Method for testing impact resistance of power battery and related equipment

Abstract

The invention discloses a method for testing the impact resistance of a power battery and related equipment, and relates to the technical field of safety performance evaluation of the power battery, and the method comprises the steps: configuring the height parameters of a ball head and a falling ball in a falling ball impact test device based on the size of the power battery and a preset test standard; after a measurement module in the falling ball impact test device is calibrated, the ball head is released based on the falling ball height parameter; the data acquisition module is used for acquiring data to obtain a first time curve and a second time curve, the first time curve is used for representing a time-varying curve of dynamic impact force generated when the ball head impacts the power battery, and the second time curve is used for representing a time-varying curve of dynamic impact force generated when the ball head impacts the power battery. The second time curve is used for representing a curve that the deformation quantity of the surface of the power battery changes along with time under the impact action of the ball head; and obtaining a test result of the impact resistance of the power battery based on the first time curve and the second time curve.

Description

Technical Field

[0001] The present application relates to the technical field of power battery safety performance evaluation, and in particular to a method for testing the impact resistance of a power battery and related equipment. Background Art

[0002] In the field of power battery safety performance assessment, impact resistance testing is the core link to verify the mechanical stability of the battery. Especially in the context of the rapid development of new energy vehicles and energy storage systems, higher requirements are placed on the accuracy, efficiency and adaptability of the test methods. However, the drop hammer impact test devices and methods widely used in the existing technology have significant limitations: traditional solutions mostly adopt impact modes with fixed parameters, which makes it difficult to dynamically adjust key parameters such as ball head size and drop height according to battery size differences or test standards, resulting in insufficient adaptability of the test scenario and inability to cover the customized requirements of diverse battery types such as metal shells, soft-pack batteries, and solid-state batteries. In addition, the existing technology relies on a single sensor (such as only measuring static displacement or impact force peak), and the data acquisition dimension is severely limited. It is impossible to synchronously capture key indicators such as the maximum penetration depth and energy absorption rate during dynamic impact. It also lacks real-time data fusion capabilities and needs to rely on manual intervention for offline analysis, which is not only inefficient but also prone to human errors. Especially in high-precision test scenarios, traditional methods have difficulty eliminating timing errors and noise interference due to the lack of integrated multi-sensor redundancy verification and automated triggering mechanisms, resulting in insufficient reliability of test results.

[0003] Therefore, how to achieve efficient, accurate and automated testing of the impact resistance of power batteries has become a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention of this application is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] This application specifically includes the following aspects:

[0006] In a first aspect, the present application proposes a method for testing the impact resistance of a power battery, which is applied to a falling ball impact test device. The method comprises:

[0007] Configure the ball head and drop height parameters in the drop ball impact test device based on the size of the power battery and the preset test standards;

[0008] After calibrating the measurement module in the falling ball impact test device, releasing the ball head based on the falling ball height parameter;

[0009] performing data acquisition on the measurement module to obtain a first time curve and a second time curve, wherein the first time curve is used to represent a curve of a dynamic impact force generated when the ball head impacts the power battery over time, and the second time curve is used to represent a curve of a deformation amount of the surface of the power battery under the impact of the ball head over time;

[0010] A test result of the impact resistance performance of the power battery is obtained based on the first time curve and the second time curve.

[0011] In a feasible embodiment, the measurement module includes a high-speed camera unit, a piezoelectric force sensor, and a laser displacement sensor group. The calibrating the measurement module in the falling ball impact test device includes:

[0012] Performing lens distortion calibration and spatial resolution calibration on the high-speed camera unit using a checkerboard calibration plate;

[0013] Performing linearity calibration on the piezoelectric force sensor using a preset standard weight;

[0014] A position alignment calibration is performed on the laser displacement sensor group based on a result of the linearity calibration.

[0015] In a feasible implementation manner, the falling ball impact test device includes an electromagnetic release module, and the data collection of the measurement module includes:

[0016] Acquire a pulse signal from the electromagnetic release module;

[0017] The pulse signal is used to trigger data collection on the measurement module.

