition of the battery pack is monitored by the acceleration sensor and pressure sensor on the battery pack to obtain collision monitoring data and air pressure monitoring data;

[0006] Determine whether the battery pack has safety risks based on collision monitoring data and air pressure monitoring data;

[0007] If there is a safety risk in the battery pack, a safety warning will be issued for the battery pack.

[0008] Furthermore, a safety warning is provided for the battery pack, including:

[0009] Determine the risk level of the battery pack based on collision monitoring data and air pressure monitoring data;

[0010] Provide graded safety warnings for battery packs based on risk levels.

[0011] Furthermore, the risk level of the battery pack is determined based on the collision monitoring data and the air pressure monitoring data, including:

[0012] Determine whether the battery pack's air tightness is normal based on the air pressure monitoring data;

[0013] If the airtightness of the battery pack is normal, the risk level of the battery pack is determined based on the collision monitoring data.

[0014] Furthermore, after determining whether the air tightness of the battery pack is normal based on the air pressure monitoring data, the method further includes:

[0015] If the airtightness of the battery pack fails, the risk level of the battery pack is determined to be the first risk level.

[0016] Furthermore, the risk level of the battery pack is determined based on the collision monitoring data, including:

[0017] Obtain the vehicle status and the acceleration values ​​in different directions from the collision monitoring data. The different directions include X, Y, and Z directions. The Y direction is the vehicle's travel direction, the Z direction is the vehicle's height direction, and the X direction is perpendicular to the Y and Z directions.

[0018] When the vehicle is in a driving state, the collision level of the battery pack in the X direction is determined based on the acceleration value in the X direction, and the collision level of the battery pack in the Z direction is determined based on the acceleration value in the Z direction;

[0019] The risk level of the battery pack is determined based on the collision level of the battery pack in the X direction and the collision level in the Z direction.

[0020] Furthermore, determining the collision level of the battery pack in the X direction according to the acceleration value in the X direction includes:

[0021] Determining whether the acceleration value in the X direction is less than a first preset acceleration;

[0022] If the acceleration value in the X direction is greater than or equal to the first preset acceleration, determining that the collision level of the battery pack in the X direction is the first collision level;

[0023] If the acceleration value in the X direction is less than the first preset acceleration, the collision level of the battery pack in the X direction is determined to be the second collision level, and the collision degree of the first collision level is higher than that of the second collision level.

[0024] Furthermore, determining the collision level of the battery pack in the Z direction according to the acceleration value in the Z direction includes:

[0025] Determining whether the acceleration value in the Z direction is less than a second preset acceleration;

[0026] If the acceleration value in the Z direction is greater than or equal to the second preset acceleration, the collision level of the battery pack in the Z direction is determined to be the first collision level;

[0027] If the acceleration value in the Z direction is less than the second preset acceleration, determining whether the acceleration value in the Z direction is less than the first preset acceleration, and the second preset acceleration is greater than the first preset acceleration;

[0028] If the acceleration value in the Z direction is greater than or equal to the first preset acceleration, determining that the collision level of the battery pack in the Z direction is the second collision level;

[0029] If the acceleration value in the Z direction is less than the first preset acceleration, the collision level of the battery pack in the Z direction is determined to be the third collision level, and the collision degrees of the first collision level, the second collision level and the third collision level decrease in sequence.

[0030] Furthermore, whether the battery pack presents a safety risk is determined based on the collision monitoring data and the air pressure monitoring data, including:

[0031] determining whether an acceleration value in a non-travel direction in the collision monitoring data is greater than a third preset acceleration;

[0032] If it is greater than a third preset acceleration, it is determined that there is a safety risk to the battery pack.

[0033] Furthermore, after determining whether the acceleration value in the non-driving direction in the collision monitoring data is greater than a third preset acceleration, the method further includes:

[0034] If the acceleration is less than or equal to the third preset acceleration, determining whether the pressure change of the battery pack meets the preset condition according to the pressure monitoring data;

[0035] If the air pressure change of the battery pack meets the preset conditions, it is determined that the airtightness of the battery pack has failed and that there is a safety risk in the battery pack.

[0036] Furthermore, determining whether the gas pressure change of the battery pack meets a preset condition includes:

[0037] Determine the rate of change of the battery pack's air pressure per unit time based on the air pressure monitoring data, which is recorded as the battery pack's air pressure change rate;

[0038] determining whether the rate of change of the air pressure is greater than a preset rate of change of the air pressure;

[0039] If the air pressure change rate is greater than the preset air pressure change rate, it is determined that the air pressure change of the battery pack meets the preset condition.

[0040] Furthermore, after determining whether the air pressure change rate is greater than a preset air pressure change rate, the method further includes:

[0041] If the air pressure change rate is less than or equal to the preset air pressure change rate, then the change rate of the air pressure of the battery pack within the preset time period is determined and recorded as the air pressure change rate of the battery pack;

[0042] Determining whether the rate of change of the air pressure is greater than a preset rate of change;

[0043] If the air pressure change rate is greater than the preset change rate, it is determined that the air pressure change of the battery pack meets the preset condition.

[0044] A battery pack warning system is provided, comprising a battery pack, an acceleration sensor, a pressure sensor, and a battery pack warning device; the acceleration sensor and the pressure sensor are installed on the battery pack, and monitor the collision of the battery pack to obtain collision monitoring data and air pressure monitoring data;

[0045] The battery pack warning device is used to determine whether the battery pack has a safety risk based on the collision monitoring data and the air pressure monitoring data, and to issue a safety warning to the battery pack when it is determined that the battery pack has a safety risk.

[0046] Optionally, the battery pack includes a frame and a plurality of battery cells mounted on the frame, and the acceleration sensor is mounted on the frame.

[0047] Optionally, the battery pack further includes a lower base plate, and the acceleration sensors are respectively located at the center of the lower base plate.

[0048] Optionally, the battery pack warning system further includes a pressure sensor, which is disposed inside the battery pack.

[0049] Optionally, the pressure sensor is disposed at the center of the battery pack, and the pressure sensor is mounted on the frame.

[0050] A battery pack warning device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. The device is characterized in that the processor implements the steps of the above-mentioned battery pack warning method when executing the computer program.

[0051] A readable storage medium is provided, which stores a computer program, and is characterized in that when the computer program is executed by a processor, the steps of the above-mentioned battery pack early warning method are implemented.

