A battery pack collision detection device and method

Abstract

An embodiment of the present invention discloses a battery pack collision detection device and method, which relates to the technical field of new energy vehicles and can more specifically determine the position where the battery pack is collided. The device includes: a plurality of collision sensors and a processor; the plurality of collision sensors are respectively connected to the processor and are used for collecting the acceleration information of the battery pack; the processor is at least used for receiving the acceleration information from multiple monitoring positions of the battery pack sent by the plurality of collision sensors, and based on the acceleration information of the multiple monitoring positions, determining the collision position of the battery pack according to the collision position detection algorithm. The present invention can be applied to vehicles using batteries as power sources.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular, to a battery pack collision detection device and method. Background Art

[0002] With the highly developed society, the technology of new energy vehicles (mainly electric vehicles) has gradually matured, and the number of new energy vehicles has also increased significantly. As the power source of new energy vehicles, the protection of the battery pack has become particularly important. During the operation of new energy vehicles, some minor accidents may occur, such as collisions or vibrations caused by bumpy roads. This makes the new energy vehicle still seem to be usable on the surface, but the battery pack may have potential failure risks due to collisions or vibrations.

[0003] Therefore, vehicles generally are equipped with a vehicle collision safety monitoring system. However, the inventor found during the implementation of the present invention that: due to the large contact area between the battery pack and the part on the vehicle for installing the battery pack, when the vehicle is vibrated or collided, the area where the battery pack may be collided is also large, and it is difficult to specifically determine the position where the battery pack is collided. Summary of the Invention

[0004] In view of this, an embodiment of the present invention provides a battery pack collision detection device, which can more specifically determine the position where the battery pack is collided.

[0005] To achieve the above invention purpose, the battery pack collision detection device provided by the embodiment of the present invention includes: a plurality of collision sensors and a processor;

[0006] The plurality of collision sensors are respectively connected to the processor and are used to collect the acceleration information of the battery pack;

[0007] The processor is at least used to receive the acceleration information from multiple monitoring positions of the battery pack sent by the plurality of collision sensors, and based on the acceleration information of multiple monitoring positions, determine the collision position of the battery pack based on a collision position detection algorithm.

[0008] Combined with the first aspect, in the first implementation manner of the first aspect, the processor includes: a first data processing module, a first calculation module, and a first determination module;

[0009] The first data processing module is used to perform filtering processing on the electrical signals of the acceleration information of the battery pack sent by each collision sensor at a predetermined time to obtain the corresponding acceleration;

[0010] The first calculation module is used to integrate each of the accelerations to obtain the speed change amount of each monitoring point within a predetermined time;

[0011] The first determination module is configured to calculate the relative coordinate of the collision point in the first direction based on the velocity change amounts of adjacent monitoring points in at least two first directions, and calculate the relative coordinate of the collision point in the second direction based on the velocity change amounts of adjacent monitoring points in at least two second directions; wherein, at least one common monitoring point exists among the adjacent monitoring points in the two first directions and the adjacent monitoring points in the two second directions.

[0012] Combined with the first aspect and the first implementation manner of the first aspect, in the second implementation manner of the first aspect, the first determination module is specifically configured to calculate the relative coordinate of the collision point in the first direction according to the formula and calculate the relative coordinate of the collision point in the second direction according to the formula wherein, a is the relative coordinate of the collision point in the first direction, and b is the relative coordinate of the collision point in the second direction; and are the velocity change amounts of three monitoring points, and χ and μ are respectively the collision point position correction coefficients, which are between 0 and 1.

[0013] Combined with the first aspect, the first and second implementation manners of the first aspect, in the third implementation manner of the first aspect, the processor further includes: a comparison module, configured to compare the magnitudes of the velocity change amounts of each monitoring point after obtaining the velocity change amounts of each monitoring point within a predetermined time.

[0014] Select at least three monitoring points from largest to smallest according to the magnitudes of the velocity change amounts for calculating the collision point position.

[0015] Combined with the first aspect, the first, second, and third implementation manners of the first aspect, in the fourth implementation manner of the first aspect, the processor further includes: a second calculation module, configured to perform curve fitting according to the accelerations of at least three of the monitoring points to obtain the first acceleration of the battery pack collision point at the first time point.

[0016] Combined with the first aspect, the first, second, third, and fourth implementation manners of the first aspect, in the fifth implementation manner of the first aspect, the second calculation module is further configured to calculate the second acceleration of the battery pack collision point at the second time point; the first time point and the second time point are two adjacent frame sampling points.