[0018] In a feasible implementation manner, obtaining a test result of the impact resistance performance of the power battery based on the first time curve and the second time curve includes:

[0019] Performing sliding window peak detection on the first time curve, and extracting the first maximum point as the dynamic maximum intrusion depth;

[0020] Obtaining a static penetration depth based on displacement data of the ball head during a preset time period after impact;

[0021] Combining the first time curve and the second time curve by an integral operation to obtain an energy absorption rate;

[0022] Based on the dynamic maximum intrusion depth, the static intrusion depth and the energy absorption rate, a test result of the impact resistance performance of the power battery is obtained.

[0023] In a feasible implementation manner, obtaining the test result of the power battery impact performance based on the dynamic maximum invasion depth, the static invasion depth, and the energy absorption rate includes:

[0024] Comparing a preset dynamic safety threshold and a preset static intrusion safety threshold with the dynamic maximum intrusion depth and the static intrusion depth, respectively, to obtain a first comparison result, and determining whether the deformation of the power battery exceeds a safety range based on the first comparison result;

[0025] Comparing a preset energy absorption rate threshold with the energy absorption rate to obtain a second comparison result, and determining whether the energy dissipation capacity of the power battery meets the impact resistance requirement based on the second comparison result;

[0026] If the deformation of the power battery exceeds the safety range, or the energy dissipation capacity of the power battery does not meet the impact resistance requirement, the impact performance test result of the power battery is determined to be unqualified;

[0027] If the deformation of the power battery does not exceed the safety range and the energy dissipation capacity of the power battery meets the impact resistance requirement, the test result of the impact performance of the power battery is determined to be qualified.

[0028] In a feasible implementation manner, the falling ball height parameter includes the falling ball height range of the ball head and the friction coefficient of the vertical guide tube in the falling ball impact test device.

[0029] In a second aspect, the present application proposes a device for testing the impact resistance of a power battery, which is applied to the method for testing the impact resistance of a power battery described in any one of the above embodiments. The device comprises:

[0030] A parameter configuration module is used to configure the ball head and drop ball height parameters in the drop ball impact test device based on the size of the power battery and the preset test standard;

[0031] a measurement calibration module, configured to release the ball head based on the falling ball height parameter after calibrating the measurement module in the falling ball impact test device;

[0032] a data acquisition module, configured to acquire data from the measurement module to obtain a first time curve and a second time curve, wherein the first time curve is a curve representing a change in the dynamic impact force generated when the ball head impacts the power battery over time, and the second time curve is a curve representing a change in the deformation of the surface of the power battery under the impact of the ball head over time;

[0033] A result testing module is used to obtain a test result of the impact resistance performance of the power battery based on the first time curve and the second time curve.

[0034] In a third aspect, an electronic device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is configured to implement the steps of any method for testing the impact resistance of a power battery according to the first aspect when executing the computer program stored in the memory.

[0035] In a fourth aspect, the present application further proposes a falling ball impact test device, comprising a ball head, a measuring module and the electronic device of the third aspect mentioned above.

[0036] In a fifth aspect, the present application further proposes a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for testing the impact resistance of a power battery according to any one of the first aspects.

[0037] In summary, the test method for the impact resistance of power batteries proposed in this application is applied to a falling ball impact test device. The falling ball impact test device adopts a composite measurement strategy, which complements the laser displacement sensor (high sampling rate) with high-speed vision (full-field strain) to solve the limitations of a single sensor in dynamic impact. At the same time, multi-sensor redundancy and algorithm cross-validation are adopted to synchronously output displacement, force, energy, and deformation field thinking data to support battery failure mode analysis. In addition, the falling ball impact test device provided by this application has a simple structure and strong engineering applicability. It is compatible with various types such as metal casings, soft packs, and solid-state batteries. It can be adjusted to adapt to power batteries of various sizes, and there is no need to customize corresponding tooling according to the size of the power battery.

[0038] The testing method for the impact resistance of power batteries proposed in this application, as well as other advantages, objectives and features of this application will be partially reflected in the following description, and will also be partially understood by technicians in this field through research and practice of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present description. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0040] Figure 1 A schematic diagram of a process for testing the impact resistance of a power battery provided in an embodiment of the present application;

[0041] Figure 2A schematic structural diagram of a falling ball impact test device provided in an embodiment of the present application;

[0042] Figure 3 A schematic diagram of the functional modules of a device for testing the impact resistance of a power battery provided in an embodiment of the present application;

[0043] Figure 4 A schematic diagram of the structure of an electronic device for testing the impact resistance of a power battery provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0045] In this article, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also include elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the statement "comprising a ..." do not exclude the presence of other identical elements in the process, method, article or equipment comprising the elements. The term "two or more" includes two or more than two cases.

