Battery pack impact detection device and vehicle

Abstract

The present invention discloses a battery pack impact detection device and vehicle. The device comprises: N piezoelectric sensors mounted on the battery compartment where the battery pack resides, where N is an integer greater than 1; a data processing circuit connected to each of the N piezoelectric sensors for processing the piezoelectric data generated by the N piezoelectric sensors to determine the impact status of the battery pack; and a power supply circuit connected to the data processing circuit for supplying power to the data processing circuit. Based on the data detected by the piezoelectric sensors mounted on the battery compartment, the device can instantly detect the impact status of the battery pack, facilitating the subsequent provision of timely impact warning information based on the impact status, thereby reducing the risk of battery pack damage due to impact.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery pack impact detection device and a vehicle. Background Art

[0002] Amid the rapid development of new energy vehicles, battery pack safety is becoming a growing concern. Reducing the damage caused by spontaneous combustion is a pressing issue that needs to be addressed. To this end, related technologies have proposed providing early warning by detecting release signals during thermal runaway, such as specific gases or particulate matter release, or rising battery compartment temperatures. However, if a battery pack is damaged but no such release signals are detected, these technologies are unable to provide early warning. Continuing to use the damaged battery pack in this situation presents a significant safety hazard. Summary of the Invention

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, the present invention provides a battery pack impact detection device and a vehicle that can detect the impact immediately when the battery pack is impacted, thereby providing timely impact warning information based on the impact situation and reducing the risk of battery pack damage caused by the impact.

[0004] To achieve the above-mentioned objectives, an embodiment of the first aspect of the present invention proposes a battery pack impact detection device, which includes: N piezoelectric sensors installed on the battery compartment where the battery pack is located, wherein N is an integer greater than 1; a data processing circuit, respectively connected to the N piezoelectric sensors, for processing the piezoelectric data generated by the N piezoelectric sensors to obtain the impact status of the battery pack; and a power supply circuit, connected to the data processing circuit, for supplying power to the data processing circuit.

[0005] In addition, the battery pack impact detection device of the above embodiment of the present invention may also have the following additional technical features:

[0006] According to one embodiment of the present invention, the data processing circuit includes: a sampling sub-circuit, which is respectively connected to N of the piezoelectric sensors and is used to sample the piezoelectric data generated by the N piezoelectric sensors; a processor, which is connected to the sampling sub-circuit and is used to process the piezoelectric data to obtain the impact condition of the battery pack.

[0007] According to one embodiment of the present invention, the device is used in a vehicle, and the data processing circuit further includes: a CAN driver connected to the processor and used to connect to the battery management system of the vehicle, for establishing a CAN communication connection between the processor and the battery management system; wherein the processor is also used to transmit the collision situation to the battery management system.

[0008] According to one embodiment of the present invention, the power supply circuit includes: a low-voltage battery for providing a first voltage; a voltage conversion sub-circuit, respectively connected to the low-voltage battery, the sampling sub-circuit, the processor and the CAN driver, for converting the first voltage into a second voltage and a third voltage, and providing the second voltage to the sampling sub-circuit and the processor, and providing the third voltage to the CAN driver.

[0009] According to one embodiment of the present invention, the voltage conversion subcircuit includes: a first DC / DC converter, connected to the low-voltage battery, for converting the first voltage into the third voltage; a second DC / DC converter, connected to the first DC / DC converter, the first power supply terminal of the sampling subcircuit, and the processor, respectively, for converting the third voltage into the second voltage, and providing the second voltage to the first power supply terminal of the sampling subcircuit and the processor; a second DC / DC converter, connected to the first DC / DC converter and connected to the second power supply terminal of the sampling subcircuit through a first magnetic bead, for converting the third voltage into the second voltage, and providing the second voltage to the second power supply terminal of the sampling subcircuit through the first magnetic bead; and a second magnetic bead, wherein the second magnetic bead is connected between the first power supply terminal and the second power supply terminal.