[0052] In one solution provided by the above-mentioned battery pack warning method, system, device and storage medium, the collision situation of the battery pack is monitored by the acceleration sensor and pressure sensor on the battery pack to obtain collision monitoring data and air pressure monitoring data, and then it is determined whether the battery pack has a safety risk based on the collision monitoring data and air pressure monitoring data. If the battery pack has a safety risk, a safety warning is issued to the battery pack; in the present invention, by installing an acceleration sensor and a pressure sensor on the battery pack to monitor the collision situation, a safety warning is issued to the battery pack when there is a safety risk in the battery pack, which can reduce the probability of the battery pack being undetected after a collision, and accurately and timely issue a safety warning based on the collision situation of the battery pack during the vehicle's driving, thereby reducing the fire, spontaneous combustion, etc. that may occur if the vehicle continues to be used after the battery pack is bumped without finding any abnormality, thereby reducing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0054] Figure 1 This is a structural diagram of a battery pack early warning system according to an embodiment of the present invention;

[0055] Figure 2 This is a flow chart of a battery pack early warning method according to an embodiment of the present invention;

[0056] Figure 3 yes Figure 2 A schematic diagram of an implementation flow of step S20;

[0057] Figure 4 yes Figure 2 A schematic diagram of an implementation flow of step S30;

[0058] Figure 5 This is a structural diagram of a battery pack early warning device according to an embodiment of the present invention;

[0059] Figure 6 2 is another structural diagram of a battery pack early warning device in one embodiment of the present invention. DETAILED DESCRIPTION

[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0061] The battery pack warning method provided by the embodiment of the present invention can be applied in the following situations: Figure 1In the battery pack warning system, the battery pack warning system includes a battery pack, an acceleration sensor, a pressure sensor, and a battery pack warning device. The acceleration sensor and the pressure sensor are installed on the battery pack, and monitor the collision situation of the battery pack to obtain collision monitoring data and air pressure monitoring data; the battery pack warning device communicates with the acceleration sensor and the pressure sensor, and is used to monitor the collision situation of the battery pack through the acceleration sensor to obtain collision monitoring data and air pressure monitoring data, and determine whether the battery pack poses a safety risk based on the collision monitoring data and air pressure monitoring data. If it is determined that the battery pack poses a safety risk, a safety warning is issued to the battery pack. In this embodiment, by installing an acceleration sensor on the battery pack to monitor the collision situation, a safety warning is issued to the battery pack when there is a safety risk. This can reduce the probability of the battery pack being undetected after a collision, accurately and timely issue a safety warning based on the collision situation of the battery pack during vehicle driving, and reduce the possibility of fire, spontaneous combustion, etc. that may occur if the vehicle continues to be used without discovering any abnormality after the battery pack is bumped, thereby reducing safety hazards.

[0062] The battery pack warning device can be a controller installed inside or outside the battery pack, or other controller on the vehicle, without the need for additional hardware. After the battery pack warning device determines that the battery pack presents a safety risk, it issues a battery pack risk warning to the user through the vehicle's instrument panel, voice system, or lighting system, allowing the user to promptly notify the user if the battery pack is bumped. This reduces the risk of fire or spontaneous combustion that may occur if the user continues to use the vehicle without noticing the abnormality after the battery pack is bumped, thereby reducing safety hazards. In other embodiments, the battery pack warning device can also be equipped with relevant warning structures, such as a buzzer, warning indicator light, etc.

[0063] In one embodiment, a battery pack includes a frame and a plurality of battery cells mounted on the frame, and an acceleration sensor is mounted on the frame. The acceleration sensor should be securely mounted on the (metal) frame of the battery pack, and the mounting state should meet certain dynamic stiffness requirements to prevent vibration from the vehicle during driving from interfering with the acceleration signal. The battery pack further includes an upper base plate, a lower base plate, and side plates, which are mounted on the frame. The plurality of battery cells are disposed in a cavity enclosed by the upper base plate, the lower base plate, and the side plates. The acceleration sensor is located at the center of the lower base plate to improve the accuracy of acceleration monitoring, thereby obtaining accurate collision monitoring data. 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 accelerometer 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. Acceleration monitoring is performed from various positions, reducing the possibility of inaccurate monitoring due to a single acceleration sensor, increasing collision monitoring accuracy, and thereby reducing safety hazards such as fire caused by untimely detection of battery pack collisions. In other embodiments, if the battery pack is small, the number of some acceleration sensors may be reduced.

[0064] The pressure sensor is installed within the battery pack to monitor changes in the battery pack's air pressure, thereby improving the safety of the battery pack. In one embodiment, the pressure sensor can be located in the center of the battery pack to improve its accuracy in monitoring the battery pack's air pressure. Furthermore, the pressure sensor is mounted on a frame to prevent vibrations from the vehicle during driving from interfering with the acceleration signal, further increasing the accuracy of the battery pack's air pressure monitoring.

[0065] In one embodiment, if Figure 2 As shown, a battery pack early warning method is provided, which is applied in Figure 1 The server in the example is used as an example, and the steps are as follows:

[0066] S10: The collision condition of the battery pack is monitored by the acceleration sensor and the pressure sensor on the battery pack to obtain collision monitoring data and air pressure monitoring data.

[0067] During vehicle operation and other vehicle use, the battery pack warning device monitors the battery pack's collisions using an accelerometer mounted on the battery pack and a pressure sensor mounted inside the battery pack. This device generates collision monitoring data from the accelerometer and air pressure monitoring data from the pressure sensor. The accelerometer is a three-axis accelerometer, measuring in the X, Y, and Z directions. The collision monitoring data represents the acceleration values ​​of the accelerometer at different times, with each value including acceleration values ​​in the X, Y, and Z directions.

[0068] S20: Determine whether the battery pack has a safety risk based on the collision monitoring data and the air pressure monitoring data.

[0069] After receiving the collision monitoring data, the battery pack warning device determines whether the battery pack poses a safety risk based on the collision monitoring data and the air pressure monitoring data. If the collision monitoring data indicates that the acceleration value in a certain direction exceeds a certain acceleration threshold, the battery pack is determined to have collided, indicating that the battery pack may pose a safety risk. Alternatively, if the air pressure monitoring data indicates that the air pressure change within the battery pack exceeds a certain amount, indicating that the battery pack may have been damaged due to the collision, the battery pack is determined to pose a safety risk.

[0070] Among them, it is also possible to determine whether there is a safety risk in the battery pack based on the vehicle status, collision monitoring data and air pressure monitoring data:

[0071] When the vehicle is stationary, if the acceleration sensor's acceleration value in any direction exceeds a certain threshold (such as 0 or 1), the battery pack is determined to have been in a collision, indicating a potential safety risk. Otherwise, the battery pack does not pose a safety risk. When the vehicle is in motion, if the acceleration sensor's acceleration value in the direction not traveling exceeds a certain threshold, the battery pack is determined to have been in a collision, indicating a potential safety risk. If the acceleration sensor's acceleration value in the direction not traveling is less than or equal to a certain threshold, the battery pack has not been in a collision. However, if the air pressure monitoring data indicates that the air pressure within the battery pack has changed by more than a certain amount, this indicates possible damage to the battery pack or a change in air pressure due to thermal effects, posing a safety risk. For example, if the Y direction is the vehicle's travel direction, if the acceleration sensor's acceleration value in the X or Z direction exceeds a certain threshold, the battery pack is determined to have been in a collision, indicating a potential safety risk. When the vehicle is in motion, if the acceleration sensor's acceleration value in the direction traveling is greater than the vehicle's travel acceleration, the battery pack is determined to have been in a collision, indicating a potential safety risk. In any state of the vehicle, if the air pressure change in the battery pack exceeds a certain amount as determined by the air pressure monitoring data, it is determined that there is a safety risk to the battery pack.

[0072] S30: If there is a safety risk in the battery pack, a safety warning is issued for the battery pack.

[0073] After determining whether the battery pack presents a safety risk based on the collision monitoring data and the air pressure monitoring data, if it is determined that the battery pack presents a safety risk, the battery pack warning device issues a safety warning to the battery pack.