[0046] See also Figure 1 , which is a schematic flow chart of a method for testing the impact resistance of a power battery provided in an embodiment of the present application. The method for testing the impact resistance of a power battery provided in the present application is applied to a falling ball impact test device. The method may specifically include:

[0047] S110. Based on the size of the power battery and the preset test standard, configure the ball head and drop ball height parameters in the drop ball impact test device.

[0048] For example, considering the size differences of different power batteries, Figure 2As shown, the ball head 8 in the drop ball impact test device provided in this application uses a standard hardened steel ball head with a default diameter of 50 mm. It can also be replaced with a 30 mm or 80 mm ball head to accommodate power batteries of different sizes. The drop ball height parameter is controlled by electrically adjustable height brackets 1 on both sides of the drop ball impact test device, with an adjustment range of 0.5 m to 2 m, thereby meeting different preset test standards.

[0049] Therefore, when conducting impact resistance testing on power batteries, the appropriate ball head size and drop height must be determined based on the specific dimensions (length × width × height) of the power battery being tested and the pre-set test standard. For example, for a small power battery, a 30mm diameter ball head may be selected to more accurately test its impact resistance. If the pre-set test standard requires a higher impact energy, the drop height needs to be adjusted to closer to 2m.

[0050] S120 , after calibrating the measurement module in the falling ball impact test device, release the ball head 8 based on the falling ball height parameter.

[0051] For example, before conducting a test using the drop ball impact test apparatus, its measurement modules (laser displacement sensor group 2, piezoelectric force sensor 4, high-speed camera unit 6) must be calibrated. After calibration, the electromagnetic release platform 9 in the drop ball impact module (electrically adjustable height bracket 1, vertical guide tube 7, ball head 8, electromagnetic release module) releases the ball head 8 according to the previously determined drop ball height parameters. The ball head 8 falls along the vertical guide tube 7, the inner wall of which is coated with a ceramic coating to reduce friction, and impacts the power battery.

[0052] S130. Collect data from the measurement module to obtain a first time curve and a second time curve, wherein the first time curve is used to represent a curve of how the dynamic impact force generated when the ball head impacts the power battery changes with time, and the second time curve is used to represent a curve of how the deformation of the surface of the power battery changes with time under the impact of the ball head.

[0053] Exemplarily, the measurement module includes a laser displacement sensor group 2, a high-speed camera unit 6, and a piezoelectric force sensor 4, as well as piezoelectric force sensors 4 mounted on both sides of the center of the flat plate supporting the impact platform 3 at the four corners. When the ball head 8 is released by the electromagnetic release module and strikes the power battery, the electromagnetic switch is triggered and signal acquisition is started. The piezoelectric force sensor 4 measures the impact force of the falling ball head 8 in real time, thereby obtaining a first time curve of the dynamic impact force generated when the ball head strikes the power battery over time; two laser displacement sensor groups 2 arranged at a 45° angle measure the penetration depth of the power battery surface in real time, and combined with the high-speed camera unit 6 to analyze the surface strain field using a digital image correlation algorithm, together obtain a second time curve of the deformation variable of the power battery surface under the impact of the ball head over time.

[0054] S140: Obtain a test result of the impact resistance performance of the power battery based on the first time curve and the second time curve.

[0055] For example, a Kalman filter is used to reduce noise, and a sliding window peak detection algorithm is used to identify the first maximum point in the first time curve as the dynamic maximum penetration depth. The displacement within 1 second after the impact is extracted as the static penetration depth, and the energy absorption rate is then calculated through integration. Combining these parameters allows a comprehensive assessment of the power battery's impact resistance and the resulting test results.

[0056] In some examples, the measurement module includes a high-speed camera unit 6, a piezoelectric force sensor 4, and a laser displacement sensor group 2. Calibration of the measurement module in the falling ball impact test apparatus includes:

[0057] Using a checkerboard calibration plate to perform lens distortion calibration and spatial resolution calibration on the high-speed camera unit 6;

[0058] Performing linearity calibration on the piezoelectric force sensor 4 using a preset standard weight;

[0059] Based on the results of the linearity calibration, position alignment calibration is performed on two groups of laser displacement sensors.