[0010] According to one embodiment of the present invention, the device further includes: a connector, which is respectively connected to N of the piezoelectric sensors, the sampling sub-circuit, the CAN driver, the low-voltage battery and the voltage conversion sub-circuit, and is used to connect to the battery management system, for establishing a connection between the N piezoelectric sensors and the sampling sub-circuit, a connection between the CAN driver and the battery management system, and a connection between the low-voltage battery and the voltage conversion sub-circuit.

[0011] According to one embodiment of the present invention, the connector is further connected to the processor to transmit a hard-line wake-up signal to the processor to wake up the processor.

[0012] According to one embodiment of the present invention, N piezoelectric sensors are mounted on the chassis of the bin holding unit and form n piezoelectric sensor networks, where n is less than N and is a positive integer. The processor is specifically configured to obtain n pieces of impact information based on n sets of piezoelectric data corresponding to the n piezoelectric sensor networks, and to obtain the impact condition based on the n pieces of impact information.

[0013] According to one embodiment of the present invention, the value of N is 8, and the sampling sub-circuit includes: two analog-to-digital converters, respectively denoted as a first analog-to-digital converter and a second analog-to-digital converter; the first analog-to-digital converter is respectively connected to the processor and the four piezoelectric sensors, and is used to collect piezoelectric data corresponding to the four piezoelectric sensors; the second analog-to-digital converter is respectively connected to the processor and the other four piezoelectric sensors, and is used to collect piezoelectric data corresponding to the four piezoelectric sensors.

[0014] According to one embodiment of the present invention, the analog-to-digital converter acquires piezoelectric data in an interrupt manner, and the interrupt frequency is determined according to the data output rate of the analog-to-digital converter. The processor is provided with 8 data buffer areas, which correspond to the 8 piezoelectric sensors respectively, and the value of n is 2; wherein, the processor is specifically used to cache the piezoelectric data to the corresponding data buffer area when the piezoelectric data volume reaches a preset threshold, and when the piezoelectric data is cached in all 8 data buffer areas and the cache duration is within a preset time range, 2 impact information are obtained according to the 2 sets of piezoelectric data, and the impact situation is obtained according to the 2 impact information.

[0015] According to one embodiment of the present invention, the impact information includes the impact position and the impact energy, or includes the impact position and the damage level; wherein the processor is specifically used to take the impact information corresponding to the impact energy being greater than the energy threshold or the damage level being greater than the preset level as the impact situation.

[0016] According to one embodiment of the present invention, the piezoelectric sensor includes: a shell, the shell is provided with a cavity, and the shell is provided with M mounting holes, wherein the piezoelectric sensor is installed on the battery compartment through the M mounting holes, and M is a positive integer; a piezoelectric probe, and the piezoelectric probe is arranged in the cavity.

[0017] To achieve the above-mentioned objectives, a second embodiment of the present invention provides a vehicle, which includes: a battery pack, a battery compartment for placing the battery pack, and the above-mentioned battery pack impact detection device.

[0018] The battery pack impact detection device and vehicle of the embodiment of the present invention can realize real-time detection of the battery pack impact situation based on the data detected by the piezoelectric sensor installed on the battery compartment, so as to facilitate the subsequent timely provision of impact warning information based on the impact situation, thereby reducing the risk of battery pack damage caused by impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a structural block diagram of a battery pack impact detection device according to an embodiment of the present invention;

[0020] Figure 21 is a schematic diagram of the installation position of a piezoelectric sensor according to an embodiment of the present invention;

[0021] Figure 3 is a topological diagram of a collision detection device according to an embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of a housing of a piezoelectric sensor according to an embodiment of the present invention;

[0023] Figure 5 is a software structure diagram of a collision detection device according to an embodiment of the present invention;

[0024] Figure 6 is a flow chart of piezoelectric data processing according to one embodiment of the present invention;

[0025] Figure 7 This is a flowchart of the algorithm of the core computing module of one embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the locations of characteristic location marking points according to an embodiment of the present invention;

[0027] Figure 9 1 is a structural block diagram of a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0029] The following describes a battery pack collision detection device and a vehicle according to embodiments of the present invention with reference to the accompanying drawings.