[0074] The battery pack warning device can be connected to the vehicle's instrument panel, voice system, and lighting system. Upon determining that the battery pack presents a safety risk, the device sends a warning command to at least one of the instrument panel, voice system, and lighting system. This warning is then sent via a text warning on the instrument panel, an audible warning via the voice system, or a light warning via the lighting system. This alerts the user (e.g., the driver) of the potential safety hazard and promptly notifies the user (e.g., the driver) of the collision. This allows the user to promptly check the battery pack for fire hazards, thereby improving vehicle safety. In other embodiments, the battery pack warning device can also be equipped with additional warning mechanisms, such as a buzzer or warning indicator light. Upon determining that the battery pack presents a safety risk, the device controls the buzzer to issue an audible warning and the warning indicator light to issue a light warning.

[0075] In this embodiment, the collision condition of the battery pack is monitored by an acceleration sensor and a pressure sensor on the battery pack to obtain collision monitoring data and air pressure monitoring data. The collision monitoring data and air pressure monitoring data are then used to determine whether the battery pack presents a safety risk. If the battery pack presents a safety risk, a safety warning is issued for the battery pack. By installing acceleration sensors and pressure sensors on the battery pack to monitor collision conditions, the sensitivity of the acceleration sensors is utilized to accurately monitor collision risks. On this basis, the pressure sensor is used to detect the battery pack pressure, thereby issuing a safety warning to the battery pack when a safety risk exists. This reduces the probability of the battery pack remaining undetected after a collision, accurately and promptly issuing safety warnings based on the collision condition of the battery pack during vehicle operation, and reduces potential fires and spontaneous combustion that may occur if the vehicle continues to use the battery pack after a collision without detecting any abnormality, thereby reducing safety hazards.

[0076] In one embodiment, if Figure 3 As shown, in step S20, determining whether the battery pack has a safety risk based on the collision monitoring data and the air pressure monitoring data specifically includes the following steps:

[0077] S21: Determine whether the acceleration value in the non-travel direction in the collision monitoring data is greater than a third preset acceleration;

[0078] S22: If the acceleration value in the non-driving direction in the collision monitoring data is greater than a third preset acceleration, it is determined that there is a safety risk in the battery pack.

[0079] After obtaining the collision monitoring data, a determination is made as to whether the acceleration value in the non-driving direction (e.g., X or Z) in the collision monitoring data is greater than a third preset acceleration. If the acceleration value in the non-driving direction in the collision monitoring data is greater than the third preset acceleration, a determination is made that the battery pack presents a safety risk. If the acceleration value in the non-driving direction in the collision monitoring data is less than or equal to the third preset acceleration, a determination can be made that the battery pack presents no safety risk. Alternatively, a determination as to whether the battery pack presents a safety risk can be made based on other factors. For example, conventional determinations as to whether the battery pack presents a safety risk are based on the battery pack temperature or battery pack current detected by the battery management system of the battery pack. If the battery pack temperature is greater than a certain temperature threshold or the battery pack current is greater than a certain current threshold, indicating that the battery pack may be experiencing thermal runaway, a determination is made as to whether the battery pack presents a safety risk.

[0080] The third preset acceleration may be an acceleration value much smaller than the first preset acceleration, such as 0g, 1g or 2g.

[0081] In this embodiment, it is directly determined whether the acceleration value in the non-driving direction in the collision monitoring data is greater than the third preset acceleration. If the acceleration value in the non-driving direction in the collision monitoring data is greater than the third preset acceleration, it is determined that there is a safety risk in the battery pack. The specific process of determining whether there is a safety risk in the battery pack based on the collision monitoring data is clarified, and the safety risk is determined directly based on the acceleration value in the non-driving direction, which is simple and convenient.

[0082] In one embodiment, after step S21, that is, after determining whether the acceleration value in the non-travel direction in the collision monitoring data is greater than the third preset acceleration, the method further specifically includes the following steps:

[0083] S23: If the acceleration value in the non-driving direction in the collision monitoring data is less than or equal to a third preset acceleration, determining whether the air pressure change of the battery pack meets a preset condition based on the air pressure monitoring data;

[0084] After determining whether the acceleration value in the non-driving direction in the collision monitoring data is greater than the third preset acceleration, if the acceleration value in the non-driving direction in the collision monitoring data is less than or equal to the third preset acceleration, it means that the battery pack has not collided or the degree of collision is extremely low and can be ignored, then obtain the air pressure monitoring data obtained by monitoring the air pressure of the battery pack through the pressure sensor in the battery pack, and determine whether the air pressure change of the battery pack meets the preset conditions based on the air pressure monitoring data monitored by the pressure sensor in the battery pack.

[0085] S24: If the change in the gas pressure of the battery pack meets the preset conditions, it is determined that the airtightness of the battery pack has failed, and it is determined that there is a safety risk in the battery pack.

[0086] After determining whether the air pressure change of the battery pack meets the preset conditions based on the air pressure monitoring data obtained by the pressure sensor in the battery pack, if the air pressure change of the battery pack meets the preset conditions, it means that the air pressure change inside the battery pack is large, then it is determined that the air tightness of the battery pack has failed, and it is determined that there is a safety risk in the battery pack; if the air pressure change of the battery pack does not meet the preset conditions, it means that the air pressure change inside the battery pack is small, which may be caused by the air pressure change caused by the operating temperature of the battery pack, then it is determined that the air tightness of the battery pack is normal, and it can be determined that there is no safety risk in the battery pack.

[0087] In this embodiment, after determining whether the acceleration value in the non-driving direction in the collision monitoring data is greater than the third preset acceleration, if the acceleration value in the non-driving direction in the collision monitoring data is less than or equal to the third preset acceleration, then the air pressure monitoring data obtained by monitoring the pressure sensor in the battery pack is used to determine whether the air pressure change of the battery pack meets the preset conditions. If the air pressure change of the battery pack meets the preset conditions, it is determined that the air tightness of the battery pack has failed, and it is determined that there is a safety risk in the battery pack. After determining through the acceleration sensor that the battery pack has not collided, the pressure sensor is also used to monitor the pressure of the battery pack, and the pressure and acceleration impact are monitored at the same time to improve the monitoring accuracy, thereby reducing the safety hazards of the battery pack caused by bumps and sealing failure, and further improving the safety of the battery pack. In addition, since the acceleration change of the battery pack changes first with the air pressure change of the battery pack when it is collided, judging the collision monitoring data first and then judging the air pressure monitoring data can speed up the efficiency of safety risk discovery, and thus improve the efficiency of risk warning.

[0088] In other embodiments, it is also possible to first determine whether the air pressure change of the battery pack meets the preset conditions based on the air pressure monitoring data. If the air pressure change of the battery pack meets the preset conditions, it is determined that the airtightness of the battery pack has failed, and it is determined that there is a safety risk in the battery pack; if the air pressure change of the battery pack does not meet the preset conditions, it is determined whether the acceleration value in the non-driving direction in the collision monitoring data is greater than a third preset acceleration. If the acceleration value in the non-driving direction in the collision monitoring data is greater than the third preset acceleration, it is determined that there is a safety risk in the battery pack; if the acceleration value in the non-driving direction in the collision monitoring data is less than or equal to the third preset acceleration, it is determined that there is no safety risk in the battery pack.

[0089] In one embodiment, step S23, i.e., determining whether the pressure change of the battery pack meets a preset condition, specifically includes the following steps:

[0090] S231: Determine the rate of change of the battery pack's air pressure per unit time based on the air pressure monitoring data, which is recorded as the battery pack's air pressure change rate.

[0091] In this embodiment, the air pressure monitoring data is the air pressure value of the battery pack at different times. The rate of change of the air pressure of the battery pack per unit time (per second) is determined based on the air pressure monitoring data and recorded as the air pressure change rate of the battery pack.