[0017] The processor further includes: a collision intensity determination module, configured to calculate the collision intensity received by the battery pack according to the accelerations of at least two adjacent frame sampling points of the battery pack collision point within a predetermined time.

[0018] Combined with the first aspect, any one of the first to fifth implementation manners of the first aspect, in the sixth implementation manner of the first aspect, the collision intensity determination module is specifically configured to calculate according to the collision intensity calculation formula Calculate the collision intensity suffered by the battery pack; where U accp (t) is the collision intensity suffered by the battery pack, and Acc p (t) is the acceleration of the collision point of the battery pack at a certain time point, where t is the time point when the vehicle collision occurs, n is the number of sampling frames, and ω1, ω2, and ω3 are respectively calibrated constants representing the tolerance of the battery pack changing with time after the collision occurs; or, the collision intensity determination module is specifically configured to calculate the local velocity change amount of the battery pack according to the local velocity change amount calculation formula:

[0019] Calculate the local velocity change amount of the battery pack; where Acc p (t) is the acceleration of the collision point of the battery pack at a certain time point, is the local velocity change amount, and t is the time point when the vehicle collision occurs;

[0020] Determine the collision intensity suffered by the battery pack according to the local velocity change amount; or,

[0021] The collision intensity determination module is specifically configured to calculate the local displacement change amount of the battery pack according to the local displacement change amount calculation formula:

[0022] Calculate the local displacement change amount of the battery pack;

[0023] Determine the collision intensity suffered by the battery pack according to the local displacement change amount;

[0024] where Acc p (t) is the acceleration of the collision point of the battery pack at a certain time point, and t is the time point when the vehicle collision occurs; or,

[0025] The collision intensity determination module is specifically configured to calculate and determine the specific power, local velocity change amount, and local displacement change amount of the battery pack according to the acceleration;

[0026] Comprehensively determine the collision intensity suffered by the battery pack according to the specific power, local velocity change amount, and local displacement change amount.

[0027] Combined with the first aspect, any one of the first to sixth embodiments of the first aspect, in the seventh embodiment of the first aspect, the collision sensor is an acceleration sensor, and a plurality of the collision sensor arrays are arranged on the surface of the battery pack.

[0028] Combined with the first aspect, any one of the first to seventh embodiments of the first aspect, in the eighth embodiment of the first aspect, the battery pack: includes a housing and a battery cell module, the battery cell module is encapsulated in the housing, and a plurality of the collision sensors are arranged in a rectangular array on the inner side and the interlayer of the housing; or,

[0029] The battery pack: includes a housing and a battery cell module, the battery cell module is encapsulated in the housing, the battery cell module includes a plurality of stacked battery cells, and a plurality of the collision sensors are arranged in a rectangular array in the interlayer between the battery cells.

[0030] The battery pack collision detection device and method provided by the embodiments of the present invention can, by setting collision sensors, monitor the acceleration information of the battery pack itself in real time, and send the acceleration information to a processor. The processor determines the collision position suffered by the battery pack based on the collision position detection algorithm according to the acceleration information. In this way, since the collision sensors collect the acceleration information of the battery pack itself, and according to the acceleration information of the battery pack, through the collision position detection algorithm, the position where the battery pack is collided can be determined more specifically. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a schematic block diagram of a structure of an embodiment of the battery pack collision detection device of the present invention;

[0033] Figure 2 It is a schematic layout diagram of a collision sensor on a battery pack provided by an embodiment of the present invention;

[0034] Figure 3 It is a schematic block diagram of a structure of another embodiment of the battery pack collision detection device of the present invention;

[0035] Figure 4 It is a schematic diagram of a working process of an embodiment of the battery pack collision detection device of the present invention;

[0036] Figure 5 It is a schematic diagram of a working process of another embodiment of the battery pack collision detection device of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following will describe the embodiments of the present invention in detail with reference to the drawings.

[0038] It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0039] The battery pack collision detection device provided by the embodiment of the present invention can be applied to the scenario of safe driving, and is particularly suitable for being installed on an electric vehicle to realize the safety monitoring of the driving power supply of the electric vehicle during vehicle driving, and improve the safety of the electric vehicle itself. Among them, collision is a factor that damages the battery pack, and when a collision occurs, the determination of the specific collision position of the battery pack is crucial for the identification of the damage degree of the battery pack.