[0060] For example, in order to ensure that the images captured by the high-speed camera unit 6 can accurately analyze the surface strain field of the power battery, it is necessary to use a checkerboard calibration plate to correct the lens distortion and calibrate the spatial resolution. The high-speed camera is fixed to the rear side of the platform, and the lens angle of view covers the ±20mm area of ​​the impact point. Only after calibration can the accuracy of the surface strain field analysis by the digital image correlation algorithm be guaranteed. Then, the piezoelectric force sensor 4 installed on both sides of the center of the flat plate supporting the impact platform 3 at the four corners is calibrated using preset standard weights. This is because the piezoelectric force sensor 4 is used to measure the impact force of the falling ball head 8 in real time. Only by ensuring its linearity is accurate can the impact force be accurately measured to provide reliable data for subsequent analysis.

[0061] Furthermore, the coordinated calibration of the various sensors is crucial during the calibration of the entire drop-ball impact test apparatus. Laser displacement sensor group 2, consisting of two sensors arranged at a 45-degree angle, is used to measure the depth of intrusion into the power battery surface in real time. Based on the linearity calibration results of piezoelectric force sensor 4, position alignment calibration of laser displacement sensor group 2 ensures measurement accuracy and synchronizes and accurately collects data with other sensors.

[0062] In some examples, the falling ball impact test apparatus includes an electromagnetic release module that collects data from the measurement module, including:

[0063] Obtaining a pulse signal from an electromagnetic release module;

[0064] The pulse signal is used to trigger the measurement module to collect data.

[0065] For example, an electromagnetic release module is installed at the end of the falling ball impact module in the falling ball impact test device. When the switch on the electromagnetic release platform 9 releases the ball head 8, the electromagnetic release module generates a pulse signal. This pulse signal is the trigger signal for the entire data collection process, indicating that the ball head 8 has begun to fall and is about to impact the power battery.

[0066] Furthermore, a hardware trigger circuit based on a field-programmable gate array (FPGA) ensures that the timing errors of various sensors, high-speed cameras, and the ball release are reduced. When a pulse signal is obtained from the electromagnetic release module, it triggers the measurement module (including the laser displacement sensor group 2, the high-speed camera unit 6, and the piezoelectric force sensor 4) to simultaneously begin data acquisition. This ensures that the collected data is precisely synchronized with the moment of ball head impact, thereby accurately recording various data during the process of the ball head impacting the power battery.

[0067] In some examples, obtaining a test result of the impact resistance performance of the power battery based on the first time curve and the second time curve includes:

[0068] Perform sliding window peak detection on the first time curve and extract the first maximum point as the dynamic maximum intrusion depth;

[0069] Based on the displacement data of the ball head 8 in a preset time period after the impact, the static invasion depth is obtained;

[0070] The first time curve is combined with the second time curve by an integral operation to obtain the energy absorption rate;

[0071] Based on the dynamic maximum intrusion depth, static intrusion depth and energy absorption rate, the test results of the power battery's impact resistance are obtained.

[0072] Exemplarily, a sliding window peak detection algorithm is used to process the first time curve, identifying the first maximum point of the first time curve as the dynamic maximum penetration depth. By performing sliding window peak detection on the first time curve (a curve showing the dynamic impact force generated when the ball head 8 impacts the power battery over time), the first maximum point corresponding to the moment of impact can be extracted and used as the dynamic maximum penetration depth. This parameter reflects the maximum deformation of the power battery at the moment of impact.

[0073] The displacement within 1 second after the impact is used as the static penetration depth (post-impact stable value). After obtaining the second time curve (a curve showing the deformation of the power battery surface under the impact of the ball head over time), the displacement data within 1 second after the impact of the ball head 8 is extracted. After data processing and analysis, the static penetration depth is calculated. This parameter reflects the deformation of the power battery in the stable state after the impact.

[0074] The first time curve reflects the change in impact force over time, while the second time curve reflects the change in deformation over time. By integrating these two curves, the impact force and deformation are calculated in the time dimension to obtain the energy absorption rate. This parameter measures the power battery's ability to absorb energy during impact resistance.