[0030] Figure 1 1 is a structural diagram of a battery pack impact detection device according to an embodiment of the present invention.

[0031] like Figure 1 As shown, the impact detection device 100 includes: N piezoelectric sensors 101 , a data processing circuit 102 and a power supply circuit 103 .

[0032] Among them, N piezoelectric sensors 101 are installed in the battery compartment 1 where the battery pack is located (such as Figure 2As shown) (such as installed on the chassis of the battery compartment 1), where N is an integer greater than 1; the data processing circuit 102 is respectively connected to the N piezoelectric sensors 101, and is used to process the piezoelectric data generated by the N piezoelectric sensors 101 to obtain the impact condition of the battery pack; the power supply circuit 103 is connected to the data processing circuit 102, and is used to supply power to the data processing circuit 102.

[0033] Specifically, after a battery pack impact event occurs, the mechanical waves generated by the impact process will spread rapidly around the internal structure of the battery pack with the impact point as the center. The propagation path information carried by the mechanical waves will be captured by the N piezoelectric sensors 101 located on the battery compartment 1 where the battery pack is located. The N piezoelectric sensors 101 can realize energy conversion, converting the kinetic energy generated by the impact into a current signal (i.e., piezoelectric data), and transmit it to the data processing circuit 102. The data processing circuit 102 can analyze the current signals of the N piezoelectric sensors 101 to obtain the impact situation of the battery pack. Among them, the value of N can be 4, 6, 8, 10, 12, etc. Figure 2 Taking N=8 as an example, the impact situation may include the impact position, impact energy, and the damage level of the battery pack caused by the impact, etc. Based on the impact situation, a risk warning may be issued.

[0034] The impact detection device for the battery pack of the embodiment of the present invention can realize instant detection of the impact situation of the battery pack based on the data detected by the piezoelectric sensor installed on the battery compartment when the battery pack collides, so as to facilitate the subsequent timely provision of impact warning information according to the impact situation, thereby reducing the risk of damage to the battery pack due to impact. The energy detection of the impact signal and the impact position detection are performed to provide impact warning information and reduce the risk of battery damage due to impact.

[0035] In some embodiments, as Figure 3 As shown, the data processing circuit 102 includes a sampling subcircuit 21 and a processor 22. The sampling subcircuit 21 is connected to each of the N piezoelectric sensors 101 to sample the piezoelectric data generated by the N piezoelectric sensors 101. The processor 22 is connected to the sampling subcircuit 21 to process the piezoelectric data to determine the impact status of the battery pack.

[0036] Among them, Figure 3 As shown, the processor 22 may be an MCU (Microcontroller Unit), and the MCU may adopt an S32K146U chip.

[0037] In some embodiments, the sampling sub-circuit 21 may include: a plurality of analog-to-digital converters. Figure 2Taking the example shown in FIG2 as an example, the sampling subcircuit 21 includes two analog-to-digital converters, which are respectively recorded as the first analog-to-digital converter and the second analog-to-digital converter; the first analog-to-digital converter is respectively connected to the processor 22 and the four piezoelectric sensors 101, and is used to collect piezoelectric data corresponding to the four piezoelectric sensors 101; the second analog-to-digital converter is respectively connected to the processor and the other four piezoelectric sensors 101, and is used to collect piezoelectric data corresponding to the four piezoelectric sensors 101.

[0038] Specifically, see Figure 3 The two analog-to-digital converters can utilize two high-precision, 4-channel differential ADCs (Analog to Digital Converters). These ADCs can utilize the ADS131 chip to synchronously acquire eight piezoelectric signals. A magnetic bead array is used at the ADC acquisition front end to convert the piezoelectric sensor's current signal into a voltage signal. This voltage signal is then adjusted to within the ADC chip's acquisition range, enabling the acquisition of piezoelectric data while minimizing ADC sampling losses. The ADCs can communicate with the MCU using an SPI interface (Serial Peripheral Interface).