[0040] Refer to Figure 1 and Figure 2 As shown, the battery pack collision detection device includes: a plurality of collision sensors 100 and a processor 200. In some embodiments, the collision sensors are acceleration sensors. During application, a plurality of the collision sensors are arranged in an array on the surface of the battery pack; in this way, compared with the solution where the collision sensors are arranged on the vehicle body or other positions far from the battery pack, in this embodiment, since the acceleration information of the battery pack itself is directly collected by the collision sensors, it can be more accurately determined whether the battery pack has been collided, and the collision position and collision intensity of the battery pack can be further accurately determined according to the acceleration information of the battery pack.

[0041] A plurality of the collision sensors are respectively connected to the processor and are used for collecting the acceleration information of the battery pack; specifically, a plurality of the collision sensors are electrically connected to the processor through wires.

[0042] The processor is at least used for receiving the acceleration information from multiple monitoring positions of the battery pack sent by a plurality of the collision sensors, and determining the collision position of the battery pack based on the collision position detection algorithm according to the acceleration information of the multiple monitoring positions.

[0043] It can be understood that the collision deformation of the battery pack may affect the use safety of the battery pack, and the magnitude of the collision intensity of the battery pack can reflect whether the inside of the battery is damaged or destroyed. Therefore, detecting the collision intensity and collision position of the battery pack is an important measure to prevent battery safety problems.

[0044] Currently, it is a difficult problem to determine the location where the battery pack is collided. In the embodiment of the present invention, by arranging a plurality of collision sensors for collecting the acceleration information of the battery pack, the processor can determine the collision position of the battery pack based on the collision position detection algorithm according to the acceleration information of different parts of the battery collected. In this way, since the acceleration information of the battery pack itself is collected by the collision sensors, and according to the acceleration information of the battery pack, through the collision position detection algorithm, the position where the battery pack is collided can be more specifically determined.

[0045] Based on the same technical concept as this embodiment, a battery pack collision detection method is also provided, as Figure 4As shown, the method includes the steps of: collecting acceleration information of multiple monitoring positions of the battery pack; and determining the collision position suffered by the battery pack based on the acceleration information of the multiple monitoring positions according to a collision position detection algorithm.

[0046] For the sake of convenience of description hereinafter, the battery pack collision detection device will be taken as an example for description, and the battery pack collision detection method will not be further described. Since the technical concepts are basically the same, they can be referred to and cited mutually.

[0047] The collision sensor 100 can be any one of a capacitive, inductive, strain-type, piezoresistive or piezoelectric acceleration sensor.

[0048] When the collision sensor 100 and the processor 200 are installed on a vehicle, for the convenience of communication between various complicated circuits arranged on the vehicle, the components in the whole device can realize communication between various electronic components through the Controller Area Network (CAN) bus communication protocol. The processor 200 can be a microcontroller unit (MCU), such as a single-chip microcomputer, or a microcomputer with data processing capabilities, as well as a Raspberry Pi, etc.

[0049] The collision sensor is an acceleration sensor, and a plurality of the collision sensors are arranged in an array on the surface of the battery pack.

[0050] To improve the accuracy of battery pack collision detection, the accuracy of the previous data affects the subsequent detection. Therefore, in some embodiments, the battery pack includes: a housing and a battery cell module, the battery cell module is encapsulated in the housing, and a plurality of the collision sensors are arranged in a rectangular array on the inner side and the interlayer of the housing; or,

[0051] The battery pack: includes a housing and a battery cell module, the battery cell module is encapsulated in the housing, the battery cell module includes a plurality of stacked battery cells, and a plurality of the collision sensors are arranged in a rectangular array in the interlayer between the battery cells.

[0052] In this embodiment, by arranging a plurality of collision sensors inside the battery pack housing, the collected data can directly reflect the acceleration information of the battery pack, rather than the acceleration information of other positions of the vehicle body indirectly reflecting the condition data of the battery pack, which is beneficial to improving the accuracy of battery pack collision detection.

[0053] As Figure 2 and Figure 3 shown, in an embodiment of the present invention, the processor includes: a first data processing module, a first calculation module and a first determination module;

[0054] The first data processing module is configured to perform filtering processing on the electrical signals of the acceleration information of the battery pack sent by each collision sensor at a predetermined time to obtain the corresponding acceleration.

[0055] Exemplarily, the processor (which can also be referred to as a controller) collects the acceleration signal acc n (t) at the installation points of the collision sensors (different monitoring positions of the battery pack) in real time through the collision sensors, and by filtering acc n (t), the reconstructed acceleration acc′ n (t) is obtained.