[0075] The combined use of three key parameters—dynamic maximum penetration depth, static penetration depth, and energy absorption rate—can comprehensively assess the impact resistance of power batteries. The dynamic maximum penetration depth reflects the maximum deformation at the moment of impact, the static penetration depth reflects the stable deformation after impact, and the energy absorption rate measures the battery's ability to absorb energy. This comprehensive analysis of these parameters ultimately yields the test results for power battery impact resistance.

[0076] In some examples, based on the dynamic maximum penetration depth, the static penetration depth, and the energy absorption rate, test results of the power battery impact performance are obtained, including:

[0077] Comparing the preset dynamic safety threshold and the preset static intrusion safety threshold with the dynamic maximum intrusion depth and the static intrusion depth respectively to obtain a first comparison result, and determining whether the deformation of the power battery exceeds a safety range based on the first comparison result;

[0078] Comparing a preset energy absorption rate threshold with the energy absorption rate to obtain a second comparison result, and judging whether the energy dissipation capacity of the power battery meets the impact resistance requirement based on the second comparison result;

[0079] If the deformation of the power battery exceeds the safe range, or the energy dissipation capacity of the power battery does not meet the impact resistance requirements, the test result of the power battery impact performance is judged to be unqualified;

[0080] If the deformation of the power battery does not exceed the safety range and the energy dissipation capacity of the power battery meets the impact resistance requirements, the test result of the power battery impact performance is judged to be qualified.

[0081] For example, in actual applications, dynamic and static intrusion safety thresholds are pre-set based on the design requirements and safety standards of the power battery. The dynamic maximum intrusion depth obtained through data processing is compared with the pre-set dynamic safety threshold, and the static intrusion depth is compared with the pre-set static intrusion safety threshold to obtain a first comparison result. If the dynamic maximum intrusion depth exceeds the dynamic safety threshold, or the static intrusion depth exceeds the static intrusion safety threshold, it indicates that the deformation of the power battery during the impact has exceeded the safe range.

[0082] Similarly, a preset energy absorption rate threshold is used to measure whether the power battery's energy dissipation capacity meets the impact resistance requirements. The calculated energy absorption rate is compared with the preset energy absorption rate threshold to obtain a second comparison result. If the energy absorption rate is lower than the preset energy absorption rate threshold, it indicates that the power battery's energy dissipation capacity is insufficient and does not meet the impact resistance requirements.

[0083] As long as the deformation of the power battery exceeds the safe range, or the energy dissipation capacity does not meet the impact resistance requirements, it means that the power battery has problems in impact resistance and cannot meet the design and safety standards. Therefore, the test result of its impact performance is judged to be unqualified.

[0084] When the deformation of the power battery is within a safe range and the energy dissipation capacity meets the impact resistance requirements, it means that the power battery performs well in impact resistance and can meet the design and safety standards, so the test result of its impact performance is judged to be qualified.

[0085] In some examples, the ball drop height parameter includes the ball drop height range of the ball head 8 and the friction coefficient of the vertical guide tube 7 in the ball drop impact test device.

[0086] Exemplarily, the height of the falling ball is controlled by the electrically adjustable height brackets 1 on both sides, and the range is 0.5m-2m. Different falling ball heights will produce different impact energies, thereby affecting the test results of the impact resistance of the power battery. At the same time, the inner wall of the vertical guide tube 7 is plated with a ceramic coating to reduce friction, which shows that the friction coefficient of the vertical guide tube 7 is an important parameter. The friction coefficient will affect the falling speed and impact force of the ball head 8. If the friction coefficient is too large, the ball head 8 will lose power due to friction with the vertical guide tube 7 when it falls, resulting in the actual impact energy being inconsistent with expectations. Therefore, the falling ball height parameter includes not only the falling ball height range of the ball head 8, but also the friction coefficient of the vertical guide tube 7. These two factors need to be considered comprehensively during the test process to ensure the accuracy of the test results.