[0092] S232: Determine whether the air pressure change rate is greater than a preset air pressure change rate.

[0093] After obtaining the pressure change rate of the battery pack, it is determined whether the pressure change rate is greater than a preset pressure change rate. For example, if the preset pressure change rate is 5% / s, it is determined whether the pressure change rate of the battery pack is greater than 5% / s.

[0094] S233: If the air pressure change rate is greater than the preset air pressure change rate, it is determined that the air pressure change of the battery pack meets the preset condition.

[0095] After determining whether the air pressure change rate is greater than the preset air pressure change rate, if the air pressure change rate is greater than the preset air pressure change rate, it means that the air pressure inside the battery pack has suddenly changed, and the battery pack shell has been ruptured or severely squeezed. Then it is determined that the air pressure change of the battery pack meets the preset conditions and the air tightness of the battery pack has failed.

[0096] In this embodiment, the rate of change of the battery pack's air pressure per unit time is determined based on the air pressure monitoring data, which is recorded as the battery pack's air pressure change rate, and it is determined whether the air pressure change rate is greater than the preset air pressure change rate. If the air pressure change rate is greater than the preset air pressure change rate, it is determined that the battery pack's air pressure change meets the preset conditions. The steps for determining whether the battery pack's air pressure change meets the preset conditions are clarified, which provides a basis for subsequent safety warnings.

[0097] In one embodiment, after step S232, that is, after determining whether the air pressure change rate is greater than a preset air pressure change rate, the method specifically includes the following steps:

[0098] S234: If the air pressure change rate is less than or equal to the preset air pressure change rate, determine the change rate of the air pressure of the battery pack within the preset time period, and record it as the air pressure change rate of the battery pack.

[0099] After determining whether the air pressure change rate is greater than a preset air pressure change rate, if the air pressure change rate is less than or equal to the preset air pressure change rate, it is necessary to determine the rate of change of the battery pack air pressure within a preset time period, which is recorded as the battery pack air pressure change rate. The preset time period may be 30 seconds. In other embodiments, the preset time period may be other time periods, such as 25 seconds, 35 seconds, or 40 seconds.

[0100] S235: Determine whether the air pressure change rate is greater than a preset change rate.

[0101] After obtaining the pressure change rate of the battery pack, it is determined whether the pressure change rate is greater than a preset change rate, which may be 10%.

[0102] S236: If the air pressure change rate is greater than the preset change rate, it is determined that the air pressure change of the battery pack meets the preset condition.

[0103] After determining whether the air pressure change rate is greater than a preset change rate, if the air pressure change rate is greater than the preset change rate, it indicates that the battery pack air pressure changes slowly but changes significantly in a short period of time, and the shell may have cracks causing leakage. In this case, it is determined that the battery pack air pressure change meets the preset conditions and the battery pack airtightness has failed. If the air pressure change rate is less than or equal to the preset change rate, it indicates that the battery pack air pressure changes slowly and changes slightly in a short period of time. The battery pack air pressure change is caused by the battery pack operating temperature. It is determined that the battery pack air pressure change does not meet the preset conditions and the battery pack airtightness is normal.

[0104] In this embodiment, after determining whether the air pressure change rate is greater than the preset air pressure change rate, if the air pressure change rate is less than or equal to the preset air pressure change rate, the change rate of the air pressure of the battery pack within the preset time period is determined, recorded as the air pressure change rate of the battery pack, and it is determined whether the air pressure change rate is greater than the preset change rate. If the air pressure change rate is greater than the preset change rate, it is determined that the air pressure change of the battery pack meets the preset conditions. After determining whether the air pressure change rate is greater than the preset air pressure change rate, a safety judgment is made based on the change rate of the air pressure of the battery pack within the preset time period. This is simple and effective, and ensures the air tightness of the battery pack from another dimension.

[0105] In one embodiment, if Figure 4 As shown, in step S30, a safety warning is issued to the battery pack, which specifically includes the following steps:

[0106] S31: Determine the risk level of the battery pack based on the collision monitoring data and the air pressure monitoring data.

[0107] After obtaining the collision monitoring data, the battery pack warning device determines the battery pack's risk level based on the collision monitoring data and the air pressure monitoring data. The risk level corresponding to the acceleration change can be determined based on the collision monitoring data, and the risk level corresponding to the air pressure change can be determined based on the air pressure monitoring data. The higher risk level of the two, the one corresponding to the acceleration change or the one corresponding to the air pressure change, is then selected as the battery pack's risk level.

[0108] For example, the acceleration values ​​at different moments in the collision monitoring data are determined, and the maximum acceleration value is recorded as the target acceleration. The risk level is determined according to the magnitude of the target acceleration and the preset acceleration classification range. The larger the target acceleration, the higher the risk level. For example, the risk level includes a first risk level, a second risk level, and a third risk level, with risk levels decreasing in order, and the acceleration classification range includes a first range, a second range, and a third range, with acceleration ranges increasing in order. The first range, the second range, and the third range correspond to the third risk level, the second risk level, and the first risk level, respectively. The air pressure change rate of the battery pack is determined based on the air pressure monitoring data. The risk level is determined according to the magnitude of the air pressure change rate and the preset air pressure change rate classification range. The larger the air pressure change rate, the higher the risk level if the air pressure change rate of the battery pack is greater than a first threshold. For example, the risk level includes a first risk level, a second risk level, and a third risk level, with risk levels decreasing in order, and the air pressure change rate classification range includes a first range, a second range, and a third range, with air pressure change rate ranges increasing in order. The first range, the second range, and the third range correspond to the third risk level, the second risk level, and the first risk level, respectively. After determining the risk level corresponding to the acceleration change based on the collision monitoring data, and determining the risk level corresponding to the air pressure change based on the pressure monitoring data, the higher risk level of the two is then used as the risk level of the battery pack.

[0109] In this embodiment, the risk levels include a first risk level, a second risk level, and a third risk level with risk levels increasing in sequence, and the grading ranges include a first range, a second range, and a third range with acceleration ranges or air pressure change rates increasing in sequence. This is only for illustrative purposes. In other embodiments, the risk level may be other, and the grading range may be other ranges, which will not be repeated here.

[0110] S32: Provide graded safety warnings for battery packs based on risk levels.

[0111] After determining the risk level of the battery pack based on the collision monitoring data, the battery pack warning device performs graded safety warnings on the battery pack according to the risk level, that is, different alarm strategies are implemented according to different risk levels.

[0112] For example, the risk level includes a first risk level, a second risk level and a third risk level in descending order; after determining the risk level of the battery pack based on the collision monitoring data and the air pressure monitoring data, if the risk level of the battery pack is determined to be the first risk level, it means that the risk level is the lowest, the collision generated is a mild collision, and the battery pack may have safety hazards. At this time, only a dashboard warning can be performed, that is, a text or image risk warning is performed through the dashboard; if the risk level of the battery pack is determined to be the second risk level, it means that the risk level is medium, the collision generated is a moderate collision, and the battery pack may have safety hazards. At this time, only a dashboard warning can be performed, or a dashboard warning and a voice warning (or light warning) can be performed at the same time; if the risk level of the battery pack is determined to be the first risk level, it means that the risk level is the highest, the collision generated is a severe collision, and the battery pack may have safety hazards. At this time, a dashboard warning, a voice warning, and a light warning can be performed at the same time. After determining the risk level of the battery pack based on the collision monitoring data and the air pressure monitoring data, a warning message may be generated based on the risk level. When a graded safety warning is issued for the battery pack, the warning message may be played via a dashboard warning and / or a voice warning to alert relevant users of the battery pack's collision situation. In other embodiments, after determining the risk level of the battery pack based on the collision monitoring data and the air pressure monitoring data, a warning message may be generated based on the risk level and the location of the acceleration sensor that detected the collision situation. When a graded safety warning is issued for the battery pack, the warning message may be played via a dashboard warning and / or a voice warning to alert relevant users of the battery pack's collision situation and to quickly locate the location of the battery pack's collision based on the prompts.