[0056] In some embodiments, the original electrical signal containing acceleration information collected is subjected to mean filtering processing according to the mean filtering formula to obtain the reconstructed acceleration acc′ n (t). Among them, the mean filtering formula is:

[0057] In the formula, n is the serial number of the collision sensor signal, representing the nth collision sensor signal, and j is the mean filtering parameter.

[0058] The first calculation module is configured to integrate each of the accelerations to obtain the velocity change amount within a predetermined time at each monitoring point.

[0059] The first calculation module is specifically configured to, according to the reconstructed acceleration signal, solve the velocity change amount at the monitoring position where each acceleration sensor is located within the integration window based on the acceleration signals obtained by each acceleration sensor. Among them, the velocity change amount The calculation formula is: In the formula, m is the start time of the integration window, and l is the time width of the integration window, that is, the above-mentioned predetermined time.

[0060] The first determination module is configured to calculate the relative coordinates of the collision point in the first direction based on the velocity change amounts of adjacent monitoring points in at least two first directions, and calculate the relative coordinates of the collision point in the second direction based on the velocity change amounts of adjacent monitoring points in at least two second directions; among them, at least one common monitoring point exists among the adjacent monitoring points in the two first directions and the adjacent monitoring points in the two second directions.

[0061] As Figure 2 shown, taking 3 adjacent monitoring points, namely 3, 5, and 6, as the monitoring points participating in the calculation as an example, the specific determination method of the collision point position is illustrated as follows:

[0062] The first determination module is specifically configured to calculate the relative coordinates of the collision point in the first direction according to the formula ; and is configured to calculate the relative coordinates of the collision point in the second direction according to the formula Calculate the relative coordinates of the collision point in the second direction; wherein a is the relative coordinate of the collision point in the first direction, and b is the relative coordinate of the collision point in the second direction; and is the velocity variation of the three monitoring points, χ and μ are the correction coefficients of the collision point position.

[0063] Among them, χ and μ are calibration coefficients used to correct the lateral position coordinates and longitudinal position coordinates of the collision point, respectively. The value of the correction coefficient is obtained through collision test and ball impact test on the battery pack, and is related to the battery pack shell structure, material, etc. The above-mentioned collision point position correction coefficient of the battery pack with corresponding shell structure and material is obtained by comparing the collision point position obtained by the test with the collision position obtained by theoretical calculation.

[0064] It is understandable that the speed change at the battery pack collision position is generally larger than that at other positions. In some embodiments, the processor further includes: a comparison module, configured to compare the magnitude of the speed change at each monitoring point after obtaining the speed change at each monitoring point within a predetermined time;

[0065] According to the magnitude of the speed variation, at least three monitoring points are selected from large to small to calculate the collision point position.

[0066] As mentioned above, the specific steps for determining the collision point position are described in detail using three monitoring points as an example. You can also select more than three points, and calculate every three monitoring points according to the above collision point position determination formula to obtain multiple collision point positions, and then you can comprehensively get the collision position area of the battery pack.

[0067] Furthermore, if Figure 5 As shown, in order to accurately determine the degree of damage at the collision position of the battery pack, in some embodiments, after the collision point position of the battery pack is obtained, the collision intensity suffered by the collision point of the battery pack is determined according to the acceleration of the collision point position of the battery pack. The specific determination method is exemplified as described below. Of course, other collision intensity determination schemes can also be used.

[0068] In some embodiments, the processor further includes: a second calculation module, configured to perform curve fitting based on the accelerations of at least three of the monitoring points to obtain a first acceleration of the battery pack collision point at a first time point.

[0069] Specifically, the collision point acceleration Acc p The fitting method is:

[0070]

[0071] Among them, ρ1, ρ2, β1, β2, λ1, λ2 are correction coefficients related to the battery pack shell structure, materials and nonlinear characteristics. The specific determination method is also obtained by calibration based on the actual battery pack collision test. In order to highlight the innovative theme of the present invention, the specific calibration method will not be repeated here, which is similar to the calibration method of χ and μ mentioned above.

[0072] Specifically, the second calculation module is further used to calculate a second acceleration of the battery pack collision point at a second time point; the first time point and the second time point are two adjacent frame sampling points;

[0073] The processor further includes: a collision strength determination module, configured to calculate the collision strength suffered by the battery pack based on the acceleration of at least two adjacent frame sampling points of the battery pack collision point within a predetermined time.