[0039] In some embodiments, the collision detection device 100 is used in a vehicle, such as Figure 3 As shown, the data processing circuit 102 also includes: a CAN driver 23, which is connected to the processor 22 and is used to connect to the vehicle's battery management system BMS, and is used to establish a CAN (Controller Area Network) communication connection between the processor 22 and the battery management system BMS; wherein the processor 22 can also be used to transmit the collision situation to the battery management system BMS so that the BMS can issue an early warning, such as issuing an early warning signal through the vehicle's on-board terminal or dashboard.

[0040] Specifically, if Figure 3 As shown, the CAN driver 23 can be a CAN transceiver, and can use a TCAN1051 chip to enable the MCU to access the vehicle's CAN bus and further achieve CAN communication with the BMS.

[0041] In some embodiments, as Figure 2 、 3 As shown, the power supply circuit 103 includes: a low-voltage battery ( Figure 2 、 3), a voltage conversion subcircuit 24. The low-voltage battery is used to provide a first voltage (e.g., 12V). The voltage conversion subcircuit 24 is connected to the low-voltage battery, the sampling subcircuit 21, the processor 22, and the CAN driver 23, respectively, and is used to convert the first voltage into a second voltage (e.g., 3.3V) and a third voltage (e.g., 5V). The second voltage is provided to the sampling subcircuit 21 and the processor 22, and the third voltage is provided to the CAN driver 23.

[0042] Specifically, the low-voltage battery can be a 12V vehicle-mounted lead-acid battery, with a built-in power management module (i.e., the aforementioned voltage conversion subcircuit 24) that separates the 12V vehicle-mounted lead-acid battery into two power branches: 5V and 3.3V. The CAN driver 23 is powered by 5V, while other modules (including the processor 22 and sampling subcircuit 21) are powered by 3.3V.

[0043] In some embodiments, as Figure 3 As shown, the voltage conversion subcircuit 24 includes: a first DC / DC converter 30, a second DC / DC converter 31, a first magnetic bead BEAD1, and a second magnetic bead BEAD2. The first DC / DC converter 30 is connected to the low-voltage battery and is used to convert the first voltage into a third voltage. The second DC / DC converter 31 is connected to the first DC / DC converter 30, the first power supply terminal (such as the digital power supply terminal) of the sampling subcircuit 21, and the processor 22, respectively, and is used to convert the third voltage into a second voltage and provide the second voltage to the first power supply terminal of the sampling subcircuit 21 and the processor 22. The second DC / DC converter 31 is connected to the first DC / DC converter 30 and is connected to the second power supply terminal (such as the analog power supply terminal) of the sampling subcircuit 21 through the first magnetic bead 32. It is used to convert the third voltage into a second voltage and provide the second voltage to the second power supply terminal of the sampling subcircuit 21 through the first magnetic bead BEAD1. The second magnetic bead BEAD2 is connected between the first power supply terminal and the second power supply terminal.

[0044] The first voltage may be 12V, the second voltage may be 5V, and the third voltage may be 3.3V.

[0045] In some embodiments, as Figure 3 As shown, the impact detection device 100 also includes: a connector 25, which is respectively connected to the N piezoelectric sensors 101, the sampling sub-circuit 21, the CAN driver 23, the low-voltage battery and the voltage conversion sub-circuit 24, and is used to connect to the battery management system BMS, for establishing a connection between the N piezoelectric sensors 101 and the sampling sub-circuit 21, a connection between the CAN driver 23 and the battery management system BMS, and a connection between the low-voltage battery and the voltage conversion sub-circuit 24.

[0046] In some embodiments, the connector 25 is further connected to the processor 22 to transmit a hard-wired wake-up signal to the processor 22 to wake up the processor 22. The hard-wired wake-up signal can support both 12V and 5V voltage levels.

[0047] Specifically, connector 25 can use a 24-pin plug as an interface, including: a 16-pin piezoelectric sensor differential input interface, a 2-pin CAN interface (CANH, CANL interface), a 2-pin power interface (12V positive and negative interfaces), and a 1-pin wakeup interface. The remaining 3 pins can be vacant. Connector 25 can use a commonly available 24-pin interface, such as IMSA 13065s-2 / IMSA13065b-2. It should be noted that in the design of the connector 25 interface, it is necessary to consider the mutual interference between the CAN interface and the differential sampling interface. Minimal or even no interference is preferred.