[0113] In this embodiment, the risk level of the battery pack is determined based on the collision monitoring data and the air pressure monitoring data, and a graded safety warning is given to the battery pack according to the risk level. The steps for providing safety warnings to the battery pack are refined, and different alarm strategies are implemented according to the different risk levels of the battery pack. This can avoid false alarms caused by minor scratches and thus cause panic, reduce the interference rate, and increase the attention paid to serious collisions, thereby reducing the risk of property damage caused by possible fire hazards.

[0114] In one embodiment, step S31, i.e., determining the risk level of the battery pack based on the collision monitoring data and the air pressure monitoring data, specifically includes the following steps:

[0115] S311: Determine whether the air tightness of the battery pack is normal based on the air pressure monitoring data.

[0116] In this embodiment, a pressure sensor is provided in the battery pack to monitor the air pressure change of the battery pack through the pressure sensor in the battery pack to obtain air pressure monitoring data of the battery pack by the pressure sensor.

[0117] After obtaining the air pressure monitoring data obtained by the pressure sensor inside the battery pack to monitor the air pressure of the battery pack, the air tightness of the battery pack is determined based on the air pressure monitoring data of the pressure sensor. If the air pressure monitoring data determines that the air pressure changes within the battery pack are small, it indicates that the battery pack air tightness is normal and the air pressure changes are caused by the operating temperature of the battery pack. There is no safety hazard at present. If the air pressure monitoring data determines that the air pressure changes within the battery pack are large, it indicates that the battery pack shell may have cracks, the battery pack air tightness has failed, and external objects (such as water and debris) can easily enter the battery pack, causing the battery pack to short circuit and fire, posing a significant safety risk.

[0118] Among them, determining whether the air tightness of the battery pack is normal based on the air pressure monitoring data refers to the above description, and determining the air pressure change of the battery pack based on the air pressure monitoring data, and then determining whether the air pressure change of the battery pack meets the preset conditions. If the air pressure change of the battery pack meets the preset conditions, it is determined that the air tightness of the battery pack has failed. If the air pressure change of the battery pack does not meet the preset conditions, it is determined that the air tightness of the battery pack is normal.

[0119] S312: If the airtightness of the battery pack is normal, determine the risk level of the battery pack based on the collision monitoring data.

[0120] After determining whether the air tightness of the battery pack is normal based on the air pressure monitoring data, if the air tightness of the battery pack is normal, the safety risk caused by abnormal air tightness of the battery pack (air tightness failure) can be eliminated, and the risk level of the battery pack can be directly determined based on the collision monitoring data, that is, the risk level of the battery pack can be directly determined based on the magnitude of the acceleration value in the collision monitoring data.

[0121] S313: If the airtightness of the battery pack fails, determine the risk level of the battery pack as the first risk level.

[0122] After determining whether the battery pack's airtightness is normal based on air pressure monitoring data, if the battery pack's airtightness fails, external objects (such as water or debris) can easily enter the battery pack, causing a short circuit and fire, posing a significant safety risk. The battery pack's risk level is then determined to be Level 1, the highest risk level.

[0123] In this embodiment, the air pressure monitoring data obtained by monitoring the air pressure of the battery pack using a pressure sensor within the battery pack is used to determine whether the battery pack's airtightness is normal. If the battery pack's airtightness is normal, the battery pack's risk level is determined based on the collision monitoring data. If the battery pack's airtightness fails, the battery pack's risk level is determined to be the first risk level. This clarifies the specific steps for determining the battery pack's risk level based on the collision monitoring data. In this embodiment, the risk level is determined based on the monitoring data from the acceleration sensor and the pressure sensor. Both the acceleration and air pressure of the battery pack are considered when making the risk assessment, resulting in a more accurate risk assessment result. Furthermore, if the battery pack's airtightness fails, the battery pack's risk level is determined to be the highest risk level, the first risk level, and a corresponding alarm strategy is implemented, allowing relevant users to directly be informed of the high risk of the battery pack.

[0124] In one embodiment, step S311, i.e., determining the risk level of the battery pack based on the collision monitoring data, specifically includes the following steps:

[0125] S301: Acquire the state of the vehicle and obtain the acceleration values ​​in different directions of the collision monitoring data, where the different directions include the X direction, the Y direction, and the Z direction.

[0126] The acceleration sensor in this embodiment is a three-dimensional acceleration sensor. The collision monitoring data detected by the acceleration sensor includes acceleration values ​​in different directions, including the X, Y, and Z directions. That is, the collision monitoring data detected by the acceleration sensor includes acceleration values ​​in the X, Y, and Z directions. The Y direction is the vehicle's travel direction, the Z direction is the vehicle's height, and the X direction is perpendicular to the Y and Z directions. The vehicle's state includes a moving state and a stationary state.

[0127] S302: When the vehicle is in a driving state, determining the collision level of the battery pack in the X direction according to the acceleration value in the X direction, and determining the collision level of the battery pack in the Z direction according to the acceleration value in the Z direction.

[0128] When the vehicle is in driving mode, the Y direction is the vehicle's driving direction, so the acceleration in the Y direction is related to the vehicle's acceleration. The acceleration in the Y direction changes significantly. Therefore, the acceleration value in the Y direction can be ignored, and only the acceleration value changes in the X and Z directions are considered. The collision level of the battery pack in the X direction is determined based on the acceleration value in the X direction, and the collision level of the battery pack in the Z direction is determined based on the acceleration value in the Z direction.

[0129] Since the battery pack is generally installed at the bottom of the vehicle, a collision at the bottom of the vehicle is very likely to directly impact the battery pack, and the battery pack may be severely damaged by an impact in the Z direction. However, an impact in the X or Y direction is transmitted to the battery pack through the vehicle body, reducing the impact force received by the battery pack and potentially causing less damage. Therefore, when the acceleration value in the X direction (or Y direction) is the same as the acceleration value in the Z direction, the impact degree in the Z direction is higher than the impact degree in the X direction (or Y direction), that is, the collision level in the Z direction is higher than the collision level in the X direction (or Y direction).

[0130] S303: Determine a risk level of the battery pack according to the collision level of the battery pack in the X direction and the collision level in the Z direction.

[0131] After determining the collision level of the battery pack in the X direction based on the acceleration value in the X direction and determining the collision level of the battery pack in the Z direction based on the acceleration value in the Z direction, when the vehicle is in the driving state, the risk level of the battery pack is determined based on the collision level of the battery pack in the X direction and the collision level in the Z direction.

[0132] In other embodiments, when the vehicle is in a driving state, the collision level of the battery pack in the X direction can be determined based on the acceleration value in the X direction, and the collision level of the battery pack in the Z direction can be determined based on the acceleration value in the Z direction. The collision level of the battery pack in the Y direction can be determined based on the difference between the acceleration value in the Y direction and the vehicle acceleration. The risk level of the battery pack can then be determined based on the collision level of the battery pack in the X direction, the collision level in the Z direction, and the collision level in the Y direction.