[0074] The collision strength determination module is specifically used to calculate the collision strength according to the collision strength calculation formula (i.e., the collision strength detection algorithm).

[0075]

[0076] The collision strength of the battery pack is calculated; where U accp (t) is the impact strength of the battery pack, Acc p (t) is the acceleration of the battery pack collision point at a certain time point, t is the time point when the vehicle collision occurs, n is the number of sampling frames, ω1, ω2, ω3 are calibrated constants that characterize the change of the battery pack tolerance with the time after the collision. Among them, ω1, ω2, ω3 are also obtained through the battery pack collision test, in which the shell structure and materials of the test battery pack are as similar as possible to the shell structure and materials of the battery pack installed on the vehicle to ensure the accuracy of the calibration constant, thereby improving the accuracy of the actual battery pack collision strength detection.

[0077] The collision intensity can also be calculated by the change in local velocity. The calculation formula is as follows:

[0078] Acc p (t) is the acceleration of the battery pack collision point at a certain time point, and t is the time point when the vehicle collision occurs.

[0079] The local deformation can also be calculated using the local displacement. The calculation formula is as follows:

[0080] Acc p (t) is the acceleration of the battery pack collision point at a certain time point, and t is the time point when the vehicle collision occurs.

[0081] It can also be determined by combining parameters such as specific power, local speed change amount, and local deformation.

[0082] Specifically, the collision intensity determination module is specifically configured to calculate the local speed change amount of the battery pack according to the local speed change amount calculation formula: wherein, Acc p (t) is the acceleration of the battery pack collision point at a certain time point, is the local speed change amount, and t is the time point when the vehicle collision occurs; the collision intensity received by the battery pack is determined according to the local speed change amount.

[0083] Alternatively, the collision intensity determination module is specifically configured to calculate the local displacement change amount of the battery pack according to the local displacement change amount calculation formula:

[0084] wherein, Acc p (t) is the acceleration of the battery pack collision point at a certain time point, and t is the time point when the vehicle collision occurs.

[0085] Alternatively, the collision intensity determination module is specifically configured to calculate the specific power, local speed change amount, and local displacement change amount of the battery pack according to the acceleration calculation; the collision intensity received by the battery pack is comprehensively determined according to the specific power, local speed change amount, and local displacement change amount. In this way, compared with a single index, the accuracy of judgment can be improved by comprehensively determining through multiple indexes.

[0086] It can be understood that the greater the specific power, local speed change amount, and local displacement change amount of the battery pack, the more intense the collision intensity.

[0087] In another embodiment, the processor 200 can also determine whether the battery pack is damaged and the damage level according to the determined collision position and intensity information of the battery pack, and then send a control instruction to the corresponding operating device or component for corresponding safety protection.

[0088] In the battery pack collision detection device according to the embodiment of the present invention, the processor may further include a wireless transmission module, and communicate with a terminal device, such as a mobile phone, through this module to send result information such as collision intensity and position to a management personnel or other users.

[0089] The battery pack collision detection device according to the embodiments of the present invention can better identify and determine the specific position where the battery pack is collided by creatively establishing a collision point positioning algorithm based on multiple collision sensors; in addition, a collision intensity detection algorithm based on multiple collision sensors is also established, which can more accurately determine the collision intensity of the battery pack; thereby providing support for the replacement, repair, power-off, fire extinguishing, etc. of the battery pack.

[0090] The embodiments of the present invention also provide a computer-readable storage medium storing one or more programs, which can be executed by one or more processors to implement the workflow steps executed by the collision detection device in any of the foregoing embodiments.

[0091] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, device, article or equipment including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, device, article or equipment. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, device, article or equipment including the element.

[0092] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other. The focus of each embodiment is to illustrate the differences from other embodiments.

[0093] For the convenience of description, the above device is described by dividing it into various units / modules according to functions. Of course, when implementing the present invention, the functions of each unit / module can be realized in the same or multiple software and / or hardware.