[0048] In some embodiments, as Figure 4 As shown, the piezoelectric sensor 101 includes a housing 40 and a piezoelectric probe (not shown). The housing 40 has a cavity, and the housing 40 has M mounting holes 41. The piezoelectric probe is located in the cavity and generates piezoelectric data, which is transmitted to the data processing circuit 102. The piezoelectric sensor 101 is mounted on the battery compartment 1 through the M mounting holes 41, where M is a positive integer.

[0049] Specifically, see Figure 4 The outer dimensions of housing 40 can be 63*66.2*23mm, M can be set to 2, and two mounting holes 41 can be provided on either side of housing 40, with a spacing of 51±0.3mm and a diameter of 5.5±0.15mm. Housing 40 can be made of a material with a flame retardant grade of V-0. The use of secondary materials is prohibited. The color can be RAL7021 in accordance with the international RAL color standard.

[0050] In some embodiments, N piezoelectric sensors 101 are installed on the chassis of the battery compartment 1 and form n groups of piezoelectric sensing networks, where n is less than N and n is a positive integer; wherein the processor 22 is specifically used to obtain n impact information based on n groups of piezoelectric data corresponding to the n groups of piezoelectric sensing networks, and obtain the impact situation based on the n impact information.

[0051] Specifically, taking 8 piezoelectric sensors 101 as an example, the 8 piezoelectric sensors 101 can be divided into two groups, see Figure 2The left side is divided into groups of four, and the right side is divided into groups of four. Each group of piezoelectric data can be used to obtain impact information. The area enclosed by each group of piezoelectric sensor networks serves as a detection zone. Based on the corresponding piezoelectric data from that group of piezoelectric sensor networks, impact information about that detection zone, such as impact location and impact energy, can be analyzed. Therefore, by grouping and narrowing the detection zone, the accuracy of impact detection can be improved.

[0052] In some embodiments, as Figure 5 As shown, the analog-to-digital converter can collect piezoelectric data in an interrupt manner, and the interrupt frequency is determined according to the data output rate of the analog-to-digital converter 21. For 8 piezoelectric sensors 101, as shown Figure 6 As shown, the processor 22 may be provided with 8 data cache areas, corresponding to 8 piezoelectric sensors 101 respectively, and the value of n is 2; wherein, the processor 22 is specifically used to cache the piezoelectric data to the corresponding data cache area when the piezoelectric data volume reaches a preset threshold value, and when the piezoelectric data is cached in all 8 data cache areas and the cache duration is within a preset time range, 2 impact information are obtained according to the 2 sets of piezoelectric data, and the impact situation is obtained according to the 2 impact information.

[0053] The preset time range can be determined based on the location of each piezoelectric sensor 101. Since each piezoelectric sensor 101 is located at a different location and the impact may occur at a different location, the transmission speed of each piezoelectric sensor 101, that is, the time when the piezoelectric data is collected, is different. Therefore, it is necessary to obtain piezoelectric data from all piezoelectric sensors 101, and the piezoelectric data is for the same impact or multiple impacts with very short intervals.

[0054] Specifically, if Figure 6As shown, the data processing circuit 102 primarily operates through a data-driven software module. That is, each time new external data is generated, the entire algorithm is driven, and data collection and production are automatically performed by the ADC. Therefore, the entire software module can be divided into three major parts: an ADC acquisition and cache module, a core computing module, and an external interface module. Furthermore, the software module may include additional modules, including a test data injection module and a CAN bootloader module (which can be integrated into the external interface module). The ADC acquisition and cache module is responsible for collecting piezoelectric data and caching it as required. When the data meets the calculation conditions, it issues a signal to initiate a calculation. Upon receiving the calculation signal from the ADC acquisition and cache module, the core computing module extracts the piezoelectric data from the data cache channel by channel for calculation. Because the algorithm in the core computing module is sequential and the channels are relatively uncorrelated, an optimized design of the internal calculation cache is possible. The core computing module analyzes the piezoelectric data to determine the impact condition and, based on the impact condition, determines whether to output an alarm signal. The external interface module (result IO module) is responsible for receiving alarm signals and reporting them as required, while processing commands issued by the BMS; in addition, the result IO module can also send alarm information to the storage data module (which can be set as needed) for storage.