[0133] After obtaining the vehicle status, when the vehicle is stationary, the acceleration value of the acceleration sensor on the battery pack in the Y direction is not affected by the vehicle acceleration. Therefore, when the vehicle is stationary, it is necessary to determine the battery pack's collision level in the X direction based on the acceleration value in the X direction, determine the battery pack's collision level in the Z direction based on the acceleration value in the Z direction, and determine the battery pack's collision level in the Y direction based on the acceleration value in the Y direction. Then, based on the battery pack's collision level in the X direction, the collision level in the Z direction, and the collision level in the Y direction, the risk level of the battery pack is determined.

[0134] Among the collision levels of the battery pack in each direction, the highest collision level is selected as the target collision level, and then the risk level corresponding to the target collision level is determined as the risk level of the battery pack. For example, the collision levels include a first collision level (severe collision), a second collision level (moderate collision), and a third collision level (mild collision) in descending order of collision severity. Correspondingly, the risk levels include a first risk level (high risk), a second risk level (lower than medium), and a third risk level (low risk) in descending order of collision severity. The risk level corresponding to the first collision level is the first risk level, the risk level corresponding to the second collision level is the second risk level, and the risk level corresponding to the third collision level is the third risk level.

[0135] In addition, when the vehicle is in a driving state, the acceleration value with the largest value in the X and Z directions can be recorded as the target acceleration value. That is, the acceleration value with the largest value in both the X and Z directions is determined and recorded as the target acceleration value. Then, the risk level of the battery pack is determined based on the size of the target acceleration value. The larger the target acceleration value, the higher the risk level.

[0136] In this embodiment, the vehicle state and acceleration values ​​in different directions (including X, Y, and Z) from the collision monitoring data are obtained. When the vehicle is in a driving state, the collision level of the battery pack in the X direction is determined based on the acceleration value in the X direction, and the collision level of the battery pack in the Z direction is determined based on the acceleration value in the Z direction. The risk level of the battery pack is determined based on the collision levels in the X and Z directions. This clarifies the specific steps for determining the risk level of the battery pack based on the collision monitoring data. When the vehicle is in a driving state, the acceleration value in the Y direction (i.e., the acceleration value in the driving direction) is not considered, and the collision level of the battery pack in the X direction is determined based only on the acceleration value in the X direction, and the collision level of the battery pack in the Z direction is determined based on the acceleration value in the Z direction. The risk level of the battery pack is then determined based on the collision levels in the X and Z directions. This is simple and convenient, reduces the amount of data processing in the Y direction, improves the efficiency of risk level determination, and thus improves the efficiency of subsequent early warning.

[0137] In one embodiment, step S302, i.e., determining the collision level of the battery pack in the X direction according to the acceleration value in the X direction, specifically includes the following steps:

[0138] S3021: Determine whether the acceleration value in the X direction is less than a first preset acceleration;

[0139] S3022: If the acceleration value in the X direction is greater than or equal to the first preset acceleration, determining that the collision level of the battery pack in the X direction is the first collision level;

[0140] S30213: If the acceleration value in the X direction is less than the first preset acceleration, determine that the collision level of the battery pack in the X direction is the second collision level, and the collision degree of the first collision level is higher than the second collision level.

[0141] When the vehicle is in motion or stationary state, the X-direction collision level of the battery pack is determined based on the X-direction acceleration value. It is necessary to determine whether the X-direction acceleration value is less than a first preset acceleration. If the X-direction acceleration value is greater than or equal to the first preset acceleration, the X-direction collision level of the battery pack is determined to be the first collision level. If the X-direction acceleration value is less than the first preset acceleration, the X-direction collision level of the battery pack is determined to be the second collision level. The first collision level has a higher collision severity than the second collision level.

[0142] The first preset acceleration may be 20g. When the first preset acceleration is 20g, the acceleration value of the acceleration sensor in the X direction and the corresponding collision level are shown in Table 1:

[0143] Table 1

[0144]

[0145] Among them, when the vehicle is in a stationary state, the collision level of the battery pack in the Y direction is determined based on the acceleration value in the Y direction. The method of determining the collision level in the X direction is the same, that is, determining whether the acceleration value in the Y direction is less than a first preset acceleration. If the acceleration value in the Y direction is greater than or equal to the first preset acceleration, the collision level of the battery pack in the X direction is determined to be the first collision level; if the acceleration value in the Y direction is less than the first preset acceleration, the collision level of the battery pack in the Y direction is determined to be the second collision level.

[0146] In this embodiment, by determining whether the acceleration value in the X direction is less than a first preset acceleration, if the acceleration value in the X direction is greater than or equal to the first preset acceleration, the collision level of the battery pack in the X direction is determined to be the first collision level; if the acceleration value in the X direction is less than the first preset acceleration, the collision level of the battery pack in the X direction is determined to be the second collision level. The first collision level has a higher collision severity than the second collision level. This clarifies the specific process of determining the collision level of the battery pack in the X direction based on the acceleration value in the X direction, providing a basis for subsequently determining the risk level based on the collision level of the battery pack in the X direction.

[0147] In one embodiment, step S302, i.e., determining the collision level of the battery pack in the Z direction according to the acceleration value in the Z direction, specifically includes the following steps:

[0148] S3014: Determine whether the acceleration value in the Z direction is less than a second preset acceleration;

[0149] S3015: If the acceleration value in the Z direction is greater than or equal to the second preset acceleration, determining that the collision level of the battery pack in the Z direction is the first collision level;

[0150] S3016: If the acceleration value in the Z direction is less than the second preset acceleration, determine whether the acceleration value in the Z direction is less than the first preset acceleration, and the second preset acceleration is greater than the first preset acceleration;

[0151] S3017: If the acceleration value in the Z direction is greater than or equal to the first preset acceleration, determining that the collision level of the battery pack in the Z direction is the second collision level;

[0152] S3018: If the acceleration value in the Z direction is less than the first preset acceleration, determine that the collision level of the battery pack in the Z direction is the third collision level.

[0153] When the vehicle is in motion or stationary, the Z-direction collision level of the battery pack is determined based on the acceleration value in the Z direction. It is necessary to determine whether the Z-direction acceleration value is less than a second preset acceleration. If the Z-direction acceleration value is greater than or equal to the second preset acceleration, the Z-direction collision level of the battery pack is determined to be the first collision level. If the Z-direction acceleration value is less than the second preset acceleration, it is determined whether the Z-direction acceleration value is less than the first preset acceleration. If the second preset acceleration value is greater than the first preset acceleration, the Z-direction collision level of the battery pack is determined to be the second collision level. If the Z-direction acceleration value is less than the first preset acceleration, the Z-direction collision level of the battery pack is determined to be the third collision level. The first, second, and third collision levels have decreasing collision severity.

[0154] The first preset acceleration may be 20g, and the second preset acceleration may be 40g. When the first preset acceleration is 20g and the second preset acceleration is 40g, the acceleration value of the acceleration sensor in the Z direction and the corresponding collision level are shown in Table 2:

[0155] Table 2

[0156]

[0157] In other embodiments, the first preset acceleration and the second preset acceleration may also be other values. For example, the first preset acceleration may be 22g, 25g, etc., and the second preset acceleration may be 41g, 43g, 45g, etc., which are not repeated here.