[0087] In summary, the present application provides a method for testing the impact resistance of power batteries. It adopts a composite measurement strategy, which complements laser displacement sensors (high sampling rate) with high-speed vision (full-field strain) to solve the limitations of a single sensor in dynamic impact. Multi-sensor redundancy + algorithm cross-validation synchronously outputs four-dimensional data of displacement, force, energy, and deformation field to support battery failure mode analysis. Secondly, the falling ball impact test device designed in this application has a simple structure and strong engineering applicability. It is compatible with various types such as metal casings, soft packs, and solid-state batteries. It can be adjusted to adapt to power batteries of various sizes, without the need to customize corresponding tooling according to the size of the power battery.

[0088] It should be noted that the above embodiments are only the best examples and are not intended to limit the implementation of the present application.

[0089] Furthermore, the present application also proposes a test device for the impact resistance of a power battery, which is applied to any of the above embodiments of the test method for the impact resistance of a power battery, specifically as follows: Figure 3 FIG. 1 is a functional module diagram of a device for testing the impact resistance of a power battery proposed in this application, and the device includes:

[0090] A parameter configuration module 21 is used to configure the ball head and drop ball height parameters in the drop ball impact test device based on the size of the power battery and the preset test standard;

[0091] The measurement and calibration module 22 is used to calibrate the measurement module in the falling ball impact test device and release the ball head based on the falling ball height parameter;

[0092] The data acquisition module 23 is configured to acquire data from the measurement module to obtain a first time curve and a second time curve, wherein the first time curve is used to represent a curve showing how the dynamic impact force generated when the ball head impacts the power battery changes over time, and the second time curve is used to represent a curve showing how the deformation of the power battery surface changes over time under the impact of the ball head;

[0093] The result testing module 24 is configured to obtain a test result of the impact resistance performance of the power battery based on the first time curve and the second time curve.

[0094] like Figure 4 As shown, an embodiment of the present application also provides an electronic device 300, including a processor 310, a memory 320, and a computer program 321 stored in the memory 320 and executable on the processor. When the processor 310 executes the computer program 321, the steps of any of the above-mentioned methods for testing the impact resistance of a power battery are implemented.

[0095] Since the electronic device introduced in this embodiment is a device used to implement a method for testing the impact resistance of a power battery in the embodiment of this application, based on the method introduced in the embodiment of this application, technical personnel in this field can understand the specific implementation of the electronic device of this embodiment and its various variations. Therefore, how the electronic device implements the method in the embodiment of this application will not be introduced in detail here. As long as the equipment used by technical personnel in this field to implement the method in the embodiment of this application falls within the scope of protection of this application.

[0096] In the specific implementation process, the computer program 321 can be implemented when executed by the processor Figure 1 Any implementation manner in the corresponding embodiments.

[0097] It should be noted that, in the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0098] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-readable program code.

[0099] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0100] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0101] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0102] The present application also provides a falling ball impact test device, such as Figure 2 As shown, the device includes a ball head 8, a measurement module, and the aforementioned electronic equipment. The measurement module includes a laser displacement sensor group 2, a piezoelectric force sensor 4, and a high-speed camera unit 6. Furthermore, the drop ball impact test apparatus also includes a drop ball impact module and an adjustable fixture 5. The drop ball impact module includes an electrically adjustable height bracket 1, a vertical guide tube 7, a ball head 8, and an electromagnetic release module. The electromagnetic release module is equipped with an electromagnetic release platform 9. The piezoelectric force sensor 4 is mounted on the impact platform 3 supported by four corner bases.

[0103] An embodiment of the present application also provides a computer program product, which includes computer software instructions. When the computer software instructions are executed on a processing device, the processing device executes the process of a method for testing the impact resistance performance of a power battery.

[0104] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a server or data center that includes one or more available media integrated. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state drive (SSD)).

[0105] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0106] In the several embodiments provided in this application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0107] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0108] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0109] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0110] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application 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. However, 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 embodiments of the present application.

[0111] Although the preferred embodiments of this specification have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of this specification.

[0112] Obviously, those skilled in the art may make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if such changes and modifications fall within the scope of the claims of this specification and their equivalents, this specification is intended to include such changes and modifications.