[0055] In the above process, if Figure 7 As shown, the ADC acquisition cache module can achieve synchronous data acquisition from 8 channels. The MCU and ADC module are connected via SPI. Whenever the MCU completes data acquisition for a preset threshold, such as 128ms, an event is generated and sent to the message processing thread. The message processing thread pushes the received 128ms of data to the corresponding data buffer. If the received data meets the requirements, an event is generated for the core computing module, which then begins computing the 1024ms of data in the buffer (i.e., the data for packets 1-8). Furthermore, when 128ms of data is received via SPI, an event is sent, and the idle packet 9 is used as the data receiving address for the ADC acquisition cache module. Packet 9 is also linked to the end of packet 0, generating a data completion event. After the computation is complete, packet 8 is disconnected from packet 7 and designated as an idle packet. Packet 7 serves as the packet header, and a new round of computation begins. To determine whether the data volume has reached the preset threshold, a data information location corresponding to the preset threshold can be set for each packet. Before starting the computation, a determination can be made as to whether the data volume has exceeded this location to determine whether the data volume has reached the preset threshold.

[0056] In some embodiments, the impact information includes the impact position and impact energy, or the impact position and damage level; wherein the processor 22 is specifically used to take the impact information corresponding to the impact energy being greater than the energy threshold or the damage level being greater than the preset level as the impact situation.

[0057] Specifically, the core computing module uses algorithmic processing to achieve the purpose of identifying the impact energy (or damage level) and impact location. Taking the impact location and impact energy as an example, the processing process may include: performing noise reduction processing on the ADC sampled and stored data and identifying the effective signal location of the ADC sampled data; when the sampled data meets the predetermined algorithm requirements, the sampled data is subjected to FFT (Fast Fourier Transform), envelope processing, trapZ (trapezoidal integral area) calculation, Tukeywin (Hanning window) filtering, IFFT (Inverse Fast Fourier Transform), noise reduction and other processing. After the processing is completed, it is necessary to perform certain calculations on the signal envelope peak, the time when the effective signal arrives, and the waveform length of the effective signal, and the impact energy and impact location are obtained based on the calculation results.

[0058] Below is Figure 2 Taking the placement of the four piezoelectric sensors 101 on the left (near the boundary of the battery compartment 1) as an example, the analysis process of the impact position and impact energy of the battery pack is described. The specific process includes:

[0059] S1, selection of feature position identification points, such as Figure 8 As shown. The selection principle is to ensure that key locations of the battery pack are marked with points, including inside each battery cell and on the structural beams. Energy points and positioning points are set within the characteristic position points to obtain the energy calibration coefficient and positioning coefficient, respectively. The characteristic position point at the center of each battery cell can be set as both an energy point and a positioning point, and the characteristic position point outside the center beam can be set as a positioning point.

[0060] S2, based on the distribution characteristics of the characteristic position identification points on the battery pack, the impact position is divided into five situations: corner position point, center line position point, diagonal position point, internal position point and center position point. Figure 8 , each location point is set as follows:

[0061] Corner position points: #13, #19, #25 and #31;

[0062] Centerline position points: #2, #3, #4, #5, #6, #7, #8 and #9;

[0063] Diagonal positions: #12, #18, #24 and #30;

[0064] Internal position points: (#10, #11, #38, #14, #15, #34) are divided into a group, (#16, #17, #35, #20, #21, #40) are divided into a group, (#22, #23, #39, #26, #27, #36) are divided into a group, and (#28, #29, #37, #32, #33, #41) are divided into a group;

[0065] Center location point: #1.