[0158] In this embodiment, by determining whether the acceleration value in the Z direction is less than the second preset acceleration, if the acceleration value in the Z direction is greater than or equal to the second preset acceleration, the collision level of the battery pack in the Z direction is determined to be the first collision level; if the acceleration value in the Z direction is less than the second preset acceleration, then determining whether the acceleration value in the Z direction is less than the first preset acceleration, the second preset acceleration is greater than the first preset acceleration, if the acceleration value in the Z direction is greater than or equal to the first preset acceleration, the collision level of the battery pack in the Z direction is determined to be the second collision level; if the acceleration value in the Z direction is less than the first preset acceleration, then determining the collision level of the battery pack in the Z direction is determined to be the third collision level. The collision degrees of the first collision level, the second collision level and the third collision level decrease in sequence. The specific steps for determining the collision level of the battery pack in the Z direction according to the acceleration value in the Z direction are clarified, which provides a basis for subsequently determining the risk level according to the collision level of the battery pack in the Z direction.

[0159] In other embodiments, the risk level can also be determined directly based on the magnitude of the acceleration values ​​in different directions. This is a direct and convenient method. For example, when the vehicle is in a driving state, the acceleration value with the largest value in the X direction and the Z direction can be recorded as the target acceleration value, that is, the acceleration value with the largest value in the X direction and the Z direction is determined as the target acceleration value, and then the risk level of the battery pack is determined based on the magnitude of the target acceleration value. The larger the target acceleration value, the higher the risk level. When the direction corresponding to the target acceleration is the X direction, determine whether the target acceleration is less than the first preset acceleration; if the target acceleration is greater than or equal to the first preset acceleration, determine the risk level of the battery pack to be the first risk level; if the target acceleration is less than the first preset acceleration, determine the risk level of the battery pack to be the second risk level. When the direction corresponding to the target acceleration is the Z direction, it is determined whether the target acceleration is less than the second preset acceleration; if the target acceleration is greater than or equal to the second preset acceleration, the risk level of the battery pack is determined to be the first risk level; if the target acceleration is less than the second preset acceleration, it is determined whether the target acceleration is less than the first preset acceleration, and the second preset acceleration is greater than the first preset acceleration; if the target acceleration is greater than or equal to the first preset acceleration, the risk level of the battery pack is determined to be the second risk level; if the target acceleration is less than the first preset acceleration, the risk level of the battery pack is determined to be the third risk level, with the first risk level, the second risk level, and the third risk level decreasing in order. In this embodiment, different risk level classification methods are set for acceleration values ​​in different directions to represent different risk levels, and then warnings are directly issued based on risk levels. This can effectively inform relevant personnel of the battery safety risk situation, reduce interference rates, increase attention to serious collisions, and reduce the risk of property damage caused by potential fire hazards.

[0160] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0161] In one embodiment, a battery pack warning device is provided, which corresponds to the battery pack warning method in the above embodiment. Figure 5 As shown, the battery pack warning device includes a monitoring module 501, a determination module 502, a C module and a warning module 503. The functional modules are described in detail as follows:

[0162] Monitoring module 501, used to monitor the collision of the battery pack through the acceleration sensor and pressure sensor on the battery pack to obtain collision monitoring data and air pressure monitoring data;

[0163] A determination module 502 is configured to determine whether the battery pack has a safety risk based on the collision monitoring data and the air pressure monitoring data;

[0164] The early warning module 503 is configured to issue a safety early warning to the battery pack if there is a safety risk to the battery pack.

[0165] Furthermore, the early warning module 503 is specifically configured to:

[0166] Determine the risk level of the battery pack based on collision monitoring data and air pressure monitoring data;

[0167] Provide graded safety warnings for battery packs based on risk levels.

[0168] Furthermore, the early warning module 503 is further configured to:

[0169] Determine whether the battery pack's air tightness is normal based on the air pressure monitoring data;

[0170] If the airtightness of the battery pack is normal, the risk level of the battery pack is determined based on the collision monitoring data.

[0171] Furthermore, after determining whether the air tightness of the battery pack is normal based on the air pressure monitoring data, the early warning module 503 is further configured to:

[0172] If the airtightness of the battery pack fails, the risk level of the battery pack is determined to be the first risk level.

[0173] Furthermore, the early warning module 503 is further configured to:

[0174] Obtain the vehicle status and the acceleration values ​​in different directions from the collision monitoring data, including the X direction, Y direction, and Z direction;

[0175] When the vehicle is in a driving state, the collision level of the battery pack in the X direction is determined based on the acceleration value in the X direction, and the collision level of the battery pack in the Z direction is determined based on the acceleration value in the Z direction;

[0176] The risk level of the battery pack is determined based on the collision level of the battery pack in the X direction and the collision level in the Z direction.

[0177] Furthermore, the early warning module 503 is further configured to:

[0178] Determining whether the acceleration value in the X direction is less than a first preset acceleration;

[0179] If the acceleration value in the X direction is greater than or equal to the first preset acceleration, determining that the collision level of the battery pack in the X direction is the first collision level;

[0180] If the acceleration value in the X direction is less than the first preset acceleration, the collision level of the battery pack in the X direction is determined to be the second collision level, and the collision degree of the first collision level is higher than that of the second collision level.

[0181] Furthermore, the early warning module 503 is further configured to:

[0182] Determining whether the acceleration value in the Z direction is less than a second preset acceleration;

[0183] If the acceleration value in the Z direction is greater than or equal to the second preset acceleration, the collision level of the battery pack in the Z direction is determined to be the first collision level;

[0184] If the acceleration value in the Z direction is less than the second preset acceleration, determining whether the acceleration value in the Z direction is less than the first preset acceleration, and the second preset acceleration is greater than the first preset acceleration;

[0185] If the acceleration value in the Z direction is greater than or equal to the first preset acceleration, determining that the collision level of the battery pack in the Z direction is the second collision level;

[0186] If the acceleration value in the Z direction is less than the first preset acceleration, the collision level of the battery pack in the Z direction is determined to be the third collision level, and the collision degrees of the first collision level, the second collision level and the third collision level decrease in sequence.

[0187] Furthermore, the determination module 502 is specifically configured to:

[0188] determining whether an acceleration value in a non-travel direction in the collision monitoring data is greater than a third preset acceleration;

[0189] If it is greater than a third preset acceleration, it is determined that there is a safety risk to the battery pack.

[0190] Furthermore, after determining whether the acceleration value in the non-driving direction in the collision monitoring data is greater than the third preset acceleration, the determination module 502 is further configured to:

[0191] If the acceleration is less than or equal to the third preset acceleration, determining whether the pressure change of the battery pack meets the preset condition according to the pressure monitoring data;

[0192] If the air pressure change of the battery pack meets the preset conditions, it is determined that the airtightness of the battery pack has failed and that there is a safety risk in the battery pack.

[0193] Furthermore, the determining module 502 is further configured to:

[0194] Determine the rate of change of the battery pack's air pressure per unit time based on the air pressure monitoring data, which is recorded as the battery pack's air pressure change rate;

[0195] determining whether the rate of change of the air pressure is greater than a preset rate of change of the air pressure;

[0196] If the air pressure change rate is greater than the preset air pressure change rate, it is determined that the air pressure change of the battery pack meets the preset condition.