Claims

1. A method for testing the impact resistance of a power battery, characterized in that: Applied to a falling ball impact test device, the method comprises: Configure the ball head and drop height parameters in the drop ball impact test device based on the size of the power battery and the preset test standards; After calibrating the measurement module in the falling ball impact test device, releasing the ball head based on the falling ball height parameter; performing data acquisition on the measurement module to obtain a first time curve and a second time curve, wherein the first time curve is used to represent a curve of a dynamic impact force generated when the ball head impacts the power battery over time, and the second time curve is used to represent a curve of a deformation amount of the surface of the power battery under the impact of the ball head over time; A test result of the impact resistance performance of the power battery is obtained based on the first time curve and the second time curve.

2. The method for testing the impact resistance of a power battery according to claim 1, characterized in that: The measuring module includes a high-speed camera unit, a piezoelectric force sensor, and a laser displacement sensor group. The calibrating the measuring module in the falling ball impact test device includes: Performing lens distortion calibration and spatial resolution calibration on the high-speed camera unit using a checkerboard calibration plate; Performing linearity calibration on the piezoelectric force sensor using a preset standard weight; A position alignment calibration is performed on the laser displacement sensor group based on a result of the linearity calibration.

3. The method for testing the impact resistance of a power battery according to claim 1, characterized in that: The falling ball impact test device includes an electromagnetic release module, and the data collection of the measurement module includes: Acquire a pulse signal from the electromagnetic release module; The pulse signal is used to trigger data collection on the measurement module.

4. The method for testing the impact resistance of a power battery according to claim 1, wherein: The obtaining, based on the first time curve and the second time curve, a test result of the impact resistance performance of the power battery includes: Performing sliding window peak detection on the first time curve, and extracting the first maximum point as the dynamic maximum intrusion depth; Obtaining a static penetration depth based on displacement data of the ball head during a preset time period after impact; Combining the first time curve and the second time curve by an integral operation to obtain an energy absorption rate; Based on the dynamic maximum intrusion depth, the static intrusion depth and the energy absorption rate, a test result of the impact resistance performance of the power battery is obtained.

5. The method for testing the impact resistance of a power battery according to claim 4, characterized in that: The obtaining of a test result of the impact performance of the power battery based on the dynamic maximum penetration depth, the static penetration depth, and the energy absorption rate includes: Comparing a preset dynamic safety threshold and a preset static intrusion safety threshold with the dynamic maximum intrusion depth and the static intrusion depth, respectively, to obtain a first comparison result, and determining whether the deformation of the power battery exceeds a safety range based on the first comparison result; Comparing a preset energy absorption rate threshold with the energy absorption rate to obtain a second comparison result, and determining whether the energy dissipation capacity of the power battery meets the impact resistance requirement based on the second comparison result; If the deformation of the power battery exceeds the safety range, or the energy dissipation capacity of the power battery does not meet the impact resistance requirement, the impact performance test result of the power battery is determined to be unqualified; If the deformation of the power battery does not exceed the safety range and the energy dissipation capacity of the power battery meets the impact resistance requirement, the test result of the impact performance of the power battery is determined to be qualified.

6. The method for testing the impact resistance of a power battery according to claim 1, characterized in that: The falling ball height parameters include the falling ball height range of the ball head and the friction coefficient of the vertical guide tube in the falling ball impact test device.

7. A device for testing the impact resistance of a power battery, applied to the method for testing the impact resistance of a power battery according to any one of claims 1 to 6, characterized in that: The device comprises: A parameter configuration module is used to configure the ball head and drop ball height parameters in the drop ball impact test device based on the size of the power battery and the preset test standard; a measurement calibration module, configured to release the ball head based on the falling ball height parameter after calibrating the measurement module in the falling ball impact test device; a data acquisition module, configured to acquire data from the measurement module to obtain a first time curve and a second time curve, wherein the first time curve is a curve representing a change in the dynamic impact force generated when the ball head impacts the power battery over time, and the second time curve is a curve representing a change in the deformation of the surface of the power battery under the impact of the ball head over time; A result testing module is used to obtain a test result of the impact resistance performance of the power battery based on the first time curve and the second time curve.

8. An electronic device comprising: A memory and a processor, characterized in that the processor is used to implement the steps of the method for testing the impact resistance of a power battery as described in any one of claims 1 to 6 when executing a computer program stored in the memory.

9. A falling ball impact test device, characterized in that: The device comprises a ball head, a measuring module and the electronic device according to claim 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for testing the impact resistance of a power battery according to any one of claims 1 to 6 are implemented.

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