[0066] S3, pre-implement a falling ball impact calibration test on the battery pack to obtain the energy calibration coefficient and positioning coefficient. In the calibration experiment, a simulated impactor (a small ball) is dropped from a certain height to perform free fall motion, and hits the energy identification point and the positioning identification point in turn. Through the wave energy conservation condition on the wavefront and the position distribution characteristics of the positioning identification point in the battery pack structure, the energy calibration coefficient, corner point positioning coefficient, centerline point positioning coefficient, diagonal point positioning coefficient and internal point positioning coefficient are calculated.

[0067] S4, using the energy calibration coefficient and positioning coefficient obtained in S3, performs real-time monitoring of random battery pack impact events, first determines the location of the impact point and then evaluates the impact energy, as follows:

[0068] S41: Determine corner locations. Corner locations are closer to the piezoelectric sensor, resulting in larger sensor signal amplitudes and more prominent characteristics, making them easier to identify. Therefore, the corner location coefficient can be used to prioritize the location. If the location is determined to be a corner, the process proceeds to S45; otherwise, the process proceeds to S42.

[0069] S42: Determination of centerline, diagonal, and interior position points. These three situations require determination using the centerline point positioning coefficient, diagonal point positioning coefficient, and interior point positioning coefficient. If the determination condition meets any of the three conditions, the corresponding determination reliability is calculated and the process proceeds to S43; otherwise, the process proceeds to S44.

[0070] S43, comparing the credibility of the impact position determined as a center line point, a diagonal point and an internal point, determining the one with the highest credibility as the final result, and entering S45.

[0071] S44, determination of the center position point: If the determination conditions in S41 and S42 are not met, the point is determined to be the center position point and the process proceeds to S45.

[0072] S45, the impact position has been determined, and the impact energy can be evaluated by combining the wavefront wave energy calculation formula with the determined impact point position coordinates.

[0073] In S5, the BMS outputs the impact energy and impact position of the battery pack and re-enters S4.

[0074] To sum up, the impact detection device of the battery pack in the embodiment of the present invention can output piezoelectric data through the piezoelectric sensor when the battery pack is impacted, and obtain the impact condition of the battery pack by real-time analysis based on the piezoelectric data through the data processing circuit, and can provide impact warning information in time according to the impact condition, thereby reducing the risk of damage to the battery pack due to impact.

[0075] Figure 9 FIG. 1 is a structural diagram of a vehicle according to an embodiment of the present invention.

[0076] like Figure 9 As shown, the vehicle 900 includes a battery pack 901 , a battery compartment 1 in which the battery pack 901 is installed, and the aforementioned collision detection device 100 .

[0077] The vehicle of the embodiment of the present invention, through the above-mentioned impact detection device 100, can output piezoelectric data through the piezoelectric sensor when the battery pack is impacted, and use the data processing circuit to instantly analyze the piezoelectric data to obtain the impact condition of the battery pack, and can provide impact warning information in time according to the impact condition, thereby reducing the risk of damage to the battery pack due to impact.

[0078] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0079] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0081] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0082] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0083] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A battery pack impact detection device, characterized in that: The device comprises: N piezoelectric sensors are mounted on a battery compartment where the battery pack is located, where N is an integer greater than 1; the N piezoelectric sensors form n groups of piezoelectric sensor networks, where n is less than N and is a positive integer; and the area enclosed by each group of piezoelectric sensor networks serves as a detection area; a data processing circuit, connected to each of the N piezoelectric sensors, for processing piezoelectric data generated by the N piezoelectric sensors, obtaining n pieces of impact information based on the n sets of piezoelectric data corresponding to the n sets of piezoelectric sensing networks, one piece of impact information corresponding to each detection area, and obtaining an impact condition of the battery pack based on the n pieces of impact information; A power supply circuit is connected to the data processing circuit and is used to supply power to the data processing circuit.

2. The device according to claim 1, characterized in that The data processing circuit includes: a sampling subcircuit, connected to each of the N piezoelectric sensors, for sampling piezoelectric data generated by the N piezoelectric sensors; A processor is connected to the sampling sub-circuit and is used to process the piezoelectric data to obtain the impact condition of the battery pack.