[0094] Those of ordinary skill in the art can understand that all or part of the processes in the above-described embodiment devices can be completed by instructing relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-described devices. Among them, the storage medium can also be a magnetic disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0095] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A battery pack collision detection device, characterized in that, The device includes: a plurality of collision sensors and a processor; the collision sensors are acceleration sensors, and the plurality of collision sensors are arranged in an array on the surface of the battery pack; The plurality of collision sensors are respectively connected to the processor and are used for collecting the acceleration information of the battery pack; The processor is at least used for receiving the acceleration information from multiple monitoring positions of the battery pack sent by the plurality of collision sensors, and based on the acceleration information of the multiple monitoring positions, determining the collision position of the battery pack based on a collision position detection algorithm; The processor includes: a first data processing module, a first calculation module and a first determination module; The first data processing module is used for filtering the electrical signals of the acceleration information of the battery pack at a predetermined time sent by each collision sensor to obtain the corresponding acceleration; The first calculation module is used for integrating each of the accelerations to obtain the velocity change amount of each monitoring point within a predetermined time; The first determination module is used for calculating the relative coordinates of the collision point in the first direction based on the velocity change amounts of adjacent monitoring points in at least two first directions, and calculating the relative coordinates of the collision point in the second direction based on the velocity change amounts of adjacent monitoring points in at least two second directions; wherein, there is at least one common monitoring point among the adjacent monitoring points in the two first directions and the adjacent monitoring points in the two second directions; The first determination module is specifically configured to calculate the relative coordinate of the collision point in the first direction according to the formula ; and calculate the relative coordinate of the collision point in the second direction according to the formula ; where a is the relative coordinate of the collision point in the first direction, and b is the relative coordinate of the collision point in the second direction; , and are the velocity change amounts of three monitoring points, and are the position correction coefficients of the collision point respectively, and are between 0 and 1.

2. The device according to claim 1, characterized in that, The processor further includes: a comparison module, which is used for comparing the magnitudes of the velocity change amounts of each monitoring point after obtaining the velocity change amounts of each monitoring point within a predetermined time; According to the magnitudes of the velocity change amounts, at least three monitoring points are selected from largest to smallest for calculating the collision point position.

3. The device according to claim 2, wherein The processor further includes: a second calculation module, which is used for performing curve fitting on the accelerations of at least three of the monitoring points to obtain the first acceleration of the battery pack collision point at a first time point.

4. The device according to claim 3, characterized in that, The second calculation module is further used for calculating the second acceleration of the battery pack collision point at a second time point; the first time point and the second time point are two adjacent frame sampling points; The processor further includes: a collision intensity determination module, which is used for determining the collision intensity of the battery pack according to the accelerations of at least two adjacent frame sampling points of the battery pack collision point within a predetermined time.

5. The device according to claim 4, characterized in that, The collision intensity determination module is specifically used according to the collision intensity calculation formula: Calculate the collision intensity suffered by the battery pack; among them, is the collision intensity suffered by the battery pack, is the acceleration of the battery pack collision point at a certain time point, t is the time point when the vehicle collision occurs, and n is the number of sampling frames, are respectively the calibrated constants representing the tolerance of the battery pack varying with time after the collision occurs; or, The collision intensity determination module is specifically used according to the local velocity change amount calculation formula: , the local speed change of the battery pack is calculated; where is the acceleration of the battery pack collision point at a certain time point, is the local speed change, and t is the time point when the vehicle collision occurs; Determining the collision intensity of the battery pack according to the local velocity change amount; or, The collision intensity determination module is specifically used according to the local displacement change amount calculation formula: , the local displacement change of the battery pack is calculated; Determining the collision intensity of the battery pack according to the local displacement change amount; Wherein, is the acceleration of the battery pack collision point at a certain time point, and the t is the time point when the vehicle collision occurs; or, The collision intensity determination module is specifically used for calculating and determining the specific power, local velocity change amount and local displacement change amount of the battery pack according to the acceleration; Comprehensively determining the collision intensity of the battery pack according to the specific power, local velocity change amount and local displacement change amount.

6. The device according to claim 1, characterized in that The battery pack includes a housing and a battery cell module, the battery cell module is encapsulated in the housing, and the plurality of collision sensors are arranged in a rectangular array on the inner side and in the interlayer of the housing; or, The battery pack: includes a housing and a battery cell module, the battery cell module is encapsulated in the housing, the battery cell module includes a plurality of stacked battery cells, and a plurality of the collision sensors are arranged in a rectangular array in the interlayer between the battery cells.

7. A method for detecting battery pack collision, characterized in that, Applied to the device according to any one of claims 1 to 6, it includes the steps of: Collecting acceleration information at multiple monitoring positions of the battery pack; Based on the acceleration information at the multiple monitoring positions, determining the collision position suffered by the battery pack based on a collision position detection algorithm.

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