[0197] Furthermore, after determining whether the air pressure change rate is greater than a preset air pressure change rate, the determination module 502 is further configured to:

[0198] If the air pressure change rate is less than or equal to the preset air pressure change rate, then the change rate of the air pressure of the battery pack within the preset time period is determined and recorded as the air pressure change rate of the battery pack;

[0199] Determining whether the rate of change of the air pressure is greater than a preset rate of change;

[0200] If the air pressure change rate is greater than the preset change rate, it is determined that the air pressure change of the battery pack meets the preset condition.

[0201] The specific definition of the battery pack warning device can be found in the definition of the battery pack warning method above and will not be repeated here. Each module in the above-mentioned battery pack warning device can be implemented in whole or in part through software, hardware, or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the corresponding operations of each of the above modules.

[0202] In one embodiment, Figure 6 As shown, a battery pack early warning device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following steps are implemented:

[0203] The collision condition of the battery pack is monitored by the acceleration sensor and pressure sensor on the battery pack to obtain collision monitoring data and air pressure monitoring data;

[0204] Determine whether the battery pack has safety risks based on collision monitoring data and air pressure monitoring data;

[0205] If there is a safety risk in the battery pack, a safety warning will be issued for the battery pack.

[0206] In one embodiment, a readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0207] The collision condition of the battery pack is monitored by the acceleration sensor and pressure sensor on the battery pack to obtain collision monitoring data and air pressure monitoring data;

[0208] Determine whether the battery pack has safety risks based on collision monitoring data and air pressure monitoring data;

[0209] If there is a safety risk in the battery pack, a safety warning will be issued for the battery pack.

[0210] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory.

[0211] Those skilled in the art will clearly understand that for the sake of convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0212] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A battery pack early warning method, characterized in that: include: The collision condition of the battery pack is monitored by an acceleration sensor and a pressure sensor on the battery pack to obtain collision monitoring data and air pressure monitoring data; determining whether the battery pack has a safety risk based on the collision monitoring data and the air pressure monitoring data; If there is a safety risk in the battery pack, a safety warning is issued for the battery pack; The determining whether the battery pack presents a safety risk based on the collision monitoring data and the air pressure monitoring data includes: when the vehicle is in a driving state, determining whether the acceleration value in the non-driving direction in the collision monitoring data is greater than a third preset acceleration; if it is greater than the third preset acceleration, determining that the battery pack presents a safety risk; if it is less than or equal to the third preset acceleration, determining whether the air pressure change of the battery pack meets a preset condition based on the air pressure monitoring data; the preset condition includes that the rate of change of air pressure per unit time is greater than a preset air pressure change rate, or the rate of change of air pressure within a preset time length is greater than a preset change rate; if the air pressure change of the battery pack meets the preset condition, determining that the air tightness of the battery pack has failed, and determining that the battery pack presents a safety risk.

2. The battery pack early warning method according to claim 1, characterized in that: The providing a safety warning for the battery pack includes: determining a risk level of the battery pack according to the collision monitoring data and the air pressure monitoring data; A graded safety warning is performed on the battery pack according to the risk level.

3. The battery pack early warning method according to claim 2, characterized in that: The determining the risk level of the battery pack according to the collision monitoring data and the air pressure monitoring data includes: determining whether the air tightness of the battery pack is normal according to the air pressure monitoring data; If the airtightness of the battery pack is normal, the risk level of the battery pack is determined according to the collision monitoring data.

4. The battery pack early warning method according to claim 3, characterized in that: After determining whether the air tightness of the battery pack is normal according to the air pressure monitoring data, the method further includes: If the airtightness of the battery pack fails, the risk level of the battery pack is determined to be the first risk level.

5. The battery pack early warning method according to claim 3, characterized in that: Determining the risk level of the battery pack according to the collision monitoring data includes: Obtaining the state of the vehicle and obtaining acceleration values ​​in different directions from the collision monitoring data, wherein the different directions include X, Y, and Z directions, wherein the Y direction is the vehicle's travel direction, the Z direction is the vehicle's height direction, and the X direction is perpendicular to the Y and Z directions; When the vehicle is in a driving state, determining a collision level of the battery pack in the X direction according to the acceleration value in the X direction, and determining a collision level of the battery pack in the Z direction according to the acceleration value in the Z direction; The risk level of the battery pack is determined according to the collision level of the battery pack in the X direction and the collision level in the Z direction.

6. The battery pack early warning method according to claim 5, characterized in that: The determining the collision level of the battery pack in the X direction according to the acceleration value in the X direction includes: Determining whether the acceleration value in the X direction is less than a first preset acceleration; If the acceleration value in the X direction is greater than or equal to the first preset acceleration, determining that the collision level of the battery pack in the X direction is a first collision level; If the acceleration value in the X direction is less than the first preset acceleration, it is determined that the collision level of the battery pack in the X direction is a second collision level, and the collision degree of the first collision level is higher than that of the second collision level.

7. The battery pack early warning method according to claim 5, characterized in that: Determining the collision level of the battery pack in the Z direction according to the acceleration value in the Z direction includes: Determining whether the acceleration value in the Z direction is less than a second preset acceleration; If the acceleration value in the Z direction is greater than or equal to the second preset acceleration, determining that the collision level of the battery pack in the Z direction is a first collision level; If the acceleration value in the Z direction is less than the second preset acceleration, determining whether the acceleration value in the Z direction is less than the first preset acceleration, and the second preset acceleration is greater than the first preset acceleration; If the acceleration value in the Z direction is greater than or equal to the first preset acceleration, determining that the collision level of the battery pack in the Z direction is a second collision level; If the acceleration value in the Z direction is less than the first preset acceleration, the collision level of the battery pack in the Z direction is determined to be the third collision level, and the collision degrees of the first collision level, the second collision level and the third collision level decrease in sequence.

8. A battery pack early warning system, characterized in that: The system comprises a battery pack, an acceleration sensor, a pressure sensor and a battery pack warning device; the acceleration sensor and the pressure sensor are installed on the battery pack, and monitor the collision of the battery pack to obtain collision monitoring data and air pressure monitoring data; The battery pack early warning device is used to determine whether the battery pack has a safety risk based on the collision monitoring data and the air pressure monitoring data, and to issue a safety early warning to the battery pack when it is determined that the battery pack has a safety risk; The determining whether the battery pack presents a safety risk based on the collision monitoring data and the air pressure monitoring data includes: when the vehicle is in a driving state, determining whether the acceleration value in the non-driving direction in the collision monitoring data is greater than a third preset acceleration; if it is greater than the third preset acceleration, determining that the battery pack presents a safety risk; if it is less than or equal to the third preset acceleration, determining whether the air pressure change of the battery pack meets a preset condition based on the air pressure monitoring data; the preset condition includes that the rate of change of air pressure per unit time is greater than a preset air pressure change rate, or the rate of change of air pressure within a preset time length is greater than a preset change rate; if the air pressure change of the battery pack meets the preset condition, determining that the air tightness of the battery pack has failed, and determining that the battery pack presents a safety risk.

9. The battery pack warning system according to claim 8, characterized in that: The battery pack includes a frame and a plurality of battery cells mounted on the frame, and the acceleration sensor is mounted on the frame.

10. The battery pack warning system according to claim 9, characterized in that: The battery pack further includes a lower base plate, and the acceleration sensor is located at the center of the lower base plate.

11. A battery pack warning device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the battery pack early warning method according to any one of claims 1 to 7 are implemented.

12. A readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the battery pack early warning method according to any one of claims 1 to 7 are implemented.

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