3. The device according to claim 2, characterized in that The device is used in a vehicle, and the data processing circuit further comprises: A CAN driver, connected to the processor and used to connect to the battery management system of the vehicle, for establishing a CAN communication connection between the processor and the battery management system; The processor is further configured to transmit the collision condition to the battery management system.

4. The device according to claim 3, characterized in that The power supply circuit comprises: a low-voltage battery, configured to provide a first voltage; a voltage conversion subcircuit, connected to the low-voltage battery, the sampling subcircuit, the processor, and the CAN driver, respectively, for converting the first voltage into a second voltage and a third voltage, providing the second voltage to the sampling subcircuit and the processor, and providing the third voltage to the CAN driver.

5. The device according to claim 4, characterized in that The voltage conversion sub-circuit comprises: a first DC / DC converter, connected to the low-voltage battery, and configured to convert the first voltage into the third voltage; a second DC / DC converter, connected to the first DC / DC converter, the first power supply terminal of the sampling subcircuit, and the processor, respectively, for converting the third voltage into the second voltage, and providing the second voltage to the first power supply terminal of the sampling subcircuit and the processor; a second DC / DC converter, connected to the first DC / DC converter and connected to the second power supply terminal of the sampling sub-circuit through a first magnetic bead, configured to convert the third voltage into the second voltage and provide the second voltage to the second power supply terminal of the sampling sub-circuit through the first magnetic bead; A second magnetic bead is connected between the first power supply end and the second power supply end.

6. The device according to claim 4, characterized in that The device further comprises: A connector is respectively connected to the N piezoelectric sensors, the sampling subcircuit, the CAN driver, the low-voltage battery and the voltage conversion subcircuit, and is used to connect to the battery management system, for establishing a connection between the N piezoelectric sensors and the sampling subcircuit, a connection between the CAN driver and the battery management system, and a connection between the low-voltage battery and the voltage conversion subcircuit.

7. The device according to claim 6, characterized in that The connector is further connected to the processor and is used to transmit a hard-line wake-up signal to the processor to wake up the processor.

8. The device according to claim 2, characterized in that N piezoelectric sensors are mounted on the chassis of the battery compartment; The processor is specifically configured to obtain n pieces of impact information based on n groups of piezoelectric data corresponding to the n groups of piezoelectric sensing networks, and to obtain the impact condition based on the n pieces of impact information.

9. The device according to claim 8, characterized in that The value of N is 8, and the sampling subcircuit includes: two analog-to-digital converters, respectively denoted as a first analog-to-digital converter and a second analog-to-digital converter; The first analog-to-digital converter is connected to the processor and the four piezoelectric sensors respectively, and is used to collect piezoelectric data corresponding to the four piezoelectric sensors; The second analog-to-digital converter is connected to the processor and the other four piezoelectric sensors respectively, and is used to collect piezoelectric data corresponding to the four piezoelectric sensors.

10. The device according to claim 9, characterized in that The analog-to-digital converter uses an interrupt method to collect piezoelectric data. The interrupt frequency is determined according to the data output rate of the analog-to-digital converter. The processor is provided with 8 data buffer areas, corresponding to 8 piezoelectric sensors respectively. The value of n is 2. The processor is specifically used to cache the piezoelectric data to the corresponding data cache area when the piezoelectric data volume reaches a preset threshold, and when the piezoelectric data is cached in all 8 data cache areas and the cache duration is within a preset time range, obtain 2 impact information based on the 2 sets of piezoelectric data, and obtain the impact situation based on the 2 impact information.

11. The device according to claim 10, characterized in that The impact information includes the impact position and impact energy, or includes the impact position and damage level; The processor is specifically configured to use collision information corresponding to a collision energy being greater than an energy threshold or a damage level being greater than a preset level as the collision condition.

12. The device according to claim 1, characterized in that The piezoelectric sensor comprises: A housing having a cavity and M mounting through holes, wherein the piezoelectric sensor is mounted on the battery compartment through the M mounting through holes, where M is a positive integer; A piezoelectric probe is arranged in the cavity.

13. A vehicle, characterized in that: include: A battery pack, a battery compartment for placing the battery pack, and a device as claimed in any one of claims 1 to 12.

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